CN220186862U - Boiler flue gas waste heat recovery utilizes system - Google Patents
Boiler flue gas waste heat recovery utilizes system Download PDFInfo
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- CN220186862U CN220186862U CN202221723371.9U CN202221723371U CN220186862U CN 220186862 U CN220186862 U CN 220186862U CN 202221723371 U CN202221723371 U CN 202221723371U CN 220186862 U CN220186862 U CN 220186862U
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Abstract
A boiler flue gas waste heat recycling system. The boiler flue gas waste heat recovery utilizes system includes: boiler, air preheater, flue heat exchanger, desulfurizing tower, spray tower, chimney, forced draught blower, and absorption heat pump. The system can realize the efficient recovery and the efficient utilization of the waste heat of the flue gas and the cooperative removal of pollutants.
Description
Technical Field
The utility model relates to a boiler flue gas waste heat recycling system.
Background
In a conventional boiler system, fuel is combusted by a boiler to form flue gas which is discharged out of a hearth, and the flue gas is discharged into the atmosphere through a chimney after passing through an air preheater, a dust remover, an induced draft fan and a desulfurizing tower in sequence. The saturated flue gas at the outlet of the desulfurizing tower has a large amount of heat energy, and the saturated flue gas discharged into the atmosphere not only can cause a large amount of heat energy waste, but also can cause environmental pollution. The saturated flue gas temperature at the outlet of the desulfurizing tower is lower, the heat energy quality is lower, the recovery efficiency is lower, and the recovered heat energy utilization value and the utilization efficiency are lower because the heat energy quality is low.
Disclosure of Invention
In order to solve the above problems, the present utility model provides a boiler flue gas waste heat recovery and utilization system, comprising: the system comprises a boiler, an air preheater, a flue heat exchanger, a desulfurizing tower, a spray tower, a chimney, a blower and an absorption heat pump; wherein,
the boiler is provided with a fuel inlet, a boiler air supply inlet and a boiler flue gas outlet;
the air preheater is provided with an air preheater flue gas inlet, an air preheater flue gas outlet, an air preheater air supply inlet and an air preheater air supply outlet;
the flue heat exchanger is provided with a flue heat exchanger smoke inlet, a flue heat exchanger smoke outlet, a flue heat exchanger working medium water inlet and a flue heat exchanger working medium water outlet; the flue heat exchanger is a dividing wall type heat exchanger;
the desulfurizing tower includes: a desulfurizing tower body and a slurry circulating pump; a slurry pond is arranged at the bottom of the desulfurizing tower body; the lower part of the desulfurizing tower body is provided with a desulfurizing tower flue gas inlet, and the upper part of the desulfurizing tower body is provided with a desulfurizing tower flue gas outlet; a desulfurizing tower spraying device is arranged between the desulfurizing tower flue gas inlet and the desulfurizing tower flue gas outlet, the desulfurizing tower spraying device is directly or indirectly communicated with the slurry circulating pump, and the slurry circulating pump is directly or indirectly communicated with the slurry pool; optionally, a desulfurizing tower demister is arranged between the desulfurizing tower spraying device and the desulfurizing tower flue gas outlet;
The spray tower comprises a spray tower body; the spray tower body is provided with a spray tower smoke inlet, a spray tower smoke outlet, a spray tower heating medium water inlet and a spray tower heating medium water outlet; a spray tower water receiving device is arranged at the bottom of the spray tower body; a spray tower water distribution device for heating medium water is arranged between the spray tower flue gas inlet and the spray tower flue gas outlet; the spray tower water distribution device is directly or indirectly communicated with the spray tower heat medium water inlet, and the spray tower water receiving device is directly or indirectly communicated with the spray tower heat medium water outlet; optionally, the spray tower water distribution device is a water distribution tank or a water distribution pipe or a spray device;
the blower is provided with a blower inlet and a blower outlet; the air supply inlet of the air blower is directly or indirectly communicated with the atmosphere; the air supply outlet of the blower is directly or indirectly communicated with the air supply inlet of the air preheater; the air preheater air supply outlet is directly or indirectly communicated with the boiler air supply inlet;
the boiler flue gas outlet is directly or indirectly communicated with the air preheater flue gas inlet; the flue gas outlet of the air preheater is directly or indirectly communicated with the flue gas inlet of the flue heat exchanger, the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower, the flue gas outlet of the desulfurizing tower is directly or indirectly communicated with the flue gas inlet of the spraying tower, and the flue gas outlet of the spraying tower is directly or indirectly communicated with the chimney;
The absorption heat pump comprises an evaporator, an absorber, a generator and a condenser, wherein the evaporator is provided with an evaporator low-temperature heat source inlet, an evaporator low-temperature heat source outlet, an evaporator refrigerant water inlet and an evaporator refrigerant water vapor outlet; the absorber is provided with an absorber cold water inlet, an absorber cold water outlet, an absorber refrigerant water vapor inlet, an absorber concentrated absorbent solution inlet and an absorber diluted absorbent solution outlet; the generator is provided with a generator high-temperature heat source inlet, a generator high-temperature heat source outlet, a generator dilute absorbent solution inlet, a generator concentrated absorbent solution outlet and a generator refrigerant water vapor outlet; the condenser is provided with a condenser cooling water inlet, a condenser cooling water outlet, a condenser refrigerant water vapor inlet and a condenser refrigerant water outlet;
the evaporator refrigerant water inlet is in direct or indirect communication with the condenser refrigerant water outlet; the evaporator refrigerant vapor outlet is in direct or indirect communication with the absorber refrigerant vapor inlet; the absorber concentrated absorbent solution inlet is directly or indirectly communicated with the generator concentrated absorbent solution outlet; the absorber lean absorbent solution outlet is directly or indirectly communicated with the generator lean absorbent solution inlet; the generator refrigerant water vapor outlet is directly or indirectly communicated with the condenser refrigerant water vapor inlet;
The absorber cold water outlet is directly or indirectly communicated with the condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump, namely a heat-increasing type absorption heat pump;
the spray tower heating medium water outlet is directly or indirectly communicated with the evaporator low-temperature heat source inlet; the low-temperature heat source outlet of the evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the working medium water outlet of the flue heat exchanger is directly or indirectly communicated with the high-temperature heat source inlet of the generator; the high-temperature heat source outlet of the generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger;
optionally, a dust remover or/and a draught fan are connected in series at the flue gas inlet of the flue heat exchanger or the flue gas outlet of the flue heat exchanger;
optionally, the spray tower heating medium water inlet is also in direct or indirect communication with a raw water source device, and the spray tower heating medium water outlet is also in direct or indirect communication with a raw water user;
optionally, the flue heat exchanger comprises a first stage flue heat exchange module and a second stage flue heat exchange module which are connected in series; the first-stage flue heat exchange module is provided with a flue heat exchanger flue gas inlet, a first-stage flue heat exchange module flue gas outlet, a first-stage flue heat exchange module working medium water inlet and a flue heat exchanger working medium water outlet; the second-stage flue heat exchange module is provided with a second-stage flue heat exchange module flue gas inlet, a flue heat exchanger flue gas outlet, a flue heat exchanger working medium water inlet and a second-stage flue heat exchange module working medium water outlet; the flue gas outlet of the first-stage flue heat exchange module is directly or indirectly communicated with the flue gas inlet of the second-stage flue heat exchange module through a dust remover and/or an induced draft fan, and the working medium water outlet of the second-stage flue heat exchange module is directly or indirectly communicated with the working medium water inlet of the first-stage flue heat exchange module;
Optionally, a spray tower demister is arranged on a flue gas channel between the spray tower water distribution device and the chimney;
optionally, a heat medium water circulating pump is arranged on a heat medium water pipeline which is directly or indirectly communicated with the spray tower heat medium water outlet or the spray tower heat medium water inlet;
optionally, a high-temperature heat source water pump is arranged on the high-temperature heat source channel which is directly or indirectly communicated with the generator high-temperature heat source inlet or the generator high-temperature heat source outlet;
optionally, the flue heat exchanger working medium water outlet is also communicated with a heat user;
optionally, a cooling water reheater is connected in series with the condenser cooling water outlet;
optionally, the flue heat exchanger is a tubular heat exchanger or a heat pipe heat exchanger;
optionally, the flue heat exchanger is a series connection of a heat pipe heat exchanger and a tubular heat exchanger.
Optionally, a first desulfurizing tower is connected in series on the flue directly or indirectly communicated with the desulfurizing tower flue gas outlet or the desulfurizing tower flue gas outlet;
optionally, the flue heat exchanger working medium water outlet is directly or indirectly communicated with the generator high-temperature heat source inlet through a working medium water heater;
optionally, the high-temperature heat source outlet of the generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger through a cooler; optionally, the cooler is a generator of other absorption heat pumps or other air supply heaters;
Optionally, a cold water reheating device is connected in series on a cold water channel directly or indirectly communicated with the condenser cooling water outlet;
preferably, in the boiler flue gas waste heat recycling system, an air supply heater is also arranged; the air supply heater is provided with an air supply heater air supply inlet, an air supply heater air supply outlet, an air supply heater working medium water inlet and an air supply heater working medium water outlet; the air supply channel of the air supply heater is connected in series with an air channel which is directly or indirectly communicated with the air supply inlet of the air supply device or the air supply outlet of the air supply device; the air supply outlet of the air supply heater is directly or indirectly communicated with the air supply inlet of the air preheater; the air supply heater is a dividing wall type heat exchanger; the working medium water channel of the air supply heater is connected in series with the working medium water channel between the high-temperature heat source outlet of the generator and the working medium water inlet of the flue heat exchanger; the high-temperature heat source outlet of the generator is directly or indirectly communicated with the working medium water inlet of the air supply heater; and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger.
Preferably, in the boiler flue gas waste heat recycling system, a first air supply heater is further arranged; the first air supply heater is provided with a first air supply heater air supply inlet, a first air supply heater air supply outlet, a first air supply heater cold water inlet and a first air supply heater cold water outlet; the air supply channel of the first air supply heater is connected in series with an air channel which is directly or indirectly communicated with the air supply inlet of the air blower or the air supply outlet of the air blower; the air supply outlet of the first air supply heater is directly or indirectly communicated with the air supply inlet of the air preheater; preferably, when the air supply heater is provided, the air supply outlet of the first air supply heater is directly or indirectly communicated with the air supply inlet of the air supply heater; the first air supply heater cold water inlet is directly or indirectly communicated with the condenser cooling water outlet; the first air supply heater cold water outlet is directly or indirectly communicated with the absorber cold water inlet; the first air supply heater is a dividing wall type heat exchanger; optionally, a cold water pump is arranged on a cold water channel which is directly or indirectly communicated with the cold water inlet of the absorber or the cold water outlet of the condenser.
Preferably, in the boiler flue gas waste heat recycling system, a second air supply heater is further arranged; the second air supply heater is provided with a second air supply heater air supply inlet, a second air supply heater air supply outlet, a second air supply heater heating medium water inlet and a second air supply heater heating medium water outlet; the air supply channel of the second air supply heater is connected in series with the air channel which is directly or indirectly communicated with the air supply inlet of the air blower or the air supply outlet of the air blower; the air supply outlet of the second air supply heater is directly or indirectly communicated with the air supply inlet of the air preheater; preferably, when the first air supply heater is provided, the second air supply heater air supply outlet is directly or indirectly communicated with the first air supply heater air supply inlet; preferably, when the first air supply heater is not provided but the air supply heater is provided, the second air supply heater air supply outlet is directly or indirectly communicated with the air supply heater air supply inlet; the second air supply heater heating medium water inlet is directly or indirectly communicated with the spray tower heating medium water outlet; the second air supply heater heating medium water outlet is directly or indirectly communicated with the spray tower heating medium water inlet; the second air supply heater is a dividing wall type heat exchanger.
Preferably, in the boiler flue gas waste heat recycling system, a third air supply heater is connected in series on an air duct which is directly or indirectly communicated with the air supply inlet or the air supply outlet of the air supply device; a first flue heat exchanger is arranged between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the desulfurizing tower; the third air supply heater is provided with a third air supply heater air supply inlet, a third air supply heater air supply outlet, a third air supply heater working medium water inlet and a third air supply heater working medium water outlet; the third air supply heater air supply outlet is directly or indirectly communicated with the air preheater air supply inlet; the third air supply heater is a dividing wall type heat exchanger; the first flue heat exchanger is provided with a first flue heat exchanger smoke inlet, a first flue heat exchanger smoke outlet, a first flue heat exchanger working medium water inlet and a first flue heat exchanger working medium water outlet; the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the first flue heat exchanger; the flue gas outlet of the first flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower; the first flue heat exchanger is a dividing wall type heat exchanger; the working medium water inlet of the third air supply heater is directly or indirectly communicated with the working medium water outlet of the first flue heat exchanger; the working medium water outlet of the third air supply heater is directly or indirectly communicated with the working medium water inlet of the first flue heat exchanger; optionally, a dust remover or/and an induced draft fan are connected in series on a flue gas channel between the flue heat exchanger and the first flue heat exchanger; optionally, a third working medium water circulating water pump is arranged on the working medium water channel directly or indirectly communicated with the working medium water outlet of the third air supply heater or the working medium water inlet of the third air supply heater.
The relative positions of the third air supply heater, the first air supply heater and the second air supply heater are sequentially determined according to the respective hot side water medium temperatures, and the heater with the high hot side medium temperature is arranged at a position closer to the air supply inlet of the air preheater.
Preferably, in the boiler flue gas waste heat recycling system, a first absorption heat pump is further arranged; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump, namely a heat-increasing type absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the air supply heater, and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; or the first generator high-temperature heat source outlet is not communicated with the working medium water inlet of the air supply heater but is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
Preferably, in the boiler flue gas waste heat recycling system, the spray tower is arranged above the desulfurization tower, the desulfurization tower and the spray tower are connected through the liquid collecting device to form a desulfurization spray integrated structure, and the slurry pool, the desulfurization tower flue gas inlet, the desulfurization tower spray device, the liquid collecting device, the spray tower water distributing device and the spray tower flue gas outlet are sequentially arranged inside the desulfurization spray integrated structure from bottom to top; the liquid collecting device is of a multifunctional integrated structure and comprises a flue gas outlet of the desulfurizing tower, a flue gas inlet of the spraying tower and a water receiving device of the spraying tower, flue gas from the desulfurizing tower can enter the spraying tower through the liquid collecting device, and heat medium water from the spraying tower falls into the liquid collecting device to be collected and is guided out of the liquid collecting device through a heat medium water outlet of the spraying tower so as not to flow into the desulfurizing tower.
Preferably, in the boiler flue gas waste heat recycling system, the liquid collecting device is a liquid collecting and demisting integrated structure with a demisting function, and the liquid collecting and demisting integrated structure comprises a liquid collecting chassis, a gas lifting pipe and a gas lifting cap; the liquid collecting chassis is provided with a plurality of vent holes, the vent holes are correspondingly provided with the gas lifting pipes, the top ends of the gas lifting pipes are provided with gas lifting caps, and gas lifting channels for the circulation of flue gas are arranged on the gas lifting caps or between the gas lifting caps and the top ends of the gas lifting pipes or on the pipe walls of the upper sections of the gas lifting pipes; a guide vane or a cyclone is arranged in the gas lift pipe, or/and a demisting pipe is connected below the gas lift pipe or arranged in the gas lift pipe, and the guide vane or the cyclone is arranged in the demisting pipe; the gas lifting pipe and the demisting pipe are of a split structure or an integrated structure; the liquid collecting chassis is provided with a water retaining edge or is in sealing combination with the inner wall of the tower body of the desulfurization spraying integrated structure and takes the inner wall of the desulfurization spraying integrated structure as the water retaining edge, an upward opening space enclosed between the liquid collecting chassis and the water retaining edge is used as a spray tower water receiving device, and the spray tower water receiving device is directly or indirectly communicated with a spray tower heating medium water outlet.
In the boiler flue gas waste heat recycling system, the gas raising cap adopts a tower-type shutter structure, the outer diameter of the gas raising cap and the outer diameter of the gas raising pipe are smaller than or equal to the inner diameter of the vent hole on the liquid collecting chassis, and the gas raising pipe and the gas raising cap are arranged in a mode of being detached from the liquid collecting chassis.
Preferably, in the boiler flue gas waste heat recycling system, a packing layer is arranged between the liquid collecting device and the spraying tower water distributing device.
Preferably, the boiler flue gas waste heat recycling system is further provided with a steam turbine high-medium pressure cylinder, a steam turbine low-pressure cylinder, a condenser and a low-pressure heater; optionally, a deaerator and a high-pressure heater are also provided;
the steam turbine high-medium pressure cylinder is provided with a high-medium pressure cylinder steam inlet, a high-medium pressure cylinder steam outlet and a high-medium pressure cylinder steam extraction outlet;
the low-pressure cylinder of the steam turbine is provided with a low-pressure cylinder steam inlet, a low-pressure cylinder steam outlet and a low-pressure cylinder steam extraction outlet;
the condenser is provided with a condenser steam inlet and a condenser working medium water outlet;
the low-pressure heater is provided with a low-pressure heater working medium water inlet, a low-pressure heater working medium water outlet and a low-pressure heater steam extraction inlet;
The deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet;
the high-pressure heater is provided with a high-pressure heater working medium water inlet and a high-pressure heater working medium water outlet;
the boiler is also provided with a boiler steam outlet and a boiler working medium water inlet;
the boiler steam outlet is directly or indirectly communicated with the high-medium pressure cylinder steam inlet; the high-medium pressure cylinder steam outlet is directly or indirectly communicated with the low-pressure cylinder steam inlet; the low-pressure cylinder steam outlet is directly or indirectly communicated with the condenser steam inlet; the condenser working medium water outlet is simultaneously and directly communicated with the low-pressure heater working medium water inlet and the flue heat exchanger working medium water inlet or indirectly communicated with other equipment (such as a water pump, a heater and the like, a heat exchanger for heating working medium water and the like); the boiler working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet and the flue heat exchanger working medium water outlet at the same time; the low-pressure heater steam extraction inlet is directly or indirectly communicated with the low-pressure cylinder steam extraction outlet or/and the high-pressure cylinder steam extraction outlet;
optionally, a working medium water pump is arranged on a working medium water channel directly or indirectly communicated with the working medium water outlet of the condenser;
The low-pressure heater is one-stage or multi-stage low-pressure heater; the high-pressure heater is a one-stage or multi-stage high-pressure heater;
optionally, the boiler working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet through a high-pressure heater or/and a water feed pump and/or a deaerator;
optionally, the boiler working medium water inlet is directly or indirectly communicated with the flue heat exchanger working medium water outlet through a high-pressure heater or/and a water feeding pump and/or a deaerator;
optionally, the condenser working medium water outlet is directly or indirectly communicated with the low-pressure heater working medium water inlet and the flue heat exchanger working medium water inlet 22-3 through a first low-pressure heater; the first low-pressure heater is one-stage or multi-stage;
optionally, a heater or/and a working medium water pump or/and a buffer water tank are connected in series on a branch channel between the working medium water outlet of the condenser and the working medium water inlet of the flue heat exchanger;
optionally, a heater is connected in series between the flue heat exchanger working medium water outlet and the boiler working medium water inlet.
The absorption heat pump described herein is a circulation system that utilizes high-grade energy to drive the transfer of heat from low temperature to high temperature. The heat energy is used for driving operation, lithium bromide solution or other solution with strong water absorbability can be used as an absorbent, water can be used as a refrigerant, heat is extracted from a low-grade heat source, medium-temperature and high-temperature hot water or steam meeting the process or heating requirements is prepared, waste heat recycling is realized, and heat energy is conveyed from low temperature to high temperature.
The absorption heat pump of the present utility model may optionally include other conventional components of the absorption heat pump, such as auxiliary components of a heat exchanger suction device, a barrier pump (solution pump and refrigerant pump), etc., in addition to the components and configurations described above. The air extractor can extract non-condensable gases such as air in the unit and keep the unit in a high vacuum state all the time. The specific structure of other conventional components related to the absorption heat pump belongs to the conventional technology, and is not described herein.
The dividing wall type heat exchanger is also called a surface type heat exchanger, and refers to a heat exchanger that cold side medium and hot side medium are not in direct contact, but indirectly exchange heat through wall surfaces such as heat exchange tube walls or heat exchange plate walls, such as a tubular heat exchanger, a plate type heat exchanger, a heat tube type heat exchanger, a tubular heat tube hybrid heat exchanger and the like, wherein the heat exchange process of the heat tube type heat exchanger is that the hot side medium transfers heat to an intermediate medium in a heat tube through a heat tube hot section tube wall, and the intermediate medium transfers heat to the cold side medium through a heat tube cold section tube wall.
The blower herein refers to various blowers that supply oxygen required for combustion to the supply air in the boiler, such as blowers and/or primary blowers in a power plant.
A boiler as used herein refers to a device that burns fuel to give off heat and produce flue gas.
The steam turbine is generally used for driving a generator to generate electricity, and has the advantages of improving the working efficiency, improving the working capacity and reducing the energy consumption, namely reducing the electricity generation coal consumption and the power supply coal consumption.
Communication as described herein, including direct communication and indirect communication;
herein, optionally, means that it may be selected, e.g., with or without, being provided, in some way or not.
The sequential arrangement, sequential communication, etc. of the various devices or components described herein relate to sequential expressions, and do not exclude the case where other devices or components are disposed between two devices or components that are sequentially adjacent.
Description of the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the boiler flue gas waste heat recovery system of the present utility model.
Fig. 1-1 is a schematic structural diagram of another connection mode of a flue heat exchanger in the boiler flue gas waste heat recovery system of the present utility model.
Fig. 2 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
Fig. 3 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
Fig. 4 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
Fig. 5 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
Fig. 6 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
Fig. 7 is a schematic structural diagram of an embodiment of a desulfurizing tower and a spray tower in the boiler flue gas waste heat recovery and utilization system of the present utility model.
Fig. 8 is a schematic structural diagram of an embodiment of a liquid collecting device in the boiler flue gas waste heat recovery system of the present utility model.
Fig. 8a and 8b are schematic structural views of an embodiment of a guide vane.
Fig. 8-1 is a schematic view of another embodiment of a liquid collecting device.
Fig. 8-2 is a schematic view of another embodiment of a liquid collecting device.
Fig. 9 is a schematic view of another embodiment of a liquid collecting device.
Fig. 9-1 is a schematic structural view of an embodiment of an air cap of a liquid collecting device.
Fig. 10 is a schematic structural view of another embodiment of a desulfurizing tower and a spray tower in the boiler flue gas waste heat recovery and utilization system of the present utility model.
Fig. 11 and 11-1 are schematic structural views of another two embodiments of the boiler flue gas waste heat recovery system according to the present utility model.
Reference numerals illustrate:
1, a boiler;
1-1 boiler fuel inlet;
1-2 a boiler air supply inlet;
1-3 boiler flue gas outlets;
1-4 boiler steam outlets;
1-5 boiler working medium water inlets;
2 an air preheater;
2-1 an air preheater flue gas inlet;
2-2 an air preheater flue gas outlet;
2-3 air supply inlet of air preheater;
2-4 air supply outlets of the air preheater;
22 flue heat exchanger;
a flue gas inlet of a 22-1 flue heat exchanger;
a flue gas outlet of the 22-2 flue heat exchanger;
22-3 flue heat exchanger working medium water inlet;
22-4 flue heat exchanger working medium water outlet;
22a first stage flue heat exchange module;
22a) -2 a first stage flue heat exchange module flue gas outlet;
22a-3 working medium water inlet of the first-stage flue heat exchange module;
22b a second stage flue heat exchange module;
22b-1 a flue gas inlet of a second stage flue heat exchange module;
22b-4 working medium water outlet of the second-stage flue heat exchange module;
5 a first flue heat exchanger;
5-1 a flue gas inlet of a first flue heat exchanger;
5-2 a flue gas outlet of the first flue heat exchanger;
5-3 working medium water inlet of the first flue heat exchanger;
5-4 working medium water outlets of the first flue heat exchanger;
6 a desulfurizing tower;
6-1 tower body;
6-2 slurry circulation pump;
6-3 slurry tanks;
6-4 flue gas outlets of the desulfurizing tower;
6-5 flue gas inlets of the desulfurizing tower;
6-6, a desulfurizing tower spraying device;
6-7 desulfurizing tower demister;
7, a chimney;
8, an air blower;
8-1 blower inlet;
8-2 blower air outlet;
9, an air supply heater;
9-1 air supply inlet of air supply heater;
9-2 an air supply outlet of an air supply heater;
9-3 working medium water inlet of air supply heater;
9-4 working medium water outlets of the air supply heater;
12 spray tower
12-1 a flue gas inlet of a spray tower;
12-2 a flue gas outlet of the spray tower;
12-3 a spray tower heating medium water inlet;
12-4 a spray tower heating medium water outlet;
12-5 a spray tower water receiving device;
12-6 spraying tower water distribution device;
12-7 liquid collecting devices;
12-8 of a liquid collecting chassis;
12-9 liters of air pipes;
12-10 liters of air cap;
12-11 vent holes;
12-12 swirlers;
12-13 liter gas channels;
12-14 water blocking edges;
12-15 demisting pipes;
12-16 filler layers;
35 raw water source device;
36 raw water users;
60-dust remover;
61-induced draft fan;
80 a first supply air heater;
80-1 a first supply air heater supply air inlet;
80-2 a first supply air heater supply air outlet;
80-3 a first supply air heater cold water inlet;
80-4 a first supply air heater cold water outlet;
25 high-medium pressure cylinders of the steam turbine;
25-1 high and medium pressure cylinder steam inlet;
25-2 high and medium pressure cylinder steam outlet;
25-3 a steam extraction outlet of the high-medium pressure cylinder;
26, a low-pressure cylinder of a steam turbine;
26-1 low pressure cylinder steam inlet;
26-2 a low pressure cylinder steam outlet;
26-3 a low pressure cylinder steam extraction outlet;
27, a condenser;
27-1 condenser steam inlet;
27-2 working medium water outlets of the condenser;
28 low pressure heater;
28-1 working medium water inlet of low-pressure heater;
28-2 working medium water outlet of low-pressure heater;
28-3 a low pressure heater steam extraction inlet;
29 deaerator;
29-1 working medium water inlet of deaerator;
29-2 working medium water outlet of deaerator;
30 high pressure heater;
30-1 working medium water inlet of high-pressure heater;
30-2 working medium water outlet of high-pressure heater;
90-absorption heat pump;
91-an evaporator;
91-1 low temperature heat source inlet of evaporator;
91-2 low temperature heat source outlet of evaporator;
91-3 evaporator refrigerant water inlet;
91-4 evaporator refrigerant vapor outlet;
92-absorber;
92-1 absorber cold water inlet;
a 92-2 absorber cold water outlet;
92-3 absorber refrigerant vapor inlet;
92-4 absorber concentrated absorbent solution inlet;
92-5 absorber lean absorbent solution outlet;
93-generator;
93-1 generator high temperature heat source inlet;
93-2 generator high temperature heat source outlet;
93-3 generator lean absorbent solution inlet;
93-4 generator concentrated absorbent solution outlet;
93-5 generator refrigerant vapor outlet;
94-a condenser;
94-1 condenser cooling water inlet;
94-2 condenser cooling water outlet
94-3 condenser refrigerant vapor inlet;
94-4 condenser refrigerant water outlet;
a second supply air heater 100;
100-1 a second supply air heater supply air inlet;
100-2 a second air supply heater air supply outlet;
100-3 a second air supply heater heating medium water inlet;
100-4 a second air supply heater heating medium water outlet.
101 a third air supply heater;
101-1 a third air supply heater air supply inlet; 101-2 a third air supply heater air supply outlet; 101-3 a working medium water inlet of a third air supply heater; 101-4 working medium water outlet of a third air supply heater; 40-a first absorption heat pump;
41-a first evaporator;
41-1 a first evaporator low temperature heat source inlet; 41-2 a first evaporator low temperature heat source outlet; 41-3 a first evaporator refrigerant water inlet; 41-4 a first evaporator refrigerant vapor outlet; 42-a first absorber;
42-1 a first absorber cold water inlet;
42-2 a first absorber cold water outlet;
42-3 a first absorber refrigerant vapor inlet;
42-4 a first absorber concentrated absorbent solution inlet;
42-5 a first absorber lean absorbent solution outlet;
43-a first generator;
43-1 first generator high temperature heat source inlet;
43-2 a first generator high temperature heat source outlet;
43-3 first generator lean absorbent solution inlet;
43-4 first generator concentrated absorbent solution outlet;
43-5 a first generator refrigerant vapor outlet;
44-a first condenser;
44-1 a first condenser cooling water inlet;
44-2 first condenser cooling water outlet
44-3 a first condenser refrigerant vapor inlet;
44-4 first condenser refrigerant water outlet.
Detailed Description
Hereinafter, specific embodiments of the present utility model will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of an embodiment of the boiler flue gas waste heat recovery system of the present utility model.
As shown in fig. 1, the boiler flue gas waste heat recycling system includes: boiler 1, air preheater 2, flue heat exchanger 22, desulfurizing tower 6, spray tower 12, chimney 7, blower 8, and absorption heat pump 90; wherein,
the boiler 1 is provided with a fuel inlet 1-1, a boiler air supply inlet 1-2 and a boiler flue gas outlet 1-3;
the air preheater 2 is provided with an air preheater flue gas inlet 2-1, an air preheater flue gas outlet 2-2, an air preheater air supply inlet 2-3 and an air preheater air supply outlet 2-4;
The flue heat exchanger 22 is provided with a flue heat exchanger flue gas inlet 22-1, a flue heat exchanger flue gas outlet 22-2, a flue heat exchanger working medium water inlet 22-3 and a flue heat exchanger working medium water outlet 22-4;
the desulfurizing tower 6 includes: a desulfurizing tower body 6-1 and a slurry circulating pump 6-2; the bottom of the desulfurizing tower body 6-1 is provided with a slurry pool 6-3; the lower part of the desulfurizing tower body 6-1 is provided with a desulfurizing tower flue gas inlet 6-5, and the upper part of the desulfurizing tower body is provided with a desulfurizing tower flue gas outlet 6-4; a desulfurizing tower spraying device 6-6 is arranged between the desulfurizing tower flue gas inlet 6-5 and the desulfurizing tower flue gas outlet 6-4, the desulfurizing tower spraying device 6-6 is directly or indirectly communicated with the slurry circulating pump 6-2, and the slurry circulating pump 6-2 is directly or indirectly communicated with the slurry pool 6-3; optionally, a desulfurizing tower demister 6-7 is arranged between the desulfurizing tower spraying device 6-6 and the desulfurizing tower flue gas outlet 6-4;
the spray tower 12 is provided with a spray tower flue gas inlet 12-1, a spray tower flue gas outlet 12-2, a spray tower heat medium water inlet 12-3 and a spray tower heat medium water outlet 12-4. The bottom of the spray tower is provided with a spray tower water receiving device 12-5. A spray tower water distribution device 12-6 for heating medium water is arranged between the spray tower flue gas inlet 12-1 and the spray tower flue gas outlet 12-2. The spray tower water distribution device 12-6 is communicated with the spray tower heat medium water inlet 12-3, and the spray tower water receiving device 12-5 is communicated with the spray tower heat medium water outlet 12-4. And the heat medium water is scattered into the flue gas through the spray tower water distribution device 12-6, and the flue gas and the heat medium water are subjected to mixed heat exchange. The spray tower water distribution device 12-6 is a water distribution tank, a water distribution pipe, a spray device or the like, and can distribute the heat medium water into the flue gas. The spray tower water receiving device 12-5 may be a tower pool located at the lower part of the spray tower 12, or other structural forms, so long as the heat medium water flowing out from the water distribution device 12-6 can be collected.
The blower 8 is provided with a blower inlet 8-1 and a blower outlet 8-2; the blower air outlet 8-2 is directly or indirectly communicated with the air preheater air inlet 2-3; the air preheater air supply outlet 2-4 is directly or indirectly communicated with the boiler air supply inlet 1-2;
the boiler flue gas outlet 1-3 is directly or indirectly communicated with the air preheater flue gas inlet 2-1; the flue gas outlet 2-2 of the air preheater is directly or indirectly communicated with the flue gas inlet 22-1 of the flue heat exchanger, and the flue gas outlet 22-2 of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet 6-5 of the desulfurizing tower; the flue gas outlet 6-4 of the desulfurizing tower is directly or indirectly communicated with the flue gas inlet 12-1 of the spraying tower; the flue gas outlet 12-2 of the spray tower is directly or indirectly communicated with the chimney 7;
the absorption heat pump 90 comprises an evaporator 91, an absorber 92, a generator (also called a regenerator) 93 and a condenser 94, wherein the evaporator 91 is provided with an evaporator low-temperature heat source inlet 91-1, an evaporator low-temperature heat source outlet 91-2, an evaporator refrigerant water inlet 91-3 and an evaporator refrigerant water vapor outlet 91-4; the absorber 92 is provided with an absorber cold water inlet 92-1, an absorber cold water outlet 92-2, an absorber refrigerant water vapor inlet 92-3, an absorber concentrated absorbent inlet 92-4, and an absorber dilute absorbent outlet 92-5; the generator 93 is provided with a generator high-temperature heat source inlet 93-1, a generator high-temperature heat source outlet 93-2, a generator lean absorbent inlet 93-3, a generator rich absorbent outlet 93-4 and a generator refrigerant water vapor outlet 93-5; the condenser 94 is provided with a condenser cooling water inlet 94-1, a condenser cooling water outlet 94-2, a condenser refrigerant water vapor inlet 94-3, and a condenser refrigerant water outlet 94-4.
The evaporator refrigerant water inlet 91-3 communicates directly or indirectly with the condenser refrigerant water outlet 94-4; the evaporator refrigerant vapor outlet 91-4 communicates directly or indirectly with the absorber refrigerant vapor inlet 92-3; the absorber rich absorbent inlet 92-4 communicates directly or indirectly with the generator rich absorbent outlet 93-4; the absorber lean absorbent outlet 92-5 is in direct or indirect communication with the generator lean absorbent inlet 93-3; the generator refrigerant vapor outlet 93-5 communicates directly or indirectly with the condenser refrigerant vapor inlet 94-3.
The absorber cold water outlet 92-2 communicates directly or indirectly with the condenser cold water inlet 94-1; the absorption heat pump 90 constitutes a first type of absorption heat pump, i.e. a heat-increasing type of absorption heat pump;
the spray tower heating medium water outlet 12-4 is directly or indirectly communicated with the evaporator low temperature heat source inlet 91-1; the low-temperature heat source outlet 91-2 of the evaporator is directly or indirectly communicated with the spray tower heat medium water inlet 12-3; the flue heat exchanger working medium water outlet 22-4 is directly or indirectly communicated with the generator high-temperature heat source inlet 93-1; the high-temperature heat source outlet 93-2 of the generator is directly or indirectly communicated with the working medium water inlet 22-3 of the flue heat exchanger.
The working process is as follows:
fuel is fed into a hearth of the boiler 1 through a boiler fuel inlet 1-1, an air blower 8 feeds air into the hearth of the boiler 1 through an air preheater 2 and a boiler air supply inlet 1-2, heat is released by combustion of the fuel, and flue gas generated by combustion is discharged into the atmosphere after passing through a boiler flue gas outlet 1-3, the air preheater 2, a flue heat exchanger 22, a desulfurizing tower 6, a spray tower 12 and a chimney 7 in sequence.
The temperature of the flue gas is higher (generally about 300 ℃), and part of heat is transferred to the air supply in the air preheater 2, so that the air supply temperature is increased, the combustion efficiency of the boiler 1 can be improved, and the flue gas and smoke discharging loss can be reduced. However, in order to prevent the air preheater 2 from being corroded at a low temperature, the temperature of the exhaust gas at the outlet of the air preheater 2 should not be too low, and is generally set to about 120 ℃. For this purpose, a flue heat exchanger 22 is provided, and the flue gas flows out from the flue gas outlet 2-2 of the air preheater and then is communicated with or enters a flue gas channel of the flue heat exchanger 22 through a flue gas inlet 22-1 of the flue heat exchanger (such as a dust remover or/and an induced draft fan) to heat (including heating through a heat exchange pipe wall or a heat exchange plate wall, or heating through a heat exchange pipe wall or a heat exchange plate wall and an intermediate medium, etc.. The same applies hereinafter) working medium water flowing through a working medium water channel of the flue heat exchanger. When the flue heat exchanger 22 is a heat pipe heat exchanger (one of the partition wall heat exchangers), the heat exchange process is as follows: the flue gas flowing through the flue heat exchanger 22 flue gas channel transfers the heat of the flue gas to an intermediate medium, such as water, in the heat pipe through the heat pipe heat section pipe wall of the flue heat exchanger 22, the intermediate medium is heated and evaporated to be in a gaseous state under the vacuum condition in the heat pipe, and the gaseous intermediate medium in the heat pipe transfers the heat to the heat pipe cold section and transfers the heat to working medium water outside the heat pipe through the heat pipe cold section pipe wall. The flue gas is cooled and flows out of the flue gas outlet 22-2 of the flue heat exchanger, then directly or indirectly flows into the desulfurizing tower 6 through other equipment (such as a dust remover or/and a draught fan), and the desulfurized saturated or nearly saturated flue gas enters the spray tower 12 through the spray tower flue gas inlet 12-1. The heat medium water from the low-temperature heat source outlet 91-2 of the evaporator is conveyed to the spray tower water distribution device 12-6 through the spray tower heat medium water inlet 12-3, the spray tower water distribution device 12-6 distributes the heat medium water into the flue gas, the flue gas and the heat medium water are subjected to mixed heat exchange in the spray tower 12, the saturated flue gas is further cooled, dehumidified and washed, and then the saturated flue gas is discharged into the atmosphere through the spray tower flue gas outlet 12-2 and the chimney 7.
The sensible heat of the flue gas, the vaporization latent heat of the condensation of the water vapor and the temperature after the reaction heat in the desulfurization process are raised, and after the heat medium water is collected by the spray tower water receiving device 12-5, the heat medium water is directly or indirectly sent to the low-temperature heat source inlet 91-1 of the evaporator through the spray tower heat medium water outlet 12-4.
The heat medium water from the spray tower heat medium water outlet 12-4 enters the heat exchange tube in the evaporator 91 through the low temperature heat source inlet 91-1 of the evaporator, the evaporator 91 is in a low pressure (such as vacuum) state, the principle that the boiling point of water is low in the low pressure state is utilized, the refrigerant water conveyed by the condenser 94 absorbs the heat of the heat medium water in the heat exchange tube and then evaporates and cools the heat medium water, and meanwhile, the water vapor generated by evaporation enters the absorber 92. The cooled heat medium water flows out of the absorption heat pump 90 through the low-temperature heat source outlet 91-2 of the evaporator, returns to the heat medium water inlet 12-3 of the spray tower and enters the water distribution device 12-6 of the spray tower for recycling.
Cold water enters the heat transfer tubes of absorber 92 through absorber cold water inlet 92-1. In absorber 92, the strong water absorption of the lithium bromide concentrate (or other solution) is utilized to absorb water vapor from evaporator 91 from the concentrate from generator 93 and give off heat, raising the solution temperature, which may be higher than the heat medium water temperature from spray tower 12. When the solution contacts with the heat transfer pipe of the absorber 92, the cold water in the heat transfer pipe is heated to realize the heat transfer from the low-grade heat of the heat medium water of the spray tower to the cold water, the temperature of the cold water is increased, and the temperature of the cold water can be higher than the temperature of the heat medium water at the low-temperature heat source inlet 91-1 of the evaporator. And then flows out through the absorber cold water outlet 92-2 and then enters the condenser cooling water inlet 94-1, and meanwhile, the lithium bromide concentrated solution is changed into a dilute solution and then is conveyed to the generator 93.
The working medium water with higher temperature from the working medium water outlet 22-4 of the flue heat exchanger is used as a high-temperature driving heat source, enters the generator 93 through the generator high-temperature heat source inlet 93-1, the lithium bromide dilute solution in the generator 93 from the absorber 92 is heated and concentrated by the working medium water to be concentrated into a concentrated solution, then enters the absorber 92, the working medium water heats and concentrates the lithium bromide dilute solution and simultaneously generates refrigerant water vapor with higher temperature, and the refrigerant water vapor enters the condenser 94; after heat exchange and temperature reduction, the working medium water flows out of the absorption heat pump 90 through the high-temperature heat source outlet 93-2 of the generator and returns to the working medium water inlet 22-3 of the flue heat exchanger for recycling.
Cold water which is heated by the absorber 92 and is heated up from the absorber cold water outlet 92-2 is taken as cooling water, enters the condenser 94 through the condenser cooling water inlet 94-1, high-temperature refrigerant vapor from the generator 93 exchanges heat with the cooling water in the condenser 94 to release condensation latent heat and condense into refrigerant water, the cooling water absorbs heat and is heated up, and then flows out of the condenser 94 through the condenser cooling water outlet 94-2 and is sent to a hot user for use; the refrigerant water after the condensation of the refrigerant water vapor enters the evaporator 91 to be evaporated, thus circulating.
The above operation process realizes the heating of cold water passing through the absorber 92 and the condenser 94 in sequence, the heat quantity of cold water at the condenser cooling water outlet 94-2 is equal to the sum of the heat quantity input from the spray tower heating medium water outlet 12-4 through the evaporator low temperature heat source inlet 91-1 and the heat quantity input from the flue heat exchanger working medium water outlet 22-4 through the generator high temperature heat source inlet 93-1, and the heating medium water low temperature heat energy from the spray tower heating medium water outlet 12-4 is converted into heat energy with higher temperature. Thus forming a first type of absorption heat pump, namely a heat-increasing absorption heat pump. The cold water from the condenser cooling water outlet 94-2 may be sent to a hot user for use, such as external heating, heat supply, etc.
In general, the temperature of the working medium water from the flue heat exchanger 22 is about 120 ℃ (high-temperature driving heat source), the temperature of the heating medium water from the spray tower 12 is about 40 ℃ (low-temperature heat source), the temperature of cold water at the condenser cooling water outlet 94-2 of the absorption heat pump 90 can reach about 80 ℃, namely, the low-grade flue gas waste heat which is difficult to recycle after the desulfurization is recovered by utilizing the mixed heat exchange of the spray tower heating medium water and the flue gas, then the flue gas waste heat with higher temperature is recovered by utilizing the partition wall heat exchange of the flue heat exchanger and is used as the high-temperature driving heat source, the low-temperature heat of the heating medium water which is difficult to utilize from the spray tower is converted into the middle-temperature heat which is usable by utilizing the absorption heat pump and the high-temperature driving heat source, and the heat of the cold water at the condenser cooling water outlet 94-2 is equal to the sum of the heat of the working medium water heat from the flue heat exchanger and the heating medium water from the spray tower, so that the increase of the usable heat is realized. Compared with the conventional technology, the high-temperature driving heat source with higher use value is adopted, all heat of the embodiment is from the waste heat of the flue gas, the waste heat of the flue gas is recycled, and the economical efficiency is greatly improved.
And cooling the heat medium water by an evaporator, and then sending the cooled heat medium water to a spray tower to perform mixed heat exchange on the flue gas. The pollutants in the flue gas such as residual desulfurization slurry, sulfur dioxide, sulfur trioxide, fine dust (such as PM 2.5), heavy metals and the like can be further removed through the washing of the large flow and full coverage of the heat medium water; the temperature and the humidity of the flue gas are reduced, and the condensable particles in the flue gas are reduced; the fine mist droplets formed by condensing the water vapor in the flue gas are used as condensation nuclei, and other fine particles can be condensed by condensation to form large particles, so that the removal efficiency is improved; the humidity of the smoke is reduced, the local atmospheric environment can be improved, the possibility of forming aerosol and haze is reduced, and the smoke plume phenomenon of the chimney is further weakened, so that the purpose of whitening the chimney is realized.
In addition, part of water in the saturated flue gas is condensed and separated out, so that the effect of water recovery can be achieved, the part of water is condensed water without chloride ions, after the condensed water is recovered to a system, process water supplementing can be reduced, when the process water contains the chloride ions, the intake of the chloride ions can be reduced, and the treatment cost and the discharge of waste water are reduced, so that further energy and water conservation and discharge reduction of flue gas pollutants and water pollution are realized.
Because the flue gas at the outlet of the desulfurizing tower 6 is desulfurized and dedusted to reach a higher emission standard, the condensed water of the flue gas in the spray tower 12 has higher water quality, and can be sent to the outside of the system for use, and the water balance of the desulfurizing tower 6 is not influenced. In addition, as the saturated flue gas temperature at the outlet of the desulfurizing tower 6 is lower, near-zero end difference heat exchange can be realized by adopting mixed heat exchange, and the recovery amount of flue gas waste heat is increased.
The emission of pollutants is fundamentally reduced while the recovery and utilization efficiency of the waste heat of the flue gas is improved, and the emission of carbon dioxide is included, so that the realization of a carbon neutralization target is facilitated.
Therefore, the embodiment realizes the high-efficiency recovery and the high-efficiency utilization of the waste heat of the flue gas, and simultaneously realizes the water conservation, the deep emission reduction of the flue gas, the near zero emission and the treatment of the flue gas plume.
In a word, the low-temperature flue gas waste heat from the desulfurizing tower can be converted into heat energy with higher temperature through the spray tower and the absorption heat pump, so that the application range and the application efficiency of the desulfurizing tower are increased.
Optionally, a dust collector or/and an induced draft fan (not shown in the figure) is connected in series to the flue heat exchanger flue gas inlet 22-1 or the flue heat exchanger flue gas outlet 22-2. The flue heat exchanger may be connected in series at any position of the flue gas channel between the air preheater and the desulfurizing tower. The dust remover can remove part of dust in the flue gas; the induced draft fan is used for sucking the flue gas in the boiler furnace and sending the flue gas to a chimney.
Optionally, the spray tower heating medium water inlet 12-3 communicates directly or indirectly with raw water source means 35 and the spray tower heating medium water outlet communicates directly or indirectly with raw water user 36. Raw water from the raw water source device 35 enters the spray tower water distribution device 12-6 through the spray tower heat medium water inlet 12-3, the raw water is heated by utilizing flue gas of the spray tower, and the heated raw water is sent to the raw water user 36 through the spray tower heat medium water outlet 12-4 so as to fully utilize the flue gas waste heat and reduce the energy consumption.
Optionally, a spray tower demister (not shown in the figure) is arranged on a flue gas channel between the spray tower water distribution device 12-6 and the chimney 7. The purpose is to further purify the flue gas entering the chimney through a spray tower demister.
Optionally, a heat medium water circulating pump (not shown in the figure) is arranged on the heat medium water pipeline which is directly or indirectly communicated with the spray tower heat medium water outlet 12-4 or the spray tower heat medium water inlet 12-3. The purpose is to provide flowing power for the heat medium water through a heat medium water circulating pump.
Optionally, a high-temperature heat source water pump (not shown in the figure) is arranged on the high-temperature heat source channel which is directly or indirectly communicated with the generator high-temperature heat source inlet 93-1 or the generator high-temperature heat source outlet 93-2. The purpose is to provide flowing power for the high-temperature driving heat source through the high-temperature heat source water pump.
Optionally, the flue heat exchanger working fluid water outlet 22-4 is also in communication with a heat consumer (not shown). Working medium water at the working medium water outlet 22-4 of the flue heat exchanger is also provided for a heat user.
Optionally, the condenser cooling water outlet 94-2 is connected in series with a cooling water reheater (not shown). When the cold water temperature of the condenser cooling water outlet 94-2 cannot meet the heat user requirement, the cold water temperature of the condenser cooling water outlet 94-2 is heated by the cooling water reheater and then sent to the heat user.
Optionally, the flue heat exchanger 22 is a tubular heat exchanger or a heat pipe heat exchanger;
Optionally, the flue heat exchanger 22 is a series of a heat pipe heat exchanger and a tubular heat exchanger. The purpose is to arrange the heat pipe heat exchanger at the inlet of the flue heat exchanger 22, i.e. at the windward position of the flue gas flow direction. The leakage quantity of the heat pipe heat exchanger after abrasion leakage is only the water quantity in a single heat pipe, so that a large quantity of leakage is avoided, and large-area ash sticking and blocking are avoided.
Optionally, a first desulfurizing tower (not shown in the figure) is connected in series on a flue which is directly or indirectly communicated with the desulfurizing tower flue gas outlet 6-4 or the desulfurizing tower flue gas outlet 6-5. The purpose is to improve the desulfurization efficiency of the flue gas.
Optionally, the flue heat exchanger working fluid water outlet 22-4 communicates directly or indirectly (not shown) with the generator high temperature heat source inlet 93-1 through a working fluid water heater. When the temperature of the working medium water at the working medium water outlet 22-4 of the flue heat exchanger cannot meet the temperature requirement of the high-temperature driving heat source of the absorption heat pump 90, the working medium water at the working medium water outlet 22-4 of the flue heat exchanger is heated by a working medium water heater and then sent to the high-temperature heat source inlet 93-1 of the generator.
Optionally, the generator high temperature heat source outlet 93-2 communicates directly or indirectly (not shown) with the stack heat exchanger working fluid water inlet 22-3 via a cooler. Because the temperature of the working medium water at the high-temperature heat source outlet 93-2 of the generator is higher, the heat is further recovered through the cooler and then sent to the working medium water inlet 22-3 of the flue heat exchanger, so that the heat recovery efficiency can be improved; optionally, the cooler is a generator of other absorption heat pumps or other air supply heaters;
Optionally, a cold water reheater (not shown) is connected in series to the cold water channel in direct or indirect communication with the condenser cooling water outlet 94-2. When the cold water temperature of the condenser cooling water outlet 94-2 does not meet the user's requirements, it is heated by the cold water reheater and then sent to the user.
The number of the spray tower heating medium water outlets 12-4 can be one or more; the spray tower heating medium water inlet 12-3 may be one or more.
Fig. 1-1 is a schematic structural diagram of another connection mode of a flue heat exchanger in the boiler flue gas waste heat recovery system of the present utility model. As shown in fig. 1-1, unlike fig. 1, the flue heat exchanger 22 includes a first stage flue heat exchange module 22a and a second stage flue heat exchange module 22b connected in series; the first-stage flue heat exchange module 22a is provided with a flue heat exchanger flue gas inlet 22-1, a first-stage flue heat exchange module flue gas outlet 22a-2, a first-stage flue heat exchange module working medium water inlet 22a-3 and a flue heat exchanger working medium water outlet 22-4; the second-stage flue heat exchange module 22b is provided with a second-stage flue heat exchange module flue gas inlet 22b-1, a flue heat exchanger flue gas outlet 22-2, a flue heat exchanger working medium water inlet 22-3 and a second-stage flue heat exchange module working medium water outlet 22b-4; the flue gas outlet 22a-2 of the first-stage flue heat exchange module is directly or indirectly communicated with the flue gas inlet 22b-1 of the second-stage flue heat exchange module through a dust remover 60 or/and an induced draft fan 61, and the working medium water outlet 22b-4 of the second-stage flue heat exchange module is directly or indirectly communicated with the working medium water inlet 22a-3 of the first-stage flue heat exchange module.
The purpose of adopting the structure is mainly to match the relevant parameters of the flue heat exchanger with the parameters of the flue gas at the inlet of the dust remover. If the temperature of the working medium water at the working medium water inlet 22-3 of the flue heat exchanger is too low, the smoke temperature at the inlet of the dust remover 60 is too low, and the low-temperature corrosion of the dust remover is possibly caused; if the flue heat exchanger 22 recovers the waste heat of the flue gas, the low temperature corrosion of the dust remover can be caused when the flue heat exchanger outlet flue temperature is too low. In this case, the stack heat exchanger 22 is divided into a first stage stack heat exchange module 22a and a second stage stack heat exchange module 22b, and is disposed before and after the dust remover. The flue gas firstly passes through the first-stage flue heat exchange module 22a, then passes through a dust remover 60 or/and an induced draft fan 61, and then enters the second-stage flue heat exchange module 22b; the working medium water is heated by the second-stage flue heat exchange module 22b and then enters the first-stage flue heat exchange module 22a for continuous heating.
Fig. 2 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
As shown in fig. 2, on the basis of fig. 1 or 1-1 (the present embodiment is on the basis of fig. 1), the boiler flue gas waste heat recycling system is further provided with an air supply heater 9; the air supply heater 9 is provided with an air supply heater air supply inlet 9-1, an air supply heater air supply outlet 9-2, an air supply heater working medium water inlet 9-3 and an air supply heater working medium water outlet 9-4; the air supply channel of the air supply heater 9 is connected in series with an air channel between the air supply outlet 8-2 of the air supply machine and the air supply inlet 2-3 of the air preheater; the air supply inlet 9-1 of the air supply heater is directly or indirectly communicated with the air supply outlet 8-2 of the air supply machine; the air supply outlet 9-2 of the air supply heater is directly or indirectly communicated with the air supply inlet 2-3 of the air preheater; the air supply heater 9 is a dividing wall type heat exchanger; the working medium water channel of the air supply heater 9 is connected in series with the working medium water channel between the high-temperature heat source outlet 93-2 of the generator and the working medium water inlet 22-3 of the flue heat exchanger; the generator high-temperature heat source outlet 93-2 is directly or indirectly communicated with the working medium water inlet 9-3 of the air supply heater; the working medium water outlet 9-4 of the air supply heater is directly or indirectly communicated with the working medium water inlet 22-3 of the flue heat exchanger.
The working process is as follows:
working medium water from the flue heat exchanger 22 firstly enters the generator 93 as a high-temperature driving heat source to exchange heat and cool and then is sent to the air supply heater 9 to heat and supply air, and after exchanging heat and cooling with the air supply, the working medium water flows out of the air supply heater 9 and is sent back to the flue heat exchanger 22 for recycling; the air supply is heated by the air supply heater 9 and then sent into the air preheater 2.
In general, the temperature of the high-temperature driving heat source of the generator high-temperature heat source outlet 93-2 of the absorption heat pump 90 is higher, and the high-temperature driving heat source of the generator high-temperature heat source outlet 93-2 is sent to the air supply heater for heating and air supply, so that the heat energy can be fully utilized, and meanwhile, the flue gas temperature of the air preheater outlet and the water temperature of the working medium water of the flue heat exchanger working medium water outlet 22-4, namely the high-temperature heat source temperature of the generator high-temperature heat source inlet 93-1, can be improved, so that the efficiency of the absorption heat pump is further improved. The water temperature of the working medium water inlet 22-3 of the flue heat exchanger can be reduced, the flue gas waste heat can be fully recovered, and the heat exchanger area is reduced.
The following reasoning analysis may be tried to further illustrate the working principle of the invention: the absorption heat pump 90 adopts the structure of a first type of absorption heat pump, namely a heat-increasing absorption heat pump, and utilizes the working medium at the working medium water outlet 22-4 of the flue heat exchanger The water (which can be all or part of the working medium water outlet 22-4 of the flue heat exchanger, and the analysis is carried out according to the whole) is used as a high-temperature driving heat source to drive and absorb part of the heat medium water outlet 12-4 of the spray tower. Theoretically, the heat of the cold water at the condenser cooling water outlet 94-2 is set to be Q l The high-temperature driving heat source heat of working medium water from the flue heat exchanger and the low-temperature heat source heat of heat medium water from the spray tower are respectively set as Qg and Q d ，Q l The high-temperature driving heat source heat Qg of working medium water from the flue heat exchanger and the low-temperature heat source heat Q of heat medium water from the spray tower d The sum, i.e. Q l ＝Qg+Q d . The working medium water is delivered into the working medium water channel of the air supply heater 9 through the high temperature heat source outlet 93-2 of the generator and the working medium water inlet 9-3 of the air supply heater after the heat released by the working medium water is cooled, the air supply flowing through the air supply channel of the air supply heater 9 is heated, and the heat transferred to the air supply by the working medium water is set as Q f The working medium water releases heat and cools down, and returns to the working medium water inlet 22-3 of the flue heat exchanger through the working medium water outlet 9-4 of the air supply heater for recycling. Working medium water heat release amount from the working medium water outlet 22-4 of the flue heat exchanger is qg+Q f 。Q f After entering the air preheater 2 along with the air supply, part of the air enters the hearth, the boiler fuel is saved in an equivalent way, and the temperature of the flue gas outlet 2-2 of the air preheater is increased after part of the air enters the hearth. In general, less heat enters the hearth and can be ignored in calculation, so that the heat transferred to the air supply by the working medium water is equivalently converted into the smoke heat Q of the smoke outlet 2-2 of the air preheater f Q because the flue gas flow rate at the outlet of the air preheater 2 is unchanged without considering heat dissipation loss and other secondary factors f All this translates into an increase in flue gas temperature. The heat quantity of the flue gas transferred to the flue gas outlet 2-1 of the air preheater by the flue gas of the flue gas inlet 2-1 of the air preheater is set as Q O The flue gas heat of the flue gas outlet 2-2 of the air preheater is Q Y The flue gas heat Q of the flue gas outlet 2-2 of the air preheater Y ＝Q O +Q f . The heat exchange area of the flue heat exchanger is large enough, the heat exchange efficiency is 100%, the heat is converted into working medium water heat of the working medium water outlet 22-4 of the flue heat exchanger through the flue heat exchanger 22, and the heat is providedQz, qz=q Y ＝Q O +Q f ＝Qg+Q f Qg=q O The method comprises the following steps: the flue gas waste heat from the air preheater is equally converted into heat qg=q of a high-temperature driving heat source of the absorption heat pump 90 through the absorption heat pump 90, the air supply heater 9, the air preheater 2 and the flue heat exchanger 22 O At the same time, the flue gas heat of the flue gas outlet 2-2 of the air preheater is Q Y ＝Q O +Q f As the flow of the flue gas is unchanged, the temperature of the flue gas rises, the temperature of the working medium water at the working medium water outlet 22-4 of the flue heat exchanger rises, and the temperature of the high-temperature driving heat source sent to the high-temperature heat source 93-1 of the generator rises. According to the absorption heat pump principle, in a certain range, the temperature of a high-temperature driving heat source is increased, the efficiency of the absorption heat pump is improved, and more heat of a low-temperature heat source of heat medium water from a spray tower, namely Q, can be absorbed f Increase, high temperature drive heat source temperature rise, Q d Increase, Q l ＝Qg+Q d ，Qg＝Q O That is, the greater the heat exchange amount of the working fluid water at the working fluid water outlet 22-4 of the flue heat exchanger is allocated to the air supply heater 9, the higher the temperature of the high-temperature driving heat source of the absorption heat pump 90, the greater the low-temperature heat amount of the recovered heat fluid water from the spray tower, the higher the heat pump efficiency, and the greater the heat output from the condenser cooling water outlet 94-2 of the absorption heat pump 90. The quantitative analysis herein is to further illustrate the working principle of the present embodiment, and the influence of some secondary factors is omitted.
For the unit which needs to be provided with a heater for heating and air supply in order to prevent the cold end of the air preheater 2 from being corroded in winter, the air supply heater can replace the heater, and the flue gas waste heat is utilized to replace a steam heat source, so that the unit has a better energy-saving effect.
The system can be used for solving the problems of corrosion and blockage of the air preheater 2: the temperature of the exhaust gas of the air preheater 2 is increased, so that the risk of corrosion and blockage of the cold end of the air preheater 2 can be greatly reduced. At present, most boiler units are provided with a denitration system, when the boiler load is low and the flue gas temperature is low, the efficiency of the denitration system is reduced, the ammonia spraying amount is required to be increased, and excessive ammonia gas reacts with sulfide in the flue gas to generate ammonium bisulfate. As the temperature of the flue gas in the air preheater gradually decreases, ammonium bisulfate changes from a gas state to a nasal mucus state in the air preheater 2 to adhere to dust, and when the temperature is reduced below 147 ℃, the ammonium bisulfate solidifies and deposits on heat exchange elements of the air preheater 2 to form scale, thereby causing corrosion and blockage of the air preheater 2 and seriously affecting the operation of the air preheater. The system can raise the exhaust gas temperature of the air preheater 2 to be higher than the liquefaction temperature of ammonium bisulfate or even higher than the gasification temperature, and can effectively avoid the problems of corrosion and blockage of the air preheater 2 caused by ammonium bisulfate. The method can be used for improving the flexibility of the thermal power plant, reducing the load of the lowest stable unit and improving the peak shaving capacity.
Fig. 3 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
As shown in fig. 3, on the basis of fig. 1 or fig. 1-1 or fig. 2 (on the basis of fig. 2 in this embodiment), the boiler flue gas waste heat recycling system is further provided with a first air supply heater 80; the first air supply heater 80 is provided with a first air supply heater air supply inlet 80-1, a first air supply heater air supply outlet 80-2, a first air supply heater cold water inlet 80-3 and a first air supply heater cold water outlet 80-4; the air supply passage of the first air supply heater 80 is connected in series with the air passage through which the air supply inlet 8-1 or the air supply outlet 8-2 of the air supply is directly or indirectly connected, and the first air supply heater 80 is disposed between the air supply inlet 9-1 and the atmosphere when the air supply heater 9 (the air supply heater 9 is disposed in the present embodiment); the first air supply heater air supply inlet 80-1 is directly or indirectly communicated with the atmosphere; when the air supply heater 9 is arranged, the air supply outlet 80-2 of the first air supply heater is directly or indirectly communicated with the air supply inlet 9-1 of the air supply heater; when the air supply heater 9 is not arranged, the air supply outlet 80-2 of the first air supply heater is directly or indirectly communicated with the air supply inlet 2-3 of the air preheater; the first supply air heater cold water inlet 80-3 communicates directly or indirectly with the condenser cold water outlet 94-2; the first supply air heater cold water outlet 80-4 communicates directly or indirectly with the absorber cold water inlet 92-1; the first supply air heater 80 is a dividing wall type heat exchanger.
The working process is as follows:
the cold water from the condenser cooling water outlet 94-2 is sent to the first air supply heater cold water inlet 80-3 to enter the first air supply heater 80 cold water channel, and after the air is heated and flows through the first air supply heater 80 air supply channel, the air is sent back to the absorber cold water inlet 92-1 through the first air supply heater cold outlet 80-4, the low-temperature hot medium water from the spray tower is heated and sent to the first air supply heater 80 for heating and air supply through the first absorption heat pump 90, and then the high-temperature flue gas heat energy is converted through the first air supply heater 80 and the air preheater 2, and further the high-temperature flue gas heat energy is converted into the flue heat exchanger working medium water heat energy through the flue heat exchanger working medium water outlet 22-4, so that the heat energy can be supplied to a hot user for use, and the low-grade heat energy after desulfurization is recovered and converted into high-grade heat energy, and the flue gas waste heat recovery efficiency and the utilization efficiency are improved.
The following reasoning analysis may be tried to further illustrate the working principle of the invention: the absorption heat pump 90 adopts a structure of a first type of absorption heat pump, namely a heat-increasing absorption heat pump, and utilizes working medium water at the outlet of the working medium water outlet 22-4 of the flue heat exchanger as a high-temperature driving heat source to drive and absorb part of heat medium water heat at the heat medium water outlet 12-4 of the spray tower. Theoretically, the heat of the cold water at the condenser cooling water outlet 94-2 is set to be Q l The heat quantity of a high-temperature driving heat source of working medium water from a flue heat exchanger is Qg, and the heat quantity of a low-temperature heat source of heat medium water from a spray tower is Q d Heat Q of cold water at condenser cooling water outlet 94-2 l The high-temperature driving heat source heat Qg of working medium water from the flue heat exchanger and the low-temperature heat source heat Q of heat medium water from the spray tower d The sum, i.e. Q l ＝Qg+Q d . Cold water from the condenser cooling water outlet 94-2 is fed into the cold water passage of the air-supply heater 80 through the first air-supply heater heat medium water inlet 80-3 to heat the air supply flowing through the air-supply passage of the first air-supply heater 80, and the heat transferred from the cold water to the air supply is qg+q without considering heat dissipation loss and other secondary factors d This heat is supplied to the air with the supply airAfter the preheater 2, a part of the flue gas enters the hearth, the boiler fuel is saved in an equivalent way, and the temperature of the flue gas converted into the flue gas outlet 2-2 of the air preheater is increased. In general, the heat quantity entering the hearth is less and can be ignored in calculation, so that the heat quantity transferred by cold water to the air supply is equivalently converted into the heat quantity of the flue gas at the flue gas outlet 2-2 of the air preheater, and the heat quantity is set as Q Y Q is then Y ＝Q l ＝Qg+Q d Under the condition of not considering heat dissipation loss, as the flue gas flow rate at the outlet of the air preheater 2 is unchanged, Q Y All of the low temperature heat energy is converted into the rise of the flue gas temperature, so that the low temperature heat energy of the heat medium water from the spray tower 12 is converted into the high temperature heat energy of the outlet flue of the air preheater through the absorption heat pump 90, the first air supply heater 80 and the air preheater 2. The heat exchange area of the flue heat exchanger is large enough, the heat exchange efficiency is 100%, and the heat is converted into the working medium water heat Qz of the working medium water outlet 22-4 of the flue heat exchanger through the flue heat exchanger 22, wherein Qz=Q Y ＝Q l ＝Qg+Q d And the temperature of the working medium water can be increased, namely the heat quality is improved. Part of working medium water at the working medium water outlet 22-4 of the flue heat exchanger is used as a high-temperature driving heat source to be sent back to the high-temperature heat source inlet 93-1 of the generator, the heat quantity is Qg, and the other part of working medium water is sent to a heat user for use, and the heat quantity is Q c . Qz=q Y ＝Q l ＝Qg+Q d ＝Qg+Q c Deriving Q c ＝Q d (in this analysis, the amount of heat of the flue gas transferred to the air preheater flue gas inlet 2-1 and the amount of heat transferred to the flue heat exchanger working fluid water, and the amount of heat transferred to the air supply by the air supply heater 9 are regarded as constants and therefore not counted). That is, the low-temperature heat energy of the spray tower heat medium water outlet 12-4 which is difficult to recycle is recycled through the absorption heat pump 90, the air supply heater 80, the air preheater 2 and the flue heat exchanger 22 and is equally converted into the high-temperature heat energy of the working medium water of the flue heat exchanger 22 which is externally sent out, so that the use range and the use efficiency of the flue gas waste heat are improved. The quantitative analysis herein is to further illustrate the working principle of the present embodiment, and the influence of some secondary factors is omitted.
Optionally, a cold water pump (not shown) is provided on the cold water path through which the absorber cold water inlet 92-1 or the condenser cold water outlet 94-2 communicates directly or indirectly.
Fig. 4 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
As shown in fig. 4, on the basis of fig. 1 or fig. 1-1 or fig. 2 or fig. 3 (on the basis of fig. 2 in this embodiment), the boiler flue gas waste heat recycling system is further provided with a second air supply heater 100; the second air supply heater 100 is provided with a second air supply heater air supply inlet 100-1, a second air supply heater air supply outlet 100-2, a second air supply heater heat medium water inlet 100-3 and a second air supply heater heat medium water outlet 100-4; the air supply passage of the second air supply heater 100 is connected in series to the air passage through which the air supply inlet 8-1 or the air supply outlet 8-2 of the air supply is directly or indirectly connected, and the second air supply heater 100 is disposed between the air supply inlet 80-1 of the first air supply heater and the atmosphere when the first air supply heater 80 is disposed (the first air supply heater 80 is not disposed in the present embodiment); the second air supply heater air supply inlet 100-1 is directly or indirectly communicated with the atmosphere; when the first air supply heater 80 is provided, the second air supply heater air supply outlet 100-2 is directly or indirectly communicated with the first air supply heater air supply inlet 80-1; when the first air-sending heater 80 is not provided but the air-sending heater 9 (the air-sending heater 9 is provided in the present embodiment), the second air-sending heater air-sending outlet 100-2 is directly or indirectly communicated with the air-sending heater air-sending inlet 9-1; when the first air supply heater 80 and the air supply heater 9 are not provided, the second air supply heater outlet 100-2 is directly or indirectly communicated with the air preheater air supply inlet 2-3; the second air supply heater heat medium water inlet 100-3 is directly or indirectly communicated with the spray tower heat medium water outlet 12-4; the second air supply heater heat medium water outlet 100-4 is directly or indirectly communicated with the spray tower heat medium water inlet 12-3; the second air supply heater 100 is a dividing wall type heat exchanger.
The working process is as follows:
the heat medium water from the spray tower heat medium water outlet 12-4 is directly or indirectly sent to the second air supply heater heat medium water inlet 100-3, enters the heat medium water channel of the second air supply heater 100, and the air supply (air) enters the air supply channel of the second air supply heater 100 through the second air supply heater air supply inlet 100-1 under the driving of the blower 8, the temperature of the heat medium water in the heat medium water channel of the second air supply heater 100 is reduced after the air supply of the air supply channel of the second air supply heater 100 is heated, and then flows out through the heat medium water outlet 100-4 of the second air supply heater, returns to the spray tower heat medium water inlet 12-3 for recycling.
The air supply with the temperature increased enters the air preheater 2 through the air supply inlet 2-3 of the air preheater and is further heated and then is sent into the hearth of the boiler 1 through the air supply outlet 2-4 of the air preheater, so that the combustion efficiency of the boiler 1 can be further improved, the recovered flue gas waste heat is sent into the hearth of the boiler 1, the fuel consumption can be equivalently saved, and the efficient utilization of the flue gas waste heat is realized. In addition, as the temperature of the supplied air entering the air preheater 2 increases, the heat exchange amount between the flue gas and the supplied air decreases, the temperature of the flue gas at the outlet of the air preheater 2 increases, the temperature of the flue gas at the flue gas inlet 22-1 increases, and then enters the flue gas channel of the flue heat exchanger 22, the working medium water enters the working medium water channel of the flue heat exchanger 22 from the working medium water inlet 22-3 of the flue heat exchanger, and the flue gas flowing through the flue gas channel of the flue heat exchanger 22 transfers heat to the working medium water flowing through the working medium water channel of the flue heat exchanger 22 through the heat exchanger pipe wall or plate wall (such as a pipe heat exchanger, a plate heat exchanger and the like) or through the heat exchanger pipe wall or plate wall and an intermediate medium. When the flue heat exchanger 22 is a heat pipe heat exchanger (one of the partition wall heat exchangers), the heat exchange process is as follows: the flue gas flowing through the flue gas channel of the flue heat exchanger 22 firstly transfers the heat of the flue gas to an intermediate medium, such as water, in the heat pipe through the heat pipe heat section pipe wall of the flue heat exchanger 22, the intermediate medium is heated and evaporated to be in a gaseous state under the vacuum condition in the heat pipe, and the gaseous intermediate medium in the heat pipe transfers the heat to the heat pipe cold section and transfers the heat to working medium water outside the heat pipe through the heat pipe cold section pipe wall. The heated working medium water is sent to the high temperature heat source inlet 93-1 of the generator through the working medium water outlet 22-4 of the flue heat exchanger as a high temperature driving heat source, so that the low-temperature heat of the heating medium water from the spray tower 12 can be recovered more, and the efficiency and the external heat supply of the absorption heat pump 90 are improved. In addition, the working medium water at the working medium water outlet 22-4 of the flue heat exchanger can also be sent to a heat user for use. The temperature of the working medium is increased, the energy quality is increased, and the heat energy utilization value and the heat energy utilization efficiency are increased. Therefore, this embodiment not only recovers the flue gas waste heat at the outlet of the air preheater 2, but also recovers the low-temperature flue gas waste heat which is difficult to utilize after desulfurization through the mixed heat exchange of the spray tower, and converts the low-temperature flue gas waste heat into high-grade heat energy through the second air supply heater 100 and the air preheater 2, thereby realizing the full recovery and the efficient utilization of the flue gas waste heat, and realizing the increase of the recovery amount of the flue gas waste heat and the improvement of the heat energy quality. The low-grade flue gas waste heat after desulfurization is converted into heat of high-temperature hot water through the spray tower 12, the second air supply heater 100, the air preheater 2 and the flue heat exchanger 22 and is used as a high-temperature driving heat source of the absorption heat pump 90, and further the heat of the low-temperature heat source of the heat medium water from the spray tower 12 is further absorbed through the absorption heat pump 90 and is converted into usable heat energy with higher temperature, so that the low-grade heat energy of the flue gas after desulfurization is driven and absorbed by the low-grade heat energy from the flue gas after desulfurization, and is converted into usable heat energy with higher temperature. In general, the temperature of the flue gas at the outlet of the desulfurizing tower 6 is about 50 ℃, the temperature of the flue gas at the outlet of the air preheater is about 120 ℃, the temperature of the air at the inlet of the air supply heater 80 is about 15 ℃, the temperature of the hot medium water can be increased to about 40 ℃ after the spray tower 12 exchanges heat with the flue gas, the temperature of the air supply of the hot medium water can be increased to about 35 ℃ after the hot medium water is heated by the second air supply heater 100, under the condition that the temperature of the air supply outlet 2-4 of the air preheater is increased because the temperature of the air supply inlet 2-3 of the air preheater is increased (better if income is counted), the temperature of the flue gas at the outlet 2-2 of the air preheater is increased on the basis of 120 ℃ and heat conservation is considered, the heat increment realized by the temperature rise of the flue gas outlet 2-2 of the air preheater is equal to the flue gas waste heat absorbed by the heat medium water from the spray tower 12, namely, the low-grade flue gas waste heat at about 50 ℃ at the outlet of the desulfurizing tower 6 is converted into high-grade flue gas heat at about 120 ℃ through the spray tower 12, the air supply heater 80 and the air preheater 2, so that the heat energy quality of the working medium water at the working medium water outlet 22-4 of the flue heat exchanger is improved, the recovery efficiency of the low-temperature heat of the heat medium water of the spray tower 12 is further improved through the absorption heat pump 90, the high-efficiency recovery of the low-grade flue gas waste heat and the conversion to the high-grade heat energy are realized, and the flue gas waste heat recovery efficiency and the utilization efficiency are improved.
For the unit which needs to be provided with a heater for heating and air supply in order to prevent the cold end of the air preheater 2 from being corroded in winter, the air supply heater can replace the heater, and the flue gas waste heat is utilized to replace a steam heat source, so that the unit has a better energy-saving effect.
The second blast heater 100 has self-adapting and self-adjusting capabilities for stack plume abatement: when the ambient temperature is low, smoke plume phenomenon is aggravated, and the diffusion of smoke pollutants at the outlet of the chimney is worsened; meanwhile, the air temperature of the air supply inlet 100-1 of the second air supply heater is low, the cooling capacity of the second air supply heater 100 to the heat medium water is improved, the temperature of the heat medium water outlet 100-3 of the second air supply heater is reduced, the condensation cooling of the heat medium water to the flue gas in the spray tower 12 is increased, the smoke plume regulating effect of the chimney is enhanced, and pollutants in the flue gas are reduced. And vice versa. When the atmospheric humidity increases, the diffusion of the smoke pollutants at the outlet of the chimney becomes worse, the smoke plume phenomenon is aggravated, meanwhile, the air humidity increases, the specific heat capacity increases, the cooling capacity of the second air supply heater 100 to the heat medium water increases, the temperature of the heat medium water at the heat medium water outlet 100-4 of the second air supply heater decreases, the condensation cooling of the smoke is increased, the smoke plume regulating effect of the chimney is enhanced, and the pollutants in the smoke are reduced. And vice versa.
The system can effectively solve the problems of corrosion and blockage of the air preheater 2: the temperature of the exhaust gas of the air preheater 2 is increased, so that the risk of corrosion and blockage of the cold end of the air preheater 2 can be greatly reduced. At present, most boiler units are provided with a denitration system, when the boiler load is low and the flue gas temperature is low, the efficiency of the denitration system is reduced, the ammonia spraying amount is required to be increased, and excessive ammonia gas reacts with sulfide in the flue gas to generate ammonium bisulfate. As the temperature of the flue gas in the air preheater gradually decreases, ammonium bisulfate changes from a gas state to a nasal mucus state in the air preheater 2 to adhere to dust, and when the temperature is reduced below 147 ℃, the ammonium bisulfate solidifies and deposits on heat exchange elements of the air preheater 2 to form scale, thereby causing corrosion and blockage of the air preheater 2 and seriously affecting the operation of the air preheater. The system can raise the exhaust gas temperature of the air preheater 2 to be higher than the liquefaction temperature of ammonium bisulfate or even higher than the gasification temperature, and can effectively avoid the problems of corrosion and blockage of the air preheater 2 caused by ammonium bisulfate. The method can be used for improving the flexibility of the thermal power plant, reducing the load of the lowest stable unit and improving the peak shaving capacity.
The first air blast heater 80 or the second air blast heater 100 may be disposed on an air blast passage between the blower air blast outlet 8-2 and the air preheater air blast inlet 2-3; alternatively, the first blower heater 80 and the second blower heater 100 are provided at the blower inlet 8-1. The former mode is characterized in that the temperature of the air supply is increased after the air supply is driven and pressurized by the air blower, and under the same condition, the heat transferred to the air supply by the heater is reduced, but the power consumption of the air blower is basically unchanged; the latter approach has the advantage that the heater inlet air temperature is low and, under the same conditions, the heater can transfer more heat to the supply air, but the power consumption of the blower will increase slightly. Considering that the ambient temperature is generally below 40 ℃, the influence on the power consumption of the air supply is small. Thus, the advantages of the latter approach will be greater.
Considering that the heating temperatures of the air-sending heater 9, the first air-sending heater 80, and the second air-sending heater 100 are different, the three are arranged in the order of the second air-sending heater 100, the first air-sending heater 80, and the air-sending heater 9 along the air-sending direction. That is, the air passes through the second air-supply heater air-supply inlet 100-1, the second air-supply heater 100 air-supply passage, the second air-supply heater air-supply outlet 100-2 (when the second air-supply heater 100 is provided), the first air-supply heater air-supply inlet 80-1, the first air-supply heater 80 air-supply passage, the first air-supply heater air-supply outlet 80-2 (when the first air-supply heater 80 is provided), the air-supply heater air-supply inlet 9-1, the air-supply heater 9 air-supply passage, the air-supply heater air-supply outlet 9-2 (when the air-supply heater 9 is provided), and the air-preheater air-supply inlet 2-3 in this order.
Fig. 5 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
As shown in fig. 5, in the system for recycling flue gas waste heat of the boiler based on fig. 1, 2, 3 or 4 (this embodiment is based on fig. 1), a third air supply heater 101 is further connected in series to an air supply passage between the air preheater air supply inlet 2-3 and the air supply outlet 8-2 of the air supply fan; a first flue heat exchanger 5 is arranged between the flue gas outlet 22-2 of the flue heat exchanger and the flue gas inlet 6-5 of the desulfurizing tower; the third air supply heater 101 is provided with a third air supply heater air supply inlet 101-1, a third air supply heater air supply outlet 101-2, a third air supply heater working medium water inlet 101-3 and a third air supply heater working medium water outlet 101-4; the third air supply heater air supply inlet 101-1 is directly or indirectly communicated with the air supply outlet 8-2 of the air supply machine; the third air supply heater air supply outlet 101-2 is directly or indirectly communicated with the air preheater air supply inlet 2-3; the third air supply heater 101 is a dividing wall type heat exchanger; the first flue heat exchanger 5 is provided with a first flue heat exchanger flue gas inlet 5-1, a first flue heat exchanger flue gas outlet 5-2, a first flue heat exchanger working medium water inlet 5-3 and a first flue heat exchanger working medium water outlet 5-4; the flue gas outlet 22-2 of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet 5-1 of the first flue heat exchanger; the flue gas outlet 5-2 of the first flue heat exchanger is directly or indirectly communicated with the flue gas inlet 6-5 of the desulfurizing tower; the first flue heat exchanger 5 is a dividing wall type heat exchanger; the third air supply heater working medium water inlet 101-3 is directly or indirectly communicated with the first flue heat exchanger working medium water outlet 5-4; the third air supply heater working medium water outlet 101-3 is directly or indirectly communicated with the first flue heat exchanger working medium water inlet 5-3.
The working process is as follows:
the flue gas from the flue heat exchanger flue gas outlet 22-2 directly or indirectly enters the flue gas channel of the first flue heat exchanger 5 through the first flue heat exchanger flue gas inlet 5-1, and then enters the desulfurizing tower flue gas inlet 6-5 through the first flue heat exchanger flue gas outlet 5-2. Working medium water from the working medium water outlet 101-4 of the third air supply heater enters the working medium water channel of the first flue heat exchanger 5 through the working medium water inlet 5-3 of the first flue heat exchanger, is heated and warmed by flue gas flowing through the flue gas channel of the first flue heat exchanger 5, enters the working medium water channel of the third air supply heater 101 through the working medium water outlet 5-4 of the first flue heat exchanger and the working medium water inlet 101-3 of the third air supply heater, is cooled after being heated and blown by the air flowing through the air supply channel of the third air supply heater 101, flows out through the working medium water outlet 101-4 of the third air supply heater, returns to the working medium water inlet 5-3 of the first flue heat exchanger, and is recycled.
The air is heated by the third air heater 101 by the blower 8, and then is sent to the air preheater 2. The first flue heat exchanger 5 is arranged to more fully recover the waste heat of the flue gas, and the flue gas temperature of the flue gas outlet 2-2 of the air preheater can be further improved through the air preheater 2, so that more recovery of the waste heat of the flue gas and improvement of the heat grade are realized.
Optionally, a dust remover 60 and/or an induced draft fan 61 are/is connected in series on the flue gas channel between the flue gas heat exchanger 22 and the first flue gas heat exchanger 5;
optionally, a third working medium water circulating water pump (not shown in the figure) is arranged on the working medium water channel directly or indirectly communicated with the working medium water outlet 101-4 of the third air supply heater or the working medium water inlet 101-3 of the third air supply heater.
In practical application, the relative positions of the third air-sending heater 101 and the air-sending heater 9 or the first air-sending heater 80 or the second air-sending heater 100 in the present utility model are determined according to the respective hot-side water medium temperatures, and the heater with the high hot-side water medium temperature is disposed at a position closer to the air-sending inlet 2-3 of the air preheater.
Fig. 6 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
As shown in fig. 6, on the basis of fig. 1 or fig. 2 or fig. 3 or fig. 4 or fig. 5 (on the basis of fig. 1 in this embodiment), the boiler flue gas waste heat recovery system is further provided with a first absorption heat pump 40; the first absorption heat pump 40 comprises a first evaporator 41, a first absorber 42, a first generator 43 and a first condenser 44, wherein the first evaporator 41 is provided with a first evaporator low-temperature heat source inlet 41-1, a first evaporator low-temperature heat source outlet 41-2, a first evaporator refrigerant water inlet 41-3 and a first evaporator refrigerant water vapor outlet 41-4; the first absorber 42 is provided with a first absorber cold water inlet 42-1, a first absorber cold water outlet 42-2, a first absorber refrigerant vapor inlet 42-3, a first absorber concentrated absorbent solution inlet 42-4, and a first absorber dilute absorbent solution outlet 42-5; the first generator 43 is provided with a first generator high temperature heat source inlet 43-1, a first generator high temperature heat source outlet 43-2, a first generator dilute absorbent solution inlet 43-3, a first generator concentrated absorbent solution outlet 43-4 and a first generator refrigerant water vapor outlet 43-5; the first condenser 44 is provided with a first condenser cooling water inlet 44-1, a first condenser cooling water outlet 44-2, a first condenser refrigerant water vapor inlet 44-3, and a first condenser refrigerant water outlet 44-4.
The first evaporator refrigerant water inlet 41-3 communicates directly or indirectly with the first condenser refrigerant water outlet 44-4; the first evaporator refrigerant vapor outlet 41-4 communicates directly or indirectly with the first absorber refrigerant vapor inlet 42-3; the first absorber concentrated absorbent solution inlet 42-4 communicates directly or indirectly with the first generator concentrated absorbent solution outlet 43-4; the first absorber lean absorbent solution outlet 42-5 is in direct or indirect communication with the first generator lean absorbent solution inlet 43-3; the first generator refrigerant vapor outlet 43-5 communicates directly or indirectly with the first condenser refrigerant vapor inlet 44-3; the first absorber cold water outlet 42-2 communicates directly or indirectly with the first condenser cold water inlet 44-1; the absorption heat pump 40 constitutes a first type of absorption heat pump, i.e. a heat-increasing absorption heat pump;
the spray tower heating medium water outlet 12-4 is also directly or indirectly communicated with the first evaporator low temperature heat source inlet 41-1; the low-temperature heat source outlet 41-2 of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet 12-3; the first generator 43 high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet 93-2 and the flue heat exchanger working medium water inlet 22-3; the first generator high temperature heat source inlet 43-1 is directly or indirectly communicated with the generator high temperature heat source outlet 93-2; the first generator high-temperature heat source outlet 43-2 is directly or indirectly communicated with the flue heat exchanger working medium water inlet 22-3; the cold water path of the first absorber 42 and the first condenser 44 connected in series is connected in series to the cold water path of the absorber cold water inlet 92-1; the first condenser cooling water outlet 44-2 communicates directly or indirectly with the absorber cold water inlet 92-1;
When the air supply heater 9 is arranged, the first generator high-temperature heat source outlet 43-2 is directly or indirectly communicated with the air supply heater working medium water inlet 9-3, and the air supply heater working medium water outlet 9-4 is directly or indirectly communicated with the flue heat exchanger working medium water inlet 22-3.
The working principle is as follows:
the high-temperature working medium water from the flue heat exchanger working medium water outlet 22-4 is used as a high-temperature driving heat source of the absorption heat pump 90, enters the generator 93 through the generator high-temperature heat source inlet 93-1, flows out of the absorption heat pump 90 through the generator high-temperature heat source outlet 93-2 after heat exchange and temperature reduction of the working medium water, then enters the first generator 43 through the first generator high-temperature heat source inlet 43-1 as a high-temperature driving heat source of the first absorption heat pump 40, and flows out of the first absorption heat pump 40 through the first generator high-temperature heat source outlet 43-2 after further heat exchange and temperature reduction of the working medium water; the working fluid water is returned to the flue heat exchanger 22 for recycling.
When the air supply heater 9 is arranged, working medium water flowing out of the first absorption heat pump 40 through the first generator high-temperature heat source outlet 43-2 is sent to the air supply heater 9 to be heated and sent to the flue heat exchanger 22 for recycling after further cooling.
The heat medium water from the spray tower heat medium water outlet 12-4 is used as a low-temperature heat source of the absorption heat pump 90, enters the evaporator 91 through the evaporator low-temperature heat source inlet 91-1, is extracted by the absorption heat pump 90, flows out of the absorption heat pump 90 through the evaporator low-temperature heat source outlet 91-2 after being cooled, and returns to the spray tower 12 for recycling; similarly, the heat medium water from the spray tower heat medium water outlet 12-4 is used as a low-temperature heat source of the first absorption heat pump 40, enters the evaporator 41 through the low-temperature heat source inlet 41-1 of the first evaporator, is extracted by the absorption heat pump 40 to cool, flows out of the absorption heat pump 40 through the low-temperature heat source outlet 41-2 of the evaporator, and returns to the spray tower 12 for recycling; cold water firstly enters the first absorption heat pump 40 through the first absorber cold water inlet 42-1 for heating, the warmed cold water flows out of the first absorption heat pump 40 through the first condenser cooling water outlet 44-2, then enters the absorption heat pump 90 through the absorber cold water inlet 92-1 for further heating, and the further warmed cold water flows out of the absorption heat pump 90 through the condenser cooling water outlet 94-2 for being sent to a hot user for use.
The cold water at the first absorber inlet 42-1 comes from other process links or from off-system heat users.
In general, in order to control the manufacturing cost of the absorption heat pump 90, the temperature reduction range of the high-temperature driving heat source in the generator 93 of the absorption heat pump 90 is not too large, that is, the temperature of the working medium water at the high-temperature heat source outlet 93-2 of the generator is relatively high. Therefore, the first absorption heat pump 40 is provided, and the high-temperature driving heat source is sent to the first absorption heat pump 40 for further heat exchange and temperature reduction after the heat exchange and temperature reduction of the absorption heat pump 90, so that the heat of the high-temperature driving heat source can be fully utilized. In addition, since the high-temperature driving heat source temperature of the first absorption heat pump 40 is low, and the cold water temperature of the condenser cooling water outlet 44-2 is low in order to improve the efficiency of the first absorption heat pump 40, the cold water of the condenser cooling water outlet 44-2 of the first absorption heat pump 40 needs to be sent to the absorption heat pump 90 for further heating, and the efficiency of the absorption heat pump 90 can be improved. In this way, the heat of the high-temperature driving heat source from the flue heat exchanger 22 can be fully utilized, and the low-grade heat of the heat medium water from the heat medium water outlet 12-4 of the spray tower can be absorbed more, so that the recovery efficiency and the utilization efficiency of the flue gas waste heat after desulfurization are improved.
The operation principle of the first absorption heat pump 40 is the same as that of the absorption heat pump 90, and will not be described here again.
Fig. 7 is a schematic structural diagram of an embodiment of a desulfurizing tower and a spray tower in the boiler flue gas waste heat recovery and utilization system of the present utility model.
As shown in fig. 7, in the system for recycling flue gas waste heat of a boiler, the spray tower 12 is arranged above the desulfurizing tower 6, and the desulfurizing tower 6 and the spray tower 12 are connected through the liquid collecting device 12-7 to form a desulfurizing and spraying integrated structure. The desulfurization spraying integrated structure is internally provided with a slurry pool 6-3, a desulfurization tower flue gas inlet 6-5, a desulfurization tower spraying device 6-6, a desulfurization tower demister 6-7, a liquid collecting device 12-7, a spray tower water distributing device 12-6 and a spray tower flue gas outlet 12-2 from bottom to top.
The liquid collecting device 12-7 is a multifunctional integrated structure comprising the flue gas outlet 6-4 of the desulfurizing tower, the flue gas inlet 12-1 of the spraying tower and the water receiving device 12-5 of the spraying tower, flue gas from the desulfurizing tower 6 can enter the spraying tower 12 through the liquid collecting device 12-7, and heat medium water from the water distributing device 12-6 of the spraying tower falls into the liquid collecting device 12-7 to be collected and is led out of the spraying tower 12 through the heat medium water outlet 12-4 of the spraying tower to be incapable of flowing into the desulfurizing tower 6.
The tower wall of the tower body above the liquid collecting device 12-7 (the spray tower body in the present embodiment) and the tower wall of the tower body below the liquid collecting device 12-7 (the desulfurizing tower body in the present embodiment) can be directly connected, and the liquid collecting device 12-7 is arranged in the combined part of the tower wall of the tower body above the liquid collecting device 12-7 and the tower wall of the tower body below the liquid collecting device 12-7 and is separated up and down by the liquid collecting device 12-7; the tower wall of the tower body above the liquid collecting device 12-7 can be connected with the liquid collecting device 12-7, and then the liquid collecting device 12-7 is connected with the tower wall of the tower body below the liquid collecting device.
The structure has the advantages of saving occupied space, reducing system resistance and having great advantages especially for the improvement of the existing unit. The liquid collecting device 12-7 can be a water receiving disc commonly used in single-tower double-circulation, a liquid collector commonly used in the chemical industry, a liquid collector and the like, so long as the functional requirements of the liquid collecting device are met.
Fig. 8 is a schematic structural diagram of an embodiment of a liquid collecting device in the boiler flue gas waste heat recovery system of the present utility model.
As shown in fig. 8, the liquid collecting device 12-7 has a liquid collecting and demisting integrated structure with demisting function. The liquid collecting and demisting integrated structure comprises a liquid collecting chassis 12-8, a gas lift pipe 12-9 and a gas lift cap 12-10. The liquid collecting chassis 12-8 is provided with a plurality of vent holes 12-11, the vent holes 12-11 are correspondingly provided with the gas raising pipes 12-9, the top ends of the gas raising pipes 12-9 are provided with the gas raising caps 12-10, and gas raising channels 12-13 for flue gas circulation are arranged between the gas raising caps 12-10 or between the gas raising caps 12-10 and the top ends of the gas raising pipes 12-9 or on the pipe wall of the upper section of the gas raising pipes 12-9; the draft tube 12-9 is provided with guide vanes or swirlers 12-12 therein (fig. 8a, 8b are schematic structural views of an embodiment of the guide vanes); the liquid collecting chassis 12-8 is provided with a water blocking edge 12-4 or the liquid collecting chassis 12-8 is in sealing connection with the inner wall of the tower body of the desulfurization spraying integrated structure and takes the inner wall of the desulfurization spraying integrated structure as a water blocking edge 12-14, an upward opening space enclosed between the liquid collecting chassis 12-8 and the water blocking edge 12-14 is taken as a spray tower water receiving device 12-5, and the spray tower water receiving device 12-5 is communicated with the spray tower heating medium water outlet 12-4. The guide vane or the cyclone 12-12 is fixedly arranged in the gas lift pipe, and when the flue gas flows through the guide vane or the cyclone from bottom to top, the flue gas generates high-speed rotary motion taking the central line of the gas lift pipe as the center under the guide effect of the flue gas and takes spiral ascending motion.
The structure can purify the flue gas entering the spray tower 12, reduce the pollution of the flue gas to the heat medium water, and simultaneously reduce the height of the desulfurization and spray integrated structure.
The working principle is as follows: the flue gas with particles and fog drops from the desulfurizing tower 6 flows upwards into the gas lift pipe 12-9 in the liquid collecting and demisting integrated structure 12-7, the flue gas rotates at a high speed and ascends around the central line of the gas lift pipe 12-9 under the action of the guide vane or the cyclone 12-12 in the gas lift pipe 12-9, namely, the flue gas moves in a spiral ascending mode, the particles and the fog drops collide with each other and are condensed into large particles, the large particles and the fog drops as well as the heavy particles with a specific gravity are thrown to the pipe wall of the gas lift pipe 12-9 under the action of centrifugal force to be trapped, and then flow downwards under the action of gravity, so that the separation and removal of the particles, the fog drops and the flue gas are realized. The flue gas continues to flow upwards to the gas raising cap 12-10, flows into the spray tower 12 from the gas raising cap itself or the gas raising channel 12-13 arranged between the top end of the gas raising cap 12-10 and the gas raising pipe 12-9 or on the pipe wall of the upper section of the gas raising pipe 12-9, flows upwards to be mixed and heat exchanged with the heat medium water falling from the spray tower water distribution device 12-6 from top to bottom in countercurrent, and then the temperature, humidity and pollutants of the flue gas are further reduced, and flows out of the spray tower 12 through the spray tower flue gas outlet 12-2. The heat medium water from the spray tower water distribution device 12-6 falls into the spray tower water receiving device 12-5 from top to bottom, and the heat medium water together with condensed water condensed and separated from the flue gas is led out of the spray tower 12 through the spray tower heat medium water outlet 12-4. The function of the gas-raising cap 12-10 is to enable the flue gas from the desulfurizing tower 6 to flow into the spraying tower 12, while the heat medium water from the water distribution device 12-6 of the spraying tower 12 cannot flow into the desulfurizing tower 6. The lift cap may take the shape of a cap, a shutter, or other commercially available lift cap forms, as long as the above-described function is achieved. The air lifting cap and the air lifting pipe can be of an integrated structure or a split structure. One of the gas risers may correspond to one of the gas caps, or two or more of the gas risers may share one of the gas caps.
It is possible to take the form of a structure in which the outer diameter of the gas-raising cap 12-10 is larger than the outer diameter of the gas-raising tube 12-9, that is, the vertical projection of the gas-raising cap 12-10 is completely covered and larger than the vertical projection of the gas-raising tube. Since the diameter of the gas-raising cap 12-10 is larger than the outer diameter of the gas-raising pipe 12-9, the heat medium water cannot flow into the gas-raising pipe 12-9, that is, cannot flow into the desulfurizing tower 6.
The distance of each of the risers 12-9 can be appropriately adjusted as needed to provide the desired volume of the heat medium water reservoir.
The liquid collecting device 12-7 can also adopt the structure shown in fig. 8-1, a demisting pipe 12-15 is connected below the gas raising pipe 12-9, and a guide vane or a cyclone is arranged in the demisting pipe. The working principle is basically the same as that of the prior art.
The liquid collecting device 12-7 can also adopt the structure shown in fig. 8-2, a demisting pipe 12-15 is arranged in the gas raising pipe 12-9, and guide vanes or swirlers are arranged in the demisting pipe. The working principle is basically the same as that of the prior art.
The riser pipe 12-9 and the demisting pipe 12-15 can be separated or integrated.
Optionally, the water blocking edge is connected with the tower body above the liquid collecting device (the tower body of the spray tower in the embodiment) or/and the tower body below the liquid collecting device (the tower body of the desulfurizing tower in the embodiment) to form an integrated structure. The tower wall of the tower body above the liquid collecting device 12-7 and the tower wall of the tower body below the liquid collecting device 12-7 can be directly connected, the liquid collecting device 12-7 is arranged in the combination part of the tower wall of the tower body above the liquid collecting device 12-7 and the tower wall of the tower body below the liquid collecting device 12-7, and is vertically separated through the liquid collecting device 12-7, the inner wall of the tower body above the liquid collecting device 12-7 can be used as a water blocking edge, and the liquid collecting and demisting integrated structure can also be provided with a water blocking edge on the liquid collecting chassis; the tower wall of the tower body above the liquid collecting device 12-7 can be connected with the water blocking edge of the liquid collecting device 12-7, and then the water blocking edge of the liquid collecting device 12-7 is connected with the tower wall of the tower body below the water blocking edge.
Fig. 9 is a schematic structural view of another embodiment of the liquid collecting device in the boiler flue gas waste heat recovery system of the present utility model.
Fig. 9-1 is a schematic structural view of an embodiment of an air cap of a liquid collecting device.
As shown in fig. 9 and 9-1, on the basis of fig. 8, the lift cap 12-10 adopts a tower-type shutter structure with a smaller top and a larger bottom, and flue gas from below the lift cap 12-10 can flow to above the lift cap 12-10 through the lift cap 12-10, but heat medium water from above the lift cap 12-10 cannot flow to below the lift cap 12-10 through the lift cap 12-10; in addition, the outer diameter of the riser cap and the outer diameter of the riser are smaller than or equal to the inner diameter of the vent hole 12-11 on the liquid collecting chassis 12-8, so that the riser 12-9 and the riser cap 12-10 can be pulled out from the lower part of the liquid collecting chassis 12-8 for maintenance. The purpose is mainly to reduce the height of the desulfurization spraying integrated structure.
Fig. 10 is a schematic structural view of another embodiment of a desulfurizing tower and a spray tower in the boiler flue gas waste heat recovery and utilization system of the present utility model.
As shown in FIG. 10, a filler layer 12-16 is disposed between the liquid collecting device 12-7 and the water distributing device 12-6. The advantages are that: when the flow rate of the heating medium is fixed, the residence time and the heat transfer area of the heating medium can be improved, and the heat exchange efficiency and the outlet water temperature can be improved.
Fig. 11 and 11-1 are schematic structural views of another two embodiments of the boiler flue gas waste heat recovery system according to the present utility model.
As shown in fig. 11 and 11-1, on the basis of fig. 3 and 4, the boiler flue gas waste heat recycling system is further provided with a steam turbine high-medium pressure cylinder 25, a steam turbine low-pressure cylinder 26, a condenser 27, a low-pressure heater 28, a deaerator 29 and a high-pressure heater 30; wherein,
the steam turbine high-pressure and medium-pressure cylinder 25 is provided with a high-pressure and medium-pressure cylinder steam inlet 25-1, a high-pressure and medium-pressure cylinder steam outlet 25-2 and a high-pressure and medium-pressure cylinder steam extraction outlet 25-3;
the low-pressure cylinder 26 of the steam turbine is provided with a low-pressure cylinder steam inlet 26-1, a low-pressure cylinder steam outlet 26-2 and a low-pressure cylinder steam extraction outlet 26-3;
the condenser 27 is provided with a condenser steam inlet 27-1 and a condenser working medium water outlet 27-2;
the low-pressure heater 28 is provided with a low-pressure heater working medium water inlet 28-1, a low-pressure heater working medium water outlet 28-2 and a low-pressure heater steam extraction inlet 28-3;
the deaerator 29 is provided with a deaerator working medium water inlet 29-1 and a deaerator working medium water outlet 29-2;
the high-pressure heater 30 is provided with a high-pressure heater working medium water inlet 30-1 and a high-pressure heater working medium water outlet 30-2;
the boiler 1 is also provided with a boiler steam outlet 1-4 and a boiler working medium water inlet 1-5;
The boiler steam outlet 1-4 is directly or indirectly communicated with the high and medium pressure cylinder steam inlet 25-1; the high and medium pressure cylinder steam outlet 25-2 is directly or indirectly communicated with the low pressure cylinder steam inlet 26-1; the low pressure cylinder steam outlet 26-2 is directly or indirectly communicated with the condenser steam inlet 27-1; the condenser working medium water outlet 27-2 is simultaneously and directly communicated with the low-pressure heater working medium water inlet 28-1 and the flue heat exchanger working medium water inlet 22-3 or indirectly communicated with other devices (such as a heater, a heat exchanger for heating working medium water and the like); the flue heat exchanger working medium water outlet and the low-pressure heater working medium water outlet 28-2 are directly or indirectly communicated with the deaerator working medium water inlet 29-1; the deaerator working medium water outlet 29-2 is directly or indirectly communicated with the high-pressure heater working medium water inlet 30-1; the high-pressure heater working medium water outlet 30-2 is directly or indirectly communicated with the boiler working medium water inlet 1-5; the low pressure heater extraction inlet 28-3 communicates directly or indirectly with the low pressure cylinder extraction outlet 26-3 and/or the high and medium pressure cylinder extraction outlet 25-3.
The working process and the working principle are as follows:
the steam generated by the combustion of the boiler 1 is orderly subjected to work in a high-pressure cylinder 25 and a low-pressure cylinder 26 of the steam turbine, the pressure and the temperature are reduced, the steam is discharged into a condenser 27, the steam is cooled by the condenser 27 and condensed into working medium water (condensed water), then the working medium water is split or split after passing through other equipment (such as a water pump, a heater, a heat exchanger for heating the working medium water and the like), one path of the working medium water is sent to a low-pressure heater 28, the working medium water is heated in the low-pressure heater 28 by using the extraction steam from the low-pressure cylinder 26 of the steam turbine or/and part of the extraction steam of the high-pressure cylinder and the medium water after the temperature is raised, and the working medium water after the temperature is raised is sent to a deaerator 29 for deaeration; the other path directly or indirectly (through a heat exchanger, a buffer water tank, a water pump, a first flue heat exchanger and the like) enters the flue heat exchanger 22 through a flue heat exchanger working medium water inlet 22-3 to be heated by utilizing the waste heat of the flue gas, and the heated working medium water flows out of the flue heat exchanger 22 through a flue heat exchanger working medium water outlet 22-4 and enters a deaerator 29 through a deaerator working medium water inlet 29-1 to be deaerated; working medium water from the low-pressure heater 28 and the flue heat exchanger 22 respectively enters the deaerator 29 to be deaerated, then is sent out to the high-pressure heater 30 through the deaerator working medium water outlet 29-2, is sent into the boiler 1 through the high-pressure heater working medium water outlet 30-2 and the boiler working medium water inlet 1-5 after being reheated and heated by the high-pressure heater 30, then is heated by the boiler 1 to generate steam, and is sent to the turbine high-medium pressure cylinder 25 and the turbine low-pressure cylinder 26 to do work and generate power, and is circulated in sequence. Thereby completing the process of heating and raising the temperature of the boiler working medium water by utilizing the waste heat of the exhaust smoke of the air preheater 2, and saving the steam extraction of the low-pressure cylinder or/and the steam extraction of part of the high-pressure cylinder for heating the working medium water in the traditional technology. The part of the extraction steam can return to the low-pressure cylinder or/and the high-medium pressure cylinder to do work for power generation, and can also be extracted from the high-medium pressure cylinder for external heat supply. Therefore, the power generation coal consumption is reduced, the power generation capacity, the heat supply capacity and the thermoelectric ratio of the steam turbine are improved, the lowest steam inlet flow of the low-pressure cylinder can be reduced, and the peak regulation capacity and the flexibility of the unit are improved.
Working medium water at a working medium water outlet 22-4 of the flue heat exchanger is sent to a high-temperature heat source inlet 93-1 of the generator as a high-temperature driving heat source of the absorption heat pump; one path is sent to the deaerator 29 to deoxidize and then is used as working medium water of the boiler 1.
The low-pressure heater and the high-pressure heater are generally multi-stage, and the low-pressure cylinder steam extraction and the high-pressure cylinder steam extraction are also generally multi-stage. The low-pressure heater adopts the low-pressure cylinder to extract steam to heat working medium water, some units also use part of the high-pressure cylinder to extract steam to heat working medium water, and some units do not use the high-pressure cylinder to extract steam but only use the low-pressure cylinder to extract steam to heat working medium water. The working fluid water at the working fluid water outlet 27-2 of the condenser can be heated by a low-pressure heater at one stage or more or/and the first flue heat exchanger 5 (when the first flue heat exchanger 5 is arranged), or/and a buffer water tank or/and a water pump and then sent to the working fluid water inlet 22-3 (not shown in the figure) of the flue heat exchanger; the working medium water at the working medium water outlet 22-4 of the flue heat exchanger can be sent to the working medium water inlet 29-1 (not shown in the figure) of the deaerator after being reheated by a low-pressure heater at one stage or more, namely, the working medium water outlet 22-4 of the flue heat exchanger is indirectly communicated with the working medium water inlet 29-1 of the deaerator.
The purpose of deoxidization is to remove oxygen in the working medium water so as to avoid corrosion of the working medium water to the working medium water channel of the boiler.
The boiler flue gas waste heat recycling system and the method can fully recycle and efficiently utilize the boiler flue gas waste heat, the low-temperature low-grade flue gas waste heat is improved to high-temperature high-grade heat energy, the heat energy is utilized to heat working medium water from the condenser 27, so that more and higher-temperature steam turbine cylinder extraction steam is saved, the extraction steam can return to a low-pressure cylinder or/and a high-medium-pressure cylinder to do work for power generation, the power generation coal consumption is further greatly reduced, and the power generation capacity is further increased; the part of the extracted steam can be extracted from the high-medium pressure cylinder to supply heat to the outside, so that the cold end loss of the steam turbine is reduced, the heat supply capacity, the thermoelectric ratio and the flexibility are further greatly improved, and the comprehensive power generation coal consumption (when the steam turbine is used for power generation) is reduced.
Optionally, a water feed pump (not shown) is arranged between the deaerator working fluid water outlet 29-2 and the high pressure heater working fluid water inlet 30-1 for driving the working fluid water to flow.
The boiler working fluid water inlet 1-5 may also be in direct or indirect communication with the low pressure heater working fluid water outlet 28-2 without the high pressure heater 30 and deaerator 29. That is, the working fluid water from the low-pressure heater working fluid water outlet 28-2 may directly or indirectly enter the boiler working fluid water inlet 1-5 without passing through the high-pressure heater 30 and the deaerator 29.
The boiler working medium water inlet 1-5 can also be directly or indirectly communicated with the flue heat exchanger working medium water outlet 22-4 without a high-pressure heater 30 and a deaerator 29; that is, the working fluid water from the flue heat exchanger working fluid water outlet 22-4 may directly or indirectly enter the boiler working fluid water inlet 1-5 without passing through the high pressure heater 30 and the deaerator 29.
Optionally, a working fluid water pump, such as a condensate water pump, is arranged on the working fluid water channel directly or indirectly communicated with the working fluid water outlet 27-2 of the condenser.
Optionally, the condenser working fluid water outlet 27-2 is directly or indirectly communicated with the low pressure heater working fluid water inlet 28-1 and the flue heat exchanger working fluid water inlet 22-3 through a first low pressure heater (not shown in the figure); the first low-pressure heater is one-stage or multi-stage;
optionally, a heater or/and a working medium water pump or/and a buffer water tank are connected in series on a branch channel between the working medium water outlet 27-2 of the condenser and the working medium water inlet 22-3 of the flue heat exchanger.
The foregoing description is only exemplary of the utility model and is not intended to limit the scope of the utility model. Equivalent alterations, modifications and combinations will be effected by those skilled in the art without departing from the spirit and principles of this utility model.
Claims (53)
1. A boiler flue gas waste heat recovery system, comprising: the system comprises a boiler, an air preheater, a flue heat exchanger, a desulfurizing tower, a spray tower, a chimney, a blower and an absorption heat pump; wherein,
the boiler is provided with a fuel inlet, a boiler air supply inlet and a boiler flue gas outlet;
the air preheater is provided with an air preheater flue gas inlet, an air preheater flue gas outlet, an air preheater air supply inlet and an air preheater air supply outlet;
the flue heat exchanger is provided with a flue heat exchanger smoke inlet, a flue heat exchanger smoke outlet, a flue heat exchanger working medium water inlet and a flue heat exchanger working medium water outlet; the flue heat exchanger is a dividing wall type heat exchanger;
the desulfurizing tower includes: a desulfurizing tower body and a slurry circulating pump; a slurry pond is arranged at the bottom of the desulfurizing tower body; the lower part of the desulfurizing tower body is provided with a desulfurizing tower flue gas inlet, and the upper part of the desulfurizing tower body is provided with a desulfurizing tower flue gas outlet; a desulfurizing tower spraying device is arranged between the desulfurizing tower flue gas inlet and the desulfurizing tower flue gas outlet, the desulfurizing tower spraying device is directly or indirectly communicated with the slurry circulating pump, and the slurry circulating pump is directly or indirectly communicated with the slurry pool; optionally, a desulfurizing tower demister is arranged between the desulfurizing tower spraying device and the desulfurizing tower flue gas outlet;
The spray tower comprises a spray tower body; the spray tower body is provided with a spray tower smoke inlet, a spray tower smoke outlet, a spray tower heating medium water inlet and a spray tower heating medium water outlet; a spray tower water receiving device is arranged at the bottom of the spray tower body; a spray tower water distribution device for heating medium water is arranged between the spray tower flue gas inlet and the spray tower flue gas outlet; the spray tower water distribution device is directly or indirectly communicated with the spray tower heat medium water inlet, and the spray tower water receiving device is directly or indirectly communicated with the spray tower heat medium water outlet; optionally, the spray tower water distribution device is a water distribution tank or a water distribution pipe or a spray device;
the blower is provided with a blower inlet and a blower outlet; the air supply inlet of the air blower is directly or indirectly communicated with the atmosphere; the air supply outlet of the blower is directly or indirectly communicated with the air supply inlet of the air preheater; the air preheater air supply outlet is directly or indirectly communicated with the boiler air supply inlet;
the boiler flue gas outlet is directly or indirectly communicated with the air preheater flue gas inlet; the flue gas outlet of the air preheater is directly or indirectly communicated with the flue gas inlet of the flue heat exchanger, the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower, the flue gas outlet of the desulfurizing tower is directly or indirectly communicated with the flue gas inlet of the spraying tower, and the flue gas outlet of the spraying tower is directly or indirectly communicated with the chimney;
The absorption heat pump comprises an evaporator, an absorber, a generator and a condenser, wherein the evaporator is provided with an evaporator low-temperature heat source inlet, an evaporator low-temperature heat source outlet, an evaporator refrigerant water inlet and an evaporator refrigerant water vapor outlet; the absorber is provided with an absorber cold water inlet, an absorber cold water outlet, an absorber refrigerant water vapor inlet, an absorber concentrated absorbent solution inlet and an absorber diluted absorbent solution outlet; the generator is provided with a generator high-temperature heat source inlet, a generator high-temperature heat source outlet, a generator dilute absorbent solution inlet, a generator concentrated absorbent solution outlet and a generator refrigerant water vapor outlet; the condenser is provided with a condenser cooling water inlet, a condenser cooling water outlet, a condenser refrigerant water vapor inlet and a condenser refrigerant water outlet;
the evaporator refrigerant water inlet is in direct or indirect communication with the condenser refrigerant water outlet; the evaporator refrigerant vapor outlet is in direct or indirect communication with the absorber refrigerant vapor inlet; the absorber concentrated absorbent solution inlet is directly or indirectly communicated with the generator concentrated absorbent solution outlet; the absorber lean absorbent solution outlet is directly or indirectly communicated with the generator lean absorbent solution inlet; the generator refrigerant water vapor outlet is directly or indirectly communicated with the condenser refrigerant water vapor inlet;
The absorber cold water outlet is directly or indirectly communicated with the condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is directly or indirectly communicated with the evaporator low-temperature heat source inlet; the low-temperature heat source outlet of the evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the working medium water outlet of the flue heat exchanger is directly or indirectly communicated with the high-temperature heat source inlet of the generator; the high-temperature heat source outlet of the generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger;
optionally, a dust remover or/and a draught fan are connected in series at the flue gas inlet of the flue heat exchanger or the flue gas outlet of the flue heat exchanger;
optionally, the spray tower heating medium water inlet is also in direct or indirect communication with a raw water source device, and the spray tower heating medium water outlet is also in direct or indirect communication with a raw water user;
optionally, a spray tower demister is arranged on a flue gas channel between the spray tower water distribution device and the chimney;
optionally, a heat medium water circulating pump is arranged on a heat medium water pipeline which is directly or indirectly communicated with the spray tower heat medium water outlet or the spray tower heat medium water inlet;
Optionally, a high-temperature heat source water pump is arranged on the high-temperature heat source channel which is directly or indirectly communicated with the generator high-temperature heat source inlet or the generator high-temperature heat source outlet;
optionally, the flue heat exchanger working medium water outlet is also communicated with a heat user;
optionally, a cooling water reheater is connected in series with the condenser cooling water outlet;
optionally, a first desulfurizing tower is connected in series on the flue directly or indirectly communicated with the desulfurizing tower flue gas outlet or the desulfurizing tower flue gas outlet;
optionally, the flue heat exchanger working medium water outlet is directly or indirectly communicated with the generator high-temperature heat source inlet through a working medium water heater;
optionally, the high-temperature heat source outlet of the generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger through a cooler;
optionally, a cold water reheater is connected in series on a cold water channel directly or indirectly communicated with the condenser cooling water outlet.
2. The boiler flue gas waste heat recovery and utilization system according to claim 1, further comprising an air supply heater; the air supply heater is provided with an air supply heater air supply inlet, an air supply heater air supply outlet, an air supply heater working medium water inlet and an air supply heater working medium water outlet; the air supply channel of the air supply heater is connected in series with an air channel which is directly or indirectly communicated with the air supply inlet of the air supply device or the air supply outlet of the air supply device; the air supply outlet of the air supply heater is directly or indirectly communicated with the air supply inlet of the air preheater; the air supply heater is a dividing wall type heat exchanger; the working medium water channel of the air supply heater is connected in series with the working medium water channel between the high-temperature heat source outlet of the generator and the working medium water inlet of the flue heat exchanger; the high-temperature heat source outlet of the generator is directly or indirectly communicated with the working medium water inlet of the air supply heater; and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger.
3. The boiler flue gas waste heat recovery and utilization system according to claim 1, further comprising a first air supply heater; the first air supply heater is provided with a first air supply heater air supply inlet, a first air supply heater air supply outlet, a first air supply heater cold water inlet and a first air supply heater cold water outlet; the air supply channel of the first air supply heater is connected in series with an air channel which is directly or indirectly communicated with the air supply inlet of the air blower or the air supply outlet of the air blower; the air supply outlet of the first air supply heater is directly or indirectly communicated with the air supply inlet of the air preheater; the first air supply heater cold water inlet is directly or indirectly communicated with the condenser cooling water outlet; the first air supply heater cold water outlet is directly or indirectly communicated with the absorber cold water inlet; the first air supply heater is a dividing wall type heat exchanger; optionally, a cold water pump is arranged on a cold water channel which is directly or indirectly communicated with the cold water inlet of the absorber or the cold water outlet of the condenser.
4. The boiler flue gas waste heat recovery and utilization system according to claim 2, further comprising a first air supply heater; the first air supply heater is provided with a first air supply heater air supply inlet, a first air supply heater air supply outlet, a first air supply heater cold water inlet and a first air supply heater cold water outlet; the air supply channel of the first air supply heater is connected in series with an air channel which is directly or indirectly communicated with the air supply inlet of the air blower or the air supply outlet of the air blower; the air supply outlet of the first air supply heater is directly or indirectly communicated with the air supply inlet of the air supply heater; the first air supply heater cold water inlet is directly or indirectly communicated with the condenser cooling water outlet; the first air supply heater cold water outlet is directly or indirectly communicated with the absorber cold water inlet; the first air supply heater is a dividing wall type heat exchanger; optionally, a cold water pump is arranged on a cold water channel which is directly or indirectly communicated with the cold water inlet of the absorber or the cold water outlet of the condenser.
5. The boiler flue gas waste heat recovery and utilization system according to claim 1, further comprising a second air supply heater; the second air supply heater is provided with a second air supply heater air supply inlet, a second air supply heater air supply outlet, a second air supply heater heating medium water inlet and a second air supply heater heating medium water outlet; the air supply channel of the second air supply heater is connected in series with the air channel which is directly or indirectly communicated with the air supply inlet of the air blower or the air supply outlet of the air blower; the air supply outlet of the second air supply heater is directly or indirectly communicated with the air supply inlet of the air preheater; the second air supply heater heating medium water inlet is directly or indirectly communicated with the spray tower heating medium water outlet; the second air supply heater heating medium water outlet is directly or indirectly communicated with the spray tower heating medium water inlet; the second air supply heater is a dividing wall type heat exchanger.
6. The boiler flue gas waste heat recovery and utilization system according to claim 2, further comprising a second air supply heater; the second air supply heater is provided with a second air supply heater air supply inlet, a second air supply heater air supply outlet, a second air supply heater heating medium water inlet and a second air supply heater heating medium water outlet; the air supply channel of the second air supply heater is connected in series with the air channel which is directly or indirectly communicated with the air supply inlet of the air blower or the air supply outlet of the air blower; the air supply outlet of the second air supply heater is directly or indirectly communicated with the air supply inlet of the air supply heater; the second air supply heater heating medium water inlet is directly or indirectly communicated with the spray tower heating medium water outlet; the second air supply heater heating medium water outlet is directly or indirectly communicated with the spray tower heating medium water inlet; the second air supply heater is a dividing wall type heat exchanger.
7. The boiler flue gas waste heat recovery and utilization system according to claim 3, further comprising a second air supply heater; the second air supply heater is provided with a second air supply heater air supply inlet, a second air supply heater air supply outlet, a second air supply heater heating medium water inlet and a second air supply heater heating medium water outlet; the air supply channel of the second air supply heater is connected in series with the air channel which is directly or indirectly communicated with the air supply inlet of the air blower or the air supply outlet of the air blower; the second air supply heater air supply outlet is directly or indirectly communicated with the first air supply heater air supply inlet; the second air supply heater heating medium water inlet is directly or indirectly communicated with the spray tower heating medium water outlet; the second air supply heater heating medium water outlet is directly or indirectly communicated with the spray tower heating medium water inlet; the second air supply heater is a dividing wall type heat exchanger.
8. The system for recycling flue gas waste heat of a boiler according to claim 4, further comprising a second air supply heater; the second air supply heater is provided with a second air supply heater air supply inlet, a second air supply heater air supply outlet, a second air supply heater heating medium water inlet and a second air supply heater heating medium water outlet; the air supply channel of the second air supply heater is connected in series with the air channel which is directly or indirectly communicated with the air supply inlet of the air blower or the air supply outlet of the air blower; the second air supply heater air supply outlet is directly or indirectly communicated with the first air supply heater air supply inlet; the second air supply heater heating medium water inlet is directly or indirectly communicated with the spray tower heating medium water outlet; the second air supply heater heating medium water outlet is directly or indirectly communicated with the spray tower heating medium water inlet; the second air supply heater is a dividing wall type heat exchanger.
9. The system according to claim 1, wherein a third air heater is further connected in series to an air duct directly or indirectly connected to the air supply inlet or the air supply outlet of the blower; a first flue heat exchanger is arranged between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the desulfurizing tower; the third air supply heater is provided with a third air supply heater air supply inlet, a third air supply heater air supply outlet, a third air supply heater working medium water inlet and a third air supply heater working medium water outlet; the third air supply heater air supply outlet is directly or indirectly communicated with the air preheater air supply inlet; the third air supply heater is a dividing wall type heat exchanger; the first flue heat exchanger is provided with a first flue heat exchanger smoke inlet, a first flue heat exchanger smoke outlet, a first flue heat exchanger working medium water inlet and a first flue heat exchanger working medium water outlet; the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the first flue heat exchanger; the flue gas outlet of the first flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower; the first flue heat exchanger is a dividing wall type heat exchanger; the working medium water inlet of the third air supply heater is directly or indirectly communicated with the working medium water outlet of the first flue heat exchanger; the working medium water outlet of the third air supply heater is directly or indirectly communicated with the working medium water inlet of the first flue heat exchanger; optionally, a dust remover or/and an induced draft fan are connected in series on a flue gas channel between the flue heat exchanger and the first flue heat exchanger; optionally, a third working medium water circulating water pump is arranged on the working medium water channel directly or indirectly communicated with the working medium water outlet of the third air supply heater or the working medium water inlet of the third air supply heater.
10. The system according to claim 2, wherein a third air heater is further connected in series to an air duct directly or indirectly connected to the air supply inlet or the air supply outlet of the blower; a first flue heat exchanger is arranged between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the desulfurizing tower; the third air supply heater is provided with a third air supply heater air supply inlet, a third air supply heater air supply outlet, a third air supply heater working medium water inlet and a third air supply heater working medium water outlet; the third air supply heater air supply outlet is directly or indirectly communicated with the air preheater air supply inlet; the third air supply heater is a dividing wall type heat exchanger; the first flue heat exchanger is provided with a first flue heat exchanger smoke inlet, a first flue heat exchanger smoke outlet, a first flue heat exchanger working medium water inlet and a first flue heat exchanger working medium water outlet; the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the first flue heat exchanger; the flue gas outlet of the first flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower; the first flue heat exchanger is a dividing wall type heat exchanger; the working medium water inlet of the third air supply heater is directly or indirectly communicated with the working medium water outlet of the first flue heat exchanger; the working medium water outlet of the third air supply heater is directly or indirectly communicated with the working medium water inlet of the first flue heat exchanger; optionally, a dust remover or/and an induced draft fan are connected in series on a flue gas channel between the flue heat exchanger and the first flue heat exchanger; optionally, a third working medium water circulating water pump is arranged on the working medium water channel directly or indirectly communicated with the working medium water outlet of the third air supply heater or the working medium water inlet of the third air supply heater.
11. The system for recycling flue gas waste heat of boiler according to claim 3, wherein a third air supply heater is connected in series with an air duct directly or indirectly connected with the air supply inlet or the air supply outlet of the air supply device; a first flue heat exchanger is arranged between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the desulfurizing tower; the third air supply heater is provided with a third air supply heater air supply inlet, a third air supply heater air supply outlet, a third air supply heater working medium water inlet and a third air supply heater working medium water outlet; the third air supply heater air supply outlet is directly or indirectly communicated with the air preheater air supply inlet; the third air supply heater is a dividing wall type heat exchanger; the first flue heat exchanger is provided with a first flue heat exchanger smoke inlet, a first flue heat exchanger smoke outlet, a first flue heat exchanger working medium water inlet and a first flue heat exchanger working medium water outlet; the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the first flue heat exchanger; the flue gas outlet of the first flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower; the first flue heat exchanger is a dividing wall type heat exchanger; the working medium water inlet of the third air supply heater is directly or indirectly communicated with the working medium water outlet of the first flue heat exchanger; the working medium water outlet of the third air supply heater is directly or indirectly communicated with the working medium water inlet of the first flue heat exchanger; optionally, a dust remover or/and an induced draft fan are connected in series on a flue gas channel between the flue heat exchanger and the first flue heat exchanger; optionally, a third working medium water circulating water pump is arranged on the working medium water channel directly or indirectly communicated with the working medium water outlet of the third air supply heater or the working medium water inlet of the third air supply heater.
12. The system according to claim 4, wherein a third air heater is further connected in series to an air duct directly or indirectly connected to the air supply inlet or the air supply outlet of the blower; a first flue heat exchanger is arranged between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the desulfurizing tower; the third air supply heater is provided with a third air supply heater air supply inlet, a third air supply heater air supply outlet, a third air supply heater working medium water inlet and a third air supply heater working medium water outlet; the third air supply heater air supply outlet is directly or indirectly communicated with the air preheater air supply inlet; the third air supply heater is a dividing wall type heat exchanger; the first flue heat exchanger is provided with a first flue heat exchanger smoke inlet, a first flue heat exchanger smoke outlet, a first flue heat exchanger working medium water inlet and a first flue heat exchanger working medium water outlet; the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the first flue heat exchanger; the flue gas outlet of the first flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower; the first flue heat exchanger is a dividing wall type heat exchanger; the working medium water inlet of the third air supply heater is directly or indirectly communicated with the working medium water outlet of the first flue heat exchanger; the working medium water outlet of the third air supply heater is directly or indirectly communicated with the working medium water inlet of the first flue heat exchanger; optionally, a dust remover or/and an induced draft fan are connected in series on a flue gas channel between the flue heat exchanger and the first flue heat exchanger; optionally, a third working medium water circulating water pump is arranged on the working medium water channel directly or indirectly communicated with the working medium water outlet of the third air supply heater or the working medium water inlet of the third air supply heater.
13. The system according to claim 5, wherein a third air heater is further connected in series to an air duct directly or indirectly connected to the air supply inlet or the air supply outlet of the blower; a first flue heat exchanger is arranged between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the desulfurizing tower; the third air supply heater is provided with a third air supply heater air supply inlet, a third air supply heater air supply outlet, a third air supply heater working medium water inlet and a third air supply heater working medium water outlet; the third air supply heater air supply outlet is directly or indirectly communicated with the air preheater air supply inlet; the third air supply heater is a dividing wall type heat exchanger; the first flue heat exchanger is provided with a first flue heat exchanger smoke inlet, a first flue heat exchanger smoke outlet, a first flue heat exchanger working medium water inlet and a first flue heat exchanger working medium water outlet; the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the first flue heat exchanger; the flue gas outlet of the first flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower; the first flue heat exchanger is a dividing wall type heat exchanger; the working medium water inlet of the third air supply heater is directly or indirectly communicated with the working medium water outlet of the first flue heat exchanger; the working medium water outlet of the third air supply heater is directly or indirectly communicated with the working medium water inlet of the first flue heat exchanger; optionally, a dust remover or/and an induced draft fan are connected in series on a flue gas channel between the flue heat exchanger and the first flue heat exchanger; optionally, a third working medium water circulating water pump is arranged on the working medium water channel directly or indirectly communicated with the working medium water outlet of the third air supply heater or the working medium water inlet of the third air supply heater.
14. The system according to claim 6, wherein a third air heater is further connected in series to an air duct directly or indirectly connected to the air supply inlet or the air supply outlet of the blower; a first flue heat exchanger is arranged between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the desulfurizing tower; the third air supply heater is provided with a third air supply heater air supply inlet, a third air supply heater air supply outlet, a third air supply heater working medium water inlet and a third air supply heater working medium water outlet; the third air supply heater air supply outlet is directly or indirectly communicated with the air preheater air supply inlet; the third air supply heater is a dividing wall type heat exchanger; the first flue heat exchanger is provided with a first flue heat exchanger smoke inlet, a first flue heat exchanger smoke outlet, a first flue heat exchanger working medium water inlet and a first flue heat exchanger working medium water outlet; the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the first flue heat exchanger; the flue gas outlet of the first flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower; the first flue heat exchanger is a dividing wall type heat exchanger; the working medium water inlet of the third air supply heater is directly or indirectly communicated with the working medium water outlet of the first flue heat exchanger; the working medium water outlet of the third air supply heater is directly or indirectly communicated with the working medium water inlet of the first flue heat exchanger; optionally, a dust remover or/and an induced draft fan are connected in series on a flue gas channel between the flue heat exchanger and the first flue heat exchanger; optionally, a third working medium water circulating water pump is arranged on the working medium water channel directly or indirectly communicated with the working medium water outlet of the third air supply heater or the working medium water inlet of the third air supply heater.
15. The system according to claim 7, wherein a third air heater is further connected in series to an air duct directly or indirectly connected to the air supply inlet or the air supply outlet of the blower; a first flue heat exchanger is arranged between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the desulfurizing tower; the third air supply heater is provided with a third air supply heater air supply inlet, a third air supply heater air supply outlet, a third air supply heater working medium water inlet and a third air supply heater working medium water outlet; the third air supply heater air supply outlet is directly or indirectly communicated with the air preheater air supply inlet; the third air supply heater is a dividing wall type heat exchanger; the first flue heat exchanger is provided with a first flue heat exchanger smoke inlet, a first flue heat exchanger smoke outlet, a first flue heat exchanger working medium water inlet and a first flue heat exchanger working medium water outlet; the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the first flue heat exchanger; the flue gas outlet of the first flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower; the first flue heat exchanger is a dividing wall type heat exchanger; the working medium water inlet of the third air supply heater is directly or indirectly communicated with the working medium water outlet of the first flue heat exchanger; the working medium water outlet of the third air supply heater is directly or indirectly communicated with the working medium water inlet of the first flue heat exchanger; optionally, a dust remover or/and an induced draft fan are connected in series on a flue gas channel between the flue heat exchanger and the first flue heat exchanger; optionally, a third working medium water circulating water pump is arranged on the working medium water channel directly or indirectly communicated with the working medium water outlet of the third air supply heater or the working medium water inlet of the third air supply heater.
16. The system according to claim 8, wherein a third air heater is further connected in series to an air duct directly or indirectly connected to the air supply inlet or the air supply outlet of the blower; a first flue heat exchanger is arranged between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the desulfurizing tower; the third air supply heater is provided with a third air supply heater air supply inlet, a third air supply heater air supply outlet, a third air supply heater working medium water inlet and a third air supply heater working medium water outlet; the third air supply heater air supply outlet is directly or indirectly communicated with the air preheater air supply inlet; the third air supply heater is a dividing wall type heat exchanger; the first flue heat exchanger is provided with a first flue heat exchanger smoke inlet, a first flue heat exchanger smoke outlet, a first flue heat exchanger working medium water inlet and a first flue heat exchanger working medium water outlet; the flue gas outlet of the flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the first flue heat exchanger; the flue gas outlet of the first flue heat exchanger is directly or indirectly communicated with the flue gas inlet of the desulfurizing tower; the first flue heat exchanger is a dividing wall type heat exchanger; the working medium water inlet of the third air supply heater is directly or indirectly communicated with the working medium water outlet of the first flue heat exchanger; the working medium water outlet of the third air supply heater is directly or indirectly communicated with the working medium water inlet of the first flue heat exchanger; optionally, a dust remover or/and an induced draft fan are connected in series on a flue gas channel between the flue heat exchanger and the first flue heat exchanger; optionally, a third working medium water circulating water pump is arranged on the working medium water channel directly or indirectly communicated with the working medium water outlet of the third air supply heater or the working medium water inlet of the third air supply heater.
17. The boiler flue gas waste heat recovery and utilization system according to claim 1, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
18. The boiler flue gas waste heat recovery and utilization system according to claim 2, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the air supply heater, and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; or the first generator high-temperature heat source outlet is not communicated with the working medium water inlet of the air supply heater but is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
19. A boiler flue gas waste heat recovery and utilization system according to claim 3, further provided with a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
20. The boiler flue gas waste heat recovery and utilization system according to claim 4, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the air supply heater, and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; or the first generator high-temperature heat source outlet is not communicated with the working medium water inlet of the air supply heater but is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
21. The boiler flue gas waste heat recovery and utilization system according to claim 5, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
22. The boiler flue gas waste heat recovery and utilization system according to claim 6, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the air supply heater, and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; or the first generator high-temperature heat source outlet is not communicated with the working medium water inlet of the air supply heater but is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
23. The boiler flue gas waste heat recovery and utilization system according to claim 7, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
24. The boiler flue gas waste heat recovery and utilization system according to claim 8, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the air supply heater, and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; or the first generator high-temperature heat source outlet is not communicated with the working medium water inlet of the air supply heater but is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
25. The boiler flue gas waste heat recovery and utilization system according to claim 9, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
26. The boiler flue gas waste heat recovery and utilization system according to claim 10, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the air supply heater, and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; or the first generator high-temperature heat source outlet is not communicated with the working medium water inlet of the air supply heater but is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
27. The boiler flue gas waste heat recovery and utilization system according to claim 11, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
28. The boiler flue gas waste heat recovery and utilization system according to claim 12, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the air supply heater, and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; or the first generator high-temperature heat source outlet is not communicated with the working medium water inlet of the air supply heater but is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
29. The boiler flue gas waste heat recovery and utilization system according to claim 13, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
30. The boiler flue gas waste heat recovery and utilization system according to claim 14, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the air supply heater, and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; or the first generator high-temperature heat source outlet is not communicated with the working medium water inlet of the air supply heater but is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
31. The boiler flue gas waste heat recovery and utilization system according to claim 15, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
32. The boiler flue gas waste heat recovery and utilization system according to claim 16, further comprising a first absorption heat pump; the first absorption heat pump comprises a first evaporator, a first absorber, a first generator and a first condenser, wherein the first evaporator is provided with a first evaporator low-temperature heat source inlet, a first evaporator low-temperature heat source outlet, a first evaporator refrigerant water inlet and a first evaporator refrigerant water vapor outlet; the first absorber is provided with a first absorber cold water inlet, a first absorber cold water outlet, a first absorber refrigerant water vapor inlet, a first absorber concentrated absorbent solution inlet and a first absorber diluted absorbent solution outlet; the first generator is provided with a first generator high-temperature heat source inlet, a first generator high-temperature heat source outlet, a first generator dilute absorbent solution inlet, a first generator concentrated absorbent solution outlet and a first generator refrigerant water vapor outlet; the first condenser is provided with a first condenser cooling water inlet, a first condenser cooling water outlet, a first condenser refrigerant water vapor inlet and a first condenser refrigerant water outlet;
The first evaporator refrigerant water inlet is in direct or indirect communication with the first condenser refrigerant water outlet; the first evaporator refrigerant vapor outlet is in direct or indirect communication with the first absorber refrigerant vapor inlet; the first absorber concentrated absorbent solution inlet is in direct or indirect communication with the first generator concentrated absorbent solution outlet; the first absorber lean absorbent solution outlet is in direct or indirect communication with the first generator lean absorbent solution inlet; the first generator refrigerant vapor outlet is in direct or indirect communication with the first condenser refrigerant vapor inlet; the first absorber cold water outlet is directly or indirectly communicated with the first condenser cooling water inlet; the absorption heat pump forms a first type of absorption heat pump;
the spray tower heating medium water outlet is also directly or indirectly communicated with the low-temperature heat source inlet of the first evaporator; the low-temperature heat source outlet of the first evaporator is directly or indirectly communicated with the spray tower heat medium water inlet; the first generator high-temperature heat source channel is connected in series with the high-temperature driving heat source channel between the generator high-temperature heat source outlet and the flue heat exchanger working medium water inlet; the first generator high-temperature heat source inlet is directly or indirectly communicated with the generator high-temperature heat source outlet; the high-temperature heat source outlet of the first generator is directly or indirectly communicated with the working medium water inlet of the air supply heater, and the working medium water outlet of the air supply heater is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; or the first generator high-temperature heat source outlet is not communicated with the working medium water inlet of the air supply heater but is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the cold water channel of the first absorber and the first condenser which are connected in series is connected in series with the cold water channel of the cold water inlet of the absorber; the first condenser cooling water outlet is directly or indirectly communicated with the absorber cold water inlet; the first absorber cold water inlet is directly or indirectly communicated with a first air supply heater cold water outlet or/and a heat user.
33. The system of any one of claims 1-32, wherein the flue heat exchanger comprises a first stage flue heat exchange module and a second stage flue heat exchange module in series; the first-stage flue heat exchange module is provided with a flue heat exchanger flue gas inlet, a first-stage flue heat exchange module flue gas outlet, a first-stage flue heat exchange module working medium water inlet and a flue heat exchanger working medium water outlet; the second-stage flue heat exchange module is provided with a second-stage flue heat exchange module flue gas inlet, a flue heat exchanger flue gas outlet, a flue heat exchanger working medium water inlet and a second-stage flue heat exchange module working medium water outlet; the flue gas outlet of the first-stage flue heat exchange module is directly or indirectly communicated with the flue gas inlet of the second-stage flue heat exchange module through a dust remover or/and an induced draft fan, and the working medium water outlet of the second-stage flue heat exchange module is directly or indirectly communicated with the working medium water inlet of the first-stage flue heat exchange module.
34. The system according to any one of claims 1 to 32, further comprising a turbine high-medium pressure cylinder, a turbine low-pressure cylinder, a condenser, and a low-pressure heater; optionally, a deaerator, and/or a high pressure heater are also provided;
The steam turbine high-medium pressure cylinder is provided with a high-medium pressure cylinder steam inlet, a high-medium pressure cylinder steam outlet and a high-medium pressure cylinder steam extraction outlet;
the low-pressure cylinder of the steam turbine is provided with a low-pressure cylinder steam inlet, a low-pressure cylinder steam outlet and a low-pressure cylinder steam extraction outlet;
the condenser is provided with a condenser steam inlet and a condenser working medium water outlet;
the low-pressure heater is provided with a low-pressure heater working medium water inlet, a low-pressure heater working medium water outlet and a low-pressure heater steam extraction inlet;
the deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet;
the high-pressure heater is provided with a high-pressure heater working medium water inlet and a high-pressure heater working medium water outlet;
the boiler is also provided with a boiler steam outlet and a boiler working medium water inlet;
the boiler steam outlet is directly or indirectly communicated with the high-medium pressure cylinder steam inlet; the high-medium pressure cylinder steam outlet is directly or indirectly communicated with the low-pressure cylinder steam inlet; the low-pressure cylinder steam outlet is directly or indirectly communicated with the condenser steam inlet; the condenser working medium water outlet is directly or indirectly communicated with the low-pressure heater working medium water inlet and the flue heat exchanger working medium water inlet at the same time; the boiler working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet and the flue heat exchanger working medium water outlet at the same time; the low-pressure heater steam extraction inlet is directly or indirectly communicated with the low-pressure cylinder steam extraction outlet or/and the high-pressure cylinder steam extraction outlet;
Optionally, the boiler working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet through a high-pressure heater or/and a water feed pump or/and a deaerator;
optionally, the boiler working medium water inlet is directly or indirectly communicated with the flue heat exchanger working medium water outlet through a high-pressure heater or/and a water feeding pump or/and a deaerator;
optionally, a working medium water pump is arranged on a working medium water channel directly or indirectly communicated with the working medium water outlet of the condenser;
the low-pressure heater is one-stage or multi-stage low-pressure heater; the high-pressure heater is a one-stage or multi-stage high-pressure heater;
optionally, a heater or/and a working medium water pump or/and a buffer water tank are connected in series on a branch channel between the working medium water outlet of the condenser and the working medium water inlet of the flue heat exchanger;
optionally, a heater is connected in series between the flue heat exchanger working medium water outlet and the boiler working medium water inlet;
optionally, the condenser working medium water outlet is directly or indirectly communicated with the low-pressure heater working medium water inlet and the flue heat exchanger working medium water inlet through a first low-pressure heater; the first low-pressure heater is one-stage or multi-stage.
35. The system for recycling flue gas waste heat of a boiler according to claim 33, further comprising a turbine high-medium pressure cylinder, a turbine low-pressure cylinder, a condenser and a low-pressure heater; a deaerator and/or a high-pressure heater are also arranged;
the steam turbine high-medium pressure cylinder is provided with a high-medium pressure cylinder steam inlet, a high-medium pressure cylinder steam outlet and a high-medium pressure cylinder steam extraction outlet;
the low-pressure cylinder of the steam turbine is provided with a low-pressure cylinder steam inlet, a low-pressure cylinder steam outlet and a low-pressure cylinder steam extraction outlet;
the condenser is provided with a condenser steam inlet and a condenser working medium water outlet;
the low-pressure heater is provided with a low-pressure heater working medium water inlet, a low-pressure heater working medium water outlet and a low-pressure heater steam extraction inlet;
the deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet;
the high-pressure heater is provided with a high-pressure heater working medium water inlet and a high-pressure heater working medium water outlet;
the boiler is also provided with a boiler steam outlet and a boiler working medium water inlet;
the boiler steam outlet is directly or indirectly communicated with the high-medium pressure cylinder steam inlet; the high-medium pressure cylinder steam outlet is directly or indirectly communicated with the low-pressure cylinder steam inlet; the low-pressure cylinder steam outlet is directly or indirectly communicated with the condenser steam inlet; the condenser working medium water outlet is directly or indirectly communicated with the low-pressure heater working medium water inlet and the flue heat exchanger working medium water inlet at the same time; the boiler working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet and the flue heat exchanger working medium water outlet at the same time; the low-pressure heater steam extraction inlet is directly or indirectly communicated with the low-pressure cylinder steam extraction outlet or/and the high-pressure cylinder steam extraction outlet;
Optionally, the boiler working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet through a high-pressure heater or/and a water feed pump or/and a deaerator;
optionally, the boiler working medium water inlet is directly or indirectly communicated with the flue heat exchanger working medium water outlet through a high-pressure heater or/and a water feeding pump or/and a deaerator;
optionally, a working medium water pump is arranged on a working medium water channel directly or indirectly communicated with the working medium water outlet of the condenser;
the low-pressure heater is one-stage or multi-stage low-pressure heater; the high-pressure heater is a one-stage or multi-stage high-pressure heater;
optionally, a heater or/and a working medium water pump or/and a buffer water tank are connected in series on a branch channel between the working medium water outlet of the condenser and the working medium water inlet of the flue heat exchanger;
optionally, a heater is connected in series between the flue heat exchanger working medium water outlet and the boiler working medium water inlet;
optionally, the condenser working medium water outlet is directly or indirectly communicated with the low-pressure heater working medium water inlet and the flue heat exchanger working medium water inlet through a first low-pressure heater; the first low-pressure heater is one-stage or multi-stage.
36. The system according to any one of claims 1 to 32, wherein the spray tower is disposed above the desulfurizing tower, the desulfurizing tower and the spray tower are connected by a liquid collecting device to form a desulfurizing and spraying integrated structure, and the slurry pool, the desulfurizing tower flue gas inlet, the desulfurizing tower spray device, the liquid collecting device, the spray tower water distributing device and the spray tower flue gas outlet are disposed inside the desulfurizing and spraying integrated structure in this order from bottom to top; the liquid collecting device is of a multifunctional integrated structure comprising a flue gas outlet of the desulfurizing tower, a flue gas inlet of the spraying tower and a water receiving device of the spraying tower, flue gas from the desulfurizing tower can enter the spraying tower through the liquid collecting device, and heat medium water from the spraying tower falls into the liquid collecting device to be collected and is guided out of the liquid collecting device through the heat medium water outlet of the spraying tower so as not to flow into the desulfurizing tower; optionally, a filler layer is arranged between the liquid collecting device and the spray tower water distribution device.
37. The system according to claim 33, wherein the spray tower is disposed above the desulfurizing tower, the desulfurizing tower and the spray tower are connected by a liquid collecting device to form a desulfurizing and spraying integrated structure, and the slurry pool, the desulfurizing tower flue gas inlet, the desulfurizing tower spray device, the liquid collecting device, the spray tower water distributing device and the spray tower flue gas outlet are sequentially disposed inside the desulfurizing and spraying integrated structure from bottom to top; the liquid collecting device is of a multifunctional integrated structure comprising a flue gas outlet of the desulfurizing tower, a flue gas inlet of the spraying tower and a water receiving device of the spraying tower, flue gas from the desulfurizing tower can enter the spraying tower through the liquid collecting device, and heat medium water from the spraying tower falls into the liquid collecting device to be collected and is guided out of the liquid collecting device through the heat medium water outlet of the spraying tower so as not to flow into the desulfurizing tower; optionally, a filler layer is arranged between the liquid collecting device and the spray tower water distribution device.
38. The system according to claim 34, wherein the spray tower is disposed above the desulfurizing tower, the desulfurizing tower and the spray tower are connected by a liquid collecting device to form a desulfurizing and spraying integrated structure, and the slurry pool, the desulfurizing tower flue gas inlet, the desulfurizing tower spray device, the liquid collecting device, the spray tower water distributing device and the spray tower flue gas outlet are sequentially disposed inside the desulfurizing and spraying integrated structure from bottom to top; the liquid collecting device is of a multifunctional integrated structure comprising a flue gas outlet of the desulfurizing tower, a flue gas inlet of the spraying tower and a water receiving device of the spraying tower, flue gas from the desulfurizing tower can enter the spraying tower through the liquid collecting device, and heat medium water from the spraying tower falls into the liquid collecting device to be collected and is guided out of the liquid collecting device through the heat medium water outlet of the spraying tower so as not to flow into the desulfurizing tower; optionally, a filler layer is arranged between the liquid collecting device and the spray tower water distribution device.
39. The system according to claim 35, wherein the spray tower is disposed above the desulfurizing tower, the desulfurizing tower and the spray tower are connected by a liquid collecting device to form a desulfurizing and spraying integrated structure, and the slurry pool, the desulfurizing tower flue gas inlet, the desulfurizing tower spray device, the liquid collecting device, the spray tower water distributing device and the spray tower flue gas outlet are sequentially disposed inside the desulfurizing and spraying integrated structure from bottom to top; the liquid collecting device is of a multifunctional integrated structure comprising a flue gas outlet of the desulfurizing tower, a flue gas inlet of the spraying tower and a water receiving device of the spraying tower, flue gas from the desulfurizing tower can enter the spraying tower through the liquid collecting device, and heat medium water from the spraying tower falls into the liquid collecting device to be collected and is guided out of the liquid collecting device through the heat medium water outlet of the spraying tower so as not to flow into the desulfurizing tower; optionally, a filler layer is arranged between the liquid collecting device and the spray tower water distribution device.
40. The boiler flue gas waste heat recovery and utilization system according to claim 36, wherein the liquid collecting device is a liquid collecting and demisting integrated structure with demisting function, and the liquid collecting and demisting integrated structure comprises a liquid collecting chassis, a gas lifting pipe and a gas lifting cap; the liquid collecting chassis is provided with a plurality of vent holes, the vent holes are correspondingly provided with the gas lifting pipes, the top ends of the gas lifting pipes are provided with gas lifting caps, and gas lifting channels for the circulation of flue gas are arranged on the gas lifting caps or between the gas lifting caps and the top ends of the gas lifting pipes or on the pipe walls of the upper sections of the gas lifting pipes; a guide vane or a cyclone is arranged in the gas lift pipe, or/and a demisting pipe is connected below the gas lift pipe or arranged in the gas lift pipe, and the guide vane or the cyclone is arranged in the demisting pipe; the gas lifting pipe and the demisting pipe are of a split structure or an integrated structure; the liquid collecting chassis is provided with a water retaining edge or is in sealing combination with the inner wall of the tower body of the desulfurization spraying integrated structure and takes the inner wall of the desulfurization spraying integrated structure as the water retaining edge, an upward opening space enclosed between the liquid collecting chassis and the water retaining edge is used as a spray tower water receiving device, and the spray tower water receiving device is directly or indirectly communicated with a spray tower heating medium water outlet.
41. The boiler flue gas waste heat recovery and utilization system according to claim 37, wherein the liquid collecting device is a liquid collecting and demisting integrated structure with demisting function, and the liquid collecting and demisting integrated structure comprises a liquid collecting chassis, a gas lifting pipe and a gas lifting cap; the liquid collecting chassis is provided with a plurality of vent holes, the vent holes are correspondingly provided with the gas lifting pipes, the top ends of the gas lifting pipes are provided with gas lifting caps, and gas lifting channels for the circulation of flue gas are arranged on the gas lifting caps or between the gas lifting caps and the top ends of the gas lifting pipes or on the pipe walls of the upper sections of the gas lifting pipes; a guide vane or a cyclone is arranged in the gas lift pipe, or/and a demisting pipe is connected below the gas lift pipe or arranged in the gas lift pipe, and the guide vane or the cyclone is arranged in the demisting pipe; the gas lifting pipe and the demisting pipe are of a split structure or an integrated structure; the liquid collecting chassis is provided with a water retaining edge or is in sealing combination with the inner wall of the tower body of the desulfurization spraying integrated structure and takes the inner wall of the desulfurization spraying integrated structure as the water retaining edge, an upward opening space enclosed between the liquid collecting chassis and the water retaining edge is used as a spray tower water receiving device, and the spray tower water receiving device is directly or indirectly communicated with a spray tower heating medium water outlet.
42. The boiler flue gas waste heat recovery and utilization system according to claim 38, wherein the liquid collecting device is a liquid collecting and demisting integrated structure with demisting function, and the liquid collecting and demisting integrated structure comprises a liquid collecting chassis, a gas lifting pipe and a gas lifting cap; the liquid collecting chassis is provided with a plurality of vent holes, the vent holes are correspondingly provided with the gas lifting pipes, the top ends of the gas lifting pipes are provided with gas lifting caps, and gas lifting channels for the circulation of flue gas are arranged on the gas lifting caps or between the gas lifting caps and the top ends of the gas lifting pipes or on the pipe walls of the upper sections of the gas lifting pipes; a guide vane or a cyclone is arranged in the gas lift pipe, or/and a demisting pipe is connected below the gas lift pipe or arranged in the gas lift pipe, and the guide vane or the cyclone is arranged in the demisting pipe; the gas lifting pipe and the demisting pipe are of a split structure or an integrated structure; the liquid collecting chassis is provided with a water retaining edge or is in sealing combination with the inner wall of the tower body of the desulfurization spraying integrated structure and takes the inner wall of the desulfurization spraying integrated structure as the water retaining edge, an upward opening space enclosed between the liquid collecting chassis and the water retaining edge is used as a spray tower water receiving device, and the spray tower water receiving device is directly or indirectly communicated with a spray tower heating medium water outlet.
43. The system of claim 39, wherein the liquid collecting device is a liquid collecting and demisting integrated structure with demisting function, and the liquid collecting and demisting integrated structure comprises a liquid collecting chassis, a gas lifting pipe and a gas lifting cap; the liquid collecting chassis is provided with a plurality of vent holes, the vent holes are correspondingly provided with the gas lifting pipes, the top ends of the gas lifting pipes are provided with gas lifting caps, and gas lifting channels for the circulation of flue gas are arranged on the gas lifting caps or between the gas lifting caps and the top ends of the gas lifting pipes or on the pipe walls of the upper sections of the gas lifting pipes; a guide vane or a cyclone is arranged in the gas lift pipe, or/and a demisting pipe is connected below the gas lift pipe or arranged in the gas lift pipe, and the guide vane or the cyclone is arranged in the demisting pipe; the gas lifting pipe and the demisting pipe are of a split structure or an integrated structure; the liquid collecting chassis is provided with a water retaining edge or is in sealing combination with the inner wall of the tower body of the desulfurization spraying integrated structure and takes the inner wall of the desulfurization spraying integrated structure as the water retaining edge, an upward opening space enclosed between the liquid collecting chassis and the water retaining edge is used as a spray tower water receiving device, and the spray tower water receiving device is directly or indirectly communicated with a spray tower heating medium water outlet.
44. The system of claim 40, wherein the lift cap is a tower shutter structure, and the outer diameter of the lift cap and the outer diameter of the lift tube are both less than or equal to the inner diameter of the vent hole on the liquid collection chassis, and the lift tube and the lift cap are mounted in a detachable manner from the liquid collection chassis.
45. The system of claim 41, wherein the lift cap is a tower shutter structure, and the outer diameter of the lift cap and the outer diameter of the lift tube are smaller than or equal to the inner diameter of the vent hole on the liquid collection chassis, and the lift tube and the lift cap are mounted in a detachable manner from the liquid collection chassis.
46. The system of claim 42, wherein the lift cap is a tower shutter structure, and the outer diameter of the lift cap and the outer diameter of the lift tube are both less than or equal to the inner diameter of the vent hole on the liquid collection chassis, and the lift tube and the lift cap are mounted in a detachable manner from the liquid collection chassis.
47. The system of claim 43, wherein the lift cap is a tower shutter structure, and the outer diameter of the lift cap and the outer diameter of the lift tube are smaller than or equal to the inner diameter of the vent hole on the liquid collection chassis, and the lift tube and the lift cap are mounted in a detachable manner from the liquid collection chassis.
48. The system of any one of claims 1-32, wherein the flue heat exchanger is a tubular heat exchanger, a heat pipe heat exchanger, or a series of a heat pipe heat exchanger and a tubular heat exchanger.
49. The boiler flue gas waste heat recovery system of claim 33, wherein the flue heat exchanger is a tubular heat exchanger, a heat pipe heat exchanger, or a series of a heat pipe heat exchanger and a tubular heat exchanger.
50. The boiler flue gas waste heat recovery system of claim 34, wherein the flue heat exchanger is a tubular heat exchanger, a heat pipe heat exchanger, or a series of a heat pipe heat exchanger and a tubular heat exchanger.
51. The boiler flue gas waste heat recovery system of claim 36, wherein the flue heat exchanger is a tubular heat exchanger, a heat pipe heat exchanger, or a series of a heat pipe heat exchanger and a tubular heat exchanger.
52. The system of claim 40, wherein the flue heat exchanger is a tubular heat exchanger, a heat pipe heat exchanger, or a series of a heat pipe heat exchanger and a tubular heat exchanger.
53. The boiler flue gas waste heat recovery system of claim 44, wherein the flue heat exchanger is a tubular heat exchanger, a heat pipe heat exchanger, or a series of a heat pipe heat exchanger and a tubular heat exchanger.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220169415 | 2022-01-21 | ||
| CN2022201694151 | 2022-01-21 |
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| Publication Number | Publication Date |
|---|---|
| CN220186862U true CN220186862U (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221723371.9U Active CN220186862U (en) | 2022-01-21 | 2022-07-06 | Boiler flue gas waste heat recovery utilizes system |
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| Country | Link |
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| CN (1) | CN220186862U (en) |
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- 2022-07-06 CN CN202221723371.9U patent/CN220186862U/en active Active
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