CN219199227U - Boiler flue gas waste heat recovery utilizes system - Google Patents
Boiler flue gas waste heat recovery utilizes system Download PDFInfo
- Publication number
- CN219199227U CN219199227U CN202220190728.5U CN202220190728U CN219199227U CN 219199227 U CN219199227 U CN 219199227U CN 202220190728 U CN202220190728 U CN 202220190728U CN 219199227 U CN219199227 U CN 219199227U
- Authority
- CN
- China
- Prior art keywords
- medium water
- working medium
- outlet
- inlet
- flue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 330
- 239000003546 flue gas Substances 0.000 title claims abstract description 323
- 239000002918 waste heat Substances 0.000 title claims abstract description 104
- 238000011084 recovery Methods 0.000 title claims abstract description 59
- 239000007921 spray Substances 0.000 claims abstract description 310
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 137
- 238000004064 recycling Methods 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 904
- 239000007788 liquid Substances 0.000 claims description 150
- 238000010438 heat treatment Methods 0.000 claims description 108
- 238000005507 spraying Methods 0.000 claims description 88
- 239000007789 gas Substances 0.000 claims description 87
- 239000002002 slurry Substances 0.000 claims description 56
- 238000000605 extraction Methods 0.000 claims description 48
- 238000006477 desulfuration reaction Methods 0.000 claims description 43
- 230000023556 desulfurization Effects 0.000 claims description 43
- 238000001816 cooling Methods 0.000 claims description 36
- 239000012530 fluid Substances 0.000 claims description 29
- 239000000779 smoke Substances 0.000 claims description 28
- 238000004891 communication Methods 0.000 claims description 18
- 239000000428 dust Substances 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 10
- 238000012856 packing Methods 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 5
- 230000003134 recirculating effect Effects 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims 7
- 239000003344 environmental pollutant Substances 0.000 abstract description 11
- 231100000719 pollutant Toxicity 0.000 abstract description 11
- 206010015137 Eructation Diseases 0.000 description 29
- 238000000034 method Methods 0.000 description 13
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 11
- 230000009467 reduction Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 239000002245 particle Substances 0.000 description 8
- 238000010248 power generation Methods 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 7
- 238000009833 condensation Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 7
- 238000004146 energy storage Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000007791 dehumidification Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000003097 mucus Anatomy 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Air Supply (AREA)
- Treating Waste Gases (AREA)
Abstract
A boiler flue gas waste heat recycling system. The boiler flue gas waste heat recovery utilizes system includes: the system comprises a boiler, an air preheater, a flue heat exchanger, a first flue heat exchanger, a desulfurizing tower, a spray tower, a chimney, a blower, an air supply heater, a first air supply heater and a heat user. 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. However, 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 due to the low heat energy quality of the conventional flue gas waste heat recovery technology.
Disclosure of Invention
In order to solve the above problems, the present utility model provides a boiler flue gas waste heat recycling system, comprising: the system comprises a boiler, an air preheater, a flue heat exchanger, a first flue heat exchanger, a desulfurizing tower, a spray tower, a chimney, a blower, an air supply heater, a first air supply heater and a heat user; 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 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 heat medium water inlet and a first flue heat exchanger heat medium water outlet; the first 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; optionally, a spray tower demister is arranged between the spray tower water distribution device and the chimney;
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, and 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 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 blower is provided with a blower inlet and a blower outlet;
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 heating medium water inlet and an air supply heater heating medium water outlet; the air supply heater is a dividing wall type heat exchanger;
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 heating medium water inlet and a first air supply heater heating medium water outlet; the first air supply heater is a dividing wall type heat exchanger;
the air supply outlet of the air supply heater is directly or indirectly communicated with the air supply inlet of the air supply machine; the air supply outlet of the blower is directly or indirectly communicated with the air supply inlet of the first air supply heater; 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 air supply outlet of the air preheater is directly or indirectly communicated with the air supply inlet of the boiler;
the heat user is provided with a heat user working medium water inlet and a heat user working medium water outlet;
the spray tower heating medium water outlet is directly or indirectly communicated with the air supply heater heating medium water inlet, the air supply heater heating medium water outlet is directly or indirectly communicated with the spray tower heating medium water inlet, the first flue heat exchanger heating medium water outlet is directly or indirectly communicated with the first air supply heater heating medium water inlet, and the first air supply heater heating medium water outlet is directly or indirectly communicated with the first flue heat exchanger heating medium water inlet; or the spray tower heating medium water outlet is directly or indirectly communicated with the first flue heat exchanger heating medium water inlet, the first flue heat exchanger heating medium water outlet is directly or indirectly communicated with the first air supply heater heating medium water inlet, the first air supply heater heating medium water outlet is directly or indirectly communicated with the air supply heater heating medium water inlet, and the air supply heater heating medium water outlet is directly or indirectly communicated with the spray tower heating medium water inlet;
The flue heat exchanger working medium water outlet is directly or indirectly communicated with the heat user working medium water inlet, and the heat user working medium water outlet is directly or indirectly communicated with the flue heat exchanger working medium water inlet; the heat user is a terminal heat user which finally uses heat energy for consumption, such as a heating heat user and a turbine condensation water system, or an intermediate heat user which plays an intermediate isolation role, such as an isolation heat exchanger;
optionally, the flue heat exchanger working medium water outlet is also directly or indirectly communicated with a hot water user;
optionally, a dust remover or/and an induced draft fan are connected in series between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the first flue heat exchanger;
optionally, the flue heat exchanger and the first flue heat exchanger are of a flue heat exchanger integrated structure. The flue gas outlet of the flue heat exchanger is directly communicated with the flue gas inlet of the first flue heat exchanger; the first flue heat exchanger heat medium water outlet is a middle tap of a heat medium water channel of the flue heat exchanger integrated structure;
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.
The dividing wall type heat exchanger is also called a surface type heat exchanger, which means that cold side medium and hot side medium of the heat exchanger 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 tube type heat exchangers, plate type heat exchangers and the like; or indirectly exchanging heat through wall surfaces such as heat exchange tube walls or heat exchange plate walls and an intermediate heat exchange medium, such as a heat pipe type heat exchanger (a hot side medium transfers heat to the intermediate medium in the heat pipe through a hot end tube wall of the heat pipe, and the intermediate medium transfers heat to a cold side medium through a cold end tube wall of the heat pipe).
The blower is various blowers which supply oxygen required for combustion to the air supply in the boiler, such as a blower in a power plant or/and a primary blower;
the boiler is a device for burning fuel to emit heat and generating smoke;
preferably, in the boiler flue gas waste heat recycling system, the flue heat exchanger comprises two or more groups of flue heat exchange modules, and each flue heat exchange module is provided with a flue heat exchange module working medium water inlet and a flue heat exchange module working medium water outlet;
the flue heat exchanger also comprises a working medium water recirculation pump; the working medium water recirculation pump is provided with a working medium water recirculation pump inlet and a working medium water recirculation pump outlet; the flue heat exchange module working medium water outlets of the flue heat exchange modules are directly or indirectly communicated with the flue heat exchanger working medium water outlets; all the flue heat exchange module working medium water inlets are directly or indirectly communicated with the flue heat exchanger working medium water inlets through flue heat exchange module inlet valves; the working medium water outlet of the flue heat exchanger or the working medium water outlet of the flue heat exchange module is directly or indirectly communicated with the inlet of the working medium water recirculation pump; at least one flue heat exchange module working medium water inlet is directly or indirectly communicated with the working medium water recirculation pump outlet through a flue heat exchange module recirculation valve; optionally, a working medium water reheater is connected in series at the inlet or outlet of the working medium water recirculating pump; or,
The flue heat exchanger also comprises a working medium water pump; the working medium water pump is provided with a working medium water pump inlet and a working medium water pump outlet; the working medium water pump outlet is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the flue heat exchange module working medium water outlets of the flue heat exchange modules are directly or indirectly communicated with the flue heat exchanger working medium water outlets; all the flue heat exchange module working medium water inlets are directly or indirectly communicated with the flue heat exchanger working medium water inlets through flue heat exchange module inlet valves; at least one flue heat exchange module working medium water inlet is directly or indirectly communicated with the working medium water pump inlet through a flue heat exchange module recycling valve.
Preferably, in the boiler flue gas waste heat recycling system, a flue heat exchanger working medium water flow adjusting device is arranged on a working medium water channel which is directly or indirectly communicated with a flue heat exchanger working medium water inlet or/and a flue heat exchanger working medium water outlet; optionally, the flue heat exchanger working medium water flow adjusting device is a valve or a water pump; or/and the first flue heat exchanger heat medium water inlet or/and the heat medium water channel directly or indirectly communicated with the first flue heat exchanger heat medium water outlet are provided with a first flue heat exchanger heat medium water flow adjusting device; optionally, the first flue heat exchanger heat medium water flow adjusting device is a valve or a water pump; optionally, a slurry buffer device is further provided, and the slurry buffer device is directly or indirectly communicated with the slurry pool of the desulfurizing tower.
Preferably, in the boiler flue gas waste heat recycling system, a cooling tower is arranged between the spray tower heating medium water inlet and the air supply heater heating medium water outlet; the cooling tower is provided with a cooling tower inlet and a cooling tower outlet; the air supply heater heat medium water outlet is directly or indirectly communicated with the cooling tower inlet; the cooling tower outlet is directly or indirectly communicated with the spray tower heating medium water inlet;
optionally, the cooling tower is a natural draft tower or a mechanical draft tower.
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 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, heating 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 heating medium water outlet of the spraying tower, so that the heating medium water cannot 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 filler layer is arranged between the liquid collecting device and the spray tower water distributing device;
preferably, in the boiler flue gas waste heat recycling system, a spray tower spraying device is arranged between the spray tower water receiving device and the spray tower water distribution device, and the spray tower spraying device is directly or indirectly communicated with the spray tower water receiving device through a spray tower circulating pump; optionally, a spray tower heat medium water buffer device is arranged between the spray tower water receiving device and the spray tower circulating pump.
Preferably, in the boiler flue gas waste heat recycling system, the heat user is a steam turbine system; the turbine system includes: the system comprises a turbine high-medium pressure cylinder, a turbine low-pressure cylinder, a condenser, a condensate pump, a low-pressure heater, a first pressurizing heater, a deaerator and a high-pressure heater;
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 condensate pump is provided with a condensate pump inlet and a condensate pump 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 first low-pressure heater is provided with a first low-pressure heater working medium water inlet and a first low-pressure heater working medium water outlet; the first low-pressure heater working medium outlet is also used as the heat user working medium water outlet;
the deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet; the deaerator working medium water inlet is also used as the heat user working medium water inlet;
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 condensate pump inlet; the condensate pump outlet is directly or indirectly communicated with the working medium water inlet of the first low-pressure heater; the first low-pressure heater working medium water outlet is directly or indirectly communicated with the low-pressure heater working medium water inlet, and simultaneously, the first low-pressure heater working medium water outlet is directly or indirectly communicated with the flue heat exchanger working medium water inlet as the heat user working medium water outlet; the deaerator working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet, and simultaneously, the deaerator working medium water inlet is used as a heat user working medium water inlet to be directly or indirectly communicated with the flue heat exchanger working medium water outlet; the deaerator working medium water outlet is directly or indirectly communicated with the high-pressure heater working medium water inlet; the high-pressure heater working medium water outlet is directly or indirectly communicated with the boiler working medium water inlet; 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;
The low-pressure heater is one-stage or multi-stage; the first low-pressure heater is one-stage or multi-stage; the high-pressure heater is one-stage or multi-stage high-pressure heater.
Optionally, a working medium water buffer water tank and a working medium water booster pump are arranged between the working medium water outlet of the first low-pressure heater and the working medium water inlet of the flue heat exchanger.
Preferably, in the boiler flue gas waste heat recycling system, the air supply inlet of the blower is also provided with an air control baffle which is directly or indirectly communicated with the atmosphere.
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. 2-1 is a schematic structural view of an embodiment of a flue heat exchanger in the boiler flue gas waste heat recovery system of the present utility model.
Fig. 2-2 are schematic structural views of another embodiment of a flue heat exchanger in 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 diagram of the structure of one embodiment of the desulfurizing tower and the spray tower in the boiler flue gas waste heat recovery and utilization system of the present utility model.
Fig. 6 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. 6a and 6b are schematic structural views of an embodiment of a guide vane.
Fig. 6-1 is a schematic view of another embodiment of a liquid collecting device.
Fig. 6-2 is a schematic view of another embodiment of a liquid collecting device.
Fig. 7 is a schematic view of another embodiment of a liquid collecting device.
FIG. 7-1 is a schematic view of the structure of one embodiment of the lift cap of the liquid collection device.
Fig. 8 is a schematic structural view of another embodiment of a desulfurizing tower and a spray tower in the system for recovering and utilizing waste heat of flue gas of a boiler according to the present utility model.
Fig. 9 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
Fig. 10 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
Fig. 11 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
Fig. 11-1 is a schematic structural view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
Fig. 12 is a schematic view of another embodiment of the boiler flue gas waste heat recovery system of 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. a 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;
22-5 flue heat exchange modules;
22-5-1 flue heat exchange module working medium water inlet;
22-5-2 flue heat exchange module working medium water outlets;
22-5-3 flue heat exchange module inlet valve;
a recycling valve of the 22-5-4 flue heat exchange module;
22-6 working medium water recirculation pumps;
22-6-1 working medium water recirculation pump inlet;
22-6-2 working medium water recirculation pump outlet;
22-7 working medium water reheater;
22-8 working medium water pumps;
22-8-1 working medium water pump inlet;
22-8-2 working medium water pump outlet;
22-15 flue heat exchanger working medium water flow adjusting device;
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 a first flue heat exchanger heat medium water inlet;
5-4 a first flue heat exchanger heat medium water outlet;
5-5 a first flue heat exchanger heating medium water flow adjusting device;
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;
6-9 slurry buffer devices;
7. a chimney;
8. a blower;
8-1 blower inlet;
8-2 blower air outlet;
8-3 air control baffle
9. A first air supply heater;
9-1 a first supply air heater supply air inlet;
9-2 a first air supply heater air supply outlet;
9-3 a first air supply heater heating medium water inlet;
9-4 a first air supply heater heating medium water outlet;
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 pipe
12-16 packing layers
12-17 spray tower spray device
12-18 spray tower circulating pump
13. A cooling tower;
13-1 cooling tower inlet;
13-2 cooling tower outlet;
40. a hot user;
40-1 hot user working medium water inlet;
40-2 a hot user working medium water outlet;
35. raw water source device;
36. raw water users;
60-dust remover;
61-induced draft fan;
80. an air supply heater;
80-1 air supply heater air supply inlet;
80-2 air supply outlets of the air supply heater;
80-3 a hot medium water inlet of an air supply heater;
80-4 a hot medium water outlet of an air supply heater;
25. A high-medium pressure cylinder 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 the 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. a 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. a deaerator;
29-1 working medium water inlet of deaerator;
29-2 working medium water outlet of deaerator;
30. a high pressure heater;
30-1 working medium water inlet of high-pressure heater;
30-2 working medium water outlet of high-pressure heater;
90. first low-pressure heater
90-1 a working medium water inlet of a first low-pressure heater;
90-2 a working medium water outlet of a first low-pressure heater;
91. a condensate pump;
91-1 condensate pump inlet;
91-2 condensate pump outlets;
92. working medium water buffer water tank;
93. working medium water pressurizing water pump;
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, first flue heat exchanger 5, desulfurizing tower 6, spray tower 12, chimney 7, blower 8, blower heater 80, first blower heater 9, and heat consumer 40; 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 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 heat medium water inlet 5-3 and a first flue heat exchanger heat medium water outlet 5-4; the first flue heat exchanger is a dividing wall type heat exchanger;
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 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 boiler flue gas outlet 1-3 is directly or indirectly communicated with the air preheater flue gas inlet 2-1; the air preheater flue gas outlet 2-2 is directly or indirectly communicated with the flue heat exchanger flue gas inlet 22-1, and the flue heat exchanger flue gas outlet 22-2 is directly or indirectly communicated with the first flue heat exchanger flue gas inlet 5-1; 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 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, and the flue gas outlet 12-2 of the spraying tower is directly or indirectly communicated with the chimney 7;
The blower 8 is provided with a blower inlet 8-1 and a blower outlet 8-2;
the air supply heater 80 is provided with an air supply heater air supply inlet 80-1, an air supply heater air supply outlet 80-2, an air supply heater heat medium water inlet 80-3 and an air supply heater heat medium water outlet 80-4; the air supply heater 80 is a dividing wall type heat exchanger.
The first air supply heater 9 is provided with a first air supply heater air supply inlet 9-1, a first air supply heater air supply outlet 9-2, a first air supply heater heat medium water inlet 9-3 and a first air supply heater heat medium water outlet 9-4; the first air supply heater is a dividing wall type heat exchanger;
the air supply outlet 80-2 of the air supply heater is directly or indirectly communicated with the air supply inlet 8-1 of the air supply machine; the blower air outlet 8-2 is directly or indirectly communicated with the first air supply heater air inlet 9-1; the first air supply heater air supply outlet 9-2 is directly or indirectly communicated with the air preheater air supply 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 heat user is provided with a heat user working medium water inlet 40-1 and a heat user working medium water outlet 40-2;
The spray tower heat medium water outlet 12-4 is directly or indirectly communicated with the air supply heater heat medium water inlet 80-3, and the air supply heater heat medium water outlet 80-4 is directly or indirectly communicated with the spray tower heat medium water inlet 12-3;
the first flue heat exchanger heat medium water outlet 5-4 is directly or indirectly communicated with the first air supply heater heat medium water inlet 9-3; the first air supply heater heat medium water outlet 9-4 is directly or indirectly communicated with the first flue heat exchanger heat medium water inlet 5-3;
the flue heat exchanger working fluid water outlet 22-4 is directly or indirectly communicated with the heat user working fluid water inlet 40-1, and the heat user working fluid water outlet 40-2 is directly or indirectly communicated with the flue heat exchanger working fluid water inlet 22-3; the heat consumer 40 may be an end-use heat consumer that consumes heat energy, such as a heating heat consumer, a turbine condensate system, or an intermediate heat consumer that acts as an intermediate separator, such as a heat exchanger that acts as an separator.
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 first flue heat exchanger 5, 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, flue gas flows out from the flue gas outlet 2-2 of the air preheater and then enters the flue gas channel of the flue heat exchanger 22 through the flue heat exchanger flue gas inlet 22-1 directly or after passing through other devices, heating (including heating through heat exchange tube walls or heat exchange plate walls, or heating through heat exchange tube walls or heat exchange plate walls and an intermediate medium, and the like) the working medium water in the working medium water channel flowing through the flue heat exchanger 22, the flue gas flows out of the flue heat exchanger flue gas outlet 22-2 after being cooled down, then enters the flue gas channel of the first flue heat exchanger 5 directly or after passing through other devices (such as a dust remover 60 or/and an induced draft fan 61) through the first flue heat exchanger flue gas inlet 5-1, heating (including heating through heat exchange tube walls or heat exchange plate walls, the flue gas is cooled and flows out of a flue gas outlet 5-2 of the first flue heat exchanger and flows into a desulfurizing tower 6, the desulfurized saturated or nearly saturated flue gas enters a spray tower 12 through a spray tower flue gas inlet 12-1, the heat medium water from a heating medium water outlet 80-4 of an air supply heater is conveyed to a spray tower water distribution device 12-6 through a 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, and the saturated flue gas is further cooled, dehumidified and washed and is discharged into the atmosphere through a spray tower flue gas outlet 12-2 and a chimney 7.
The heat medium water in the spray tower 12 absorbs the sensible heat of flue gas, the vaporization latent heat of water vapor condensation and the temperature after the reaction heat in the desulfurization process are raised, the heat medium water is directly or indirectly sent to the air supply heater heat medium water inlet 80-3 through the spray tower heat medium water outlet 12-4 after being collected by the spray tower water receiving device 12-5, enters the heat medium water channel of the air supply heater 80, and the air supply (air) enters the air supply channel of the air supply heater 80 through the air supply heater air supply inlet 80-1 under the suction driving of the air supply blower 8, the temperature after the heat medium water in the air supply heater 80 heat the air supply channel is reduced, and then flows out through the air supply heater heat medium water outlet 80-4 and returns to the spray tower heat medium water inlet 12-3 for recycling.
The heat medium water from the heat medium water outlet 9-4 of the first air supply heater enters the heat medium water channel of the first flue heat exchanger 5 through the heat medium water inlet 5-3 of the first flue heat exchanger, is heated and warmed by the flue gas flowing through the flue gas channel of the first flue heat exchanger 5, enters the heat medium water channel of the first air supply heater 9 through the heat medium water outlet 5-4 of the first flue heat exchanger and the heat medium water inlet 9-3 of the first air supply heater, cools after heating the air flowing through the air supply channel of the first air supply heater 9, flows out through the heat medium water outlet 9-4 of the first air supply heater, and returns to the heat medium water inlet 5-3 of the first flue heat exchanger for recycling.
Under the drive of the blower 8, the air supply is heated and warmed up by the air supply heater 80 and the first air supply heater 9 in sequence, the air supply with the temperature increased enters the air preheater 2 through the air preheater air supply inlet 2-3 and is further warmed up and then is sent into the hearth of the boiler 1 through the air preheater air supply outlet 2-4, 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 high-efficiency 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 of 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 of the flue heat exchanger increases, the waste heat of the flue gas flowing through the flue heat exchanger 22 (including through the wall or the wall of the heat exchanger or through the wall or the wall of the heat exchanger and the medium between the two, etc.) increases, the temperature increases, and the heated flue gas is sent to the heat user 40 for use through the flue heat exchanger working medium water outlet 22-4 and the heat user working medium water inlet 40-1, and returns to the flue heat exchanger working medium water inlet 22-3 after the heat user 40 exchanges heat and cools, and the cycle is thus performed. 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, the embodiment not only recovers the flue gas waste heat at the outlet of the air preheater, but also recovers and converts the low-temperature flue gas waste heat which is difficult to utilize before and after the desulfurizing tower into high-grade heat energy, thereby realizing the full recovery and high-efficiency utilization of the flue gas waste heat. In general, the temperature of the flue gas at the inlet of the desulfurizing tower 6 is about 90 ℃, 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 after mixed heat exchange between the spray tower 12 and the flue gas can be increased to about 40 ℃, the temperature of the air supply of the hot medium water after heating by the air supply heater can be increased to about 35 ℃, the pressurizing temperature of the air supply can be increased by 3-10 ℃ by the air supply machine, then the flue gas is heated to about 60 ℃ by the first air supply heater, under the condition that the temperature of the air supply outlet 2-4 of the air preheater is increased due to the increase of the air supply inlet 2-3 of the air preheater (if the income is counted to be better), the flue gas temperature of the air outlet 2-2 of the air preheater is increased on the basis of 120 ℃, considering conservation of heat, the heat increment realized by the temperature rise of the flue gas outlet 2-2 of the air preheater is equal to the sum of the flue gas waste heat absorbed by the heat medium water from the spray tower 12 and the flue gas waste heat absorbed by the heat medium water from the first flue heat exchanger 5, namely, the low-grade flue gas waste heat at about 50 ℃ at the outlet of the desulfurizing tower 6 and the low-grade flue gas waste heat at about 90 ℃ at the inlet of the desulfurizing tower 6 are converted into high-grade flue gas heat at about 120 ℃ or above through the spray tower 12, the air supply heater 80, the first flue heat exchanger 5, the first air supply heater 9 and the air preheater 2, so that the heat energy quality of working medium water at the working medium water outlet 22-4 of the flue heat exchanger is improved, the conversion from the low-grade flue gas waste heat to the high-grade heat is realized, and the recovery efficiency and the utilization efficiency of the flue gas waste heat 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 energy of the desulfurized saturated flue gas is characterized by low grade and high density. The spray tower has the advantages of high heat exchange efficiency, no end difference, small outlet water temperature change (phase change heat exchange), small equipment investment and the like, but has low outlet water temperature. Since the temperature of the air blown by the blower is raised after being pressurized, the air blowing heater 80 is provided at the blower air blowing inlet 8-1, and the air blowing temperature at the air blowing heater inlet is low, and under the same condition, the heat medium water from the spray tower 12 can transfer more heat to the air blown. Meanwhile, the air temperature of the outlet of the air supply heater is generally below 50 ℃, and the influence on the output and the power consumption of the air supply machine is small.
The first flue heat exchanger 5 adopts dividing wall heat exchange, so that higher outlet water temperature can be obtained. The first air supply heater 9 is arranged on the air supply channel between the air supply outlet 8-2 of the air supply fan and the air supply inlet 2-3 of the air preheater, and mainly aims at that the temperature of the heat medium water from the first flue heat exchanger 5 is higher, and the arrangement of the first air supply heater at the air supply inlet has great influence on the output and the power consumption of the air supply fan.
Flue gas from the air preheater 2 sequentially passes through the flue heat exchanger 22, the first flue heat exchanger 5 and the spray tower 12 to recover flue gas waste heat in a echelon manner; the temperature of the heating medium water at the heating medium water outlet 12-4 of the spray tower is lower, and the spray tower is used for heating the air supply at the inlet of the blower with lower temperature; the heat medium water outlet 5-4 of the first flue heat exchanger has higher temperature and is used for heating the air supply of the outlet of the blower with higher temperature. Is favorable for fully recovering the flue gas waste heat and efficiently utilizing the flue gas waste heat, and is favorable for reducing heat exchange loss.
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.
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.
The blast heater 80 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 80-1 of the air supply heater is low, the cooling capacity of the air supply heater 80 to the heat medium water is improved, the temperature of the air supply heater heat medium water outlet 80-3 is reduced, the condensation cooling of the heat medium water to the smoke in the spray tower 12 is increased, the smoke plume regulating effect of the chimney is enhanced, and pollutants in the smoke 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 air supply heater 80 to the heat medium water increases, the temperature of the air supply heater heat medium water outlet 80-4 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 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.
The blower is a variety of blowers that provide oxygen required for combustion to the supply air within the boiler, such as blowers and/or primary blowers in a power plant.
The boiler refers to a device that burns fuel to emit heat and generates flue gas.
The heat user can be a terminal heat user which finally uses heat energy for consumption, such as a heating heat user, a turbine condensation water system and the like; it can also be an intermediate heat consumer that acts as an intermediate isolation, such as an isolation heat exchanger. When the middle user is an isolation heat exchanger, the isolation heat exchanger is divided into a hot side channel and a cold side channel which are isolated from each other, working medium water at a working medium water outlet 22-4 of the flue heat exchanger is introduced into the hot side channel, a heat exchange medium of a terminal heat user is introduced into the cold side channel, and the working medium water transfers heat to the heat exchange medium of the terminal heat user through the hot side channel of the isolation heat exchanger. The purpose of adopting the isolation heat exchanger is to prevent the leakage of the flue heat exchanger from polluting the terminal heat user.
Optionally, a dust remover 60 and/or an induced draft fan 61 are/is connected in series between the flue heat exchanger flue gas outlet 22-2 and the first flue heat exchanger flue gas inlet 5-1. 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 flue heat exchanger 22 and the first flue heat exchanger 5 are a flue heat exchanger integrated structure. The flue gas outlet 22-2 of the flue heat exchanger is directly communicated with the flue gas inlet 5-1 of the first flue heat exchanger; the first flue heat exchanger heat medium water outlet 5-4 is a middle tap of a heat medium water channel of the flue heat exchanger integrated structure;
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, the flue heat exchanger working fluid water outlet 22-4 is also in direct or indirect communication with a hot water user (not shown); the hot water user refers to a user consuming hot water, and the working medium water at the working medium water outlet 22-4 of the flue heat exchanger is consumed after being sent to the hot water user and is not returned to the working medium water inlet 22-3 of the flue heat exchanger.
Optionally, a spray tower demister is arranged between the spray tower water distribution device 12-6 and the chimney 7.
In addition, in actual use, a heat medium water driving water pump or/and a heat medium water buffer device (not shown) can be arranged on the heat medium water channel directly or indirectly communicated with the heat medium water inlet 80-3 of the air supply heater or the heat medium water outlet 80-4 of the air supply heater; and a heat medium water driving water pump and/or a heat medium water buffer device (not shown) can be further arranged on the heat medium water channel which is directly or indirectly communicated with the heat medium water inlet 9-3 of the first air supply heater or the heat medium water outlet 9-4 of the first air supply heater.
The dividing wall type heat exchanger is also called a surface type heat exchanger, which means that cold side medium and hot side medium of the heat exchanger 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 tube type heat exchangers, plate type heat exchangers and the like; or indirectly exchanging heat through wall surfaces such as heat exchange tube walls or heat exchange plate walls and an intermediate heat exchange medium, such as a heat pipe type heat exchanger (a hot side medium transfers heat to the intermediate medium in the heat pipe through a hot end tube wall of the heat pipe, and the intermediate medium transfers heat to a cold side medium through a cold end tube wall of the heat pipe).
In the present embodiment, the heat medium water in the spray tower 12 and the heat medium water used in the first flue heat exchanger 5 are different.
Fig. 2-1 is a schematic diagram of an embodiment of a flue heat exchanger 22 in the boiler flue gas waste heat recovery system of the present utility model.
As shown in fig. 2-1, the flue heat exchanger 22 includes two or more groups of flue heat exchange modules 22-5, and each flue heat exchanger module 22-5 is provided with a flue heat exchange module working medium water inlet 22-5-1 and a flue heat exchange module working medium water outlet 22-5-2. The working medium water inlets 22-5-1 of the flue heat exchange modules are directly or indirectly communicated with the working medium water inlets 22-3 of the flue heat exchanger through the inlet valves 22-5-3 of the flue heat exchange modules; the flue heat exchange module working medium water outlets 22-5-2 of the flue heat exchange modules 22-5 are directly or indirectly communicated with the flue heat exchanger working medium water outlets 22-4;
The flue heat exchanger 22 also includes a working fluid water recirculation pump 22-6. The working fluid water recirculation pump 22-6 is provided with a working fluid water recirculation pump inlet 22-6-1 and a working fluid water recirculation pump outlet 22-6-2.
The working medium water outlet 22-4 of the flue heat exchanger is directly or indirectly communicated with the working medium water recirculation pump inlet 22-6-1; at least one flue heat exchange module working fluid water inlet 22-5-1 is directly or indirectly communicated with the working fluid water recirculation pump outlet 22-6-2 through a flue heat exchange module recirculation valve 22-5-4.
The working principle is as follows:
the flue heat exchange module 22-5 absorbs the heat of the flue gas through working medium water. When a certain flue heat exchange module 22-5 is scaled or pollutants such as ammonium bisulfate are deposited, the inlet valve 22-5-3 of the flue heat exchange module can be closed in a staged manner, the corresponding recycling valve 22-5-4 of the flue heat exchange module is correspondingly opened, and high-temperature working medium water at the working medium water outlet 22-4 of the flue heat exchanger is pressurized by the working medium water recycling pump 22-6 to be pumped into the working medium water inlet 22-5-1 of the flue heat exchange module and flows through the working medium water channel of the flue heat exchange module 22-5 to be recycled to the working medium water outlet 22-5-2 of the flue heat exchange module until reaching the working medium water outlet 22-4 of the flue heat exchanger. The high-temperature working medium water heats the heat exchange channel, the heat exchange at the flue gas side is weakened, the wall temperature of the heat exchange element is increased, ammonium bisulfate or other deposits in deposits or scaling substances on the heat exchange element can be dissolved or sublimated, and the deposits and scaling substances of the heat exchange element of the heat medium water heat exchange module can be stripped under the cooperation of the soot blower, so that the problems of blockage of the deposits such as ammonium bisulfate of a flue heat exchanger, scaling due to other low-temperature corrosion and the like are solved. Optionally, a working fluid water reheater 22-7 is connected in series with the inlet or outlet of the working fluid water recirculation pump 22-6. When the temperature of the working medium water at the outlet 22-4 of the flue heat exchanger is insufficient, the working medium water can be heated by the working medium water reheater 22-7. The working medium water reheater 22-7 can adopt a flue gas heater or a steam heater or a hot water heater.
When the temperature of the working medium water at the working medium water outlet 22-4 of the flue heat exchanger is higher, the working medium water reheater is not required.
Fig. 2-2 are schematic structural views of another embodiment of a flue heat exchanger 22 in the boiler flue gas waste heat recovery system of the present utility model.
As shown in fig. 2-2, the flue heat exchanger 22 includes two or more groups of flue heat exchange modules 22-5, and each flue heat exchanger module 22-5 is provided with a flue heat exchange module working medium water inlet 22-5-1 and a flue heat exchange module working medium water outlet 22-5-2. The working medium water inlets 22-5-1 of the flue heat exchange modules are directly or indirectly communicated with the working medium water inlets 22-3 of the flue heat exchanger through the inlet valves 22-5-3 of the flue heat exchange modules; the flue heat exchange module working medium water outlets 22-5-2 of the flue heat exchange modules 22-5 are directly or indirectly communicated with the flue heat exchanger outlets 22-4;
the flue heat exchanger 22 also includes a working fluid water pump 22-8. The working medium water pump 22-8 is provided with a working medium water pump inlet 22-8-1 and a working medium water pump outlet 22-8-2. The working medium water pump outlet 22-8-2 is directly or indirectly communicated with the flue heat exchanger working medium water inlet 22-3; at least one flue heat exchange module working medium water inlet 22-5-1 is directly or indirectly communicated with the working medium water pump inlet 22-8-1 through a flue heat exchange module recycling valve 22-5-4.
The working principle is as follows:
the flue heat exchange module 22-5 absorbs the heat of the flue gas through working medium water. When a certain flue heat exchange module 22-5 is scaled or pollutants such as ammonium bisulfate are deposited, the inlet valve 22-5-3 of the flue heat exchange module can be closed in a staged manner, the corresponding recycling valve 22-5-4 of the flue heat exchange module is correspondingly opened, and high-temperature working medium water at the working medium water outlet 22-4 of the flue heat exchanger is pumped and driven by the working medium water pump 22-8 to flow back into the working medium water channel of the flue heat exchange module 22-5 to the working medium water inlet 22-5-1 of the flue heat exchange module through the working medium water outlet 22-5-2 of the flue heat exchange module, and flows through the working medium water recycling valve 22-5-4 of the flue heat exchange module to the working medium water pump inlet 22-8-1. The high-temperature working medium water heats the heat exchange channel, the heat exchange at the flue gas side is weakened, the wall temperature of the heat exchange element is increased, ammonium bisulfate or other deposits in deposits or scaling substances on the heat exchange element can be dissolved or sublimated, and under the cooperation of a soot blower, the deposits and scaling substances of the heat exchange element of the heat medium water heat exchange module can be stripped, so that the problems of ammonium bisulfate blockage and other deposits of a flue heat exchanger and other low-temperature corrosion scaling and the like are solved.
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, the working medium water outlet 22-4 (or the working medium water inlet 22-3 of the flue heat exchanger, not shown in the figure) of the flue heat exchanger is directly or indirectly connected with a working medium water channel, and the working medium water flow regulator 22-15 of the flue heat exchanger is arranged on the working medium water channel; optionally, the flue heat exchanger working medium water flow adjusting device 22-15 is a valve or a water pump; or/and, a first flue heat exchanger heat medium water flow adjusting device 5-5 is arranged on a heat medium water channel which is directly or indirectly communicated with the first flue heat exchanger heat medium water outlet 5-4 (or the first flue heat exchanger heat medium water inlet 5-3 is not shown in the figure); optionally, the first flue heat exchanger heat medium water flow adjusting device 5-5 is a valve or a water pump; optionally, a slurry buffer device 6-9 is provided in direct or indirect communication with the slurry pond of the desulfurizing tower.
The flow rate of the working medium flowing through the flue heat exchanger is regulated by a flue heat exchanger working medium flow rate regulating device 22-15; or/and, adjusting the flow of the heating medium flowing through the first flue heat exchanger by adjusting the heating medium flow adjusting device 5-5 of the first flue heat exchanger. Energy storage can be achieved.
The working principle is as follows:
the liquid level of the desulfurizing tower slurry tank 6-3 is allowed to fluctuate, and a certain limited range is also provided, namely, the liquid level of the desulfurizing tower slurry tank 6-3 is allowed to fluctuate. Energy storage stage: when the load of the heat user is low or the income is low, the absorption capacity of the working medium water to the flue gas waste heat is reduced by reducing the flow rate of the working medium water flowing through the flue heat exchanger 22, or/and the absorption capacity of the heating medium water to the flue gas waste heat is reduced by reducing the flow rate of the heating medium water flowing through the first flue heat exchanger 5, and the part of the flue gas waste heat is used for evaporating the desulfurization slurry. The flue gas temperature at the inlet of the desulfurizing tower 6 is maintained at a high level, the flue gas temperature and heat in the desulfurizing tower 6 are improved, the moisture evaporation amount of the desulfurizing slurry in the desulfurizing tower 6 is increased, and when the moisture evaporation amount of the desulfurizing slurry in the desulfurizing tower 6 plus the total water inflow amount of the desulfurizing slurry discharged outside the desulfurizing tower is larger than that of the desulfurizing tower 6, the water level of the desulfurizing slurry pool 6-3 of the desulfurizing tower is reduced, namely, the moisture of the desulfurizing slurry is evaporated by utilizing the flue gas waste heat, the liquid level of the slurry pool 6-3 is reduced, the 'storage capacity' of the slurry pool 6-3 is discharged, and the desulfurizing slurry pool is reserved for being used when the heat load is high or the income is high. Energy release stage: when the load of heat users is high or the income is high, the water flow rate of working media flowing through the flue heat exchanger 22 is increased, or/and the water flow rate of heat media flowing through the first flue heat exchanger 5 is/are increased, the absorption capacity of heat media water to flue gas waste heat is increased, the recovery capacity of flue gas waste heat is increased as much as possible for external heat supply, the flue gas temperature at the inlet of the desulfurizing tower 6 is kept low, when the evaporation capacity of water content of desulfurizing slurry in the desulfurizing tower 6 plus the outward discharge capacity of the desulfurizing slurry is smaller than the total water inflow capacity of the desulfurizing tower 6, the water level of the slurry pool 6-3 of the desulfurizing tower is increased, namely, the 'storage capacity' of the slurry pool 6-3 vacated in the energy storage stage is utilized, namely, the flue gas heat required to evaporate the water content of the desulfurizing slurry for maintaining the liquid level of the slurry pool 6-3 is transferred for external heat supply. Thereby, the energy storage and energy release process of the flue gas waste heat is completed by utilizing the allowable liquid level fluctuation range of the slurry pond 6-3 and the phase change process of the desulfurization slurry moisture, and the desulfurization tower slurry pond 6-3 is changed into a phase change energy storage device. The method has the advantages of large energy storage capacity, long caching time, no energy conversion loss and no increase of occupied area. The energy-saving carbon-reduction pollution-reduction energy-saving system can cooperate to realize long-time energy-saving transformation of large capacity in the transformation of energy conservation, carbon reduction and pollution reduction by relying on the characteristics of large total scale base number and huge energy-saving transformation potential of the traditional thermal power generating unit, thereby realizing low investment, low running cost and fundamental adjustment of an energy structure.
When the flow adjusting device adopts a valve, the investment is small, but throttling loss exists; when the water pump is adopted, the investment is high, but the energy is saved.
In fig. 3, a slurry buffer device 6-9 directly or indirectly connected with the slurry tank 6-3 of the desulfurizing tower 6 can be further arranged to increase the volume and allowable capacity (or weight) fluctuation range of the slurry tank of the desulfurizing tower, and increase the energy storage capacity and time, the energy release capacity and time.
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 the embodiment shown in fig. 3, a cooling tower 13 is arranged between the spray tower heating medium water inlet 12-3 and the air supply heater heating medium water outlet 80-4; the cooling tower 13 is provided with a cooling tower inlet 13-1 and a cooling tower outlet 13-2. The air supply heater heat medium water outlet 80-4 is directly or indirectly communicated with the cooling tower inlet 13-1; the cooling tower outlet 13-2 is in direct or indirect communication with the spray tower heating medium water inlet 12-3. Optionally, the cooling tower is a natural draft tower or a mechanical draft tower.
The purpose of the cooling tower 13 is to: when the temperature reduction range of the heating medium water at the heating medium water outlet 80-4 of the air supply heater cannot meet the temperature reduction and dehumidification requirements of the spray tower 12 due to environmental temperature change or air supply amount change, the heating medium water is sent to the cooling tower 13 adopting mixed heat exchange, and the temperature of the heating medium water can be further reduced, so that the effects of deep temperature reduction, dehumidification, emission reduction, moisture recovery, chimney smoke plume phenomenon reduction and the like of the flue gas can be realized.
Fig. 5 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. 5, 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 desulfurizing and spraying integrated structure is internally provided with a slurry pool 6-3, a desulfurizing tower flue gas inlet 6-5, a desulfurizing tower spraying device 6-6, a desulfurizing tower demister 6-7, a liquid collecting device 12-7, a spraying tower water distributing device 12-6 and a spraying tower flue gas outlet 12-2 from bottom to top.
The liquid collecting device is of a multifunctional integrated structure comprising a flue gas outlet 6-4 of the desulfurizing tower, a flue gas inlet 12-1 of the spraying tower and a 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 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. 6 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. 6, 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. 6a and 6b are schematic structural views of an embodiment of the guide vanes); the liquid collecting chassis 12-8 is provided with a water retaining edge 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, the inner wall of the desulfurization spraying integrated structure is used as a water retaining edge 12-14, an upward opening space enclosed between the liquid collecting chassis 12-8 and the water retaining edge 12-14 is used as a spray tower water receiving device 12-5, and the spray tower water receiving device 12-5 is communicated with a 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 12-6, 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. 6-1, 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. 6-2, 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. 7 is a schematic view of another embodiment of the liquid collection device 12-7 in the boiler flue gas waste heat recovery system of the present utility model.
FIG. 7-1 is a schematic view of the structure of one embodiment of the lift cap of the liquid collection device.
Based on FIG. 6, as shown in FIG. 7 and FIG. 7-1, the lift cap 12-9 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 12-9; 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. 8 is a schematic structural view of another embodiment of a desulfurizing tower and a spray tower in the system for recovering and utilizing waste heat of flue gas of a boiler according to the present utility model.
As shown in FIG. 8, on the basis of FIG. 5, 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. 9 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. 9, on the basis of fig. 3, a spray tower spraying device 12-17 is arranged between the spray tower water receiving device 12-5 and the spray tower water distribution device 12-6, and the spray tower spraying device 12-17 is directly or indirectly communicated with the spray tower water receiving device 12-5 through a spray tower circulating pump 12-18;
the working process is as follows:
the heat medium water from the spray tower water receiving device 12-5 enters the spray tower spraying device 12-17 under the driving of the spray tower circulating pump 12-18, and the spray tower spraying device 12-17 sprays the heat medium water into the flue gas and then falls into the spray tower water receiving device 12-5 downwards for recycling. The flue gas after spray heat exchange by the spray tower spray device 12-17 is further washed and cooled by the low-temperature heat medium water sprayed by the spray tower water distribution device 12-6, and the temperature and humidity of the flue gas can be further reduced due to the fact that the temperature of the heat medium water from the heat medium water outlet 80-4 of the air supply heater is lower and the heat medium water is sprayed into the flue gas by the spray tower water distribution device 12-6. The advantages are that: the heat exchange between the heat medium water and the flue gas can be enhanced by the circulating spray heat exchange of the spray tower spray device 12-17, and the heat medium water flow of the spray tower circulating pump 12-18 is not limited by the heat medium water flow of the air supply heater 80, so that the heat exchange effect can be improved, and the heat medium water temperature of the heat medium water outlet of the spray tower can be improved. The flue gas is further sprayed and cooled by the spray tower water distribution device 12-6 positioned above, so that the temperature and humidity of the flue gas can be further reduced, and the gradient cooling and heat exchange of the heat medium water on the flue gas are realized.
Optionally, a spray tower heat medium water buffer device (not shown in the figure) is arranged between the spray tower water receiving device and the spray tower circulating pump;
fig. 10 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. 10, the spray tower heat medium water outlet 12-4 is directly or indirectly communicated with the first flue heat exchanger heat medium water inlet 5-3; the first flue heat exchanger heat medium water outlet 5-4 is directly or indirectly communicated with the first air supply heater heat medium water inlet 9-3; the first air supply heater heat medium water outlet 9-4 is directly or indirectly communicated with the air supply heater heat medium water inlet 80-3; the air supply heater heat medium water outlet 80-4 is directly or indirectly communicated with the spray tower heat medium water inlet 12-3.
The working process is as follows:
the heat medium water mixed with the flue gas in the spray tower 12 is sent to the heat medium water inlet 5-3 of the first flue heat exchanger through the heat medium water outlet 12-4 of the spray tower, after the heat medium water is subjected to heat exchange with the flue gas partition wall in the first flue heat exchanger 5 and further heated, the heat medium water is sent to the heat medium water inlet 9-3 of the first air supply heater through the heat medium water outlet 5-4 of the first flue heat exchanger, after the heat medium water is subjected to heat exchange and temperature reduction with the air supply flowing through the first air supply heater 9, the heat medium water is sent to the heat medium water inlet 80-3 of the air supply heater through the heat exchange and temperature reduction of the air supply flowing through the air supply heater 80, and then is sent to the heat medium water inlet 12-3 of the spray tower through the heat medium water outlet 80-4 of the air supply heater, and is recycled. And then the heat medium water and the air supply heat exchange in a gradient manner, and the air supply heat exchange in a gradient manner and the heat medium water heat exchange in a gradient manner.
Fig. 11 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. 11, the heat user in the boiler flue gas waste heat recycling system is a steam turbine system. The turbine system includes: a steam turbine high-medium pressure cylinder 25, a steam turbine low-pressure cylinder 26, a condenser 27, a condensate pump 91, a low-pressure heater 28, a first low-pressure heater 90, 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 condensate pump is provided with a condensate pump inlet 91-1 and a condensate pump outlet 91-2;
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 first low-pressure heater 90 is provided with a first low-pressure heater working medium water inlet 90-1 and a first low-pressure heater working medium water outlet 90-2; the first low pressure heater working fluid outlet 90-2 also serves as the hot user working fluid water outlet 40-2;
The deaerator 29 is provided with a deaerator working medium water inlet 29-1 and a deaerator working medium water outlet 29-2; the deaerator working medium water inlet 29-1 is simultaneously used as the heat user working medium water inlet 40-1;
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 directly or indirectly communicated with the condensate pump inlet 91-1; the condensate pump outlet 91-2 is directly or indirectly communicated with the first low-pressure heater working medium water inlet 90-1; the first low-pressure heater working fluid water outlet 90-2 is directly or indirectly communicated with the low-pressure heater working fluid water inlet 28-1, and the first low-pressure heater working fluid water outlet 90-2 is directly or indirectly communicated with the flue heat exchanger working fluid water inlet 22-3 as the heat user working fluid water outlet 40-2; the deaerator working medium water inlet 29-1 is directly or indirectly communicated with the low-pressure heater working medium water outlet 28-2, and meanwhile, the deaerator working medium water inlet 29-1 is used as a heat user working medium water inlet 40-1 to be directly or indirectly communicated with the flue heat exchanger working medium water outlet 22-4; 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 discharged into a condenser 27 after the steam turbine high-medium pressure cylinder 25 and the steam turbine low-pressure cylinder 26 work in sequence, the pressure and the temperature are reduced, the steam is cooled by the condenser 27 and condensed into working medium water (condensed water), the working medium water is sent to a first low-pressure heater 90 under the driving of a condensed water pump 91, the working medium water is heated and warmed by the first low-pressure heater 90, one path of the working medium water is sent to a low-pressure heater 28, the working medium water is heated and warmed in the low-pressure heater 28 by utilizing the extraction steam from the steam turbine low-pressure cylinder 26 or/and part of the extraction steam of the high-medium pressure cylinder, and the working medium water after the temperature is warmed is sent to a deaerator 29 for deaeration; the other path of working medium water serving as a heat user working medium water outlet 40-2 enters the flue heat exchanger 22 through a flue heat exchanger working medium water inlet 22-3 and is heated by utilizing flue gas waste heat, the warmed working medium water flows out of the flue heat exchanger 22 through a flue heat exchanger working medium water outlet 22-4, and enters the deaerator 29 for deaeration through the heat user working medium water inlet 40-1, namely a deaerator working medium water inlet 29-1; 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.
The low-pressure heater is one-stage or multi-stage; the first low-pressure heater is one-stage or multi-stage; the high-pressure heater is one-stage or multi-stage. The low pressure cylinder extraction and the high and medium pressure cylinder extraction are also generally multistage. 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. 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 of the deaerator after being reheated by a low-pressure heater at one stage or more.
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 into high-temperature high-grade heat energy, the heat energy is utilized to heat working medium water from the first low-pressure heater 90, the temperature of the working medium water with higher temperature can be obtained, 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 and generate electricity, the electricity generation coal consumption can be greatly reduced, and the electricity generation capacity can be increased; the part of the extracted steam can be extracted from the high-medium pressure cylinder to supply heat to the outside, thereby reducing the cold end loss of the steam turbine, improving the heat supply capacity, the thermoelectric ratio and the flexibility and reducing the comprehensive power generation coal consumption. The minimum steam inflow of the low-pressure cylinder can be reduced, the minimum stable electric load capacity of the generator set is reduced, the electric load lowering capacity is improved, the proportion of the maximum heating capacity of the generator set to the minimum stable electric load is further improved, and the thermoelectric ratio, peak shaving capacity and flexibility of the generator set are further improved. Moreover, the power generation capacity and the heat supply capacity provided by the embodiment can be mutually compensated, mutually shifted, mutually standby and peak-staggering adjustment, for example, the power consumption peak is more power generation and less heat supply, and the power supply peak is more heat supply and less power generation, so that the problem of difficulty in heating and fixing power or heating power in the operation scheduling of thermoelectric load is solved, real thermoelectric decoupling is realized, and the overall working efficiency of the system, the reliability and the flexibility of the system are improved.
Therefore, the embodiment can be used for improving the heat supply capacity, the power generation capacity, the thermoelectric ratio, the peak shaving capacity and the flexibility of the thermal power plant, and realizing the application project of thermal decoupling and the like.
As shown in fig. 11-1, optionally, a working fluid water buffer tank 92 and a working fluid water booster pump 93 may be disposed between the first low-pressure heater working fluid water outlet 90-2 and the flue heat exchanger working fluid water inlet 22-3.
Fig. 12 is a schematic view of another embodiment of the boiler flue gas waste heat recovery system of the present utility model.
As shown in fig. 12, the blower inlet 8-1 is further provided with an air control baffle 8-3 which communicates directly or indirectly with the atmosphere. The function of the air control baffle 8-3 is opened when the heating amount transmitted to the air supply by the air supply heater 80 is insufficient to offset the power consumption of the air supply fan 8 with increased air channel resistance of the air supply heater 80, and the air supply inlet 8-1 of the air supply fan is communicated with the atmosphere, so that the resistance of the air channel of the air supply inlet of the air supply fan is reduced, and the power consumption of the air supply fan 8 is reduced. When the heater 80 delivers a higher amount of heat to the air than the blower 8 with increased resistance to the air passage of the heater 80 is powered, the air control damper 8-3 is closed.
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 (50)
1. A boiler flue gas waste heat recovery system, comprising: the system comprises a boiler, an air preheater, a flue heat exchanger, a first flue heat exchanger, a desulfurizing tower, a spray tower, a chimney, a blower, an air supply heater, a first air supply heater and a heat user; 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 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 heat medium water inlet and a first flue heat exchanger heat medium water outlet; the first 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, a spray tower demister is arranged between the spray tower water distribution device and the chimney;
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, and 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 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 blower is provided with a blower inlet and a blower outlet;
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 heating medium water inlet and an air supply heater heating medium water outlet; the air supply heater is a dividing wall type heat exchanger;
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 heating medium water inlet and a first air supply heater heating medium water outlet; the first air supply heater is a dividing wall type heat exchanger;
The air supply outlet of the air supply heater is directly or indirectly communicated with the air supply inlet of the air supply machine; the air supply outlet of the blower is directly or indirectly communicated with the air supply inlet of the first air supply heater; 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 air supply outlet of the air preheater is directly or indirectly communicated with the air supply inlet of the boiler;
the heat user is provided with a heat user working medium water inlet and a heat user working medium water outlet;
the spray tower heating medium water outlet is directly or indirectly communicated with the air supply heater heating medium water inlet, the air supply heater heating medium water outlet is directly or indirectly communicated with the spray tower heating medium water inlet, the first flue heat exchanger heating medium water outlet is directly or indirectly communicated with the first air supply heater heating medium water inlet, and the first air supply heater heating medium water outlet is directly or indirectly communicated with the first flue heat exchanger heating medium water inlet; or the spray tower heating medium water outlet is directly or indirectly communicated with the first flue heat exchanger heating medium water inlet, the first flue heat exchanger heating medium water outlet is directly or indirectly communicated with the first air supply heater heating medium water inlet, the first air supply heater heating medium water outlet is directly or indirectly communicated with the air supply heater heating medium water inlet, and the air supply heater heating medium water outlet is directly or indirectly communicated with the spray tower heating medium water inlet;
The flue heat exchanger working medium water outlet is directly or indirectly communicated with the heat user working medium water inlet, and the heat user working medium water outlet is directly or indirectly communicated with the flue heat exchanger working medium water inlet; the heat user is a terminal heat user which consumes heat energy finally or an intermediate heat user which plays an intermediate isolation role;
optionally, the flue heat exchanger working medium water outlet is also directly or indirectly communicated with a hot water user;
optionally, a dust remover or/and an induced draft fan are connected in series between the flue gas outlet of the flue heat exchanger and the flue gas inlet of the first 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.
2. The system for recycling the waste heat of the flue gas of the boiler according to claim 1, wherein a flue heat exchanger working medium water flow adjusting device is arranged on a working medium water channel which is directly or indirectly communicated with a flue heat exchanger working medium water inlet or/and a flue heat exchanger working medium water outlet; or/and the first flue heat exchanger heat medium water inlet or/and the heat medium water channel directly or indirectly communicated with the first flue heat exchanger heat medium water outlet are provided with a first flue heat exchanger heat medium water flow adjusting device; optionally, a slurry buffer device is further provided, and the slurry buffer device is directly or indirectly communicated with the slurry pool of the desulfurizing tower.
3. The boiler flue gas waste heat recovery and utilization system according to claim 1, wherein a cooling tower is arranged between the spray tower heat medium water inlet and the air supply heater heat medium water outlet; the cooling tower is provided with a cooling tower inlet and a cooling tower outlet; the air supply heater heat medium water outlet is directly or indirectly communicated with the cooling tower inlet; the cooling tower outlet is directly or indirectly communicated with the spray tower heat medium water inlet.
4. The boiler flue gas waste heat recovery and utilization system according to claim 2, wherein a cooling tower is arranged between the spray tower heat medium water inlet and the air supply heater heat medium water outlet; the cooling tower is provided with a cooling tower inlet and a cooling tower outlet; the air supply heater heat medium water outlet is directly or indirectly communicated with the cooling tower inlet; the cooling tower outlet is directly or indirectly communicated with the spray tower heat medium water inlet.
5. The boiler flue gas waste heat recycling system according to claim 1, wherein the spray tower is arranged above the desulfurization tower, the desulfurization tower and the spray tower are connected through a liquid collecting device to form a desulfurization spray integrated structure, and the slurry pool, the flue gas inlet of the desulfurization tower, the spray device of the desulfurization tower, the liquid collecting device of the spray tower, the water distributing device of the spray tower and the flue gas outlet of the spray tower are arranged in the desulfurization spray integrated structure from bottom to top in sequence; 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, heating 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 heating medium water outlet of the spraying tower, so that the heating medium water cannot flow into the desulfurizing tower.
6. The boiler flue gas waste heat recycling system according to claim 2, wherein the spray tower is arranged above the desulfurization tower, the desulfurization tower and the spray tower are connected through a liquid collecting device to form a desulfurization spray integrated structure, and the slurry pool, the flue gas inlet of the desulfurization tower, the spray device of the desulfurization tower, the liquid collecting device of the spray tower, the water distributing device of the spray tower and the flue gas outlet of the spray tower are arranged in the desulfurization spray integrated structure from bottom to top in sequence; 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.
7. The boiler flue gas waste heat recycling system according to claim 3, wherein the spray tower is arranged above the desulfurization tower, the desulfurization tower and the spray tower are connected through a liquid collecting device to form a desulfurization spray integrated structure, and the slurry pool, the flue gas inlet of the desulfurization tower, the spray device of the desulfurization tower, the liquid collecting device of the spray tower, the water distributing device of the spray tower and the flue gas outlet of the spray tower are arranged in the desulfurization spray integrated structure from bottom to top in sequence; 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.
8. The system according to claim 4, 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 flue gas inlet of the desulfurizing tower, the spraying device of the desulfurizing tower, the liquid collecting device, the water distributing device of the spraying tower and the flue gas outlet of the spraying tower are sequentially disposed inside the desulfurizing and spraying 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.
9. The boiler flue gas waste heat recovery and utilization system according to claim 5, wherein 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.
10. The boiler flue gas waste heat recovery and utilization system according to claim 6, 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.
11. The boiler flue gas waste heat recovery and utilization system according to claim 7, wherein 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.
12. The boiler flue gas waste heat recovery and utilization system according to claim 8, wherein 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.
13. The system of claim 9, wherein the lift cap is a tower-type louver structure, and the outer diameter of the lift cap and the outer diameter of the lift tube are both 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 both mounted in a detachable manner from the liquid collection chassis.
14. The system of claim 10, wherein the lift cap is a tower-type louver structure, and the outer diameter of the lift cap and the outer diameter of the lift tube are both 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 both mounted in a detachable manner from the liquid collection chassis.
15. The system of claim 11, wherein the lift cap is a tower-type louver structure, and the outer diameter of the lift cap and the outer diameter of the lift tube are both 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 both mounted in a detachable manner from the liquid collection chassis.
16. The system of claim 12, wherein the lift cap is a tower-type louver structure, and the outer diameter of the lift cap and the outer diameter of the lift tube are both 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 both mounted in a detachable manner from the liquid collection chassis.
17. The system of claim 5, wherein a packing layer is disposed between the liquid collecting device and the spray tower water distributing device.
18. The system of claim 6, wherein a packing layer is disposed between the liquid collecting device and the spray tower water distributing device.
19. The system of claim 7, wherein a packing layer is disposed between the liquid collecting device and the spray tower water distributing device.
20. The system of claim 8, wherein a packing layer is disposed between the liquid collecting device and the spray tower water distributing device.
21. The boiler flue gas waste heat recovery and utilization system according to claim 9, wherein a filler layer is arranged between the liquid collecting device and the spray tower water distributing device.
22. The boiler flue gas waste heat recovery and utilization system according to claim 10, wherein a filler layer is arranged between the liquid collecting device and the spray tower water distributing device.
23. The system of claim 12, wherein a packing layer is disposed between the liquid collecting device and the spray tower water distributing device.
24. The system of claim 12, wherein a packing layer is disposed between the liquid collecting device and the spray tower water distributing device.
25. The boiler flue gas waste heat recovery and utilization system according to claim 13, wherein a filler layer is arranged between the liquid collecting device and the spray tower water distributing device.
26. The system of claim 14, wherein a packing layer is disposed between the liquid collecting device and the spray tower water distributing device.
27. The system of claim 15, wherein a packing layer is disposed between the liquid collecting device and the spray tower water distribution device.
28. The system of claim 16, wherein a packing layer is disposed between the liquid collecting device and the spray tower water distribution device.
29. The boiler flue gas waste heat recovery and utilization system according to claim 5, wherein a spray tower spraying device is arranged between the spray tower water receiving device and the spray tower water distribution device, and is directly or indirectly communicated with the spray tower water receiving device through a spray tower circulating pump; optionally, a spray tower heat medium water buffer device is arranged between the spray tower water receiving device and the spray tower circulating pump.
30. The boiler flue gas waste heat recovery and utilization system according to claim 6, wherein a spray tower spraying device is arranged between the spray tower water receiving device and the spray tower water distribution device, and is directly or indirectly communicated with the spray tower water receiving device through a spray tower circulating pump; optionally, a spray tower heat medium water buffer device is arranged between the spray tower water receiving device and the spray tower circulating pump.
31. The boiler flue gas waste heat recovery and utilization system according to claim 7, wherein a spray tower spraying device is arranged between the spray tower water receiving device and the spray tower water distribution device, and is directly or indirectly communicated with the spray tower water receiving device through a spray tower circulating pump; optionally, a spray tower heat medium water buffer device is arranged between the spray tower water receiving device and the spray tower circulating pump.
32. The boiler flue gas waste heat recovery and utilization system according to claim 8, wherein a spray tower spraying device is arranged between the spray tower water receiving device and the spray tower water distribution device, and is directly or indirectly communicated with the spray tower water receiving device through a spray tower circulating pump; optionally, a spray tower heat medium water buffer device is arranged between the spray tower water receiving device and the spray tower circulating pump.
33. The boiler flue gas waste heat recovery and utilization system according to claim 9, wherein a spray tower spraying device is arranged between the spray tower water receiving device and the spray tower water distribution device, and is directly or indirectly communicated with the spray tower water receiving device through a spray tower circulating pump; optionally, a spray tower heat medium water buffer device is arranged between the spray tower water receiving device and the spray tower circulating pump.
34. The boiler flue gas waste heat recovery and utilization system according to claim 10, wherein a spray tower spraying device is arranged between the spray tower water receiving device and the spray tower water distribution device, and is directly or indirectly communicated with the spray tower water receiving device through a spray tower circulating pump; optionally, a spray tower heat medium water buffer device is arranged between the spray tower water receiving device and the spray tower circulating pump.
35. The boiler flue gas waste heat recovery and utilization system according to claim 11, wherein a spray tower spraying device is arranged between the spray tower water receiving device and the spray tower water distribution device, and is directly or indirectly communicated with the spray tower water receiving device through a spray tower circulating pump; optionally, a spray tower heat medium water buffer device is arranged between the spray tower water receiving device and the spray tower circulating pump.
36. The boiler flue gas waste heat recovery and utilization system according to claim 12, wherein a spray tower spraying device is arranged between the spray tower water receiving device and the spray tower water distribution device, and is directly or indirectly communicated with the spray tower water receiving device through a spray tower circulating pump; optionally, a spray tower heat medium water buffer device is arranged between the spray tower water receiving device and the spray tower circulating pump.
37. The boiler flue gas waste heat recovery and utilization system according to any one of claims 1-36, wherein the flue heat exchanger and the first flue heat exchanger are of a flue heat exchanger integrated structure; the flue gas outlet of the flue heat exchanger is directly communicated with the flue gas inlet of the first flue heat exchanger; the first flue heat exchanger heat medium water outlet is a middle tap of a heat medium water channel of the flue heat exchanger integrated structure.
38. The system of any one of claims 1-36, wherein the flue heat exchanger comprises two or more groups of flue heat exchange modules, each flue heat exchange module having a flue heat exchange module working fluid water inlet and a flue heat exchange module working fluid water outlet;
The flue heat exchanger also comprises a working medium water recirculation pump; the working medium water recirculation pump is provided with a working medium water recirculation pump inlet and a working medium water recirculation pump outlet; the flue heat exchange module working medium water outlets of the flue heat exchange modules are directly or indirectly communicated with the flue heat exchanger working medium water outlets; all the flue heat exchange module working medium water inlets are directly or indirectly communicated with the flue heat exchanger working medium water inlets through flue heat exchange module inlet valves; the working medium water outlet of the flue heat exchanger or the working medium water outlet of the flue heat exchange module is directly or indirectly communicated with the inlet of the working medium water recirculation pump; at least one flue heat exchange module working medium water inlet is directly or indirectly communicated with the working medium water recirculation pump outlet through a flue heat exchange module recirculation valve; optionally, a working medium water reheater is connected in series at the inlet or outlet of the working medium water recirculating pump; or,
the flue heat exchanger also comprises a working medium water pump; the working medium water pump is provided with a working medium water pump inlet and a working medium water pump outlet; the working medium water pump outlet is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the flue heat exchange module working medium water outlets of the flue heat exchange modules are directly or indirectly communicated with the flue heat exchanger working medium water outlets; all the flue heat exchange module working medium water inlets are directly or indirectly communicated with the flue heat exchanger working medium water inlets through flue heat exchange module inlet valves; at least one flue heat exchange module working medium water inlet is directly or indirectly communicated with the working medium water pump inlet through a flue heat exchange module recycling valve.
39. The system of claim 37, wherein the flue heat exchanger comprises two or more groups of flue heat exchange modules, each flue heat exchange module having a flue heat exchange module working fluid water inlet and a flue heat exchange module working fluid water outlet;
the flue heat exchanger also comprises a working medium water recirculation pump; the working medium water recirculation pump is provided with a working medium water recirculation pump inlet and a working medium water recirculation pump outlet; the flue heat exchange module working medium water outlets of the flue heat exchange modules are directly or indirectly communicated with the flue heat exchanger working medium water outlets; all the flue heat exchange module working medium water inlets are directly or indirectly communicated with the flue heat exchanger working medium water inlets through flue heat exchange module inlet valves; the working medium water outlet of the flue heat exchanger or the working medium water outlet of the flue heat exchange module is directly or indirectly communicated with the inlet of the working medium water recirculation pump; at least one flue heat exchange module working medium water inlet is directly or indirectly communicated with the working medium water recirculation pump outlet through a flue heat exchange module recirculation valve; optionally, a working medium water reheater is connected in series at the inlet or outlet of the working medium water recirculating pump; or,
The flue heat exchanger also comprises a working medium water pump; the working medium water pump is provided with a working medium water pump inlet and a working medium water pump outlet; the working medium water pump outlet is directly or indirectly communicated with the working medium water inlet of the flue heat exchanger; the flue heat exchange module working medium water outlets of the flue heat exchange modules are directly or indirectly communicated with the flue heat exchanger working medium water outlets; all the flue heat exchange module working medium water inlets are directly or indirectly communicated with the flue heat exchanger working medium water inlets through flue heat exchange module inlet valves; at least one flue heat exchange module working medium water inlet is directly or indirectly communicated with the working medium water pump inlet through a flue heat exchange module recycling valve.
40. The boiler flue gas waste heat recovery system according to any one of claims 1 to 36, wherein the heat consumer is a steam turbine system; the turbine system includes: the system comprises a turbine high-medium pressure cylinder, a turbine low-pressure cylinder, a condenser, a condensate pump, a low-pressure heater, a first pressurizing heater, a deaerator and a high-pressure heater;
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 condensate pump is provided with a condensate pump inlet and a condensate pump 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 first low-pressure heater is provided with a first low-pressure heater working medium water inlet and a first low-pressure heater working medium water outlet; the first low-pressure heater working medium outlet is also used as the heat user working medium water outlet;
the deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet; the deaerator working medium water inlet is also used as the heat user working medium water inlet;
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 condensate pump inlet; the condensate pump outlet is directly or indirectly communicated with the working medium water inlet of the first low-pressure heater; the first low-pressure heater working medium water outlet is directly or indirectly communicated with the low-pressure heater working medium water inlet, and simultaneously, the first low-pressure heater working medium water outlet is directly or indirectly communicated with the flue heat exchanger working medium water inlet as the heat user working medium water outlet; the deaerator working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet, and simultaneously, the deaerator working medium water inlet is used as a heat user working medium water inlet to be directly or indirectly communicated with the flue heat exchanger working medium water outlet; the deaerator working medium water outlet is directly or indirectly communicated with the high-pressure heater working medium water inlet; the high-pressure heater working medium water outlet is directly or indirectly communicated with the boiler working medium water inlet; 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;
The low-pressure heater is one-stage or multi-stage; the first low-pressure heater is one-stage or multi-stage; the high-pressure heater is a one-stage or multi-stage high-pressure heater;
optionally, a working medium water buffer water tank and a working medium water booster pump are arranged between the working medium water outlet of the first low-pressure heater and the working medium water inlet of the flue heat exchanger.
41. The boiler flue gas waste heat recovery system according to claim 37, wherein the heat consumer is a steam turbine system; the turbine system includes: the system comprises a turbine high-medium pressure cylinder, a turbine low-pressure cylinder, a condenser, a condensate pump, a low-pressure heater, a first pressurizing heater, a deaerator and a high-pressure heater;
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 condensate pump is provided with a condensate pump inlet and a condensate pump 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 first low-pressure heater is provided with a first low-pressure heater working medium water inlet and a first low-pressure heater working medium water outlet; the first low-pressure heater working medium outlet is also used as the heat user working medium water outlet;
the deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet; the deaerator working medium water inlet is also used as the heat user working medium water inlet;
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 condensate pump inlet; the condensate pump outlet is directly or indirectly communicated with the working medium water inlet of the first low-pressure heater; the first low-pressure heater working medium water outlet is directly or indirectly communicated with the low-pressure heater working medium water inlet, and simultaneously, the first low-pressure heater working medium water outlet is directly or indirectly communicated with the flue heat exchanger working medium water inlet as the heat user working medium water outlet; the deaerator working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet, and simultaneously, the deaerator working medium water inlet is used as a heat user working medium water inlet to be directly or indirectly communicated with the flue heat exchanger working medium water outlet; the deaerator working medium water outlet is directly or indirectly communicated with the high-pressure heater working medium water inlet; the high-pressure heater working medium water outlet is directly or indirectly communicated with the boiler working medium water inlet; 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;
The low-pressure heater is one-stage or multi-stage; the first low-pressure heater is one-stage or multi-stage; the high-pressure heater is a one-stage or multi-stage high-pressure heater;
optionally, a working medium water buffer water tank and a working medium water booster pump are arranged between the working medium water outlet of the first low-pressure heater and the working medium water inlet of the flue heat exchanger.
42. The boiler flue gas waste heat recovery system according to claim 38, wherein the heat consumer is a steam turbine system; the turbine system includes: the system comprises a turbine high-medium pressure cylinder, a turbine low-pressure cylinder, a condenser, a condensate pump, a low-pressure heater, a first pressurizing heater, a deaerator and a high-pressure heater;
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 condensate pump is provided with a condensate pump inlet and a condensate pump 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 first low-pressure heater is provided with a first low-pressure heater working medium water inlet and a first low-pressure heater working medium water outlet; the first low-pressure heater working medium outlet is also used as the heat user working medium water outlet;
the deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet; the deaerator working medium water inlet is also used as the heat user working medium water inlet;
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 condensate pump inlet; the condensate pump outlet is directly or indirectly communicated with the working medium water inlet of the first low-pressure heater; the first low-pressure heater working medium water outlet is directly or indirectly communicated with the low-pressure heater working medium water inlet, and simultaneously, the first low-pressure heater working medium water outlet is directly or indirectly communicated with the flue heat exchanger working medium water inlet as the heat user working medium water outlet; the deaerator working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet, and simultaneously, the deaerator working medium water inlet is used as a heat user working medium water inlet to be directly or indirectly communicated with the flue heat exchanger working medium water outlet; the deaerator working medium water outlet is directly or indirectly communicated with the high-pressure heater working medium water inlet; the high-pressure heater working medium water outlet is directly or indirectly communicated with the boiler working medium water inlet; 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;
The low-pressure heater is one-stage or multi-stage; the first low-pressure heater is one-stage or multi-stage; the high-pressure heater is a one-stage or multi-stage high-pressure heater;
optionally, a working medium water buffer water tank and a working medium water booster pump are arranged between the working medium water outlet of the first low-pressure heater and the working medium water inlet of the flue heat exchanger.
43. The system of claim 39, wherein the heat consumer is a steam turbine system; the turbine system includes: the system comprises a turbine high-medium pressure cylinder, a turbine low-pressure cylinder, a condenser, a condensate pump, a low-pressure heater, a first pressurizing heater, a deaerator and a high-pressure heater;
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 condensate pump is provided with a condensate pump inlet and a condensate pump 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 first low-pressure heater is provided with a first low-pressure heater working medium water inlet and a first low-pressure heater working medium water outlet; the first low-pressure heater working medium outlet is also used as the heat user working medium water outlet;
the deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet; the deaerator working medium water inlet is also used as the heat user working medium water inlet;
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 condensate pump inlet; the condensate pump outlet is directly or indirectly communicated with the working medium water inlet of the first low-pressure heater; the first low-pressure heater working medium water outlet is directly or indirectly communicated with the low-pressure heater working medium water inlet, and simultaneously, the first low-pressure heater working medium water outlet is directly or indirectly communicated with the flue heat exchanger working medium water inlet as the heat user working medium water outlet; the deaerator working medium water inlet is directly or indirectly communicated with the low-pressure heater working medium water outlet, and simultaneously, the deaerator working medium water inlet is used as a heat user working medium water inlet to be directly or indirectly communicated with the flue heat exchanger working medium water outlet; the deaerator working medium water outlet is directly or indirectly communicated with the high-pressure heater working medium water inlet; the high-pressure heater working medium water outlet is directly or indirectly communicated with the boiler working medium water inlet; 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;
The low-pressure heater is one-stage or multi-stage; the first low-pressure heater is one-stage or multi-stage; the high-pressure heater is a one-stage or multi-stage high-pressure heater;
optionally, a working medium water buffer water tank and a working medium water booster pump are arranged between the working medium water outlet of the first low-pressure heater and the working medium water inlet of the flue heat exchanger.
44. The system of claim 37, wherein the blower supply inlet is further provided with an air control barrier in direct or indirect communication with the atmosphere.
45. The system of claim 38, wherein the blower supply inlet is further provided with an air control barrier in direct or indirect communication with the atmosphere.
46. The system of claim 39, wherein the blower inlet is further provided with an air control barrier in direct or indirect communication with the atmosphere.
47. The system of claim 40, wherein the blower inlet is further provided with an air control barrier in direct or indirect communication with the atmosphere.
48. The system of claim 41, wherein the blower inlet is further provided with an air control barrier in direct or indirect communication with the atmosphere.
49. The system of claim 42, wherein the blower inlet is further provided with an air control barrier in direct or indirect communication with the atmosphere.
50. The system of claim 43, wherein the blower inlet is further provided with an air control barrier in direct or indirect communication with the atmosphere.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111243698 | 2021-10-25 | ||
| CN202122569285 | 2021-10-25 | ||
| CN2021225692859 | 2021-10-25 | ||
| CN2021112436986 | 2021-10-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219199227U true CN219199227U (en) | 2023-06-16 |
Family
ID=86704805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220190728.5U Active CN219199227U (en) | 2021-10-25 | 2022-01-24 | Boiler flue gas waste heat recovery utilizes system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219199227U (en) |
-
2022
- 2022-01-24 CN CN202220190728.5U patent/CN219199227U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107983077A (en) | A kind of system and method for administering desulfurization fume white plume | |
| CN105909330B (en) | A kind of flue gas waste heat recovery and smoke processing system based on Organic Rankine Cycle | |
| CN101140072A (en) | Desulfurize flue gas waste heat recovery system used in fire coal electric generating set | |
| CN109945278A (en) | A kind of energy conserving system being used for central heating using absorption heat pump depth Mist heat recovering | |
| CN109974062A (en) | A kind of fume afterheat depth recovery system using absorption heat pump and two-stage heat exchanger | |
| CN109945277A (en) | A kind of energy conserving system being used for central heating using electric heat pump depth recycling remaining heat of flue gas from steam power plant | |
| CN110182874A (en) | A kind of super low energy consumption flash concentration desulfurization wastewater and industrial brine waste zero emission system | |
| CN104089430A (en) | Sprinkling open type absorption heat pump system capable of recycling waste heat of airflow containing moisture | |
| CN201103915Y (en) | Desulfurized flue gas waste heat recovery system for fire coal generator set | |
| CN208742284U (en) | A kind of single column washing Wet fume sweetening dust remover of no stock tank secondary cycle | |
| CN219199227U (en) | Boiler flue gas waste heat recovery utilizes system | |
| CN210057887U (en) | Flue gas deep purification system for eliminating waste heat utilization type smoke plume | |
| CN208365564U (en) | A kind of boiler smoke energy conservation disappears white device | |
| CN219045754U (en) | Boiler flue gas waste heat recovery utilizes system | |
| CN208260465U (en) | A kind of system for administering desulfurization fume white plume | |
| CN220186862U (en) | Boiler flue gas waste heat recovery utilizes system | |
| CN221076519U (en) | Flue gas waste heat recycling system | |
| CN220205787U (en) | High-efficient recycle system of flue gas waste heat | |
| CN220186863U (en) | Boiler flue gas waste heat recovery utilizes system | |
| CN219934018U (en) | Boiler flue gas waste heat recycling system | |
| CN219103786U (en) | Rotating cage heat exchanger system | |
| CN220187131U (en) | Efficient absorption heat pump system | |
| CN221005109U (en) | Boiler flue gas waste heat recovery utilizes system | |
| CN219934016U (en) | Boiler flue gas waste heat recycling system | |
| CN219934019U (en) | Boiler flue gas waste heat recovery utilizes system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |