CN111442291A - System for recovering waste heat and water of discharged smoke in gradient manner and operation method - Google Patents
System for recovering waste heat and water of discharged smoke in gradient manner and operation method Download PDFInfo
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- CN111442291A CN111442291A CN202010336827.5A CN202010336827A CN111442291A CN 111442291 A CN111442291 A CN 111442291A CN 202010336827 A CN202010336827 A CN 202010336827A CN 111442291 A CN111442291 A CN 111442291A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a system for recovering waste heat and water of exhaust smoke in a stepped manner and an operation method thereof, wherein the system comprises a boiler, a steam turbine and a steam turbine cooling heat recovery device which are sequentially connected, wherein the steam turbine extracts steam from the boiler and enters the steam turbine cooling heat recovery device through a pipeline to heat condensed water and supply water to the boiler; the steam extraction port of the steam turbine is connected with the inlet of a generator, and the water outlet of the generator is connected with the steam turbine cooling and heat regenerating device; the steam outlet of the generator is connected with a condenser; the generator is sequentially connected with at least one stage of absorber, a pressure exchanger, a booster pump and a reverse osmosis device, the reverse osmosis device is connected back to the generator, and strong brine solution is contained in the generator and the absorber and can be recycled along the system; the boiler flue gas port is connected with the dust remover and the desulfurizing tower in sequence, and the flue gas outlet of the desulfurizing tower is connected with the absorber. The method realizes the recovery of the waste heat and the moisture of the boiler exhaust smoke by utilizing the absorption effect of the high-concentration solution, and has obvious energy-saving and water-saving effects.
Description
Technical Field
The invention relates to the technical field of environmental protection equipment, in particular to a system for recovering waste heat and water of exhaust smoke in a gradient manner and an operation method thereof.
Background
Reducing fuel consumption of coal-fired power stations, pollutant discharge and water consumption of power stations are key technical problems of thermal power plants. With the development of the technology, the low-pressure economizer is widely used for recovering waste heat of boiler exhaust smoke, and the recovery of the waste heat of the boiler exhaust smoke of the power station can improve the efficiency of a coal-fired power station. The boiler exhaust smoke is treated, the pollutant emission level of a coal-fired power plant can be reduced, a dust remover is uniformly arranged at the tail of a modern coal-fired power plant boiler to remove solid pollutants in the smoke, and a desulfurizing tower is arranged to remove sulfur dioxide in the boiler. The modern desulfurization process is mainly a wet desulfurization process, which causes high moisture content gas behind a desulfurization tower of a coal-fired boiler, and the direct discharge of the high moisture content gas causes a great deal of water resource waste, which is caused by taking away a great amount of liquid water through the discharge of water vapor in flue gas. Flue gas water recovery is a necessary option to address this problem.
The existing flue gas dehydration process mainly adopts a dividing wall type cooling mode, and has the disadvantages of complex system, large occupied area and poor operation safety and stability.
Disclosure of Invention
The first purpose of the invention is to provide a system for recovering waste heat and water of exhaust smoke in a cascade manner, which can effectively recover and utilize the waste heat and water in the exhaust smoke after boiler steam and wet desulphurization, thereby avoiding resource waste;
a second objective of the present invention is to provide an operation method of a system for recovering waste heat and water of exhaust smoke in a cascade manner, which aims to solve the problems in the background art.
The invention provides a system for recovering waste heat and water of exhaust smoke in a stepped manner, which comprises a boiler, a steam turbine and a steam turbine cooling and heat-regenerating device, wherein the boiler, the steam turbine and the steam turbine cooling and heat-regenerating device are sequentially connected to form a closed loop; the steam extraction port of the steam turbine is connected with the inlet of a generator, and the water outlet of the generator is connected with the steam turbine cooling and heat regenerating device; the steam outlet of the generator is connected with a condenser; the generator is sequentially connected with at least one absorber, a pressure exchanger, a booster pump and a reverse osmosis device, a liquid outlet of the reverse osmosis device is communicated with the pressure exchanger, an outlet of the pressure exchanger is connected back to the generator, the generator and the absorber are filled with strong brine, the strong brine can flow along the absorber, the pressure exchanger, the booster pump and the reverse osmosis device, and after dilution, pressurization and permeation, desalted water is recovered, and a salt solution flows back to the generator after being pressurized by the pressure exchanger for recycling; the boiler flue gas outlet is connected with the dust remover and the desulfurizing tower in sequence through a flue, and the flue gas outlet of the desulfurizing tower is connected with the absorber.
Preferably, the absorber has two stages and comprises a first absorber and a second absorber which are connected with each other, a water inlet of the first absorber is communicated with the generator, the first absorber is communicated with the flue gas outlet of the desulfurization tower, and the second absorber is communicated with the pressure exchanger.
Preferably, a low-temperature economizer is indirectly arranged between the boiler flue gas outlet and the dust remover, the low-temperature economizer is communicated with the turbine cooling heat recovery device, and heat energy absorbed from the boiler flue gas can be transferred to the turbine cooling heat recovery device to be used for heating condensed water.
Preferably, the boiler further comprises a fan heater, an outlet of the fan heater is communicated with an air inlet of the boiler, and an inlet of the fan heater is placed in the air.
Preferably, the air heater is communicated with the absorbers, the concentrated salt solution for cooling can circulate between the air heater and the absorbers, and the air entering the air heater is heated to 40-55 ℃ by absorbing the waste heat of the flue gas in the process.
Preferably, the concentrated salt solution is a calcium chloride solution.
Preferably, the generator is a dividing wall type heat exchanger.
The invention also provides an operation method of the system for recovering the waste heat and the water of the discharged smoke in a gradient manner, which comprises the following steps:
firstly, dedusting boiler flue gas by a deduster, desulfurizing the flue gas in a desulfurizing tower, and absorbing moisture and heat in the flue gas by using a strong salt solution in an absorber;
step two, after the diluted saline solution after absorbing water is pressurized by a pressure exchanger and a booster pump, desalted water is recovered under the action of a reverse osmosis device, and the saline solution enters the generator through the pressure exchanger;
step three, a steam turbine extracts steam from the boiler and introduces the steam into the generator to heat and evaporate the salt solution, the evaporated steam enters the condenser to be condensed, and the condensed water is recovered;
introducing part of the condensed water in the condenser and the salt solution in the generator into the turbine cooling and heat regenerating device, and introducing the part of the condensed water and the salt solution into the boiler after the part of the condensed water and the salt solution are heated by the steam extraction of the turbine so as to provide water for the boiler;
and step five, adjusting the concentration of the salt solution in the generator, wherein the salt solution flows into the absorber, thereby controlling the temperature and the moisture content of the flue gas outlet of the absorber.
The invention has the following beneficial effects:
(1) the absorption effect of the high-concentration solution is utilized to realize the simultaneous recovery of the waste heat and the moisture of the boiler exhaust smoke, the energy-saving and water-saving effects are obvious, and the cost investment is reduced;
(2) the waste heat and water of the boiler exhaust smoke are recovered by adopting a direct contact method, no heat exchange surface exists, and the system is more stable and reliable;
(3) the latent heat of vaporization in the water recovery process is utilized in a gradient manner, the system flexibility is good, and the energy-saving effect is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a system for cascade utilization of waste heat of exhaust smoke and water provided by the invention.
Description of reference numerals:
1: a boiler;
2: a steam turbine;
3: a turbine cooling heat recovery device;
4: a low-temperature economizer;
5: a dust remover;
6: a desulfurizing tower;
7: a generator;
8: a condenser;
9: a first absorber;
10: a second absorber;
11: a pressure exchanger;
12: a booster pump;
13: a reverse osmosis unit;
14: a warm air device.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the system for recovering waste heat and water of exhaust smoke in a stepped manner provided by the invention comprises a boiler 1, a steam turbine 2 and a steam turbine cooling and heat-returning device 3 which are sequentially connected to form a closed loop, wherein a steam inlet of the steam turbine 2 is communicated with the inside of the boiler 1, the steam turbine 2 extracts steam from the boiler 1, and the extracted steam can enter the steam turbine cooling and heat-returning device 3 through a pipeline to heat condensed water and supply water to the boiler 1. The smoke outlet of the boiler 1 is connected with a low-temperature economizer 4, the low-temperature economizer 4 is connected with a dust remover 5, the dust remover 5 is connected with a desulfurizing tower 6, the low-temperature economizer 4 is connected with a turbine cooling heat regenerative device 3, the temperature of smoke is reduced after passing through the low-temperature economizer 4, the low-temperature economizer 4 can transfer the absorbed smoke heat to the turbine cooling heat regenerative device 3 for heating the condensation water inside the turbine cooling heat regenerative device, and the smoke with the temperature reduced by the low-temperature economizer 4 enters the desulfurizing tower 6 after being dedusted by the dust remover 5 for removing sulfur dioxide in the smoke.
The steam extraction port of the steam turbine 2 is connected with the inlet of a generator 7, and the water outlet of the generator 7 is connected with the steam turbine cooling and heat returning device 3; the steam outlet of the generator 7 is connected with a condenser 8; the generator 7 is sequentially connected with a first absorber 9, a second absorber 10, a pressure exchanger 11, a booster pump 12 and a reverse osmosis device 13, the pressure exchanger 11 is connected with an inlet of the reverse osmosis device 13 through the booster pump 12, an outlet of the reverse osmosis device 13 is connected back to the pressure exchanger 11, and an outlet of the pressure exchanger 11 is connected back to the generator 7, so that a complete closed loop is formed. The generator 7, the first absorber 9 and the second absorber 10 are all filled with high-concentration calcium chloride solution, and the generator 7, the first absorber 9, the second absorber 10, the pressure exchanger 11, the booster pump 12 and the reverse osmosis device 13 are communicated in sequence, so that the calcium chloride solution can circulate along the closed-loop path.
The flue gas outlet of desulfurizing tower 6 is linked together with first absorber 9, because what present desulfurizing tower 6 generally adopted all is wet flue gas desulfurization, utilizes limestone and water to mix promptly, sprays the power plant flue gas after the dust removal, gets rid of the sulfur dioxide harmful gas that contains wherein, consequently can contain a large amount of moisture in the flue gas through the desulfurization, directly discharges and can cause the wasting of resources, and the moisture in the desorption flue gas is absorbed in the effect of high concentration calcium chloride solution.
Since the partial pressure of the volatile component in the gas phase is higher than the vapor pressure of this component in the solution, more water molecules enter the solution in the flue gas, with a simultaneous exotherm. In the first absorber 9 and the second absorber 10, the boiler 1 exhaust gas is directly contacted with calcium chloride solution, moisture in the exhaust gas is absorbed by the solution, heat is released at the same time, and the released heat is taken out through the solution to preheat air or heat condensed water. The calcium chloride solution absorbing the moisture in the flue gas can dilute and reduce the concentration, so the calcium chloride solution is pressurized by the pressure exchanger 11 and the booster pump 12, then enters the reverse osmosis device 13, the desalted fresh water is recovered under the action of the reverse osmosis device 13, and the calcium chloride solution with the moisture removed and the increased concentration flows back to the generator 7 after being pressurized by the pressure exchanger 11; the calcium chloride solution flowing back into the generator 7 is evaporated and condensed in the condenser 8 under the heating action of the extracted steam, the formed fresh water is recycled for the second time, and the recycled water can be used for supplementing water for the boiler 1.
Specifically, the boiler further comprises a fan heater 14, an air inlet of the boiler 1 is communicated with an air outlet of the fan heater 14, an air inlet of the fan heater 14 is arranged in air, and air sucked by the fan heater 14 can be heated and then introduced into the boiler 1. The air heater 14 is respectively communicated with the first absorber 9 and the second absorber 10, a cooling working medium calcium chloride solution is arranged in the air heater 14, the cooling working medium can be divided by the air heater 14 to enter the first absorber 9 and the second absorber 10 and then is collected to enter the air heater 14 for internal circulation, the flue gas waste heat collected in the process enters the air heater 14 to heat the air entering the air heater, and the temperature of the air is heated to 40-55 ℃ and then the air is introduced into the boiler 1 for use.
Specifically, the generator 7 is a dividing wall type heat exchanger, which is a novel efficient heat exchanger formed by stacking a series of metal sheets with certain corrugated shapes, thin rectangular channels are formed among various sheets, heat exchange is carried out through the sheets, and the heat transfer efficiency is high. The generator 7 heats the calcium chloride solution by using the steam extracted from the steam turbine 2, the calcium chloride solution enters the condenser 8 for condensation after being evaporated, a part of the heated calcium chloride solution flows into the steam turbine cooling heat recovery device 3 to heat the condensed water, and a part of the heated calcium chloride solution enters the first absorber 9 and the second absorber 10 for circulation.
The operation method of the system for recovering the waste heat and the water in the smoke in a gradient manner comprises the following steps:
firstly, flue gas in a boiler 1 absorbs certain flue gas heat through a low-temperature economizer 4, the temperature of the flue gas at the outlet of the low-temperature economizer 4 is controlled to be 95-100 ℃, the flue gas is dedusted by a deduster 5, the flue gas enters a desulfurizing tower 6 for desulfurization, the flue gas sequentially enters a first absorber 9 and a second absorber 10, moisture and heat contained in the flue gas after wet desulfurization are absorbed by high-concentration calcium chloride salt solution in the first absorber 9 and the second absorber 10, and the temperature of the flue gas at the outlet of the second absorber 10 is controlled to be 60-70 ℃;
step two, after the calcium chloride solution diluted after absorbing the moisture in the flue gas is pressurized by a pressure exchanger 11 and a booster pump 12, the desalted fresh water is separated and recovered, and the calcium chloride solution with the moisture removed and the increased concentration flows back to the generator 7 after being pressurized by the pressure exchanger 11;
step three, the steam turbine 2 extracts steam from the boiler 1 and feeds the steam into the generator 7, the high-temperature steam releases heat in the generator 7 to heat and evaporate the calcium chloride solution, and the evaporated steam enters the condenser 8 from an outlet to be condensed into water for recycling and is used for replenishing water to the boiler 1;
step four, introducing part of the condensed water in the condenser 8 and the calcium chloride solution heated in the generator 7 into the turbine cooling heat recovery device 3, heating the condensed water by the steam extraction of the turbine and the heat absorbed by the low-temperature economizer 4 from the flue gas together, and introducing the heated condensed water into the boiler 1 to supply water for the boiler 1;
and step five, adjusting the concentration of the calcium chloride solution in the generator 7, enabling the calcium chloride solution to flow into the first absorber 9 and the second absorber 10, and controlling the capacity of absorbing moisture and heat by controlling the concentration of the solution so as to control the temperature and moisture content of the flue gas at the outlet of the second absorber 10 and adjust the temperature of the flue gas at 60-70 ℃.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A system for recovering waste heat and water of exhaust smoke in a gradient manner is characterized by comprising a boiler, a steam turbine and a steam turbine cooling and heat-regenerating device which are sequentially connected to form a closed loop, wherein the steam turbine extracts steam from the boiler and enters the steam turbine cooling and heat-regenerating device through a pipeline to heat condensed water and supply water to the boiler; the steam extraction port of the steam turbine is connected with the inlet of a generator, and the water outlet of the generator is connected with the steam turbine cooling and heat regenerating device; the steam outlet of the generator is connected with a condenser; the generator is sequentially connected with at least one absorber, a pressure exchanger, a booster pump and a reverse osmosis device, a liquid outlet of the reverse osmosis device is communicated with the pressure exchanger, an outlet of the pressure exchanger is connected back to the generator, the generator and the absorber are filled with strong brine, the strong brine can flow along the absorber, the pressure exchanger, the booster pump and the reverse osmosis device, and after dilution, pressurization and permeation, desalted water is recovered, and a salt solution flows back to the generator after being pressurized by the pressure exchanger for recycling; the boiler flue gas outlet is connected with the dust remover and the desulfurizing tower in sequence through a flue, and the flue gas outlet of the desulfurizing tower is connected with the absorber.
2. The system for cascade recovery of exhaust gas waste heat and water as claimed in claim 1, wherein the absorber has two stages, and comprises a first absorber and a second absorber connected with each other, the first absorber water inlet is communicated with the generator, the first absorber is communicated with the flue gas outlet of the desulfurization tower, and the second absorber is communicated with the pressure exchanger.
3. The system for recycling waste heat and water of exhaust smoke in a cascading manner as claimed in claim 1, wherein a low-temperature economizer is connected between the boiler smoke outlet and the dust remover, and the low-temperature economizer is communicated with the turbine cooling heat regenerator to transfer heat energy absorbed from the boiler smoke to the turbine cooling heat regenerator for heating condensed water.
4. The system for step recovery of exhaust smoke waste heat and water according to claim 1, further comprising a fan heater, wherein an outlet of the fan heater is connected to an air inlet of the boiler, and an inlet of the fan heater is placed in air.
5. The system for recycling waste heat and water of exhaust smoke in a stepped mode according to claim 4, wherein the air heater is communicated with each absorber, the concentrated salt solution for cooling can be circulated between the air heater and each absorber, and the air entering the air heater is heated to 40-55 ℃ by absorbing waste heat of the exhaust smoke in the process.
6. The system for recovering waste heat and water of discharged smoke in a stepped mode according to claim 1, wherein the concentrated salt solution is a calcium chloride solution.
7. The system for step recovery of exhaust smoke waste heat and water according to claim 1, wherein the generator is a dividing wall type heat exchanger.
8. The operation method of the system for recovering the waste heat and water of the exhaust smoke in a cascade mode according to any one of claims 1 to 7 is characterized by comprising the following steps of:
firstly, dedusting boiler flue gas by a deduster, desulfurizing the flue gas in a desulfurizing tower, and absorbing moisture and heat in the flue gas by using a strong salt solution in an absorber;
step two, after the diluted saline solution after absorbing water is pressurized by a pressure exchanger and a booster pump, desalted water is recovered under the action of a reverse osmosis device, and the saline solution enters the generator through the pressure exchanger;
step three, a steam turbine extracts steam from the boiler and introduces the steam into the generator to heat and evaporate the salt solution, the evaporated steam enters the condenser to be condensed, and the condensed water is recovered;
introducing part of the condensed water in the condenser and the salt solution in the generator into the turbine cooling and heat regenerating device, and introducing the part of the condensed water and the salt solution into the boiler after the part of the condensed water and the salt solution are heated by the steam extraction of the turbine so as to provide water for the boiler;
and step five, adjusting the concentration of the salt solution in the generator, wherein the salt solution flows into the absorber, thereby controlling the temperature and the moisture content of the flue gas outlet of the absorber.
9. The method of claim 8, wherein the salt solution is calcium chloride solution in each step.
10. The method for operating a system for cascade recovery of exhaust gas waste heat and water as claimed in claim 8, wherein the temperature of the absorber flue gas outlet is controlled to 60-70 ℃ in step five.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336827.5A CN111442291A (en) | 2020-04-26 | 2020-04-26 | System for recovering waste heat and water of discharged smoke in gradient manner and operation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336827.5A CN111442291A (en) | 2020-04-26 | 2020-04-26 | System for recovering waste heat and water of discharged smoke in gradient manner and operation method |
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| CN202010336827.5A Pending CN111442291A (en) | 2020-04-26 | 2020-04-26 | System for recovering waste heat and water of discharged smoke in gradient manner and operation method |
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