CN117053172A - Comprehensive utilization and cooperative peak shaving system for tail end wastewater of power plant and application method - Google Patents
Comprehensive utilization and cooperative peak shaving system for tail end wastewater of power plant and application method Download PDFInfo
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- CN117053172A CN117053172A CN202311198731.7A CN202311198731A CN117053172A CN 117053172 A CN117053172 A CN 117053172A CN 202311198731 A CN202311198731 A CN 202311198731A CN 117053172 A CN117053172 A CN 117053172A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 162
- 238000000034 method Methods 0.000 title claims abstract description 17
- 150000003839 salts Chemical class 0.000 claims abstract description 181
- 238000005338 heat storage Methods 0.000 claims abstract description 48
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 45
- 238000010248 power generation Methods 0.000 claims abstract description 29
- 238000004064 recycling Methods 0.000 claims abstract description 5
- 238000003860 storage Methods 0.000 claims description 98
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 238000001035 drying Methods 0.000 claims description 37
- 238000009826 distribution Methods 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000007812 deficiency Effects 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000010795 Steam Flooding Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 17
- 230000007613 environmental effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001804 chlorine Chemical class 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Combustion & Propulsion (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a comprehensive utilization and cooperative peak shaving system for tail end wastewater of a power plant and a use method thereof, wherein the system comprises the following components: a coal-fired unit power generation system; the molten salt heat storage system is communicated with the coal-fired unit power generation system; and the tail end wastewater treatment system realizes wastewater treatment and recycling of wastewater products by utilizing heat released by the fused salt heat storage system. According to the invention, the thermoelectric separation of the coal-fired unit power generation system is realized by adding the fused salt heat storage system, the heat of the coal-fired unit power generation system can be stored and released to realize wastewater treatment, the coal-fired unit can realize rapid load change and very low deep peak regulation under the condition of very small reconstruction engineering quantity, the adaptability to the load demand of a power grid is improved, a stable heat source can be provided for wastewater treatment, the stable and reliable wastewater treatment is ensured, the problem of unstable heat source of wastewater treatment is effectively solved, the product of wastewater treatment is recycled for the fused salt heat storage system, the zero emission and comprehensive utilization of the whole process are realized, and the method has important significance and value for the construction and reconstruction of zero wastewater emission.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a comprehensive utilization and cooperative peak shaving system for tail wastewater of a power plant and a use method thereof.
Background
The national pollution control of water environment is very important, the environmental protection policy puts forward strict limits on the discharge standard and total discharge amount of various waste water, and enterprises are encouraged to adopt various water-saving new technologies to deeply treat and recycle various waste water. The tail end waste water of the power plant contains desulfurization waste water, chemical treatment waste water and the like, and is characterized by high salt and high chlorine, and the tail end waste water can not be directly discharged according to the current environmental protection policy requirements and pollution discharge license requirements in various places, and can be discharged only after corresponding treatment is carried out, and the environmental discharge requirements are met. At present, the treatment idea of the wastewater at the tail end of the power plant is zero emission, the wastewater is evaporated by utilizing external heat sources such as steam or smoke, and various sulfate, chloride and the like are remained after solidification. However, because the steam or the flue gas required by the wastewater treatment can be extracted when the unit load is high, the load fluctuation is frequent and the deep peak regulation time is long after the current thermal power unit participates in the flexible peak regulation, thereby causing unstable heat source of the wastewater treatment and difficult wastewater treatment. Therefore, in the background of flexibility peak shaving, the wastewater treatment at the tail end of the power plant cannot be stably ensured.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provide a comprehensive utilization and cooperative peak shaving system for tail end wastewater of a power plant and a use method thereof.
In order to achieve the above purpose and achieve the above technical effects, the invention adopts the following technical scheme:
a power plant terminal wastewater comprehensive utilization cooperative peak shaving system comprises:
the coal-fired unit power generation system is used for generating steam and realizing power generation;
the molten salt heat storage system is communicated with the coal-fired unit power generation system and is used for storing heat of the coal-fired unit power generation system and releasing the stored heat;
and the tail end wastewater treatment system is communicated with the molten salt heat storage system and is used for realizing wastewater treatment and wastewater product recycling by utilizing heat released by the molten salt heat storage system.
Furthermore, the coal-fired unit power generation system comprises a boiler, a steam turbine, a generator and a power grid, wherein the boiler burns to generate steam, and the steam drives the steam turbine to rotate so as to drive the generator to generate power and transmit the power to the power grid.
Further, the coal-fired unit power generation system further comprises a steam distribution device A, wherein the steam distribution device A is communicated with a boiler, a steam turbine and a first heat exchange tube arranged in the heat exchanger A, and the first heat exchange tube is also communicated with the boiler.
Further, the fused salt heat storage system comprises a heat exchanger A, a cold salt storage tank, a hot salt storage tank and a heat exchanger B, wherein a boiler, the cold salt storage tank and the hot salt storage tank of the coal-fired unit power generation system are respectively communicated with the heat exchanger A, steam from the boiler exchanges heat with cold salt from the cold salt storage tank in the heat exchanger A, the steam exchanges heat and then is condensed and returns to the boiler to circulate, the cold salt exchanges heat and then becomes hot salt and is conveyed to the hot salt storage tank, the hot salt storage tank and the demineralized water storage tank are respectively communicated with the heat exchanger B, the hot salt from the hot salt storage tank exchanges heat with the demineralized water from the demineralized water storage tank in the heat exchanger B, the hot salt exchanges heat and becomes cold salt, returns to the cold salt storage tank to circulate, and becomes high-temperature steam after the demineralized water exchanges heat, and can be distributed to a steam turbine and a tail end wastewater treatment system according to wastewater treatment requirements and quick load increasing requirements of the unit.
Further, the molten salt heat storage system further comprises a molten salt conveying pump A and a molten salt conveying pump B, the cold salt storage tank is communicated with a second heat exchange pipe arranged in the heat exchanger A through the molten salt conveying pump A, cold salt in the cold salt storage tank is conveyed into the second heat exchange pipe through the molten salt conveying pump A and exchanges heat with steam in a first heat exchange pipe arranged in the heat exchanger A, the second heat exchange pipe is communicated with a hot salt storage tank, the hot salt storage tank is communicated with a third heat exchange pipe arranged in the heat exchanger B through the molten salt conveying pump B and is communicated with the cold salt storage tank, and hot salt in the hot salt storage tank is conveyed into the third heat exchange pipe through the molten salt conveying pump B and is used for heating desalted water from the desalted water storage tank and enabling the desalted water to be changed into high-temperature steam.
Further, terminal effluent disposal system includes waste water drying tower, waste water concentration tower, waste water holding vessel, demineralized water storage tank and waste water and produce the salt storage tank, waste water concentration tower is linked together with waste water drying tower and waste water holding vessel respectively, waste water produces salt storage tank and cold salt storage tank, hot salt storage tank and waste water drying tower and is linked together, waste water that collects in the waste water holding vessel is carried to waste water concentration tower and is concentrated and carry to waste water drying tower again, high temperature steam gets into waste water drying tower and carries out the drying to waste water after concentrating, and high temperature steam becomes low temperature steam and reentrant waste water concentration tower and carries out concentrating to waste water after heat transfer, and low temperature steam condenses back to in the demineralized water storage tank and circulates, and waste water is carried to waste water after drying and produces salt storage tank circulation.
Further, terminal effluent disposal system still includes steam distribution device B, waste water product salt delivery pump, concentrated waste water delivery pump, demineralized water delivery pump and fused salt make-up pump, waste water drying tower bottom is linked together with waste water product salt storage tank through waste water product salt delivery pump, waste water concentrating tower bottom is linked together with waste water drying tower top through concentrated waste water delivery pump, waste water holding vessel is linked together with waste water concentrating tower top through waste water delivery pump, demineralized water storage tank is linked together with the built-in fourth heat transfer pipe of heat exchanger B through demineralized water delivery pump and is linked together to steam distribution device B again, demineralized water in the demineralized water storage tank is heated into high temperature steam after being carried in the fourth heat transfer pipe and heat salt heat transfer through demineralized water delivery pump, steam distribution device B distributes high temperature steam for steam turbine and waste water drying tower according to waste water treatment demand and unit rapid increase load demand, distributes the high temperature steam of steam turbine when the steam turbine needs rapid increase steam volume, waste water product salt storage tank is linked together with cold salt storage tank and heat salt storage tank through the fused salt make-up pump.
Further, terminal effluent disposal system still includes compressed air storage tank, compressed air storage tank and waste water drying tower and waste water concentration tower intercommunication, compressed air storage tank lets in compressed air to waste water drying tower and waste water concentration tower in, takes away the steam of evaporation, blows in the furnace of boiler, avoids the environment of dyeing of outer blowdown, and compressed air is malleation, and furnace is negative pressure.
Further, a fifth heat exchange tube is arranged in the waste water drying tower, a sixth heat exchange tube is arranged in the waste water concentrating tower, the bottom end of the fifth heat exchange tube is communicated with the steam distribution device B, the top end of the fifth heat exchange tube is communicated with the bottom end of the sixth heat exchange tube, and the top end of the sixth heat exchange tube is communicated with the desalted water storage tank.
The invention discloses a use method of a power plant tail end wastewater comprehensive utilization cooperative peak shaving system, which comprises the following steps:
when the load of the coal-fired unit needs to be quickly reduced, the steam quantity generated by the boiler is more than that required by the steam turbine, redundant steam is distributed to the heat exchanger A through the steam distribution device A for heating cold salt, and the fused salt heat storage system plays a role of absorbing redundant heat;
when the load of the coal-fired unit needs to be rapidly increased, the steam quantity generated by the boiler is smaller than the steam quantity required by the steam turbine, high-temperature steam generated by heating hot salt is distributed to the steam turbine through the steam distribution device B so as to make up for the deficiency of the steam, and at the moment, the fused salt heat storage system bears the function of releasing heat;
when the coal-fired unit deeply peak-shaving, the operation load is lower than the lowest load, and the lowest steam quantity generated by the boiler is still more than the steam quantity required by the steam turbine, redundant steam is distributed to the heat exchanger A through the steam distribution device A for heating cold salt, and the fused salt heat storage system plays a role of absorbing redundant heat;
when the load of the coal-fired unit fluctuates rapidly or deeply, the fused salt heat storage system is used for storing heat in the flexible peak regulation process of the coal-fired unit, a stable heat source is provided for wastewater treatment after the stored heat is released, the wastewater is concentrated and dried, the dependence of the wastewater treatment on the running condition of the coal-fired unit is reduced, and the product generated by the wastewater is recycled to the fused salt heat storage system and used for supplementing the loss of the fused salt heat storage system, so that zero emission is finally achieved.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a comprehensive utilization and cooperative peak shaving system for tail end wastewater of a power plant and a use method thereof, wherein the system comprises the following components: the coal-fired unit power generation system is used for generating steam and realizing power generation; the molten salt heat storage system is communicated with the coal-fired unit power generation system and is used for storing heat of the coal-fired unit power generation system and releasing the stored heat; and the tail end wastewater treatment system is communicated with the molten salt heat storage system and is used for realizing wastewater treatment and wastewater product recycling by utilizing heat released by the molten salt heat storage system. According to the comprehensive utilization and cooperative peak regulation system for the tail end waste water of the power plant and the use method thereof, provided by the invention, the thermoelectric separation of the power generation system of the coal-fired unit is realized by adding the fused salt heat storage system, the heat of the power generation system of the coal-fired unit can be stored, the stored heat is released to realize the waste water treatment, the load of the unit can be rapidly changed under the condition of small reconstruction engineering quantity, the very low deep peak regulation can be realized, the adaptability of the coal-fired unit to the load of a power grid is greatly improved, the boiler is not required to be greatly changed, the shortening of the metal life of the boiler body is effectively avoided, meanwhile, the stable and reliable heat source can be provided for the waste water treatment by adding the fused salt heat storage system, the problem of unstable heat source of the waste water treatment in the prior art is effectively solved, the waste water treatment product is various salts and can be reused for the fused salt heat storage system, and the zero emission and comprehensive utilization of the whole flow are realized; the invention not only realizes the peak regulation requirement of the coal-fired unit, but also solves the problem of unstable heat source of wastewater treatment, and simultaneously comprehensively recycles the wastewater treatment product for the molten salt heat storage system to realize zero emission, thereby having the characteristics of energy conservation, low carbon, environmental protection and the like, and having important significance and value for the construction and reconstruction of wastewater zero emission.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
wherein: 1. a boiler; 2. a steam distribution device A; 3. a steam turbine; 4. a generator; 5. a power grid; 6. a heat exchanger A; 7. a molten salt delivery pump A; 8. a cold salt storage tank; 9. a hot salt storage tank; 10. a molten salt delivery pump B; 11. a heat exchanger B; 12. a steam distribution device B; 13. a waste water drying tower; 14. a wastewater concentration tower; 15. a waste water salt conveying pump; 16. a concentrated wastewater delivery pump; 17. a waste water storage tank; 18. a waste water transfer pump; 19. a compressed air storage tank; 20. a demineralized water delivery pump; 21. a demineralized water storage tank; 22. a waste water salt storage tank; 23. molten salt replenishing pump.
Detailed Description
The present invention is described in detail below so that advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and unambiguous the scope of the present invention.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
As shown in fig. 1, a system for peak shaving in cooperation with comprehensive utilization of wastewater at the tail end of a power plant includes:
the coal-fired unit power generation system is used for generating steam and realizing power generation;
the molten salt heat storage system is communicated with the coal-fired unit power generation system and is used for storing heat of the coal-fired unit power generation system and releasing the stored heat;
and the tail end wastewater treatment system is communicated with the molten salt heat storage system and is used for realizing wastewater treatment and wastewater product recycling by utilizing heat released by the molten salt heat storage system.
The coal-fired unit power generation system includes: the boiler 1 is communicated with the steam turbine 3 through the steam distribution device A2 and then is sequentially communicated with the generator 4 and the power grid 5, steam generated by combustion of the boiler 1 is distributed to the steam turbine 3 through the steam distribution device A2, the steam turbine 3 is pushed to rotate, and the generator 4 is driven to generate power and is conveyed to the power grid 5.
The molten salt heat storage system includes: the heat exchange system comprises a heat exchanger A6, a molten salt conveying pump A7, a cold salt storage tank 8, a hot salt storage tank 9, a molten salt conveying pump B10 and a heat exchanger B11, wherein cold salt in the cold salt storage tank 8 is conveyed into a second heat exchange tube of the heat exchanger A6 through the molten salt conveying pump A7 to be heated, heat sources of the first heat exchange tube in the heat exchanger A6 come from partial steam distributed by a steam distribution device A2, the steam is condensed and returned to the boiler 1 for circulation after heating the cold salt, the cold salt is conveyed to the hot salt storage tank 9 after being heated into hot salt through the steam in the heat exchanger A6, the hot salt in the hot salt storage tank 9 is conveyed into a third heat exchange tube of the heat exchanger B11 through the molten salt conveying pump B10 to be used for heating the desalted water from the desalted water storage tank 21 and changing the hot salt into high-temperature steam, and the hot salt is heated into cold salt after being desalted, and then returns to the cold salt storage tank 8, and thus one heat exchange cycle is completed. The molten salt heat storage system has two functions, one is to store the redundant heat of the boiler 1 due to the flexibility peak shaving, and the other is to release the stored heat for wastewater treatment or rapid load increase.
The terminal wastewater treatment system comprises: the system comprises a steam distribution device B12, a waste water drying tower 13, a waste water concentration tower 14, a waste water salt production delivery pump 15, a concentrated waste water delivery pump 16, a waste water storage tank 17, a waste water delivery pump 18, a compressed air storage tank 19, a desalted water delivery pump 20, a desalted water storage tank 21, a waste water salt production storage tank 22 and a fused salt replenishing pump 23. The demineralized water in the demineralized water storage tank 21 is conveyed to the fourth heat exchange tube of the heat exchanger B11 through the demineralized water conveying pump 20, and is heated to high-temperature steam after heat exchange with hot salt in the third heat exchange tube, the steam distribution device B12 distributes high-temperature steam according to the wastewater treatment requirement and the quick load increasing requirement of the unit, when the steam turbine 3 needs to quickly increase the steam quantity, sufficient high-temperature steam is distributed to the steam turbine 3 to compensate the problem of slow increase of boiler steam, the other way is sent to the wastewater drying tower 13, the steam heat source and the wastewater are arranged in a countercurrent way, in order to ensure the evaporation drying effect, the two-stage tower arrangement is adopted, namely the wastewater drying tower 13 and the wastewater concentration tower 14, the high-temperature steam with higher parameters firstly dries the concentrated wastewater, the low-temperature steam enters the sixth heat exchange tube of the wastewater concentration tower 14 again after heat exchange, the wastewater is concentrated, the steam heat exchange adopts coil arrangement, the heated area is increased, the flow direction of the wastewater is from bottom to top, the countercurrent way is ensured, the low-temperature steam is changed into the wastewater storage tank 21, and the wastewater is completely heat exchanged, and the wastewater is circulated until the wastewater is completely cooled. The terminal waste water of whole factory that collects in the waste water holding vessel 17 carries waste water concentration tower 14 through waste water delivery pump 18, adopt the top to spray the mode and carry out heating concentration, concentrated waste water is collected in waste water concentration tower 14 bottom, carry waste water drying tower 13 through concentrated waste water delivery pump 16, adopt the top to spray the mode and carry out heating drying, various salt deposit in waste water drying tower 13 bottom after the drying, carry in waste water salt storage tank 22 through waste water salt delivery pump 15 and store, can supply cold salt storage tank 8 with the salt in the waste water salt storage tank 22 through molten salt make-up pump 23, in the hot salt storage tank 9, be used for supplementing the loss that the fused salt used, thereby realize recycle and the zero release of waste water product. In addition, the compressed air is introduced into the waste water drying tower 13 and the waste water concentration tower 14 through the compressed air storage tank 19, evaporated water vapor is taken away and blown into the hearth of the boiler 1, the environment is prevented from being polluted by external pollution, and the hearth is negative pressure due to the fact that the compressed air is positive pressure, the process is spontaneous flow, and a power device is not required to be added.
The application method of the cooperative peak shaving system for comprehensive utilization of the wastewater at the tail end of the power plant comprises the following steps:
when the load of the coal-fired unit needs to be quickly reduced, the change speed of the steam generated by the boiler 1 is slower than that of the steam required by the steam turbine 3, the steam generated by the boiler 1 is more than that of the steam required by the steam turbine 3, redundant steam is distributed to the heat exchanger A6 through the steam distribution device A2 for heating cold salt, and the fused salt heat storage system plays a role of absorbing redundant heat;
when the load of the coal-fired unit needs to be rapidly increased, the steam quantity generated by the boiler 1 is smaller than the steam quantity required by the steam turbine 3, and high-temperature steam generated by heating hot salt is distributed to the steam turbine 3 through the steam distribution device B12 to make up for the deficiency of the steam, and at the moment, the fused salt heat storage system bears the function of releasing heat;
when the coal-fired unit deeply peak-shaving, the operation load is lower than the lowest load, and as the lowest steam quantity generated by the boiler 1 is still more than the steam quantity required by the steam turbine 3, redundant steam is distributed to the heat exchanger A6 through the steam distribution device A2 for heating cold salt, and the fused salt heat storage system plays a role of absorbing redundant heat;
when the load of the coal-fired unit fluctuates rapidly or deeply, the stable steam heat source or the smoke heat source is difficult to obtain directly from the coal-fired unit, especially the current deep peak regulation time is long, and the heat source quality of the unit is low, and the wastewater treatment requirement is difficult to meet. Specifically, firstly, the tail end wastewater discharged at random is collected through a wastewater storage tank 17 and then is conveyed to a wastewater drying tower 13 and a wastewater concentration tower 14, the wastewater is concentrated and dried by utilizing the heat source degree of steam generated by a fused salt heat storage system, and the dried products of the wastewater are various potassium, sodium, sulfuric acid and chlorine salts, when the fused salt heat storage system is not available, the partial salts cannot be recycled because of complex components, and are difficult to treat, but the products are fused salt raw materials of the fused salt heat storage system, so that the fused salt heat storage system can collect the products and supplement the loss of the fused salt heat storage system, thereby realizing the comprehensive utilization of the products and finally achieving zero discharge;
the flexible peak regulation process not only solves the problem of unstable heat source in wastewater treatment in the prior art, but also comprehensively recycles the wastewater treatment product to a molten salt heat storage system to realize zero emission, has the characteristics of energy conservation, low carbon, environmental protection and the like, and has important significance and value for the construction and reconstruction of the zero emission of wastewater.
Parts or structures of the present invention, which are not specifically described, may be existing technologies or existing products, and are not described herein.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (10)
1. The utility model provides a terminal waste water comprehensive utilization cooperation peak shaving system of power plant which characterized in that includes:
the coal-fired unit power generation system is used for generating steam and realizing power generation;
the molten salt heat storage system is communicated with the coal-fired unit power generation system and is used for storing heat of the coal-fired unit power generation system and releasing the stored heat;
and the tail end wastewater treatment system is communicated with the molten salt heat storage system and is used for realizing wastewater treatment and wastewater product recycling by utilizing heat released by the molten salt heat storage system.
2. The system for comprehensively utilizing and cooperating peak shaving tail end wastewater of a power plant according to claim 1, wherein the power generation system of the coal-fired unit comprises a boiler, a steam turbine, a generator and a power grid, wherein the boiler combusts to generate steam, and the steam drives the steam turbine to rotate so as to drive the generator to generate power and transmit the power to the power grid.
3. The comprehensive utilization and cooperative peak shaving system for the tail end wastewater of the power plant according to claim 2, wherein the power generation system of the coal-fired unit further comprises a steam distribution device A, the steam distribution device A is communicated with a boiler, a steam turbine and a first heat exchange tube arranged in the heat exchanger A, and the first heat exchange tube is also communicated with the boiler.
4. The comprehensive utilization and cooperative peak shaving system for the tail end wastewater of the power plant according to claim 1, wherein the molten salt heat storage system comprises a heat exchanger A, a cold salt storage tank, a hot salt storage tank and a heat exchanger B, wherein a boiler, the cold salt storage tank and the hot salt storage tank of the power generation system of the coal-fired unit are respectively communicated with the heat exchanger A, steam from the boiler exchanges heat with cold salt from the cold salt storage tank in the heat exchanger A, the steam is condensed and returned to the boiler after heat exchange, the cold salt is converted into hot salt after heat exchange and is conveyed to the hot salt storage tank, the hot salt storage tank and the demineralized water storage tank are respectively communicated with the heat exchanger B, the hot salt from the hot salt storage tank exchanges heat with demineralized water from the demineralized water storage tank in the heat exchanger B, the hot salt is converted into cold salt after heat exchange, the cold salt returns to the cold salt storage tank for circulation, the demineralized water after heat exchange is converted into high-temperature steam, and the demineralized water can be distributed to a steam turbine and the tail end wastewater treatment system according to wastewater treatment requirements and quick load increase requirements of the unit.
5. The comprehensive utilization and cooperative peak shaving system for the tail end wastewater of the power plant according to claim 4, wherein the molten salt heat storage system further comprises a molten salt conveying pump A and a molten salt conveying pump B, the cold salt storage tank is communicated with a second heat exchange pipe arranged in the heat exchanger A through the molten salt conveying pump A, cold salt in the cold salt storage tank is conveyed into the second heat exchange pipe through the molten salt conveying pump A and exchanges heat with steam in a first heat exchange pipe arranged in the heat exchanger A, the second heat exchange pipe is communicated with a hot salt storage tank, the hot salt storage tank is communicated with a third heat exchange pipe arranged in the heat exchanger B through the molten salt conveying pump B and is further communicated with the cold salt storage tank, and hot salt in the hot salt storage tank is conveyed into the third heat exchange pipe through the molten salt conveying pump B and is used for heating desalted water from the desalted water storage tank and changing the desalted water into high-temperature steam.
6. The system for comprehensively utilizing and cooperating peak shaving at tail end of power plant according to claim 1, wherein the tail end wastewater treatment system comprises a wastewater drying tower, a wastewater concentrating tower, a wastewater storage tank, a desalted water storage tank and a wastewater salt production storage tank, wherein the wastewater concentrating tower is respectively communicated with the wastewater drying tower and the wastewater storage tank, the wastewater salt production storage tank is communicated with a cold salt storage tank, a hot salt storage tank and the wastewater drying tower, the wastewater collected in the wastewater storage tank is conveyed to the wastewater concentrating tower for concentrating and then conveyed to the wastewater drying tower, the high-temperature steam enters the wastewater drying tower for drying the concentrated wastewater, the high-temperature steam is changed into low-temperature steam after heat exchange and then enters the wastewater concentrating tower for concentrating the wastewater, the low-temperature steam is condensed back to the desalted water storage tank for circulation after heat exchange, and the wastewater is conveyed to the wastewater salt production storage tank for circulation after drying.
7. The system for the comprehensive utilization and cooperative peak shaving of the tail end waste water of a power plant according to claim 6, wherein the tail end waste water treatment system further comprises a steam distribution device B, a waste water salt delivery pump, a concentrated waste water delivery pump, a demineralized water delivery pump and a molten salt replenishing pump, the bottom of the waste water drying tower is communicated with a waste water salt storage tank through the waste water salt delivery pump, the bottom of the waste water concentration tower is communicated with the top of the waste water drying tower through the concentrated waste water delivery pump, the waste water storage tank is communicated with the top of the waste water concentration tower through the waste water delivery pump, the demineralized water storage tank is communicated with a fourth heat exchange pipe built in the heat exchanger B through the demineralized water delivery pump and is further communicated with a steam distribution device B, the demineralized water in the demineralized water storage tank is heated into high-temperature steam after being delivered into the fourth heat exchange pipe through the demineralized water delivery pump, the steam distribution device B distributes the high-temperature steam to the turbine and the waste water drying tower according to the waste water treatment requirement and the quick load increasing requirement of the unit, and sufficient high-temperature steam is distributed to the turbine when the quick increase of the steam amount is required, and the demineralized water storage tank is communicated with the cold water storage tank through the salt replenishing pump and the heat storage tank.
8. The system for comprehensively utilizing and cooperating peak shaving tail end waste water of a power plant according to claim 6, wherein the tail end waste water treatment system further comprises a compressed air storage tank, the compressed air storage tank is communicated with the waste water drying tower and the waste water concentration tower, compressed air is introduced into the waste water drying tower and the waste water concentration tower by the compressed air storage tank, evaporated water vapor is taken away and blown into a hearth of the boiler, the environment is prevented from being polluted by external pollution, the compressed air is positive pressure, and the hearth is negative pressure.
9. The system for comprehensively utilizing and cooperating peak shaving tail end waste water of a power plant according to claim 6, wherein a fifth heat exchange tube is arranged in the waste water drying tower, a sixth heat exchange tube is arranged in the waste water concentrating tower, the bottom end of the fifth heat exchange tube is communicated with the steam distribution device B, the top end of the fifth heat exchange tube is communicated with the bottom end of the sixth heat exchange tube, and the top end of the sixth heat exchange tube is communicated with the desalted water storage tank.
10. The application method of the cooperative peak shaving system for comprehensive utilization of the wastewater at the tail end of the power plant is characterized by comprising the following steps of:
when the load of the coal-fired unit needs to be quickly reduced, the steam quantity generated by the boiler is more than that required by the steam turbine, redundant steam is distributed to the heat exchanger A through the steam distribution device A for heating cold salt, and the fused salt heat storage system plays a role of absorbing redundant heat;
when the load of the coal-fired unit needs to be rapidly increased, the steam quantity generated by the boiler is smaller than the steam quantity required by the steam turbine, high-temperature steam generated by heating hot salt is distributed to the steam turbine through the steam distribution device B so as to make up for the deficiency of the steam, and at the moment, the fused salt heat storage system bears the function of releasing heat;
when the coal-fired unit deeply peak-shaving, the operation load is lower than the lowest load, and the lowest steam quantity generated by the boiler is still more than the steam quantity required by the steam turbine, redundant steam is distributed to the heat exchanger A through the steam distribution device A for heating cold salt, and the fused salt heat storage system plays a role of absorbing redundant heat;
when the load of the coal-fired unit fluctuates rapidly or deeply, the fused salt heat storage system is used for storing heat in the flexible peak regulation process of the coal-fired unit, a stable heat source is provided for wastewater treatment after the stored heat is released, the wastewater is concentrated and dried, the dependence of the wastewater treatment on the running condition of the coal-fired unit is reduced, and the product generated by the wastewater is recycled to the fused salt heat storage system and used for supplementing the loss of the fused salt heat storage system, so that zero emission is finally achieved.
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| CN117575258A (en) * | 2023-11-27 | 2024-02-20 | 中国电力工程顾问集团有限公司 | Coal-fired power plant deep peak shaving method and device considering wastewater treatment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117575258A (en) * | 2023-11-27 | 2024-02-20 | 中国电力工程顾问集团有限公司 | Coal-fired power plant deep peak shaving method and device considering wastewater treatment |
| CN117575258B (en) * | 2023-11-27 | 2024-05-10 | 中国电力工程顾问集团有限公司 | Coal-fired power plant deep peak shaving method and device considering wastewater treatment |
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