CN117870207A - Peak cooling system coupled with electrochemical energy storage and heat pump and operation method - Google Patents
Peak cooling system coupled with electrochemical energy storage and heat pump and operation method Download PDFInfo
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- CN117870207A CN117870207A CN202410082629.9A CN202410082629A CN117870207A CN 117870207 A CN117870207 A CN 117870207A CN 202410082629 A CN202410082629 A CN 202410082629A CN 117870207 A CN117870207 A CN 117870207A
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- 238000001816 cooling Methods 0.000 title claims abstract description 132
- 238000012983 electrochemical energy storage Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 150
- 238000005057 refrigeration Methods 0.000 claims abstract description 33
- 230000005611 electricity Effects 0.000 claims description 11
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 abstract description 12
- 239000003570 air Substances 0.000 description 42
- 230000033228 biological regulation Effects 0.000 description 12
- 230000001603 reducing effect Effects 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010795 Steam Flooding Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
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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
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- 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
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Water Supply & Treatment (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses an electrochemical energy storage-heat pump coupled peak cooling system and an operation method thereof, wherein the system comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, an electrochemical energy storage system, a power grid, an indirect air cooling system, a refrigeration heat pump system, a peak cooling heat exchanger, a condenser and a condensate pump; the boiler is connected with the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the generator in series in sequence, the generator is connected with the electrochemical energy storage system and the power grid, the electrochemical energy storage system is connected with the refrigeration heat pump system, the refrigeration heat pump system is connected with the peak cooling heat exchanger, the peak cooling heat exchanger is connected with the indirect air cooling system, the indirect air cooling system and the low-pressure cylinder are connected with the condenser, and the condenser is connected with the boiler through the condensate pump. The advantages are that: the electrochemical energy storage is used for supplying power to drive the heat pump, so that the running back pressure and the energy consumption of the unit are reduced, and compared with the prior art, the full life cycle zero water consumption is realized, the influence on a steam-water system of the steam turbine is avoided, the investment is low, and the system is simple and safe.
Description
Technical Field
The invention relates to the technical field of energy conservation and consumption reduction of coal-fired units, in particular to an electrochemical energy storage-heat pump coupled peak cooling system and an operation method.
Background
The air cooling unit of the thermal power plant has very remarkable water saving effect, is popularized and has great significance for fully utilizing abundant coal resources and limited water resources in northwest regions and promoting the stable development of the power industry. According to the heat exchange form of cooling air and dead steam of a power station, the air cooling system can be divided into direct air cooling and indirect air cooling. The direct air cooling unit is characterized in that cooling air passes through an air cooling condenser through driving of a fan, and dead steam of a power station in the tube bundle of the air cooling condenser is condensed; the indirect air cooling unit takes circulating water as a cooling medium, a radiator is additionally arranged on the periphery of a natural ventilation cooling tower, ambient air is driven by suction force of the air cooling tower, high-temperature circulating water from an outlet of a condenser of a power station to the air cooling tower is cooled by sweeping the radiator, and low-temperature circulating water from the outlet of the air cooling tower is driven by a circulating water pump and enters the condenser of the power station to condense steam turbine exhaust steam.
The air cooling unit is high in operation back pressure and rises along with the rise of the ambient temperature, when the temperature in summer is too high, the unit can not fully run, if the summer high-temperature unit is fully run, the required air cooling heat dissipation area is large, the investment is greatly increased, meanwhile, the cooling area of the unit in winter is excessive, the unit is easily frozen in low-load operation, and the operation safety of the unit is affected. If the butterfly valve is added to achieve the anti-freezing purpose, not only is the investment increased, but also the easy leakage point of the system is increased. Therefore, the condition of unsatisfactory engine in summer is an inherent characteristic of the air cooling unit.
In order to reduce the running back pressure and energy consumption of the indirect air cooling unit, the following solutions are generally adopted. Scheme 1: cold water is sprayed on the surface of the radiator of the air cooling tower. Pumping low-temperature underground water or naturally cooling low-temperature water at night, spraying the low-temperature underground water or the low-temperature water at night on the outer surface of the air-cooled radiator in an atomization mode through each branch pipe and each nozzle, and achieving the purpose of reducing the air temperature of the inlet of the radiator. The technical principle of the scheme is simple, the investment is less, and the scheme has the defects of consuming a large amount of water resources and easily aggravating the surface dirt degree of the radiator of the air cooling tower, and conversely weakening the back pressure reducing effect. Scheme 2: a spike cooling system is added. The tube bundle type or plate type heat exchanger is additionally arranged, water is introduced into the condenser of the power station and discharged from the condenser, air flows through the outside, and cooling water is sprayed at the same time. And the partial condenser is shunted to be discharged to a peak cooling system, so that the heat load of the original air cooling system is reduced, and the purposes of improving the operation vacuum and reducing the energy consumption are achieved. However, the disadvantages of high water consumption and high investment exist, and the application of the method is limited. In summary, both of the above schemes consume a large amount of water resources.
Disclosure of Invention
The invention aims to provide an electrochemical energy storage-heat pump coupled peak cooling system and an operation method thereof, so as to solve the problems in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
an electrochemical energy storage-heat pump coupled peak cooling system comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, an electrochemical energy storage system, a power grid, an indirect air cooling system, a refrigeration heat pump system, a peak cooling heat exchanger, a condenser and a condensate pump;
the primary hot steam output end of the boiler is connected with the input end of a high-pressure cylinder, the output end of the high-pressure cylinder is connected with the reheat steam input end of the boiler, the reheat steam output end of the boiler is connected with the input end of a medium-pressure cylinder, the output end of the medium-pressure cylinder is connected with the input end of a low-pressure cylinder, the output end of the low-pressure cylinder is connected with the input end of a generator and the input end of a condenser, the output end of the generator is connected with a power grid and the input end of an electrochemical energy storage system, the output end of the electrochemical energy storage system is connected with the power supply end of a refrigeration heat pump system, and the water inlet end and the water outlet end of the refrigeration heat pump system are respectively connected with the cold side water outlet end and the cold side water inlet end of the peak cooling heat exchanger;
the output end of the condenser is connected with the primary hot steam input end of the boiler through a condensate pump; the water inlet end and the water outlet end of the condenser are respectively connected with the output end and the input end of the indirect air cooling system; the hot side water inlet end of the peak cooling heat exchanger is connected to the connecting pipeline of the output end of the indirect air cooling system, and the hot side water outlet end of the peak cooling heat exchanger is connected to the connecting pipeline of the water inlet end of the condenser.
Preferably, a low-pressure heater group, a deaerator, a water supply pump and a high-pressure heater group are sequentially arranged on a connecting pipeline between the condensate pump and the primary hot steam input end of the boiler along the condensate pump towards the boiler.
Preferably, the hot side water inlet end of the peak cooling heat exchanger is connected to a connecting pipeline of the output end of the indirect air cooling system through a hot side water inlet pipeline, and the hot side water outlet end of the peak cooling heat exchanger is connected to a connecting pipeline of the water inlet end of the condenser through a hot side water outlet pipeline;
the hot side water inlet pipeline is sequentially provided with a peak cooling inlet shutoff valve and a peak cooling circulating pump along the internal water flow direction; and a peak cooling outlet shutoff valve is arranged on the hot side water outlet pipeline.
Preferably, the cold side water inlet end and the cold side water outlet end of the peak cooling heat exchanger are respectively connected with the water outlet end and the water inlet end of the refrigeration heat pump system through a cold side water inlet pipe and a cold side water outlet pipe.
Preferably, a circulating water pump is arranged on a connecting pipeline between the water outlet end of the condenser and the input end of the indirect air cooling system.
Preferably, the electrochemical energy storage system is used for storing the generated electricity of the generator and providing a power source for the refrigeration heat pump system.
The invention also aims to provide an operation method of the peak cooling system coupled with the electrochemical energy storage and heat pump, wherein after the primary hot steam in the boiler works through the high-pressure cylinder, part of the steam is reheated and warmed and then sequentially drives the generator through the medium-pressure cylinder and the low-pressure cylinder to generate electricity, part of electricity generated by the generator is used by a power supply network, and the other part of electricity is stored in the electrochemical energy storage system;
the electric power in the electrochemical energy storage system drives the refrigeration heat pump system to produce cold water, and the produced cold water exchanges heat with condensation water produced by the indirect air cooling system in the peak cooler; the low-temperature water generated by the refrigeration heat pump system enters the peak cooling heat exchanger to release cold energy and then returns to the refrigeration heat pump system; part of condensed water generated by the indirect air cooling system is cooled in the peak cooling heat exchanger and then mixed with the other part of condensed water, and then enters the condenser, and after heat exchange in the condenser, the condensed water enters the indirect air cooling system again for cooling;
the steam after the low-pressure cylinder does work enters a condenser to be condensed into water, and enters a boiler after passing through a condensate pump, a low-pressure heater group, a deaerator, a water supply pump and a high-pressure heater group.
The beneficial effects of the invention are as follows: 1. and the electric power in the electrochemical energy storage drives the refrigeration heat pump to produce cold water, and the cold water exchanges heat with condensation water of the air cooling system in the peak cooling heat exchanger. The outlet low-temperature water of the refrigeration heat pump enters the peak cooling heat exchanger to release cold energy, and then returns to the refrigeration heat pump through the inlet pipe. And after being cooled in the peak cooling heat exchanger, one part of condensed water generated by the air cooling system is mixed with the other part of condensed water, and finally enters the condenser, so that the temperature of condensed water at an inlet of the condenser is reduced, and the purposes of reducing running back pressure and unit energy consumption are realized. The method can reduce the running back pressure and the energy consumption of the unit, can keep the full life cycle with zero water consumption, and has remarkable energy-saving effect. 2. The electrochemical energy storage is used for supplying power to drive the heat pump, so that the running back pressure and the energy consumption of the unit are reduced, and compared with the existing water consumption type peak cooling technology, the full life cycle zero water consumption is realized; compared with the peak cooling technology of a steam turbine steam driven heat pump, the peak cooling technology has no influence on a steam turbine steam-water system, and is low in investment, simple and safe in system. 3. The electrochemical energy storage increases the peak regulation range of the unit, the peak regulation speed of the unit is high, and the flexibility of the unit is improved. After peak regulation, the service life of the boiler and auxiliary equipment is not influenced. 4. When the thermal power generating unit is in peak regulation, the boiler actually runs above the lowest stable combustion load, and the problems of stable combustion under low load, dry-wet state switching, low flue gas temperature at the SCR denitration inlet, overtemperature of a heating surface, vibration of rotating equipment and the like can not occur in the boiler, so that the service lives of the boiler and auxiliary machines of the boiler are not influenced.
Drawings
FIG. 1 is a block diagram of a spike cooling system in an embodiment of the invention.
In the figure: 1. a boiler; 2. a high-pressure cylinder; 3. a medium pressure cylinder; 4. a low pressure cylinder; 5. a generator; 6. an electrochemical energy storage system; 7. a power grid; 8. an indirect air cooling system; 9. a refrigeration heat pump system; 10. spike cooling circulation pump; 11. spike cooling inlet shutoff valve; 12. spike cooling heat exchanger; 13. spike cooling outlet shutoff valve; 14. a circulating water pump; 15. a condenser; 16. a condensate pump; 17. a low pressure heater group; 18. a deaerator; 19. a water feed pump; 20. a high pressure heater group.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description is presented by way of example only and is not intended to limit the invention.
As shown in fig. 1, in this embodiment, an electrochemical energy storage-heat pump coupled spike cooling system is provided,
the system comprises a boiler 1, a high-pressure cylinder 2, a medium-pressure cylinder 3, a low-pressure cylinder 4, a generator 5, an electrochemical energy storage system 6, a power grid 7, an indirect air cooling system 8, a refrigeration heat pump system 9, a peak cooling heat exchanger 12, a condenser 15 and a condensate pump 16;
the primary hot steam output end of the boiler 1 is connected with the input end of the high-pressure cylinder 2 through a pipeline, the output end of the high-pressure cylinder 2 is connected with the reheat steam input end of the boiler 1 through a pipeline, the reheat steam output end of the boiler 1 is connected with the input end of the medium-pressure cylinder 3 through a pipeline, the output end of the medium-pressure cylinder 3 is connected with the input end of the low-pressure cylinder 4, the output end of the low-pressure cylinder 4 is connected with the input end of the generator 5 and the input end of the condenser 15, the output end of the generator 5 is connected with the power grid 7 and the input end of the electrochemical energy storage system 6, the output end of the electrochemical energy storage system 6 is connected with the power supply end of the refrigeration heat pump system 9, and the water inlet end and the water outlet end of the refrigeration heat pump system 9 are respectively connected with the cold side water outlet end and the cold side water inlet end of the peak cooling heat exchanger 12;
the output end of the condenser 15 is connected with the primary hot steam input end of the boiler 1 through a condensate pump 16; the water inlet end and the water outlet end of the condenser 15 are respectively connected with the output end and the input end of the indirect air cooling system 8; the hot side water inlet end of the peak cooling heat exchanger 12 is connected to a connecting pipe of the output end of the indirect air cooling system 8, and the hot side water outlet end of the peak cooling heat exchanger 12 is connected to a connecting pipe of the water inlet end of the condenser 15. Referring to fig. 1, specifically, since the output end of the indirect air cooling system 8 is communicated with the water inlet end of the condenser 15, the pipes to which the hot side water inlet end and the hot side water outlet end of the spike cooling heat exchanger 12 are connected are the same pipe.
In this embodiment, a low-pressure heater group 17, a deaerator 18, a water feed pump 19 and a high-pressure heater group 20 are sequentially arranged along the direction from the condensate pump 16 to the boiler 1 on a connecting pipeline between the condensate pump 16 and the primary hot steam input end of the boiler 1.
In the present embodiment, the spike cooling heat exchanger 12 is provided with a cold side and a hot side, specifically: the hot side comprises a hot side water inlet end and a hot side water outlet end, the hot side water inlet end of the peak cooling heat exchanger 12 is connected with a connecting pipeline of the output end of the indirect air cooling system 8 through a hot side water inlet pipeline, and the hot side water outlet end of the peak cooling heat exchanger 12 is connected with a connecting pipeline of the water inlet end of the condenser 15.
The hot-side water inlet pipeline is sequentially provided with a peak cooling inlet shutoff valve 11 and a peak cooling circulating pump 10 along the internal water flow direction; the hot side water outlet pipeline is provided with a peak cooling outlet shutoff valve 13.
The cold side comprises a cold side water inlet end and a cold side water outlet end, and the cold side water inlet end and the cold side water outlet end of the peak cooling heat exchanger 12 are respectively connected with the water outlet end and the water inlet end of the refrigeration heat pump system 9 through a cold side water inlet pipe and a cold side water outlet pipe.
In this embodiment, a circulating water pump 14 is disposed on a connection pipeline between the water outlet end of the condenser 15 and the input end of the indirect air cooling system 8. The circulation of water between the two is driven by the circulation water pump 14.
In this embodiment, the electrochemical energy storage system 6 is configured to store the generated electricity of the generator 5 and provide a power source for the refrigeration heat pump system 9.
In this embodiment, the operation method of the peak cooling system coupled by the electrochemical energy storage-heat pump specifically includes: after the primary hot steam in the boiler 1 works through the high-pressure cylinder 2, part of the steam is reheated and heated, and then sequentially drives the generator 5 through the medium-pressure cylinder 3 and the low-pressure cylinder 4 to generate electricity, part of electricity generated by the generator 5 is used by the power supply network 7, and the other part of electricity is stored in the electrochemical energy storage system 6;
the electric power in the electrochemical energy storage system 6 drives the refrigeration heat pump system 9 to produce cold water, and the produced cold water exchanges heat with condensation water generated by the indirect air cooling system 8 in the peak cooler; the low-temperature water generated by the refrigeration heat pump system 9 enters the peak cooling heat exchanger 12 to release cold energy, and then returns to the refrigeration heat pump system 9; part of condensed water generated by the indirect air cooling system 8 is cooled in the peak cooling heat exchanger 12 and then mixed with the other part of condensed water to enter the condenser 15, so that the temperature of condensed water at the inlet of the condenser is reduced, and the purposes of reducing running back pressure and unit energy consumption are realized;
the steam after the low pressure cylinder 4 is worked enters the condenser 15 to be condensed into water, and enters the boiler 1 after passing through the condensate pump 16, the low pressure heater group 17, the deaerator 18, the water feed pump 19 and the high pressure heater group 20.
In this embodiment, when the unit needs to quickly reduce the load and meets the primary frequency modulation instruction, the electrochemical energy storage system 6 absorbs electric quantity from the output end of the generator 5, reduces the on-line electric load, and quickly responds to the requirement of the power grid 7.
In this embodiment, when the unit needs to increase the load rapidly, and the primary frequency modulation instruction is satisfied, the electrochemical energy storage system 6 releases the electric quantity, increases the on-line electric load rapidly, and responds to the requirement of the power grid 7 rapidly.
In the embodiment, the electrochemical energy storage electric drive heat pump is adopted, steam extraction in a turbine thermodynamic system is not needed, and the aims of operating vacuum lifting and reducing energy consumption of a unit are achieved under the condition that the work of a turbine is not reduced. If the steam drives the heat pump, additional steam is required to be extracted from the steam turbine, so that the power generated by the steam turbine is reduced. The electrochemical energy storage increases the peak regulation range of the unit, the peak regulation speed of the unit is high, and the flexibility of the unit is improved. After peak regulation, the service lives of the boiler 1 and auxiliary equipment are not influenced. When the thermal power generating unit is in peak regulation, the boiler 1 actually operates above the lowest stable combustion load, and the problems of stable combustion under low load, dry-wet state switching, low flue gas temperature at the SCR denitration inlet, overtemperature of a heating surface, vibration of rotating equipment and the like of the boiler 1 can be avoided, so that the service lives of the boiler 1 and auxiliary machines of the boiler are not influenced.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained:
the invention discloses an electrochemical energy storage-heat pump coupled peak cooling system and an operation method thereof. The outlet low-temperature water of the refrigeration heat pump enters the peak cooling heat exchanger to release cold energy, and then returns to the refrigeration heat pump through the inlet pipe. And after being cooled in the peak cooling heat exchanger, one part of condensed water generated by the air cooling system is mixed with the other part of condensed water, and finally enters the condenser, so that the temperature of condensed water at an inlet of the condenser is reduced, and the purposes of reducing running back pressure and unit energy consumption are realized. The method can reduce the running back pressure and the energy consumption of the unit, can keep the full life cycle with zero water consumption, and has remarkable energy-saving effect. The electrochemical energy storage is used for supplying power to drive the heat pump, so that the running back pressure and the energy consumption of the unit are reduced, and compared with the existing water consumption type peak cooling technology, the full life cycle zero water consumption is realized; compared with the peak cooling technology of a steam turbine steam driven heat pump, the peak cooling technology has no influence on a steam turbine steam-water system, and is low in investment, simple and safe in system. The electrochemical energy storage increases the peak regulation range of the unit, the peak regulation speed of the unit is high, and the flexibility of the unit is improved. After peak regulation, the service life of the boiler and auxiliary equipment is not influenced. When the thermal power generating unit is in peak regulation, the boiler actually runs above the lowest stable combustion load, and the problems of stable combustion under low load, dry-wet state switching, low flue gas temperature at the SCR denitration inlet, overtemperature of a heating surface, vibration of rotating equipment and the like can not occur in the boiler, so that the service lives of the boiler and auxiliary machines of the boiler are not influenced.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which is also intended to be covered by the present invention.
Claims (7)
1. An electrochemical energy storage-heat pump coupled peak cooling system, characterized by: the system comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, an electrochemical energy storage system, a power grid, an indirect air cooling system, a refrigeration heat pump system, a peak cooling heat exchanger, a condenser and a condensate pump;
the primary hot steam output end of the boiler is connected with the input end of a high-pressure cylinder, the output end of the high-pressure cylinder is connected with the reheat steam input end of the boiler, the reheat steam output end of the boiler is connected with the input end of a medium-pressure cylinder, the output end of the medium-pressure cylinder is connected with the input end of a low-pressure cylinder, the output end of the low-pressure cylinder is connected with the input end of a generator and the input end of a condenser, the output end of the generator is connected with a power grid and the input end of an electrochemical energy storage system, the output end of the electrochemical energy storage system is connected with the power supply end of a refrigeration heat pump system, and the water inlet end and the water outlet end of the refrigeration heat pump system are respectively connected with the cold side water outlet end and the cold side water inlet end of the peak cooling heat exchanger;
the output end of the condenser is connected with the primary hot steam input end of the boiler through a condensate pump; the water inlet end and the water outlet end of the condenser are respectively connected with the output end and the input end of the indirect air cooling system; the hot side water inlet end of the peak cooling heat exchanger is connected to the connecting pipeline of the output end of the indirect air cooling system, and the hot side water outlet end of the peak cooling heat exchanger is connected to the connecting pipeline of the water inlet end of the condenser.
2. The electrochemical energy storage-heat pump coupled spike cooling system of claim 1 wherein: on the connecting pipeline between condensate pump and the initial hot steam input of boiler, set gradually low pressure heater group, deaerator, feed pump and high pressure heater group along the condensate pump to the direction of boiler.
3. The electrochemical energy storage-heat pump coupled spike cooling system of claim 1 wherein: the hot side water inlet end of the peak cooling heat exchanger is connected to a connecting pipeline of the output end of the indirect air cooling system through a hot side water inlet pipeline, and the hot side water outlet end of the peak cooling heat exchanger is connected to a connecting pipeline of the water inlet end of the condenser through a hot side water outlet pipeline;
the hot side water inlet pipeline is sequentially provided with a peak cooling inlet shutoff valve and a peak cooling circulating pump along the internal water flow direction; and a peak cooling outlet shutoff valve is arranged on the hot side water outlet pipeline.
4. The electrochemical energy storage-heat pump coupled spike cooling system of claim 1 wherein: the cold side water inlet end and the cold side water outlet end of the peak cooling heat exchanger are respectively connected with the water outlet end and the water inlet end of the refrigeration heat pump system through a cold side water inlet pipe and a cold side water outlet pipe.
5. The electrochemical energy storage-heat pump coupled spike cooling system of claim 1 wherein: and a circulating water pump is arranged on a connecting pipeline between the water outlet end of the condenser and the input end of the indirect air cooling system.
6. The electrochemical energy storage-heat pump coupled spike cooling system of claim 1 wherein: the electrochemical energy storage system is used for storing the generated electric quantity of the generator and providing a power source for the refrigeration heat pump system.
7. A method of operating an electrochemical energy storage-heat pump coupled spike cooling system, characterized by: after the primary hot steam in the boiler works through a high-pressure cylinder, part of the steam is reheated and heated, and then the steam sequentially drives a generator through a medium-pressure cylinder and a low-pressure cylinder to generate electricity, part of electricity generated by the generator is used by a power supply network, and the other part of electricity is stored in an electrochemical energy storage system;
the electric power in the electrochemical energy storage system drives the refrigeration heat pump system to produce cold water, and the produced cold water exchanges heat with condensation water produced by the indirect air cooling system in the peak cooler; the low-temperature water generated by the refrigeration heat pump system enters the peak cooling heat exchanger to release cold energy and then returns to the refrigeration heat pump system; part of condensed water generated by the indirect air cooling system is cooled in the peak cooling heat exchanger and then mixed with the other part of condensed water, and then enters the condenser, and after heat exchange in the condenser, the condensed water enters the indirect air cooling system again for cooling;
the steam after the low-pressure cylinder does work enters a condenser to be condensed into water, and enters a boiler after passing through a condensate pump, a low-pressure heater group, a deaerator, a water supply pump and a high-pressure heater group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410082629.9A CN117870207A (en) | 2024-01-19 | 2024-01-19 | Peak cooling system coupled with electrochemical energy storage and heat pump and operation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410082629.9A CN117870207A (en) | 2024-01-19 | 2024-01-19 | Peak cooling system coupled with electrochemical energy storage and heat pump and operation method |
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| CN117870207A true CN117870207A (en) | 2024-04-12 |
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| CN109579112A (en) * | 2019-01-07 | 2019-04-05 | 清华大学 | A kind of thermal power plant unit thermoelectricity decoupled system and its operation method |
| CN113624027A (en) * | 2021-09-09 | 2021-11-09 | 西安热工研究院有限公司 | System and method for reducing summer operation backpressure of indirect air cooling unit |
| CN216077238U (en) * | 2021-11-11 | 2022-03-18 | 武汉市无穷大能源科技有限公司 | Energy-saving steam turbine power generation device |
| CN114877397A (en) * | 2022-05-11 | 2022-08-09 | 三河发电有限责任公司 | Coal-fired heating system |
| CN116031934A (en) * | 2023-01-09 | 2023-04-28 | 西安交通大学 | Nuclear-based multi-energy complementary comprehensive energy system and operation method thereof |
| JP3242127U (en) * | 2023-02-22 | 2023-05-29 | 中国長江三峡集団有限公司 | Power storage and heat storage system |
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| CN109579112A (en) * | 2019-01-07 | 2019-04-05 | 清华大学 | A kind of thermal power plant unit thermoelectricity decoupled system and its operation method |
| CN113624027A (en) * | 2021-09-09 | 2021-11-09 | 西安热工研究院有限公司 | System and method for reducing summer operation backpressure of indirect air cooling unit |
| CN216077238U (en) * | 2021-11-11 | 2022-03-18 | 武汉市无穷大能源科技有限公司 | Energy-saving steam turbine power generation device |
| CN114877397A (en) * | 2022-05-11 | 2022-08-09 | 三河发电有限责任公司 | Coal-fired heating system |
| CN116031934A (en) * | 2023-01-09 | 2023-04-28 | 西安交通大学 | Nuclear-based multi-energy complementary comprehensive energy system and operation method thereof |
| JP3242127U (en) * | 2023-02-22 | 2023-05-29 | 中国長江三峡集団有限公司 | Power storage and heat storage system |
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