CN117759360A - Coal-fired power plant depth peak shaving power generation system based on compressed air energy storage - Google Patents
Coal-fired power plant depth peak shaving power generation system based on compressed air energy storage Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 38
- 238000010248 power generation Methods 0.000 title claims abstract description 18
- 238000005338 heat storage Methods 0.000 claims abstract description 42
- 150000003839 salts Chemical class 0.000 claims abstract description 23
- 230000001502 supplementing effect Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 abstract description 12
- 238000007906 compression Methods 0.000 description 13
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- 230000006835 compression Effects 0.000 description 7
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- 238000005457 optimization Methods 0.000 description 2
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- 238000003303 reheating Methods 0.000 description 2
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Abstract
The invention discloses a compressed air energy storage system coupled with a coal-fired power plant and an operation method thereof. The compressed air energy storage unit comprises an air compressor and a first heat exchanger connected with the air compressor, wherein a high-pressure gas outlet of the first heat exchanger is connected with a gas storage, and a high-temperature medium outlet of the first heat exchanger is connected with a high-temperature heat storage tank; the compressed air energy release unit comprises a second heat exchanger connected with an air outlet of the air storage, and an air turbine is arranged at the outlet of the second heat exchanger; the high-temperature molten salt heat supplementing unit comprises a third heat exchanger arranged between the second heat exchanger and the air turbine, and a high-temperature inlet of the third heat exchanger is connected with a fourth heat exchanger. According to the invention, after the exhaust heat of the compressor is recovered, an external heat source is introduced, so that the temperature of air at the inlet of the turbine is further increased, and higher air turbine output and power generation efficiency are achieved.
Description
Technical Field
The invention belongs to the technical field of thermal power generation and compressed air energy storage, and particularly relates to a coal-fired power plant deep peak shaving power generation system based on compressed air energy storage.
Background
Currently, the power industry in China still takes a coal motor unit as a main part, and if the aim of double carbon is to be achieved, a novel power system taking new energy as a main part is built in the future, namely the specific gravity of renewable energy sources is increased on the basis of the prior art. With the improvement of energy structure optimization and environmental protection requirements, the thermal power generating unit needs to further improve peak shaving performance, improve efficiency, save energy and reduce emission so as to adapt to the requirement of new energy access to a power grid. The deep peak regulation reformation of the unit comprises reformation of main and auxiliary systems of a boiler and a turbine side, and the current technical route is generally to use a peak regulation target as a guiding furnace and machine following mode, and the reformation of main and auxiliary equipment and systems is implemented under the guiding of the peak regulation target. Compared with a steam turbine system, the boiler system peak regulation depth limiting factors are more, the conditions are more complex, the corresponding boiler side is modified, and a system, integral and comprehensive modification scheme is lacked, so that the coal motor unit can perform the deep peak regulation operation with the loss of the service life of the unit, the safety risk and the sacrifice of economy.
the energy storage technology is one of key technologies for supporting the large-scale development of new energy and guaranteeing the energy safety in China. The compressed air energy storage is to store energy by taking compressed air as a carrier, and is a novel electric energy storage technology with low cost and large capacity. When the compressed energy is stored, the compressor is driven by utilizing the abandoned wind, abandoned light, off-peak electricity and the like, so that the air is compressed into high-pressure air and stored in the air storage. Meanwhile, compression heat in the compression process is recovered by a heat storage medium through a heat exchanger and stored in a heat storage system, so that decoupling storage is completed. During expansion energy release, high-pressure air is released through a turbine expansion system to generate electricity, and the recovered compression heat energy is utilized to supplement heat in the expansion process, so that the coupling energy release of air pressure potential energy and compression heat energy is completed.
As the advanced peak regulation working time of China is short, the technology and experience are generally insufficient, not only the energy consumption level of the unit is greatly increased and the economical efficiency is reduced, but also the equipment is damaged, and the safe and stable operation is endangered. How to couple a compressed air energy storage system with a coal-fired power plant, so that the peak shaving capacity and flexibility of the coal-fired power plant are improved, and the low-carbonization transformation of a power-assisted power system is a problem to be solved urgently at present.
Disclosure of Invention
in order to solve the technical problems, the invention provides a coal-fired power plant depth peak shaving system structure based on compressed air energy storage, which realizes safe, stable and economic operation under unit depth peak shaving.
in order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a coal-fired power plant deep peak shaving power generation system based on compressed air energy storage comprises a compressed air energy storage unit, a compressed air energy release unit and a high-temperature molten salt heat supplementing unit.
the compressed air energy storage unit comprises an air compressor and a first heat exchanger connected with the air compressor, wherein a high-pressure gas outlet of the first heat exchanger is connected with a gas storage, and a high-temperature medium outlet of the first heat exchanger is connected with a high-temperature heat storage tank;
the compressed air energy release unit comprises a second heat exchanger connected with an air outlet of the air storage, an air turbine is arranged at the outlet of the second heat exchanger and drives and connects with a generator, and a high-temperature medium inlet and a low-temperature medium outlet of the second heat exchanger are respectively connected with the high-temperature heat storage tank and a low-temperature heat storage tank;
the high-temperature molten salt heat supplementing unit comprises a third heat exchanger arranged between the second heat exchanger and the air turbine, and a high-temperature inlet of the third heat exchanger is connected with a fourth heat exchanger.
preferably, the air compressor at least comprises a first-stage air compressor and a second-stage air compressor, the first heat exchanger at least comprises a first-stage first heat exchanger and a second-stage first heat exchanger, wherein an air inlet of the first-stage air compressor is communicated with outside air, an air outlet of the first-stage air compressor is connected with the first-stage first heat exchanger, an air outlet of the first-stage first heat exchanger is connected with the second-stage air compressor, an air outlet of the second-stage air compressor is connected with the second-stage first heat exchanger, and an air outlet of the second-stage first heat exchanger is communicated with the air reservoir; and the high-temperature medium outlets of the first-stage first heat exchanger and the second-stage first heat exchanger are connected with the high-temperature heat storage tank.
Preferably, the second heat exchanger comprises at least a first-stage second heat exchanger and a second-stage second heat exchanger, the air turbine comprises at least a first-stage air turbine and a second-stage air turbine, and the third heat exchanger comprises at least a first-stage third heat exchanger and a second-stage third heat exchanger; the air inlet of the first-stage second heat exchanger is communicated with the air storage, the air outlet of the first-stage second heat exchanger is connected with the air inlet of the first-stage air turbine through the first-stage third heat exchanger, the air outlet of the first-stage air turbine is connected with the air inlet of the second-stage second heat exchanger, the air outlet of the second-stage second heat exchanger is connected with the air inlet of the second-stage air turbine through the second-stage third heat exchanger, and the second-stage air turbine is driven to be connected with the generator.
Preferably, the high-temperature medium outlet of the high-temperature heat storage tank is connected with the high-temperature inlets of the first-stage second heat exchanger and the second-stage second heat exchanger respectively, the low-temperature outlets of the first-stage second heat exchanger and the second-stage second heat exchanger are connected with the low-temperature inlet of the low-temperature heat storage tank respectively, and the low-temperature outlet of the low-temperature heat storage tank is connected with the low-temperature inlets of the first-stage first heat exchanger and the second-stage first heat exchanger respectively.
Preferably, a high-temperature medium pump is arranged at a high-temperature outlet of the high-temperature heat storage tank, and a low-temperature medium pump is arranged at a low-temperature outlet of the low-temperature heat storage tank.
preferably, the low-temperature storage tank and the high-temperature storage tank are further arranged, the low-temperature outlets of the first-stage third heat exchanger and the second-stage third heat exchanger are connected with the low-temperature storage tank, the outlet of the low-temperature storage tank is connected with the low-temperature inlet of the fourth heat exchanger, the high-temperature outlet of the fourth heat exchanger is connected with the inlet of the high-temperature storage tank, and the outlet of the high-temperature storage tank is connected with the high-temperature inlets of the first-stage third heat exchanger and the second-stage third heat exchanger respectively.
Preferably, the high temperature inlet of the fourth heat exchanger is connected with a main steam pipeline or a reheat steam system pipeline of the boiler, and the low temperature outlet is connected with a deaerator or a condenser.
preferably, a low-temperature molten salt pump is arranged at the outlet of the low-temperature storage tank, and a high-temperature molten salt pump is arranged at the outlet of the high-temperature storage tank.
Preferably, the low-temperature storage tank and the high-temperature storage tank are both heat conduction oil storage tanks or molten salt storage tanks.
Preferably, the exhaust ports of the secondary air turbine are connected to the primary fan inlet and the secondary fan inlet, respectively.
Compared with the prior art, the invention has the following beneficial technical effects:
1. The technical scheme of the invention introduces a compressed air energy storage technology on the basis of deeply understanding the current deep peak shaving technical route, proposes the idea of decoupling energy flows of the boiler and the motor, achieves the aim of reducing carbon and emission in the process of realizing deep peak shaving, ensures safe, stable and economic operation of a unit, and is a deep peak shaving technical scheme in the true sense of a coal motor unit.
2. according to the invention, a mechanical furnace energy flow decoupling scheme is adopted, steam is preferably extracted from a hot section of a reheat steam system, high flow is maintained on the working medium side of the boiler, and the combustion problem, the hydrodynamic problem and the heating surface safety problem of the boiler under deep peak regulation are substantially solved.
3. The existing compressed air energy storage and turbine inlet temperature is limited by the exhaust temperature of the compressor, so that the system efficiency is further improved and limited, and the method is different from the existing compressed air energy storage.
4. the secondary air turbine outlet is connected with the primary air fan inlet and the secondary air fan inlet of the coal-fired power plant, heat and working media of exhaust gas of the final-stage air turbine are recovered, and especially in severe cold areas, the air temperature is improved, and the primary air fan and the air feeder are protected.
5. the boiler, the coal-fired power generation subsystem and the compressed air energy storage system can independently or jointly carry out peak regulation and frequency modulation, and the requirements of quick response of power grid depth peak regulation and frequency modulation and load demand are met.
6. According to the compressed air energy storage subsystem, water, heat conducting oil, molten salt and the like can be selected as heat storage media according to the thermodynamic parameters of the system, so that the compressed heat is fully recovered and utilized, and the working efficiency of the system is improved.
Drawings
Fig. 1 is a schematic diagram of the system architecture of the present invention.
In fig. 1:1 primary air compressor, 2 secondary air compressor, 3 primary first heat exchanger, 4 secondary first heat exchanger, 5 low temperature heat storage tank, 6 high temperature heat storage tank, 7 low temperature medium pump, 8 gas storage, 9 high temperature medium pump, 10 primary second heat exchanger, 11 primary third heat exchanger, 12 primary air turbine, 13 secondary second heat exchanger, 14 secondary third heat exchanger, 15 secondary air turbine, 16 generator, 17 primary fan, 18 secondary fan, 19 low temperature storage tank, 20 low temperature molten salt pump, 21 fourth heat exchanger, 22 high temperature storage tank, 23 high temperature molten salt pump.
Detailed Description
the invention will be described in detail below with reference to the drawings and examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention.
as shown in fig. 1, the coal-fired power plant deep peak shaving power generation system based on compressed air energy storage comprises a compressed air energy storage unit, a compressed air energy release unit and a high-temperature molten salt heat supplementing unit.
The compressed air energy storage unit comprises an air compressor and a first heat exchanger connected with the air compressor, a high-pressure gas outlet of the first heat exchanger is connected with a gas storage 8, and a high-temperature medium outlet of the first heat exchanger is connected with a high-temperature heat storage tank 6; the compressed air energy release unit comprises a second heat exchanger connected with an air outlet of the air storage 8, an air turbine is arranged at the outlet of the second heat exchanger, the air turbine is driven to be connected with a generator 16, and a high-temperature medium inlet and a low-temperature medium outlet of the second heat exchanger are respectively connected with the high-temperature heat storage tank 6 and a low-temperature heat storage tank 5; the high-temperature molten salt heat supplementing unit comprises a third heat exchanger arranged between the second heat exchanger and the air turbine, and a high-temperature inlet of the third heat exchanger is connected with a fourth heat exchanger 21 so as to introduce an external heat source, so that the air temperature of the inlet of the turbine is further improved, and further, the higher air turbine output and the higher power generation efficiency are achieved.
The air compressor at least comprises a first-stage air compressor 1 and a second-stage air compressor 2, the first heat exchanger at least comprises a first-stage first heat exchanger 3 and a second-stage first heat exchanger 4, wherein an air inlet of the first-stage air compressor 1 is communicated with outside air, an air outlet of the first-stage air compressor 1 is connected with the first-stage first heat exchanger 3, an air outlet of the first-stage first heat exchanger 3 is connected with the second-stage air compressor 2, an air outlet of the second-stage air compressor 2 is connected with the second-stage first heat exchanger 4, and an air outlet of the second-stage first heat exchanger 4 is communicated with an air reservoir 8; and the high-temperature medium outlets of the first-stage first heat exchanger 3 and the second-stage first heat exchanger 4 are connected with the high-temperature heat storage tank 6, and the recovered heat is stored in the high-temperature heat storage tank 6 through the heat storage medium.
The second heat exchanger at least comprises a first-stage second heat exchanger 10 and a second-stage second heat exchanger 13, the air turbine at least comprises a first-stage air turbine 12 and a second-stage air turbine 15, and the third heat exchanger at least comprises a first-stage third heat exchanger 11 and a second-stage third heat exchanger 14; the air inlet of the first-stage second heat exchanger 10 is communicated with the air storage 8, the air outlet of the first-stage second heat exchanger 10 is connected with the air inlet of the first-stage air turbine 12 through the first-stage third heat exchanger 11, the air outlet of the first-stage air turbine 12 is connected with the air inlet of the second-stage second heat exchanger 13, the air outlet of the second-stage second heat exchanger 13 is connected with the air inlet of the second-stage air turbine 15 through the second-stage third heat exchanger 14, and the second-stage air turbine 15 drives and is connected with the generator 16.
The high temperature outlet of the high temperature heat storage tank 6 is connected with the high temperature inlets of the first-stage second heat exchanger 10 and the second-stage second heat exchanger 13 respectively, the low temperature outlets of the first-stage second heat exchanger 10 and the second-stage second heat exchanger 13 are connected with the low temperature inlet of the low temperature heat storage tank 5 respectively, and the low temperature outlet of the low temperature heat storage tank 5 is connected with the low temperature inlets of the first-stage first heat exchanger 3 and the second-stage first heat exchanger 4 respectively.
A high-temperature medium pump 9 is arranged at the high-temperature outlet of the high-temperature heat storage tank 6, and a low-temperature medium pump 7 is arranged at the low-temperature outlet of the low-temperature heat storage tank 5.
And a low-temperature storage tank 19 and a high-temperature storage tank 22 are further arranged in the high-temperature molten salt heat supplementing unit, low-temperature outlets of the first-stage third heat exchanger 11 and the second-stage third heat exchanger 14 are connected with the low-temperature storage tank 19, an outlet of the low-temperature storage tank 19 is connected with a low-temperature inlet of the fourth heat exchanger 21, a high-temperature outlet of the fourth heat exchanger 21 is connected with an inlet of the high-temperature storage tank 22, and outlets of the high-temperature storage tank 22 are respectively connected with high-temperature inlets of the first-stage third heat exchanger 11 and the second-stage third heat exchanger 14.
preferably, the high temperature inlet of the fourth heat exchanger 21 is connected with a main steam pipeline or a reheat steam system pipeline of the boiler, and the low temperature outlet is connected with a deaerator or a condenser.
And a low-temperature molten salt pump 20 is provided at the outlet of the low-temperature tank 19, and a high-temperature molten salt pump 23 is provided at the outlet of the high-temperature tank 22.
preferably, the heat exchange medium of the fourth heat exchanger 21 may be heat transfer oil or molten salt, that is, the low-temperature storage tank 19 and the high-temperature storage tank 22 are both heat transfer oil storage tanks or molten salt storage tanks.
And as shown in fig. 1, the exhaust port of the secondary air turbine 15 is respectively connected with the inlet of the primary fan 17 and the inlet of the secondary fan 18, and the heat and working medium of the exhaust of the final air turbine are recovered.
Further, the connection of the above units is achieved by pipes. The specific operation method is as follows:
The machine furnace energy flow decoupling has the following two schemes.
scheme one: and extracting steam (before the main valve) from the main steam pipeline and leading the steam out to an energy storage system. The steam is extracted from the main steam system to realize a possible flow decoupling scheme, but the working medium flow of the reheat steam system of the boiler is reduced, the reheat steam heating surface faces the problem of local overtemperature under low load, and the heating surface safety problem of the boiler under deep peak shaving is not thoroughly solved.
Scheme II: extracting steam from a hot section pipeline (namely the position of an outlet of a high-temperature reheater in front of a reheating valve) of the reheating steam system and leading the steam out to an energy storage system. By adopting the scheme, the working medium side of the boiler keeps high flow, and the combustion problem, the hydrodynamic problem and the heating surface safety problem of the boiler under deep peak shaving are substantially solved. For the steam turbine, the high-pressure cylinder has large through flow, the middle-pressure cylinder and the low-pressure cylinder have obvious through flow reduction, the through flow deviation of the two cylinders is increased, and the problems of bearing thrust and the like are required to be checked in a steam turbine plant. Therefore, the scheme II is preferably adopted to realize the energy flow decoupling of the machine furnace.
When the unit is in deep peak regulation operation, the decoupling load point of the unit is assumed to be 25% BMCR, the boiler is maintained to operate at 25% BMCR load, the steam turbine is operated at 20% THA load, redundant steam (energy) produced by the boiler is extracted from a hot section pipeline of the reheat steam system and led out to the energy storage system, at the moment, the heat storage system is a heat storage process, and the high-temperature molten salt storage tank 22 is used for storing heat of the extracted steam. The water vapor after heat exchange can return to the deaerator or the condenser.
The compression process comprises the following steps: the primary air compressor 1 and the secondary air compressor 2 are driven by using off-peak electricity, wind power discarding, photoelectric discarding and the like, and the ambient atmosphere is compressed to high pressure and stored in the air storage 8, so that the storage of high-pressure gas is completed. Meanwhile, compression heat generated in the compression process is collected through the primary first heat exchanger 3 and the secondary first heat exchanger 4 and stored in the high-temperature heat storage tank 6. Through the compression process, the storage of electric energy is realized, and the electric energy is converted into the intramolecular potential energy of high-pressure air and the heat energy in the heat storage medium.
the expansion power generation process comprises the following steps: when the electric quantity is short or electricity is needed, high-pressure air is released from the air storage 8, is heated by the first-stage second heat exchanger 10, and enters the first-stage third heat exchanger 11, namely the air-molten salt heat exchanger, to be expanded and do work by the first-stage air turbine 12. The air after doing work is discharged from the first-stage air turbine 12, is heated by the second-stage second heat exchanger 13, enters the second-stage third heat exchanger 14, and enters the second-stage air turbine 15 to do expansion work to drive the generator 16 to generate electricity. Finally, the exhaust gas of the secondary air turbine 15 enters the inlet of the primary fan 17 and the inlet of the secondary fan 18 of the coal-fired power plant to complete the expansion power generation process.
the detailed design is related to the running mode of the unit, and is generally determined in an engineering mode according to the optimization of the running mode.
The following are to be noted:
1. The compression process of the embodiment adopts two-stage compression, the expansion process adopts two-stage expansion, the number of stages is small, and the method can be used for multi-stage compression and multi-stage expansion processes.
2. The number of the high-temperature heat storage tanks 6 and the low-temperature heat storage tanks 5 and the heat storage medium are determined according to the actual engineering scheme.
3. the invention recovers the compression heat generated in the compression process, and introduces an external heat source on the basis; the introduction of an external heat source is considered at the inlet end temperature of the lift air turbine.
4. The invention recovers the heat and working medium of the final stage air turbine exhaust, and particularly for severe cold areas, the air temperature is raised, and the primary fan 17 and the secondary fan 18 are protected.
5. According to the invention, a mechanical furnace energy flow decoupling scheme is adopted, steam is preferably extracted from a hot section of a reheat steam system, high flow is maintained on the working medium side of the boiler, and the combustion problem, the hydrodynamic problem and the heating surface safety problem of the boiler under deep peak regulation are substantially solved; by arranging the energy storage system, the energy recycling rate is improved; the carbon reduction and emission reduction in the deep peak shaving process are realized, and the safe, stable and economic operation of the unit is ensured.
Claims (10)
1. the coal-fired power plant deep peak shaving power generation system based on compressed air energy storage is characterized by comprising a compressed air energy storage unit, a compressed air energy release unit and a high-temperature molten salt heat supplementing unit;
the compressed air energy storage unit comprises an air compressor and a first heat exchanger connected with the air compressor, a high-pressure gas outlet of the first heat exchanger is connected with a gas storage (8), and a high-temperature medium outlet of the first heat exchanger is connected with a high-temperature heat storage tank (6);
The compressed air energy release unit comprises a second heat exchanger connected with an air outlet of the air storage (8), an air turbine is arranged at the outlet of the second heat exchanger, the air turbine is driven to be connected with a generator (16), and a high-temperature medium inlet and a low-temperature medium outlet of the second heat exchanger are respectively connected with the high-temperature heat storage tank (6) and a low-temperature heat storage tank (5);
The high-temperature molten salt heat supplementing unit comprises a third heat exchanger arranged between the second heat exchanger and the air turbine, and a high-temperature inlet of the third heat exchanger is connected with a fourth heat exchanger (21).
2. the coal-fired power plant depth peaking generation system based on compressed air energy storage according to claim 1, wherein the air compressor at least comprises a primary air compressor (1) and a secondary air compressor (2), the first heat exchanger at least comprises a primary first heat exchanger (3) and a secondary first heat exchanger (4), wherein an air inlet of the primary air compressor (1) is communicated with outside air, an air outlet of the primary air compressor (1) is connected with the primary first heat exchanger (3), an air outlet of the primary first heat exchanger (3) is connected with the secondary air compressor (2), an air outlet of the secondary air compressor (2) is connected with the secondary first heat exchanger (4), and an air outlet of the secondary first heat exchanger (4) is communicated with an air reservoir (8); and the high-temperature medium outlets of the first-stage first heat exchanger (3) and the second-stage first heat exchanger (4) are connected with the high-temperature heat storage tank (6).
3. The compressed air energy storage-based coal-fired power plant depth peaking generation system according to claim 2, wherein the second heat exchanger at least comprises a primary second heat exchanger (10) and a secondary second heat exchanger (13), the air turbine at least comprises a primary air turbine (12) and a secondary air turbine (15), and the third heat exchanger at least comprises a primary third heat exchanger (11) and a secondary third heat exchanger (14); the air inlet of the first-stage second heat exchanger (10) is communicated with the air storage (8), the air outlet of the first-stage second heat exchanger (10) is connected with the air inlet of the first-stage air turbine (12) through the first-stage third heat exchanger (11), the air outlet of the first-stage air turbine (12) is connected with the air inlet of the second-stage second heat exchanger (13), the air outlet of the second-stage second heat exchanger (13) is connected with the air inlet of the second-stage air turbine (15) through the second-stage third heat exchanger (14), and the second-stage air turbine (15) drives and is connected with the generator (16).
4. A compressed air energy storage based coal-fired power plant depth peaking generation system according to claim 3, characterized in that the high temperature outlets of the high temperature heat storage tank (6) are respectively connected with the high temperature inlets of the primary second heat exchanger (10) and the secondary second heat exchanger (13), the low temperature outlets of the primary second heat exchanger (10) and the secondary second heat exchanger (13) are respectively connected with the low temperature inlet of the low temperature heat storage tank (5), and the low temperature outlets of the low temperature heat storage tank (5) are respectively connected with the low temperature inlets of the primary first heat exchanger (3) and the secondary first heat exchanger (4).
5. The compressed air energy storage-based coal-fired power plant deep peak shaving power generation system according to claim 4, wherein a high-temperature medium pump (9) is arranged at a high-temperature outlet of the high-temperature heat storage tank (6), and a low-temperature medium pump (7) is arranged at a low-temperature outlet of the low-temperature heat storage tank (5).
6. The compressed air energy storage-based coal-fired power plant deep peak shaving power generation system according to claim 4, further comprising a low-temperature storage tank (19) and a high-temperature storage tank (22), wherein low-temperature outlets of the first-stage third heat exchanger (11) and the second-stage third heat exchanger (14) are connected with the low-temperature storage tank (19), an outlet of the low-temperature storage tank (19) is connected with a low-temperature inlet of the fourth heat exchanger (21), a high-temperature outlet of the fourth heat exchanger (21) is connected with an inlet of the high-temperature storage tank (22), and outlets of the high-temperature storage tank (22) are respectively connected with high-temperature inlets of the first-stage third heat exchanger (11) and the second-stage third heat exchanger (14).
7. The compressed air energy storage-based coal-fired power plant deep peak shaving power generation system according to claim 6, wherein the high-temperature inlet of the fourth heat exchanger (21) is connected with a main steam pipeline or a reheat steam system pipeline of the boiler, and the low-temperature outlet is connected with a deaerator or a condenser.
8. The compressed air energy storage-based coal-fired power plant deep peak shaving power generation system according to claim 6, wherein a low-temperature molten salt pump (20) is arranged at the outlet of the low-temperature storage tank (19), and a high-temperature molten salt pump (23) is arranged at the outlet of the high-temperature storage tank (22).
9. The compressed air energy storage-based coal-fired power plant deep peak shaving power generation system according to claim 6, wherein the low-temperature storage tank (19) and the high-temperature storage tank (22) are both heat conducting oil storage tanks or are both molten salt storage tanks.
10. the compressed air energy storage-based coal-fired power plant depth peak shaving power generation system according to claim 6, wherein the exhaust port of the secondary air turbine (15) is connected with the inlet of the primary fan (17) and the inlet of the secondary fan (18) respectively.
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| CN202311667599.XA CN117759360A (en) | 2023-12-06 | 2023-12-06 | Coal-fired power plant depth peak shaving power generation system based on compressed air energy storage |
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