CN221074569U - CAES system shared by modularized configuration heat exchange systems - Google Patents
CAES system shared by modularized configuration heat exchange systems Download PDFInfo
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- 238000005338 heat storage Methods 0.000 claims abstract description 54
- 238000003860 storage Methods 0.000 claims abstract description 53
- 238000002955 isolation Methods 0.000 claims description 41
- 238000004146 energy storage Methods 0.000 abstract description 39
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 238000010248 power generation Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a CAES system shared by modularized configuration heat exchange systems, and relates to the technical field of compressed air energy storage power stations. The device comprises a heat exchanger module, an air compressor, an air turbine, a gas storage, a low-temperature storage tank and a high-temperature storage tank, wherein an air compressor outlet and an air turbine inlet are connected with a high-temperature compressed air main pipe at the high temperature side of the heat exchanger module; the inlet of the gas storage is connected with a low-temperature compressed air main pipe at the low-temperature side of the heat exchanger module; the low-temperature storage tank is connected with a low-temperature heat storage medium main pipe at the low-temperature side of the heat exchanger module; the high-temperature storage tank is connected with a high-temperature heat storage medium main pipe at the high temperature side of the heat exchanger module. The compression side and expansion side heat exchange systems are shared, so that the problems of large number of heat exchanger equipment, large occupied area and high investment can be solved.
Description
Technical Field
The utility model relates to the technical field of compressed air energy storage power stations, in particular to a CAES system shared by modularized configuration heat exchange systems.
Background
The energy storage is one of key technologies for supporting the large-scale development of new energy and ensuring the energy safety in China, and has the functions of improving the new energy consumption proportion, ensuring the safe and stable operation of a power system, improving the utilization rate of power generation, transmission and distribution facilities, promoting multi-network fusion and the like; meanwhile, energy storage is one of key technologies for changing random fluctuation energy into friendly energy; the energy storage technology is applied, so that the bottleneck that the transmission, transformation and distribution of the original power system are required to be balanced in real time can be broken.
The non-afterburning compressed air energy storage system has the advantages of large scale, quick response, high efficiency, low cost, environmental protection and the like, can realize energy storage services such as power peak regulation, frequency modulation, phase modulation, rotary standby, emergency response and the like, and improves the efficiency, stability and safety of the power system. The whole system mainly comprises a compression energy storage system, an expansion power generation system, a heat exchange system, a heat storage system and a gas storage system, and the operation is divided into an energy storage process and an energy release process; the energy storage process is to convert electric energy into air internal energy through an air compressor during the low load period of the power grid, cool high-temperature and high-pressure air through a heat exchanger and store the air in a salt cavern, a cave, a mine, a pressure container or other gas storages; the energy release process is to release high-pressure air in the air storage during the peak load period of the power grid, and then to drive the air turbine to generate electricity after the high-pressure air is heated by the heat exchanger.
The heat exchanger is used as a tool for heat exchange in the energy storage and release processes, is core equipment for realizing heat balance of a non-afterburning compressed air energy storage system, and the design of the heat exchanger directly influences the configuration and efficiency of the system; in addition, the heat exchangers are respectively arranged on the compression side and the turbine side of the conventional compressed air energy storage power station, so that the number of the heat exchangers is large, the occupied area is wide, and the cost is high.
The compressed air energy storage power station has the main functions of peak clipping and valley filling and promoting the consumption of new energy, so that the number of operating hours in one period is determined by the peak-valley characteristics of a local power grid, and the general energy storage duration and the energy release duration are not consistent; the compressed air energy storage power station which is put into operation or under construction in China at present has energy storage time longer than energy release time; taking energy storage for 8 hours and energy release for 5 hours as an example, as the total amount of air injected into the air storage in one period is equal to the total amount of air extracted, the air flow in the energy release stage is 1.6 times of the air injection flow in the energy storage stage; at this time, if the heat exchange loops of the compression side and the expansion side are completely shared, the great difference of the air flow in the loops in the energy storage and release stages can cause the air flow velocity in the heat exchanger to be too fast or too slow relative to the design flow velocity, if the flow velocity is too slow, the heat exchange coefficient can be reduced, the heat exchange end difference is increased, and the heat energy utilization rate is reduced, so that the efficiency of the whole system is reduced; if the flow rate is too fast, the gas side pressure loss is increased, the efficiency of the whole system is reduced, and meanwhile, the flow rate is too fast, the vibration of the tube bundles in the heat exchanger is also caused, and the safe and stable operation of the heat exchanger is influenced.
Patent CN113027734A proposes a compressed air energy storage system and a method based on a heat storage and release shared loop, and the problem of overhigh investment cost of two loops in a conventional system is overcome through the shared loop;
The patent CN105370408A proposes a novel heat accumulating type compressed air energy storage system, and the problems of repeated arrangement, more occupied area, high cost and the like of the heat accumulating type compressed air energy storage system are solved by sharing a heat exchanger by a compressor unit and an expansion unit.
However, the two patents are all complete and shared heat exchange loops, and are suitable for scenes with little difference of compressed air flow in energy storage and energy release stages, otherwise, the air flow rate in the heat exchanger deviates from the design working condition to cause poor heat exchange effect, and even the safe and stable operation of the heat exchanger is influenced.
Therefore, it is necessary to develop a CAES system that is common to modular heat exchange systems.
Disclosure of Invention
The present utility model is directed to overcoming the above-mentioned shortcomings of the prior art and providing a CAES system common to modular heat exchange systems.
In order to achieve the above purpose, the technical scheme of the utility model is as follows: a CAES system common to modular heat exchange systems, characterized by: the high-temperature compressed air storage device comprises a heat exchanger module, an air compressor, an air turbine, a gas storage, a low-temperature storage tank and a high-temperature storage tank, wherein an outlet of the air compressor and an inlet of the air turbine are connected with a high-temperature compressed air main pipe at a high-temperature side of the heat exchanger module; the inlet of the gas storage is connected with a low-temperature compressed air main pipe at the low-temperature side of the heat exchanger module;
The low-temperature storage tank is connected with a low-temperature heat storage medium main pipe at the low-temperature side of the heat exchanger module; the high-temperature storage tank is connected with a high-temperature heat storage medium main pipe at the high-temperature side of the heat exchanger module.
In the above technical scheme, the air compressor outlet is provided with a first isolation valve, the air turbine inlet is provided with a second isolation valve, and the air storage inlet is provided with a third isolation valve.
In the above technical scheme, the low-temperature storage tank is connected with the low-temperature heat storage medium main pipe through the first pump group, and the high-temperature storage tank is connected with the high-temperature heat storage medium main pipe through the second pump group.
In the above technical scheme, a first bypass valve is arranged on the first pump set, and a second bypass valve is arranged on the second pump set.
In the above technical scheme, the heat exchanger module comprises a standby heat exchanger module, an M heat exchanger module and an N heat exchanger module, wherein the number of heat exchangers of the standby heat exchanger module is 1, the number of heat exchangers of the M heat exchanger module is M, and the number of heat exchangers of the N heat exchanger module is N.
In the above technical scheme, the standby heat exchanger module, the M heat exchanger module and the N heat exchanger module are provided with a first air interface, a second air interface, a first heat storage medium interface and a second heat storage medium interface; the first air interface and the second heat storage medium interface are positioned on the high-temperature side of the heat exchanger module, the second air interface and the first heat storage medium interface are positioned on the low-temperature side of the heat exchanger module, the first air interface is connected with the high-temperature compressed air main pipe through the fourth isolation valve, the second air interface is connected with the low-temperature compressed air main pipe through the fifth isolation valve, the first heat storage medium interface is connected with the low-temperature heat storage medium main pipe through the sixth isolation valve, and the second heat storage medium interface is connected with the high-temperature heat storage medium main pipe through the seventh isolation valve.
Compared with the prior art, the utility model has the following advantages:
1) The compression side and expansion side heat exchange systems are shared, so that the problems of large number of heat exchanger equipment, large occupied area and high investment can be solved.
2) According to the utility model, through the modularized design of the heat exchanger, the equipment utilization rate is improved, the type of the heat exchanger is reduced, and the manufacturing cost is reduced.
3) According to the utility model, through flexible configuration of the heat exchanger module in the energy storage and power generation stage, the local energy storage and power generation time length of the power station is matched, and the problems that the heat exchanger deviates from the design working condition when the energy storage and power generation time length is inconsistent, the safe and stable operation of the power station is influenced, and the electric conversion efficiency of the whole plant is reduced are solved; the heat exchanger is safer, more stable and more economical to operate.
4) The utility model solves the problem that the power station needs to be stopped when the heat exchange system is overhauled by configuring the standby heat exchanger module, ensures the continuous production of the power station and improves the operation reliability of the power station.
5) According to the utility model, through making a annual operation plan of the heat exchangers, the annual operation hours of all the heat exchangers are basically the same, the service life of the heat exchangers is prolonged, and the problem of inconsistent service lives of the heat exchangers caused by different operation hours of the heat exchangers of the conventional heat exchange system is solved.
Drawings
FIG. 1 is a schematic diagram of a gas storage side structure of the present utility model.
Fig. 2 is a schematic view of a heat storage side structure of the present utility model.
Detailed Description
The following detailed description of the utility model is, therefore, not to be taken in a limiting sense, but is made merely by way of example. While making the advantages of the present utility model clearer and more readily understood by way of illustration.
As can be seen with reference to the accompanying drawings: a CAES system common to modular heat exchange systems, characterized by: the high-temperature compressed air storage device comprises a heat exchanger module 1, an air compressor 2, an air turbine 3, an air storage 4, a low-temperature storage tank 5 and a high-temperature storage tank 6, wherein an outlet of the air compressor 2 and an inlet of the air turbine 3 are connected with a high-temperature compressed air main pipe 11 at a high temperature side of the heat exchanger module 1; the inlet of the gas storage 4 is connected with a low-temperature compressed air main pipe 12 at the low-temperature side of the heat exchanger module 1;
The low-temperature storage tank 5 is connected with a low-temperature heat storage medium main pipe 13 at the low-temperature side of the heat exchanger module 1; the high-temperature storage tank 6 is connected with a high-temperature heat storage medium main pipe 14 at the high-temperature side of the heat exchanger module 1. The heat exchanger module 1 refers to a shell-and-tube type, a hairpin type, a fin tube type, a winding tube type, a header tube type heat exchanger and the like or a combination thereof; the heat storage medium refers to water, heat conducting oil, molten salt and the like; the gas storage 4 refers to salt caves, artificial chambers, pipeline steel, mine caverns, pressure containers and the like; the high-temperature tank 6 and the low-temperature tank 5 refer to a spherical tank, a C-type tank, a cylindrical tank, and the like.
The outlet of the air compressor 2 is provided with a first isolation valve 21, the inlet of the air turbine 3 is provided with a second isolation valve 31, and the inlet of the air storage 4 is provided with a third isolation valve 41.
The low-temperature storage tank 5 is connected with the low-temperature heat storage medium main pipe 13 through the first pump group 51, and the high-temperature storage tank 6 is connected with the high-temperature heat storage medium main pipe 14 through the second pump group 61.
The first pump unit 51 is provided with a first bypass valve 52, and the second pump unit 61 is provided with a second bypass valve 62.
The heat exchanger module 1 comprises a standby heat exchanger module 15, M heat exchanger modules 16 and N heat exchanger modules 17, wherein the number of heat exchangers of the standby heat exchanger module 15 is 1 or 2, the number of heat exchangers of the M heat exchanger modules 16 is M, and the number of heat exchangers of the N heat exchanger modules 17 is N.
The standby heat exchanger module 15, the M heat exchanger module 16 and the N heat exchanger module 17 are respectively provided with a first air interface 181, a second air interface 182, a first heat storage medium interface 183 and a second heat storage medium interface 184; the first air interface 181 and the second heat storage medium interface 184 are located on the high temperature side of the heat exchanger module 1, the second air interface 182 and the first heat storage medium interface 183 are located on the low temperature side of the heat exchanger module 1, the first air interface 181 is connected with the high temperature compressed air main 11 through the fourth isolation valve 191, the second air interface 182 is connected with the low temperature compressed air main 12 through the fifth isolation valve 192, the first heat storage medium interface 183 is connected with the low temperature heat storage medium main 13 through the sixth isolation valve 193, and the second heat storage medium interface 184 is connected with the high temperature heat storage medium main 14 through the seventh isolation valve 194.
Fig. 1-2 illustrate single stage compression and single stage expansion, where multiple stage compression and multiple stage expansion are employed, the heat exchanger module may be shared after each stage of compressor (low pressure-high pressure) and before each stage of expander (high pressure-low pressure), and the design pressure of the heat exchanger module may be determined based on the highest operating pressure of this stage.
The heat exchanger is divided into three parts according to a modular design, namely a standby heat exchanger module 15, an M heat exchanger module 16 and an N heat exchanger module 17; the number m+n of the heat exchangers is determined according to the electricity storage and generation duration of the power station; the increase and decrease of the input quantity of the heat exchanger modules 1 are realized by opening or closing the fourth isolation valve 191 and the fifth isolation valve 192, and when a certain heat exchanger module in the system is repaired or maintained, the standby heat exchanger module 15 can be started, so that the production of the power station is not influenced; during actual operation, any heat exchanger can be set as a standby heat exchanger according to the situation; the third isolation valve 41 at the inlet of the reservoir 4 is opened during the energy storage and release phases and closed during the other phases.
The low-temperature storage tank 5 conveys the low-temperature heat storage medium to the low-temperature heat storage medium main pipe 13 of the heat exchanger module 1 through the first pump group 51; the first pump group 51 is provided with a first bypass valve 52, and receives the low-temperature heat storage medium of the low-temperature heat storage medium main pipe 13 of the heat exchanger module 1 through the first bypass valve 52; the high-temperature storage tank 6 conveys the low-temperature heat storage medium to the high-temperature heat storage medium main pipe 14 at the high-temperature side of the heat exchanger module 1 through the second pump group 61, and receives the high-temperature heat exchange medium of the high-temperature heat storage medium main pipe 14 at the high-temperature side of the heat exchanger module 1 through the second bypass valve 62; the increase or decrease of the number of heat exchangers to be put in is achieved by opening or closing the sixth isolation valve 193 and the seventh isolation valve 194, and the number of heat exchangers to be put in is kept consistent with the operation of the air side heat exchanger.
The application method of the CAES system shared by the modularized configuration heat exchange systems comprises the following steps:
Step 1: in the energy storage stage of the air side, the M heat exchanger modules 16 are put into use, the second isolation valve 31 is closed, the air compressor 2 and the first isolation valve 21 are opened, after the outlet pressure of the air compressor 2 reaches the gas injection pressure, the third isolation valve 41 is opened to inject gas into the gas storage 4, at the moment, the number of the M heat exchangers to be put into use is M, and the standby heat exchanger modules 15 and the N heat exchanger modules 17 are closed;
Step 2: in the energy release stage of the air side, the second isolation valve 31 and the third isolation valve 41 are opened, the first isolation valve 21 is closed, the fourth isolation valve 191 and the fifth isolation valve 192 of the inlet and outlet of the M heat exchanger module 16 and the N heat exchanger module 17 are opened, high-pressure air is heated by the heat exchanger module 1 and then is subjected to turbine power generation by flushing, at the moment, m+n heat exchangers participate in heat exchange, and the fourth isolation valve 191 and the fifth isolation valve 192 of the standby heat exchanger module 15 are closed;
Step 3: in the energy storage stage, the heat exchange medium side closes the first bypass valve 52, opens the second bypass valve 62, conveys the low-temperature heat storage medium from the low-temperature storage tank 5 to the heat exchanger module 1 through the first pump group 51 to absorb compression heat, and flows into the high-temperature storage tank 6 after heating;
Step 4: the heat exchange medium side is in the power generation stage, the first bypass valve 52 is opened, the second bypass valve 62 is closed, and the high-temperature heat storage medium is conveyed from the high-temperature storage tank 6 to the heat exchanger through the second pump set 61, released from heat and cooled and flows into the low-temperature storage tank 5; the sixth isolation valve 193 and the seventh isolation valve 194 of the first heat storage medium port 183 and the second heat storage medium port 184 are kept in agreement with the fourth isolation valve 192 and the fifth isolation valve 193 of the first air port 181 and the second air port 182 in switching state.
According to the characteristics of compressed air energy storage and the current situation of peak-valley characteristics of the domestic power grid, in one energy storage and release period, the general energy storage time is not less than the energy release time, so that the air flow during energy release is not less than the air flow during energy storage; the number of the heat exchanger modules 1 can be designed according to the space-time energy release, and the effect of matching the air quantity with the number of the heat exchangers is achieved by cutting part of the heat exchanger modules 1 when energy is stored; in addition, in the energy storage stage, the number of the input heat exchanger modules is m, the rest n+1 (or 2) heat exchanger modules can be used as standby heat exchangers 13, and the on-line switching is realized through the on-off of the inlet and outlet isolation valves of the heat exchangers, so that the reliability of a heat exchange system in the energy storage stage can be remarkably improved; in actual operation, the m heat exchanger modules can be periodically switched according to the annual plan, so that the annual operation hours of each heat exchanger are ensured to be basically equivalent, and the service life of the heat exchanger is prolonged.
Taking the electricity storage and generation time length of a certain compressed air energy storage power station put into production in China as an example, the energy storage time length is 8 hours, and the electricity generation time length is 5 hours; at this time, m=5, and m+n=8 may be set. In the energy storage stage, 5 groups of heat exchanger modules are put into and run for 8 hours; in the power generation stage, 8 groups of heat exchanger modules are put into operation for 5 hours. Therefore, the flow rates of the air and the heat storage medium can be perfectly matched, the heat exchanger module is ensured to operate under the optimal working condition, and the operation stability and the operation efficiency of the equipment are improved. At this time, the flow rate of the first pump group 51 of the cryogenic storage tank 5 is lower than that of the second pump group 61 of the cryogenic storage tank 6, and the flow rate ratio of the two pump groups is 5:8.
Other non-illustrated parts are known in the art.
Claims (6)
1. A CAES system common to modular heat exchange systems, characterized by: the high-temperature compressed air storage device comprises a heat exchanger module (1), an air compressor (2), an air turbine (3), a gas storage (4), a low-temperature storage tank (5) and a high-temperature storage tank (6), wherein an outlet of the air compressor (2) and an inlet of the air turbine (3) are connected with a high-temperature compressed air main pipe (11) at a high-temperature side of the heat exchanger module (1); the inlet of the gas storage (4) is connected with a low-temperature compressed air main pipe (12) at the low-temperature side of the heat exchanger module (1);
The low-temperature storage tank (5) is connected with a low-temperature heat storage medium main pipe (13) at the low-temperature side of the heat exchanger module (1); the high-temperature storage tank (6) is connected with a high-temperature heat storage medium main pipe (14) at the high-temperature side of the heat exchanger module (1).
2. A CAES system common to modular configuration heat exchange systems according to claim 1 wherein: the air compressor (2) outlet is provided with a first isolation valve (21), the air turbine (3) inlet is provided with a second isolation valve (31), and the air storage (4) inlet is provided with a third isolation valve (41).
3. A CAES system common to modular configuration heat exchange systems according to claim 2 wherein: the low-temperature storage tank (5) is connected with the low-temperature heat storage medium main pipe (13) through a first pump group (51), and the high-temperature storage tank (6) is connected with the high-temperature heat storage medium main pipe (14) through a second pump group (61).
4. A CAES system common to a modular configuration heat exchange system according to claim 3 wherein: the first pump set (51) is provided with a first bypass valve (52), and the second pump set (61) is provided with a second bypass valve (62).
5. A CAES system common to modular configuration heat exchange systems as described in claim 4 wherein: the heat exchanger module (1) comprises a standby heat exchanger module (15), M heat exchanger modules (16) and N heat exchanger modules (17), the number of heat exchangers of the standby heat exchanger module (15) is 1, the number of heat exchangers of the M heat exchanger modules (16) is M, and the number of heat exchangers of the N heat exchanger modules (17) is N.
6. A CAES system common to modular configuration heat exchange systems as described in claim 5 wherein: the standby heat exchanger module (15), the M heat exchanger module (16) and the N heat exchanger module (17) are respectively provided with a first air interface (181), a second air interface (182), a first heat storage medium interface (183) and a second heat storage medium interface (184); the first air interface (181) and the second heat storage medium interface (184) are located on the high-temperature side of the heat exchanger module (1), the second air interface (182) and the first heat storage medium interface (183) are located on the low-temperature side of the heat exchanger module (1), the first air interface (181) is connected with the high-temperature compressed air main pipe (11) through a fourth isolation valve (191), the second air interface (182) is connected with the low-temperature compressed air main pipe (12) through a fifth isolation valve (192), the first heat storage medium interface (183) is connected with the low-temperature heat storage medium main pipe (13) through a sixth isolation valve (193), and the second heat storage medium interface (184) is connected with the high-temperature heat storage medium main pipe (14) through a seventh isolation valve (194).
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| CN202211379555.2A CN115898829A (en) | 2022-11-04 | 2022-11-04 | CAES system shared by modularly configured heat exchange systems and use method |
| CN2022113795552 | 2022-11-04 |
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| CN217652793U (en) * | 2022-07-26 | 2022-10-25 | 中国能源建设集团江苏省电力设计院有限公司 | Combined type heat storage and exchange system of compressed air energy storage power station |
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