CN216842148U - Compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage - Google Patents
Compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage Download PDFInfo
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- CN216842148U CN216842148U CN202123240965.2U CN202123240965U CN216842148U CN 216842148 U CN216842148 U CN 216842148U CN 202123240965 U CN202123240965 U CN 202123240965U CN 216842148 U CN216842148 U CN 216842148U
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Abstract
The utility model discloses a compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage, which comprises a multistage compressor, a multistage expander, a plurality of heat exchangers, an air storage system and a high-temperature hot water heat storage and release system, wherein the high-temperature hot water heat storage and release system comprises a hot water storage tank, a cold water storage tank and an air supply mechanism, the air supply mechanism is used for providing high-pressure air for the first filling for the cold water storage tank and the hot water storage tank through a gas communicating pipe and maintaining the air pressure in the tanks after the system operates; the cold water storage tank is communicated with the hot water storage tank through at least one group of water delivery systems, each group of water delivery systems comprises a water delivery pipe and a water pump, and the water pump is used for pumping water from the hot water storage tank to the cold water storage tank through the heat exchanger through the water delivery pipe and/or pumping water from the cold water storage tank to the hot water storage tank through the heat exchanger. The utility model discloses a 180 ℃ high temperature hot water carries out the heat-retaining, solves the high problem of heat-retaining system investment, has solved high pressure, high temperature hot water simultaneously and has stored the problem that thermal system maintains pressure.
Description
Technical Field
The utility model relates to a heat-retaining technical field of compressed air energy storage power station, concretely relates to adopt compressed air energy storage system of high pressure high temperature hot water heat accumulation.
Background
With the construction of more and more large-scale new energy bases, the new energy greatly affects the electric energy quality of a power supply transmission end due to the fluctuation of wind and light. Compared with the traditional electrochemical energy storage, the compressed air energy storage has the advantages of high safety, large adjustable capacity, rotational inertia and the like, so that if the compressed air energy storage is constructed in a large-scale new energy base, the compressed air energy storage has positive significance for the delivery of electric energy of the whole energy base, the power grid absorption capacity of new energy can be greatly improved, and the phenomenon that wind and light are abandoned is reduced.
Compressed air energy storage is in a rapid development stage, and most domestic control strategy researches on compressed air energy storage are in a theoretical research stage, so that the control problem of heat accumulating type compressed air energy storage cannot be fully solved in actual operation.
At present, there are two main technical routes for non-afterburning compressed air energy storage power stations, respectively called isothermal compression scheme and adiabatic compression scheme. The isothermal compression scheme adopts 120 ℃ low-pressure hot water for heat storage, and the adiabatic compression scheme adopts 330 ℃ heat conducting oil for heat storage. Along with the increase of the heat storage temperature, the overall efficiency of the power station is improved.
However, as the capacity of the unit increases, if high-temperature heat conduction oil is used for heat storage, the required heat conduction oil capacity is large, and the investment is too high. And the low-temperature hot water at 120 ℃ is adopted for heat storage, so that the overall efficiency of the power station is low.
The high-temperature hot water is adopted for heat storage, so that the investment of a heat storage system can be greatly reduced, and the high efficiency of a compressed air energy storage power station can be kept. High-temperature hot water is adopted for heat storage, in order to ensure that the high-temperature hot water is in a liquid state and avoid overheating, the heat storage tank needs to maintain higher pressure, if a pressurizing measure is not adopted, the pressure in the hot water tank is reduced along with the reduction of the water level in the hot water tank, and the hot water can boil, so that the system safety is influenced; if the external high-pressure air is used to maintain the pressure in the hot water tank, a large amount of high-pressure air and energy are wasted.
Based on the above situation, the utility model provides an adopt compressed air energy storage system of high pressure high temperature hot water heat accumulation can effectively solve above problem.
SUMMERY OF THE UTILITY MODEL
To the not enough of existence among the prior art, the utility model aims to provide an adopt compressed air energy storage system of high pressure high temperature hot water heat accumulation. The utility model discloses a 180 ℃ high temperature hot water carries out the heat-retaining, solves the high problem of high temperature conduction oil heat-retaining system investment, solves the problem that 120 ℃ low temperature hot water heat-retaining leads to compressed air energy storage power station inefficiency simultaneously. The cold water storage tank and the hot water storage tank are communicated through the gas communicating pipe, so that the problem that a high-pressure and high-temperature hot water storage and heat storage system maintains pressure is solved.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
the utility model provides an adopt compressed air energy storage system of high pressure high temperature hot water heat accumulation, compressed air energy storage system includes multistage compressor, multistage expander, a plurality of heat exchangers and gas storage system of being connected with multistage compressor and multistage expander respectively, still stores the thermal system including the heat that is used for storing compressor compressed air production, the high temperature hot water of required heat when being used for releasing expander inflation air, high temperature hot water stores the thermal system and includes
At least one hot water storage tank for storing high-temperature hot water;
at least one cold water storage tank for storing cold water at a low temperature;
the cold water storage tank and the hot water storage tank are communicated with each other through a gas communicating pipe, the input end of the gas communicating pipe is connected with a gas supply mechanism, the gas supply mechanism is used for supplying high-pressure gas for the first filling to the cold water storage tank and the hot water storage tank through the gas communicating pipe and maintaining the gas pressure in the tanks after the system operates, and the high-pressure gas is preferably nitrogen or can also be high-pressure air;
the at least one cold water storage tank is communicated with the at least one hot water storage tank through at least one group of water delivery systems, each group of water delivery systems comprises a water delivery pipe and a water pump, and the water pump is used for pumping water from the hot water storage tank to the cold water storage tank through a heat exchanger through the water delivery pipe and/or pumping water from the cold water storage tank to the hot water storage tank through the heat exchanger.
Preferably, the volume between the at least one cold water storage tank and the at least one hot water storage tank is the same or the volume of the at least one cold water storage tank is slightly smaller than the volume of the at least one hot water storage tank.
Preferably, the highest pressure bearing value of the at least one cold water storage tank and the at least one hot water storage tank is at least 1.5MPa, and the highest temperature bearing value of the at least one hot water storage tank is at least 180 ℃; the working temperature of the hot water storage tank is 180 ℃, and the pressure of the high-pressure gas is not lower than 1 MPa.
Preferably, the number of the cold water storage tanks and the number of the hot water storage tanks are both set to be multiple, and the multiple cold water storage tanks and the multiple hot water storage tanks are arranged at intervals and are all located on the same horizontal plane.
Preferably, the number of the water delivery systems is two, wherein the water pumps on one water delivery system pump water from the hot water storage tank to the cold water storage tank through the water delivery pipes, and the water pumps on the other water delivery system pump water from the cold water storage tank to the hot water storage tank through the water delivery pipes.
Preferably, the water pump is a one-way water pump or a two-way water pump.
Preferably, valves are respectively arranged on the water delivery pipes close to the cold water storage tank and the hot water storage tank, on the delivery pipe close to the water pump and on the gas communicating pipe close to the gas supply mechanism.
Preferably, the cold water storage tank and the hot water storage tank are both spherical tanks or C-shaped horizontal tanks.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the energy storage efficiency is higher: the rated operation efficiency can reach more than 70 percent, which is 10 to 20 percent higher than that of foreign compressed air energy storage power stations with the same scale. The unit cost is low: the cost of the system after large-scale industrialization can reach 4000-6000 yuan/kW or 1000-1500 yuan/kWh, which is basically equivalent to the unit cost of a pumped storage system and is lower than that of other energy storage technologies. The service life of the system is long: the service life of the system is 30-50 years, and large-scale investment is not required to be newly added. Is friendly to the environment: the energy storage system does not involve the combustion of fossil fuels and does not discharge any harmful substances. The excess heat and cold energy generated by the system operation can realize comprehensive energy supply, and meanwhile, the industrial waste heat can be recycled.
2. Comprehensive consideration investment and power station efficiency, according to the rerum natura of water and steam, the utility model provides an adopt 180 ℃ high temperature hot water to carry out the scheme of heat-retaining, not only can reduce the investment of heat-retaining system by a wide margin (the highest pressure bearing value of hot water storage tank and cold water storage tank reaches more than 1.5 MPa), can keep compressed air energy storage power station to have higher efficiency simultaneously, solve the heat-retaining system investment height and adopt the problem that low temperature hot water heat-retaining leads to compressed air energy storage power station inefficiency, compromise investment and power station efficiency.
3. The utility model discloses a pass through upper portion air conduit intercommunication with hot water storage tank, cold water storage tank, at the system operation initial stage, pour into highly-compressed air into, maintain certain pressure in the messenger system. When the hot water tank delivers water to the cold water tank, high-pressure air is driven to the hot water tank, the hot water tank is also in a high-pressure state, and vice versa. The method avoids the great energy waste caused by maintaining the pressure by adopting external high-pressure air, and solves the problem of maintaining the pressure of a high-pressure and high-temperature hot water heat storage and storage system.
Drawings
Fig. 1 is a schematic structural view of a compressed air energy storage system using high-pressure high-temperature hot water for heat storage according to an embodiment of the present invention.
Fig. 2 is a detailed structural schematic diagram of the high-temperature hot water heat storage and release system in fig. 1.
Fig. 3 is a schematic structural view of a high-temperature hot water heat storage and release system of a compressed air energy storage system according to the second embodiment of the present invention.
Fig. 4 is a schematic structural view of a high-temperature hot water heat storage and release system of a compressed air energy storage system according to a third embodiment of the present invention.
Fig. 5 is a schematic structural view of a compressed air energy storage system according to a third embodiment of the present invention.
Fig. 6 is a schematic structural view of a high-temperature hot water heat storage and release system of the compressed air energy storage system according to the fourth embodiment of the present invention.
Fig. 7 is a schematic structural view of a high-temperature hot water heat storage and release system of a compressed air energy storage system according to a fifth embodiment of the present invention.
Fig. 8 is a schematic structural view of a high-temperature hot water heat storage and release system of a compressed air energy storage system according to a sixth embodiment of the present invention.
Fig. 9 is a graph showing the change of the saturated pressure value of water with the temperature rise according to the embodiment of the present invention.
Reference numerals: 1, an air compressor; 2-an expander; 3-a heat exchanger; 4-a gas storage system; 5-high temperature hot water heat storage and release system; 51-a hot water storage tank; 52-cold water storage tank; 53-gas communication pipe; 54-an air supply mechanism; 55-a water delivery system; 551-water delivery pipe; 552-water pump; 5521-one-way water pump; 5522-a bidirectional water pump; 56-a valve; 6-an air cooler; 7-cooling tower.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following description of the preferred embodiments of the present invention is given with reference to the accompanying examples, but it should be understood that the drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The present invention will be further described with reference to the accompanying fig. 1-9 and examples, but the invention is not limited thereto.
Example one
As shown in fig. 1, the embodiment provides a compressed air energy storage system using high-pressure high-temperature hot water for heat storage, the compressed air energy storage system includes a compressor 1, an expander 2, a heat exchanger 3, an air storage system 4 and a high-temperature hot water heat storage and storage system 5, the utility model discloses a multi-stage compression system and a multi-stage expansion system, that is, the embodiment preferably uses 4 compressors 1 and 3 expanders 2, wherein, the 4 compressors 1 are connected in series in sequence and then connected with the inlet of the air storage system 4, and the outlet of each compressor 1 is connected with a heat exchanger 3; the 3 expansion machines 2 are sequentially connected in series and then connected with the outlet of the gas storage system 4, and the inlet of each expansion machine 2 is connected with a heat exchanger 3. The high-temperature hot water heat storage and release system 5 is used for storing heat generated during air compression and releasing heat required during air expansion.
As shown in fig. 2, the high-temperature hot-water heat-storing and releasing system 5 comprises a hot-water storage tank 51 and a cold-water storage tank 52, wherein the cold-water storage tank 52 is communicated with the hot-water storage tank 51 through a gas communication pipe 53, the input end of the gas communication pipe 53 is connected with a gas supply mechanism 54, and the gas supply mechanism 54 is used for supplying high-pressure gas to the cold-water storage tank 52 and the hot-water storage tank 51 through the gas communication pipe 53 and maintaining the gas pressure in the tanks; one cold water storage tank 52 is communicated with one hot water storage tank 51 through two groups of water delivery systems 55, each of the two groups of water delivery systems 55 comprises a water delivery pipe 551 and a water pump 552, and the water pump 552 in the embodiment adopts a one-way water pump 5521, namely, one of the one-way water pumps 5521 pumps water from the hot water storage tank 51 to the cold water storage tank 52 through one group of heat exchangers 3, and the other one-way water pump 5521 pumps water from the cold water storage tank 52 to the hot water storage tank 51 through the other group of heat exchangers 3. The number of heat exchangers 3 in fig. 2 is shown only in part, and is merely an illustration, and the specific number thereof can be determined according to actual needs.
Wherein, the hot water storage tank 51 and the cold water storage tank 52 both adopt large-capacity pressure-bearing structures with the same capacity, and preferably adopt spherical tanks. Safety valves are disposed above the hot water tank 51 and the cold water tank 52 to ensure that the pressure in the water storage tank is below a safe value. The high-pressure gas is preferably nitrogen, and high-pressure air can also be used.
Wherein, the output end of the gas communicating pipe 53 is respectively connected with the top of the hot water storage tank 51 and the cold water storage tank 52, and the water inlet and the water outlet of the water conveying pipe 551 are respectively connected with the bottom of the hot water storage tank 51 and the cold water storage tank 52.
Specifically, in the present embodiment, the air supply mechanism 54 employs an air compressor, the air compressor can inflate the tank according to the pressure drop in the hot water storage tank 51 and the cold water storage tank 52 to maintain the pressure in the tank, and the real-time pressure data can be monitored by a pressure sensor (not shown in the figure, which is a conventional option in the field).
Specifically, in this embodiment, the valves 566 are installed on the water pipe 551 close to the cold water storage tank 52 and the hot water storage tank 51, on the delivery pipe close to the water pump 552, and on the gas communication pipe 53 close to the gas supply mechanism 54.
As shown in fig. 9, in the range of 50-180 ℃, the corresponding saturation pressure value changes little with the rise of temperature; after the temperature exceeds 180 ℃, the corresponding saturated pressure value rises sharply, and the pressure-bearing requirement on the storage tank is very high. Comprehensive consideration investment and power station efficiency, according to the rerum natura of water and steam, the utility model provides an adopt 180 ℃ high temperature hot water to carry out the scheme of heat-retaining, the saturation pressure that 180 ℃ hot water corresponds is 1MPa, and economic nature is best this moment, and can ensure that hot water does not boil. In this embodiment, in order to ensure safe operation of the system equipment, the maximum pressure tolerance of the cold water storage tank 52 and the hot water storage tank 51 is 1.6MPa, and the maximum temperature tolerance of the hot water storage tank 51 is more than 180 ℃.
The embodiment also provides an operation method of a compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage, the compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage in the above scheme is assembled in advance, and the operation method comprises the following steps:
1) preparation work:
before the system operates, firstly, water is injected into the cold water storage tank 52 and the water delivery pipe 551, and then the gas supply mechanism 54 is started to input high-pressure gas into the cold water storage tank 52 and the hot water storage tank 51 so as to enable the pressure in the tanks to reach a pressure set value of more than 1 MPa; after the subsequent system operates, when the gas pressure is reduced, the gas supply mechanism 54 is automatically started to supplement gas to the system, and the gas pressure is maintained to be not lower than the pressure set value of 1 MPa;
2) energy storage and heat storage processes:
the first-stage compressor 1 is electrified and started to compress air to high pressure, the temperature of the air is increased in the compression process, the air enters the next-stage compressor 1 after being cooled by the heat exchanger 3 to be compressed again, and the like is performed until the air is compressed in multiple stages and then is stored in the air storage system 4, so that the conversion from electric energy to air pressure energy is completed; meanwhile, the water pump 552 is started to deliver the low-temperature cold water in the cold water storage tank 52 to the heat exchanger 3 to be heated to a high-temperature set value of 180 ℃ in the process of cooling the high-temperature air, and then the low-temperature cold water is delivered to the hot water storage tank 51 to be stored, the high-pressure gas in the hot water storage tank 51 flows into the cold water storage tank 52 through the gas communicating pipe 53 along with the rise of the water level, when the heat storage process is finished, the water level in the cold water storage tank 52 is lowered to a protection water level, and the upper part of the cold water storage tank is replaced by the high-pressure gas;
3) energy release and heat release processes:
releasing compressed air from an air storage system 4, heating the compressed air by a heat exchanger 3, then entering a first-stage expander 2 to perform expansion and work, heating the compressed air by the heat exchanger 3 after the work of the compressed air is completed, then entering a next-stage expander 2 to perform expansion and work, and so on, discharging the compressed air into the atmosphere after the multi-stage expansion of the compressed air is completed, and completing the conversion from pressure energy to electric energy; meanwhile, the water pump 552 is started to send the high-temperature hot water in the hot water storage tank 51 to the heat exchanger 3 to heat the gas, the hot water is cooled to a low-temperature set value of 50 ℃ and then sent to the cold water storage tank 52 to be stored, the high-pressure gas in the cold water storage tank 52 flows into the hot water storage tank 51 through the gas communicating pipe 53 along with the rise of the water level, when the heat release process is finished, the water level in the hot water storage tank 51 is lowered to a protective water level, and the upper part of the hot water storage tank is replaced by the high-pressure gas;
and (3) repeating the step 2) and the step 3) to circularly realize the storage and release of the electric energy and the heat.
The water injected into the cold water storage tank 52 and the water delivery pipe 551 is demineralized water or tap water, the air in the water delivery pipe 551 needs to be emptied, and the water level in the cold water storage tank 52 is not lower than the protection water level.
Wherein, the inlet and outlet near each heat exchanger is provided with a valve, when any one heat exchanger works, the valves at the inlet and outlet of other heat exchangers are all in a closed state.
Example two
As shown in fig. 3, the present embodiment is different from the first embodiment in that: the high-temperature hot water heat storage and storage system 5 of the present embodiment is provided with three hot water storage tanks 51 and three cold water storage tanks 52, and the amount of the hot water storage tanks 51 and the cold water storage tanks 52 is appropriately increased to increase the overall energy storage and heat storage capacity of the system, thereby improving the energy storage and heat storage efficiency. Specifically, in order to supply the water transfer amount between the three hot water storage tanks 51 and the three cold water storage tanks 52, three one-way water pumps 5521 are respectively arranged on each group of water transfer pipes 551, so that the water transfer efficiency is improved, that is, one-way water pump 5521 is correspondingly arranged on each hot water storage tank 51 and each cold water storage tank 52.
EXAMPLE III
As shown in fig. 4, the present embodiment is different from the first embodiment in that: the high-temperature hot water storage and heat storage system 5 of the present embodiment is only provided with one group of water delivery systems 55, specifically, the water pump 552 in the present embodiment adopts a bidirectional water pump 5522, which can be used for pumping water from the hot water storage tank 51 to the cold water storage tank 52 through the heat exchanger 3 via the water delivery pipe 551 and pumping water from the cold water storage tank 52 to the hot water storage tank 51 through the heat exchanger 3, and the water delivery direction can be switched.
As shown in fig. 5, the compressor 1 and the expander 2 in the compressed air energy storage system of the present embodiment are connected in parallel and share a set of heat exchangers 3, that is: when the compressor 1 works, the inlet and the outlet of the expander 2 are closed; when the expander 2 works, the inlet and the outlet of the compressor 1 are closed; the inlet and outlet of the compressor 1 and the expander 2 are both provided with valves.
Example four
As shown in fig. 6, the present embodiment is different from the third embodiment in that: the high-temperature hot water heat storage and storage system 5 of the embodiment is provided with three hot water storage tanks 51 and three cold water storage tanks 52, the three hot water storage tanks 51 and the three cold water storage tanks 52 are respectively arranged at intervals and are all positioned on the same horizontal plane, the number of the hot water storage tanks 51 and the cold water storage tanks 52 can be increased properly, the overall energy storage and heat storage capacity of the system can be improved, and the energy storage and heat storage efficiency is improved. Specifically, in order to supply the water transfer amount between the three hot water storage tanks 51 and the three cold water storage tanks 52, three bidirectional water pumps 5522 are arranged on the water transfer pipes 551, so that the water transfer efficiency is improved, that is, one bidirectional water pump 5522 is correspondingly arranged on each hot water storage tank 51.
EXAMPLE five
As shown in fig. 7, the present embodiment is different from the second embodiment in that: the cold water storage tank 52 and the hot water storage tank 51 of the embodiment both adopt C-shaped horizontal tanks, and are suitable for heat storage systems with smaller demand for volume.
EXAMPLE six
As shown in fig. 8, the present embodiment is different from the first embodiment in that: the multistage compression system of this embodiment is provided with the air cooling system, and the air cooling system includes air cooler 6 and rather than the cooling tower 7 of intercommunication, and air cooler connects in the middle of heat exchanger export and next compressor import for further reduce the temperature of the air that comes out from the heat exchanger, make each grade high temperature exhaust get into next stage after cold water cooling, thereby improve compression efficiency.
According to the utility model discloses a description and attached drawing, the field technical personnel make or use very easily the utility model discloses an adopt compressed air energy storage system of high-pressure high temperature hot water heat accumulation to can produce the positive effect that the utility model discloses record.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass both fixed and removable connections, or integral connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (7)
1. The utility model provides an adopt compressed air energy storage system of high-pressure high temperature hot water heat accumulation, compressed air energy storage system includes multistage compressor (1), multistage expander (2), a plurality of heat exchangers (3) and gas storage system (4) of being connected with multistage compressor (1) and multistage expander (2) respectively, its characterized in that still stores thermal system (5) including the high temperature hot water that is used for storing the heat that compressor (1) compressed air produced, required heat when being used for releasing expander (2) expanding air, high temperature hot water stores up exothermic system (5) and includes:
at least one hot water storage tank (51) for storing hot water at high temperature;
at least one cold water storage tank (52) for storing cold water at low temperature;
the at least one cold water storage tank (52) is communicated with the at least one hot water storage tank (51) through a gas communicating pipe (53), the input end of the gas communicating pipe (53) is connected with a gas supply mechanism (54), and the gas supply mechanism (54) is used for supplying high-pressure gas for the first charging to the cold water storage tank (52) and the hot water storage tank (51) through the gas communicating pipe (53) and maintaining the air pressure in the tanks after the system is operated;
the at least one cold water storage tank (52) is communicated with the at least one hot water storage tank (51) through at least one group of water delivery systems (55), each group of water delivery systems (55) comprises a water delivery pipe (551) and a water pump (552), and the water pump (552) is used for pumping water from the hot water storage tank (51) to the direction of the cold water storage tank (52) through the heat exchanger (3) through the water delivery pipe (551) and/or pumping water from the cold water storage tank (52) to the direction of the hot water storage tank (51) through the heat exchanger (3).
2. The compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage according to claim 1, wherein: the volume between the at least one cold water storage tank (52) and the at least one hot water storage tank (51) is the same or the volume of the at least one cold water storage tank (52) is slightly smaller than the volume of the at least one hot water storage tank (51).
3. The compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage according to claim 1, characterized in that: the highest pressure bearing value of the at least one cold water storage tank (52) and the at least one hot water storage tank (51) needs to reach at least 1.5MPa, and the highest temperature bearing value of the at least one hot water storage tank (51) needs to reach at least 180 ℃; the working temperature of the hot water storage tank (51) is 180 ℃, and the pressure of the high-pressure gas is not lower than 1 MPa.
4. The compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage according to claim 1, wherein: the number of the cold water storage tanks (52) and the number of the hot water storage tanks (51) are respectively set to be multiple, and the multiple cold water storage tanks (52) and the multiple hot water storage tanks (51) are arranged at intervals and are positioned on the same horizontal plane.
5. The compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage according to claim 1, characterized in that: the number of the water delivery systems (55) is two, wherein the water pumps (552) on one group of the water delivery systems (55) pump water from the hot water storage tank (51) to the cold water storage tank (52) through the water delivery pipes (551), and the water pumps (552) on the other group of the water delivery systems (55) pump water from the cold water storage tank (52) to the hot water storage tank (51) through the water delivery pipes (551).
6. The compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage according to claim 1, wherein: the water pump (552) adopts a unidirectional water pump (5521) or a bidirectional water pump (5522).
7. The compressed air energy storage system adopting high-pressure high-temperature hot water for heat storage according to claim 1, wherein: valves (56) are respectively arranged on the water conveying pipes (551) close to the cold water storage tank (52) and the hot water storage tank (51), the conveying pipes close to the water pump (552) and the gas communicating pipe (53) close to the gas supply mechanism (54).
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