Absorption heat pump coupling water pumping compressed air energy storage system and operation method

Abstract

The invention relates to the technical field of compressed air energy storage, and discloses an absorption heat pump coupling water pumping compressed air energy storage energy storage system and an operation method. The energy storage system comprises a compressed air subsystem, a heat exchange subsystem and a heat pump circulation subsystem. And an air compressor and a water pumping generator set in the compressed air subsystem can compress air in the water-air co-containing cabin. A heat exchanger in the heat exchange subsystem can absorb heat generated in the air compressing process to heat a low-temperature heat exchange medium into a high-temperature heat exchange medium. And then the high-temperature heat exchange medium enters a generator of the heat pump circulation subsystem. And the solvent is driven by the high-temperature heat exchange medium to sequentially circulate among the generator, the condenser, the evaporator and the absorber. Heat generated in the air compression process is extracted through the heat exchange subsystem, the heat pump circulation subsystem is driven to operate, and a solvent changes the physical state in the circulation process and can be utilized in different modes, so that the heat in the air compression stage is utilized, and energy waste is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to an energy storage system and an operating method for an absorption heat pump coupled with water-pumped compressed air energy storage. Background Art

[0002] Pumped compressed air energy storage technology is a new energy storage technology that combines the advantages of pumped storage and compressed air energy storage. During periods of low electricity consumption, excess electricity can be used to drive an air compressor to compress the air in the water-gas co-containment chamber to a high-pressure state and store it. At the same time, excess electricity is used to pump water from a low water level to a high-water level water-gas co-containment chamber for storage and further compress the air to form a water energy reserve. During peak electricity consumption periods, the high-pressure air is released and heated in a combustion chamber (traditional method) or using stored heat energy (adiabatic method) to drive a turbine to generate electricity. At the same time, the stored water energy is released to drive the turbine to generate electricity, further increasing power output. This is of great significance for balancing the load on the power grid and alleviating the contradiction between electricity supply and demand.

[0003] However, the existing pumped compressed air energy storage system has a large heat loss during the air compression stage, resulting in energy waste and low energy utilization of the system as a whole. Summary of the Invention

[0004] In view of this, the present invention provides an energy storage system and operation method of an absorption heat pump coupled with pumped compressed air energy storage to solve the problems of large heat loss and energy waste in the air compression stage of the existing pumped compressed air energy storage system, as well as low energy utilization of the entire system.

[0005] In a first aspect, the present invention provides an energy storage system that combines an absorption heat pump with pumped water and compressed air for energy storage, comprising:

[0006] A compressed air subsystem comprising: a water-gas co-containment chamber, an air compressor, a water reservoir, and a pumping generator set. The air compressor is connected to the water-gas co-containment chamber and is used to compress the air in the water-gas co-containment chamber. The pumping generator set is connected to the water reservoir and also to the water-gas co-containment chamber and is used to pump water from the water reservoir into the water-gas co-containment chamber to compress the air therein.

[0007] A heat exchange subsystem comprising: a heat exchanger, a heat storage element, and a cold storage element; the heat exchanger is disposed in the water-vapor co-containment chamber and is used to absorb heat in the water-vapor co-containment chamber; the heat storage element and the cold storage element are both connected to the heat exchanger; the heat storage element stores a high-temperature heat exchange medium, and the cold storage element stores a low-temperature heat exchange medium;

[0008] A heat pump circulation subsystem includes: a generator, a condenser, an evaporator and an absorber. The heat exchange medium inlet of the generator is connected to the heat storage component, the heat exchange medium outlet of the generator is connected to the cold storage component, the solvent outlet of the generator is connected to the condenser inlet, the condenser outlet is connected to the evaporator inlet, the evaporator outlet is connected to the absorber solvent inlet, and the absorber solvent outlet is connected to the generator solvent inlet. The high-temperature heat exchange medium of the heat storage component enters the generator, the solvent absorbs heat and then circulates in the generator, the condenser, the evaporator and the absorber in sequence.

[0009] Beneficial effects

[0010] The compressed air subsystem compresses the air in the water-gas co-containment chamber through an air compressor and a pumping generator set. Heat is generated during the air compression process, and the heat exchanger absorbs this heat to heat the low-temperature heat exchange medium to a high-temperature heat exchange medium. The high-temperature heat exchange medium then enters the generator, where the solvent in the generator absorbs the heat for heat storage. The solvent circulates sequentially between the generator, condenser, evaporator, and absorber. During the circulation process, the solvent changes its physical state and can be utilized in different ways at different stages. Therefore, this energy storage system can store the heat from the air compression stage for subsequent use, avoiding energy waste and achieving a high energy utilization rate.

[0011] In an optional embodiment, the energy storage system of an absorption heat pump coupled with pumped compressed air energy storage further includes a heat-using subsystem, which includes a first heat-using pipe, a second heat-using pipe, and a third heat-using pipe. The outlet end of the first heat-using pipe is connected to the absorber, the inlet end of the second heat-using pipe is connected to the absorber and the outlet end is connected to the condenser, and the inlet end of the third heat-using pipe is connected to the condenser.

[0012] Beneficial effects

[0013] The heat subsystem can absorb and extract heat for utilization through the absorber and condenser in sequence. The energy storage system can not only convert electrical energy but also provide heat, thus realizing combined heat and power.

[0014] In an optional embodiment, the pumping generator set is connected to the evaporator via a first water pipeline, and the evaporator is connected to the water-gas co-containment tank via a second water pipeline.

[0015] Beneficial effects

[0016] The water pumped by the pumped generator set can exchange heat with the solvent in the evaporator. The solvent absorbs the heat of the water to cool the water, thereby enhancing the compression and heat exchange effect of the water in the water-gas co-container.

[0017] In an optional embodiment, the solvent is a refrigerant-absorbent mixed solvent, and the refrigerant-absorbent mixed solvent is a water-lithium bromide mixed solvent or an ammonia-water mixed solvent.

[0018] In a second aspect, the present invention further provides a method for operating an energy storage system of an absorption heat pump coupled with pumped water and compressed air energy storage, which is applied to the energy storage system, comprising:

[0019] Compress the air in the water-gas containing tank through the compressed air subsystem;

[0020] The heat exchanger absorbs the heat of the compressed air, heats the low-temperature heat exchange medium transported from the cold storage component to a high-temperature heat exchange medium and transports it to the hot storage component;

[0021] The heat pump circulation subsystem absorbs the heat of the high-temperature heat exchange medium in the heat storage element.

[0022] Beneficial effects

[0023] Because the energy storage system operation method is applied to the energy storage system of absorption heat pump coupled with pumped compressed air energy storage, it has the same effect as the energy storage system of absorption heat pump coupled with pumped compressed air energy storage, and will not be repeated here.

[0024] In an optional embodiment, the step of the heat pump circulation subsystem absorbing heat from the high-temperature heat exchange medium in the heat storage element includes:

[0025] The solvent in the generator absorbs the heat of the high-temperature heat exchange medium to form saturated refrigerant vapor;

[0026] The saturated refrigerant vapor enters the condenser to form a saturated refrigerant liquid;

[0027] The saturated refrigerant liquid enters the evaporator to form saturated refrigerant vapor;

[0028] The saturated refrigerant vapor enters the absorber and combines with the absorbent solution to form a solvent;

[0029] The solvent enters the generator and cycles through the above steps.

[0030] In an optional embodiment, the steps of the saturated refrigerant vapor entering a condenser to form a saturated refrigerant liquid and the saturated refrigerant liquid entering an evaporator to form a saturated refrigerant vapor further include:

[0031] Cold water enters the absorber from the first heat-using pipe and absorbs heat, then enters the condenser through the second heat-using pipe and absorbs heat again, and then is discharged through the third heat-using pipe to supply hot water to users.

[0032] In an optional embodiment, the saturated refrigerant liquid enters the evaporator to form saturated refrigerant vapor and the saturated refrigerant vapor enters the absorber and is combined with the absorbent solution to form a solvent, which also includes: a pumping generator set supplies water to the evaporator, and the water is cooled by the saturated refrigerant liquid and enters the water-vapor co-containment chamber.

[0033] In an optional embodiment, the step of compressing the air in the water-gas co-containment chamber by the compressed air subsystem includes:

[0034] The air in the water-gas co-containment chamber is initially compressed by an air compressor;

[0035] The pumping generator set pumps water from the water reservoir into the water-air co-container to re-compress the air.

[0036] In an optional embodiment, the step of performing a primary compression on the air in the water-gas co-containment chamber by using an air compressor compresses the air in the water-gas co-containment chamber to a first pressure value, wherein the first pressure value is 0.5-1 MPa;

[0037] The pumping generator set pumps water from the water reservoir into the water-gas co-containment chamber, and performs a re-compression step on the air to compress the air in the water-gas co-containment chamber to a second pressure value, which is 5-12 MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 Schematic diagram of an energy storage system that combines an absorption heat pump with pumped water and compressed air for energy storage according to an embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 11. Water and gas storage tank, 12. Air compressor, 13. Water reservoir, 14. Pumping generator set, 15. First water pipeline, 16. Second water pipeline, 17. Third water pipeline, 18. Fourth water pipeline, 19. Gas pipeline;

[0042] 21. heat exchanger, 22. heat storage component, 23. cold storage component, 24. first heat exchange medium pipeline, 25. second heat exchange medium pipeline, 26. third heat exchange medium pipeline, 27. fourth heat exchange medium pipeline;

[0043] 31. Generator, 32. Condenser, 33. Evaporator, 34. Absorber, 35. Solvent pump, 36. First solvent pipeline, 37. Second solvent pipeline, 38. Third solvent pipeline, 39. Fourth solvent pipeline;

[0044] 41, the first heat pipe, 42, the second heat pipe, 43, the third heat pipe;

[0045] 51. First valve body, 52. Second valve body, 53. Third valve body, 54. Fourth valve body, 55. Fifth valve body, 56. Sixth valve body. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] The following combination Figure 1 , describing embodiments of the present invention.

[0051] According to an embodiment of the present invention, on the one hand, an energy storage system is provided that utilizes an absorption heat pump coupled with pumped compressed air energy storage, comprising: a compressed air subsystem, a heat exchange subsystem, and a heat pump circulation subsystem. The compressed air subsystem comprises: a water-gas co-containment chamber 11, an air compressor 12, a water reservoir 13, and a pumping generator set 14. The air compressor 12 is connected to the water-gas co-containment chamber 11 and is used to compress the air within the water-gas co-containment chamber 11. The pumping generator set 14 is connected to the water reservoir 13 and is also connected to the water-gas co-containment chamber 11. The pumping generator set 14 is used to pump water from the water reservoir 13 into the water-gas co-containment chamber 11 to compress the air therein. The heat exchange subsystem includes: a heat exchanger 21, a heat storage component 22 and a cold storage component 23. The heat exchanger 21 is arranged in the water-vapor co-containing chamber 11 and is used to absorb heat in the water-vapor co-containing chamber 11. The heat storage component 22 and the cold storage component 23 are both connected to the heat exchanger 21, and the heat storage component 22 stores high-temperature heat exchange medium, and the cold storage component 23 stores low-temperature heat exchange medium. The heat pump circulation subsystem includes: a generator 31, a condenser 32, an evaporator 33 and an absorber 34. The heat exchange medium inlet of the generator 31 is connected to the heat storage component 22, the heat exchange medium outlet of the generator 31 is connected to the cold storage component 23, the solvent outlet of the generator 31 is connected to the inlet of the condenser 32, the outlet of the condenser 32 is connected to the inlet of the evaporator 33, the outlet of the evaporator 33 is connected to the solvent inlet of the absorber 34, and the solvent outlet of the absorber 34 is connected to the solvent inlet of the generator 31. The high-temperature heat exchange medium of the heat storage component 22 enters the generator 31, the solvent absorbs heat and then circulates in the generator 31, the condenser 32, the evaporator 33 and the absorber 34 in sequence.

[0052] The compressed air subsystem mainly realizes the function of compressing air. It can compress the air in the water-gas co-containment tank 11 through the air compressor 12, and can also supply water and compressed air to the water-gas co-containment tank 11 through the pumping generator set 14. Specifically, the air compressor 12 is connected to the water-gas co-containment tank 11 through the gas pipeline 19, and a first valve body 51 is provided on the gas pipeline 19. The pumping generator set 14 is connected to the water reservoir 13 through the third water pipeline 17, and is also connected to the water-gas co-containment tank 11 through the fourth water pipeline 18. A fourth valve body 54 and a fifth valve body 55 are provided on the fourth water pipeline 18. The pumping generator set 14 includes a water pump and a hydro-turbine generator, both of which are connected to the water reservoir 13 and the water-gas co-containment tank 11. The water pump can pump water from the water reservoir 13 into the water-gas co-containment tank 11, using the water head energy to compress the air, while the hydro-turbine generator can use the water in the water-gas co-containment tank 11 to generate electricity. During periods of low electricity demand, excess electricity is used to drive the air compressor 12 and the water pumping generator set 14 (water pump) to compress air and store energy. During peak electricity demand, the water-gas co-container 11 discharges high-pressure gas through the sixth valve body 56, driving the turbine to generate electricity. Simultaneously, water in the water-gas co-container 11 is released to drive the water pumping generator set 14 (hydraulic turbine generator) to generate electricity.

[0053] When the compressed air subsystem operates to compress air, heat is generated. The heat exchange subsystem can collect this heat and transfer it to the heat pump circulation subsystem. Specifically, the heat exchanger 21 is located in the water-gas co-containment chamber 11, and the hot storage component 22 and the cold storage component 23 are both located outside the water-gas co-containment chamber 11. The cold storage component 23 stores a low-temperature heat exchange medium, which is connected to the heat exchanger 21 through a second heat exchange medium pipeline 25, and the low-temperature heat exchange medium is sent to the heat exchanger 21. The hot storage component 22 stores a high-temperature heat exchange medium, which is connected to the heat exchanger 21 through a first heat exchange medium pipeline 24, and the heat exchanger 21 can send the high-temperature heat exchange medium to the hot storage component 22. When the water-gas co-containment chamber 11 is used to compress air and generate heat, the heat exchanger 21 absorbs heat and heats the low-temperature heat exchange medium into a high-temperature heat exchange medium and transports it away. The heat generated during the air compression process is initially stored. The heat exchange medium can be silicone oil or mineral-based heat transfer oil, etc.

[0054] The heat pump circulation subsystem is driven by a high-temperature heat exchange medium, and the solvent can circulate in sequence between the generator 31, the condenser 32, the evaporator 33 and the absorber 34. The solvent is a refrigerant-absorbent mixed solvent, which can be a water-lithium bromide mixed solvent or an ammonia-water mixed solvent. Specifically, the heat exchange medium inlet of the generator is connected to the hot storage component 22, and the heat exchange medium outlet of the generator is connected to the cold storage component 23. After the high-temperature heat exchange medium enters the generator 31, it will exchange heat with the solvent. The high-temperature heat exchange medium will cool down and become a low-temperature heat exchange medium and return to the cold storage component 23 for recycling. The refrigerant in the solvent will absorb heat and evaporate into steam, that is, saturated refrigerant steam. The saturated refrigerant steam enters the condenser 32 from the generator 31 through the first solvent pipeline 36. The saturated refrigerant steam is condensed into a saturated refrigerant liquid in the condenser 32, and then enters the evaporator 33 from the condenser 32 through the second solvent pipeline 37. The saturated refrigerant liquid evaporates again in the evaporator 33 to become saturated refrigerant vapor, and then enters the absorber 34 from the evaporator 33 through the third solvent pipe 38. The saturated refrigerant vapor mixes with the absorbent in the absorber 34 to form a solvent, and then returns to the generator 31 through the fourth solvent pipe 39. This is a cycle of the solvent in the heat pump cycle subsystem.

[0055] In addition to the pumped water storage and compressed air storage functions of conventional pumped compressed air energy storage systems, this energy storage system can balance the load on the power grid and alleviate the contradiction between power supply and demand. At the same time, the heat generated during the air compression process can be absorbed by the heat exchange subsystem and transferred to the heat pump circulation subsystem. The heat pump circulation subsystem can use this heat to convert the physical state of the solvent during operation, realizing the storage of hot and cold. In addition, the solvent can be in different states during the circulation process and can be used in different forms, thereby using up the heat generated during the air compression process to avoid heat waste. The energy storage system has a high energy utilization rate.

[0056] In some embodiments, the heat pump circulation subsystem further includes: a solvent pump 35 , which is disposed between the generator 31 and the absorber 34 .

[0057] The solvent pump 35 is provided on the fourth solvent pipeline 39 and can pump the solvent from the absorber 34 to the generator 31. The provision of the solvent pump 35 can realize the circulation of the solvent.

[0058] In some embodiments, the energy storage system also includes a heat-using subsystem, which includes a first heat-using pipe 41, a second heat-using pipe 42 and a third heat-using pipe 43. The outlet end of the first heat-using pipe 41 is connected to the absorber 34, the inlet end of the second heat-using pipe 42 is connected to the absorber 34 and the outlet end is connected to the condenser 32, and the inlet end of the third heat-using pipe 43 is connected to the condenser 32.

[0059] The heat-using subsystem extracts and utilizes heat. Specifically, the heat-using subsystem supplies heat to users through a first heat-using pipe 41, a second heat-using pipe 42, and a third heat-using pipe 43, sequentially passing through the absorber 34 and the condenser 32. The heat-using pipes can contain water. The water enters the absorber 34 from the first heat-using pipe 41, where it absorbs heat and heats up. It then enters the condenser 32 through the second heat-using pipe 42, where it exchanges heat with the saturated refrigerant vapor. After the water temperature further rises, it is discharged through the third heat-using pipe 43, supplying hot water to users. The saturated refrigerant vapor cools down and condenses into a saturated refrigerant liquid.

[0060] The above is a specific implementation method, which essentially uses the heat generated during the air compression process to convert it into hot water, and the energy storage system realizes combined heat and power. Of course, in other embodiments, water can also be replaced by other types of media.

[0061] In other embodiments, the heat may be directly connected to the condenser 32 through a heat pipe and then discharged to the user without passing through the absorber 34 .

[0062] In some embodiments, the pumping generator set 14 is connected to the evaporator 33 through a first water pipeline 15 , and the evaporator 33 is connected to the water-gas co-containment chamber 11 through a second water pipeline 16 .

[0063] When the heat pump circulation subsystem is operating, saturated refrigerant liquid enters evaporator 33. The saturated refrigerant liquid has a low temperature. Water pumped by pumping generator set 14 enters evaporator 33 through first water pipeline 15, where it is cooled by heat exchange with the saturated refrigerant liquid. The cooling water then enters water-vapor co-containment chamber 11 through second water pipeline 16, enhancing the compression and heat exchange effect of the water within water-vapor co-containment chamber 11. Furthermore, a third valve body 53 is provided on first water pipeline 15.

[0064] On the other hand, this embodiment also provides an energy storage system operation method of an absorption heat pump coupled with water pumping and compressed air energy storage, which is applied to the energy storage system. The structure of the energy storage system is the same as the absorption heat pump coupled with water pumping and compressed air energy storage structure in the above embodiment, so it will not be repeated.

[0065] Energy storage system operation methods include:

[0066] Step 1: compress the air in the water-gas co-containment chamber 11 through the compressed air subsystem;

[0067] The compressed air subsystem compresses the air within the water-gas co-containment chamber 11. This compression method involves both air compression by the air compressor 12 and air pumping, employing a secondary compression method. This involves sequentially compressing the air by the air compressor 12 and the air pumping by the water. This secondary compression method increases the air pressure in stages, reducing pressure fluctuations at the outlet of the pumping generator set 14 and improving operational stability.

[0068] The specific steps include:

[0069] The air in the water-gas co-containment chamber 11 is initially compressed by the air compressor 12;

[0070] First, the air is compressed by the air compressor 12, and the air in the water-gas co-containment chamber 11 is gradually compressed to a first pressure value, which is generally in the range of 0.5 to 1 MPa. The air compressor 12 is a conventional device, and the working principle of the air compressor 12 is not described in detail here.

[0071] The pumping generator set 14 pumps water from the water reservoir 13 into the water-air co-container 11 to re-compress the air.

[0072] When the pressure in the water-air co-containment chamber 11 reaches the first pressure value, the pumping generator set 14 (water pump) is started to extract water from the water reservoir 13 and pump high-pressure water into the water-air co-containment chamber 11 to re-compress the air. The air in the water-air co-containment chamber 11 is compressed to a second pressure value, which is generally in the range of 5 to 12 MPa.

[0073] Step 2: The heat exchanger 21 absorbs the heat of the compressed air, heats the low-temperature heat exchange medium transported by the cold storage unit 23 to a high-temperature heat exchange medium, and transports it to the hot storage unit 22;

[0074] Heat is generated during the initial compression of the air in the water-gas co-containment chamber 11 by the air compressor 12 and the subsequent compression of the air by the pumping generator 14, which draws water from the water reservoir 13 into the water-gas co-containment chamber 11. Cold storage element 23 delivers a low-temperature heat exchange medium to heat exchanger 21, where it absorbs heat and becomes a high-temperature heat exchange medium before being delivered to hot storage element 22. The heat generated during the air compression process is absorbed and initially stored by the heat exchange medium, preventing heat loss and waste.

[0075] Step 3: The heat pump circulation subsystem absorbs the heat of the high-temperature heat exchange medium in the heat storage element 22 .

[0076] The heat storage element 22 delivers the high-temperature heat exchange medium to the heat pump circulation subsystem, driving the heat pump circulation subsystem to operate and absorb heat from the high-temperature heat exchange medium.

[0077] The specific steps include:

[0078] The solvent in the generator 31 absorbs the heat of the high-temperature heat exchange medium to form saturated refrigerant vapor;

[0079] The solvent in generator 31 is a refrigerant-absorbent binary solvent mixture, initially in liquid form. When the high-temperature heat exchange medium enters generator 31, it exchanges heat with the solvent, absorbing the heat and evaporating the refrigerant to form saturated refrigerant vapor. The high-temperature heat exchange medium cools down to a low-temperature heat exchange medium before returning to cold storage unit 23.

[0080] The saturated refrigerant vapor enters the condenser 32 and forms a saturated refrigerant liquid;

[0081] After coming out of the generator 31 , the saturated refrigerant vapor passes through the first solvent pipe 36 and enters the condenser 32 . The saturated refrigerant vapor carrying heat energy is cooled and condensed in the condenser 32 to become a saturated refrigerant liquid.

[0082] The saturated refrigerant liquid enters the evaporator 33 and forms saturated refrigerant vapor;

[0083] After coming out of the condenser 32 , the saturated refrigerant liquid passes through the second solvent pipe 37 and enters the evaporator 33 , where it is heated and evaporated again to become saturated refrigerant vapor.

[0084] The saturated refrigerant vapor enters the absorber 34 and combines with the absorbent solution to form a solvent;

[0085] After coming out of the evaporator, the saturated refrigerant vapor passes through the third solvent pipe 38 and enters the absorber 34. The saturated refrigerant vapor combines with the absorbent solution in the absorber 34 to form a mixed solvent again.

[0086] The solvent enters the generator 31 and circulates the above steps.

[0087] The solvent after the saturated refrigerant vapor and the absorbent solution are remixed enters the generator 31 through the fourth solvent pipeline 39 under the action of the solvent pump 35, thus completing a cycle.

[0088] During the operation of the energy storage system, the compressed air process will continue, and the heat exchange subsystem will continue to supply high-temperature heat exchange medium to the generator 31, so the heat pump circulation subsystem will also continue to operate, that is, the above steps will be repeated in a cycle.

[0089] In one embodiment, the saturated refrigerant vapor enters the condenser 32 to form a saturated refrigerant liquid, and the saturated refrigerant liquid enters the evaporator 33. The step of forming the saturated refrigerant vapor further includes:

[0090] The cold water enters the absorber 34 from the first heat-using pipe 41 and absorbs heat, then enters the condenser 32 through the second heat-using pipe 42 and absorbs heat again, and then is discharged through the third heat-using pipe 43 to supply hot water to the user.

[0091] The saturated refrigerant vapor entering the condenser 32 and the saturated refrigerant vapor entering the absorber 34 both carry thermal energy. The heat subsystem transports cold water through a hot pipe, and then exchanges heat with the absorber 34 and the condenser 32 in sequence to extract thermal energy, converting the heat generated during the air compression process into hot water to be supplied to users.

[0092] In one embodiment, the saturated refrigerant liquid enters the evaporator 33 to form saturated refrigerant vapor and the saturated refrigerant vapor enters the absorber 34 and is combined with the absorbent solution to form a solvent, further comprising:

[0093] The pumping generator set 14 supplies water to the evaporator 33 , and the water enters the water-gas co-accommodation chamber 11 after being cooled by the saturated refrigerant liquid.

[0094] The pumping generator set 14 (water pump) pumps water from the water reservoir 13 into the evaporator 33. The saturated refrigerant liquid entering the evaporator 33 is at a lower temperature and can pre-cool the water. The pre-cooled water then enters the water-gas co-container 11 to compress the air.

[0095] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An energy storage system of an absorption heat pump coupled with pumped water and compressed air energy storage, characterized in that: include: A compressed air subsystem, the compressed air subsystem comprising: a water-gas co-containment chamber (11), an air compressor (12), a water reservoir (13) and a pumping generator set (14); the air compressor (12) is connected to the water-gas co-containment chamber (11) and is used to compress the air in the water-gas co-containment chamber (11); the pumping generator set (14) is connected to the water reservoir (13) and is also connected to the water-gas co-containment chamber (11); the pumping generator set (14) is used to pump water in the water reservoir (13) into the water-gas co-containment chamber (11) to compress the air therein; A heat exchange subsystem, the heat exchange subsystem comprising: a heat exchanger (21), a heat storage component (22) and a cold storage component (23); the heat exchanger (21) is arranged in the water-gas co-containment chamber (11) and is used to absorb heat in the water-gas co-containment chamber (11); the heat storage component (22) and the cold storage component (23) are both connected to the heat exchanger (21); the heat storage component (22) stores a high-temperature heat exchange medium, and the cold storage component (23) stores a low-temperature heat exchange medium; A heat pump circulation subsystem, the heat pump circulation subsystem comprising: a generator (31), a condenser (32), an evaporator (33) and an absorber (34); a heat exchange medium inlet of the generator is connected to the heat storage element (22); a heat exchange medium outlet of the generator is connected to the cold storage element (23); a solvent outlet of the generator is connected to the condenser inlet; a condenser outlet is connected to the evaporator inlet; an evaporator outlet is connected to the absorber solvent inlet; and an absorber solvent outlet is connected to the generator solvent inlet; the high-temperature heat exchange medium of the heat storage element (22) enters the generator (31); the solvent absorbs heat and then circulates in sequence in the generator (31), the condenser (32), the evaporator (33) and the absorber (34).

2. The energy storage system of absorption heat pump coupled with pumped water compressed air energy storage according to claim 1 is characterized in that: The heat-using subsystem further comprises a first heat-using pipe (41), a second heat-using pipe (42) and a third heat-using pipe (43), wherein the outlet end of the first heat-using pipe (41) is connected to the absorber (34), the inlet end of the second heat-using pipe (42) is connected to the absorber (34) and the outlet end is connected to the condenser (32), and the inlet end of the third heat-using pipe (43) is connected to the condenser (32).

3. The energy storage system of absorption heat pump coupled with pumped water compressed air energy storage according to claim 1 or 2, characterized in that: The pumping generator set (14) is connected to the evaporator (33) via a first water pipeline (15), and the evaporator (33) is connected to the water-gas co-accommodation chamber (11) via a second water pipeline (16).

4. The energy storage system of absorption heat pump coupled with pumped water compressed air energy storage according to claim 1 is characterized in that: The solvent is a refrigerant-absorbent mixed solvent, and the refrigerant-absorbent mixed solvent is a water-lithium bromide mixed solvent or an ammonia-water mixed solvent.

5. A method for operating an energy storage system of an absorption heat pump coupled with pumped water and compressed air energy storage, applied to the energy storage system according to any one of claims 1 to 4, characterized in that: include: Compressing the air in the water-gas containing tank (11) through the compressed air subsystem; The heat exchanger (21) absorbs the heat of the compressed air, heats the low-temperature heat exchange medium transported by the cold storage component (23) to a high-temperature heat exchange medium, and transports the high-temperature heat exchange medium to the hot storage component (22); The heat pump circulation subsystem absorbs heat from the high-temperature heat exchange medium in the heat storage element (22).

6. The energy storage system operation method according to claim 5, characterized in that: The step of the heat pump circulation subsystem absorbing the heat of the high-temperature heat exchange medium in the heat storage element (22) comprises: The solvent in the generator (31) absorbs the heat of the high-temperature heat exchange medium to form saturated refrigerant vapor; The saturated refrigerant vapor enters the condenser (32) to form a saturated refrigerant liquid; The saturated refrigerant liquid enters the evaporator (33) to form saturated refrigerant vapor; The saturated refrigerant vapor enters the absorber (34) and combines with the absorbent solution to form a solvent; The solvent enters the generator (31) and circulates the above steps.

7. The energy storage system operation method according to claim 6, characterized in that: The saturated refrigerant vapor enters the condenser (32) to form a saturated refrigerant liquid, and the saturated refrigerant liquid enters the evaporator (33), and the step of forming the saturated refrigerant vapor further includes: Cold water enters the absorber (34) from the first heat pipe (41) and absorbs heat, then enters the condenser (32) through the second heat pipe (42) and absorbs heat again, and then is discharged through the third heat pipe (43) to supply hot water to users.

8. The energy storage system operation method according to claim 6, characterized in that: The saturated refrigerant liquid enters the evaporator (33) to form saturated refrigerant vapor and the saturated refrigerant vapor enters the absorber (34) to combine with the absorbent solution to form a solvent, further comprising: The pumping generator set (14) supplies water to the evaporator (33), and the water is cooled by the saturated refrigerant liquid and then enters the water-gas co-accommodation chamber (11).

9. The energy storage system operation method according to claim 5, characterized in that: The step of compressing the air in the water-gas co-containment chamber (11) by the compressed air subsystem comprises: The air in the water-gas co-containment chamber (11) is initially compressed by an air compressor (12); The pumping generator set (14) pumps water from the water reservoir (13) into the water-air co-containment chamber (11) to re-compress the air.

10. The energy storage system operation method according to claim 9, characterized in that: The air in the water-gas co-containment chamber (11) is compressed to a first pressure value by using an air compressor (12), wherein the first pressure value is 0.5-1 MPa; The pumping generator set (14) pumps water from the water reservoir (13) into the water-gas co-containment chamber (11), and performs a re-compression step on the air to compress the air in the water-gas co-containment chamber (11) to a second pressure value, wherein the second pressure value is 5 to 12 MPa.

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