CN112229092A - Liquid air energy storage cold and hot air combined supply system - Google Patents
Liquid air energy storage cold and hot air combined supply system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/02—Compression-sorption machines, plants, or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/04—Arrangement or mounting of control or safety devices for sorption type machines, plants or systems
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- Engineering & Computer Science (AREA)
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The embodiment of the invention provides a liquid air energy storage cold and hot gas combined supply system, which comprises: the air energy storage unit comprises an energy storage passage and an energy release passage; the energy storage passage utilizes valley electricity to compress and cool air to form liquid air for energy storage; the energy release passage converts liquid air into compressed air and outputs the compressed air. The embodiment of the invention can realize energy storage in the electricity consumption valley period by combining the liquid air energy storage technology, convert electric energy into potential energy of liquid air, realize high-density storage of compressed air, and simultaneously can utilize the compression heat to supply cold and heat for a plant area; the pressurized gasification and supply of liquid air are completed in the peak period of electricity utilization; on the one hand, the air is stored when the electricity price is valley, the air is released when the electricity price is peak, a large amount of electricity charges are saved for enterprises, on the other hand, impurities in the air are removed through the low-temperature liquefaction process, high-purity compressed air is stably output, and the economical efficiency of supplying the high-purity compressed air of the enterprises is effectively improved.
Description
Technical Field
The invention relates to the technical field of energy, in particular to a liquid air energy storage cold and hot air combined supply system.
Background
With the rapid development of global industrialization, compressed air is widely applied in various industries. The power source is one of the most widely applied power sources in the industries of metallurgy, chemical engineering, medicine, textile, beverage and the like, and has the advantages of safety, no pollution, good adjusting performance, convenient transportation and the like. However, as the consumption of compressed air increases, the power consumption of the compressor increases, and the compressor becomes the most important high-energy-consumption equipment in many enterprises, and the operation cost also increases. Meanwhile, the common compressed air contains pollutants such as oil, water, dust and the like, and the pollutants enter a compressed air pipeline system to corrode a pipeline and cause the failure of an instrument and a pneumatic tool. In the pharmaceutical and food and beverage industries, there is a great demand for highly pure compressed air.
The conventional high-purity compressed air is mainly obtained by purifying air in the atmosphere by a molecular sieve and then entering an air compressor for compression, and the compressed air is used along with the pressure and cannot be stored, so that the air compressor must be operated for 24 hours continuously, the power consumption is high, and the operating cost is high. With the increase of the peak-valley load of the power grid, different regions execute peak-valley electricity price, and the peak-valley electricity price difference of some regions is as high as 4 times. If the compressor can be operated to store compressed air during the low-peak electricity price period at night and release the compressed air during the high-peak electricity price period in the daytime, good economic benefits can be generated.
The present invention has been made in view of the above.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a liquid air energy storage cold and hot air combined supply system, which is used for solving the defects that the air in the atmosphere is purified by a molecular sieve and then enters an air compressor to be compressed, the compressed air is used along with the pressure and cannot be stored, so that the air compressor must be operated continuously for 24 hours, the power consumption is high and the operating cost is high in the conventional high-purity compressed air source in the prior art; the pressurized gasification and supply of the liquid air are completed in the peak period of electricity utilization. Therefore, on one hand, a large amount of electric charges can be saved for enterprises, on the other hand, high-purity compressed air can be stably output, and the economical efficiency of supplying the high-purity compressed air for the enterprises is effectively improved.
According to the embodiment of the invention, the liquid air energy storage cold and hot air combined supply system comprises: the air energy storage unit comprises an energy storage passage and an energy release passage;
the energy storage passage utilizes valley electricity to compress and cool air to form liquid air for energy storage;
the energy release passage converts liquid air into compressed air and outputs the compressed air.
According to one embodiment of the invention, the air energy storage unit comprises: the air compressor set, the cold accumulator, the throttling element, the low-temperature storage tank, the low-temperature pump and the valve assembly;
the air compressor set, the cold accumulator, the throttling element and the low-temperature storage tank are connected to form the energy storage passage;
the cryogenic storage tank, the cryogenic pump and the valve assembly are connected to form the energy release path.
Specifically, an arrangement scheme of an energy storage path and an energy release path is provided.
According to one embodiment of the invention, the valve assembly comprises at least two stages of pressure regulating valves for regulating the output pressure of the compressed air.
In particular, the regulation of multiple compressed air output pressures proposed by the present embodiment can satisfy the demand for compressed air at different pressures.
According to one embodiment of the invention, the air compressor package is connected to the valve assembly by a conduit.
Specifically, the present embodiment can achieve the purpose that the air compressor compresses air to form liquid air on one side and the air compressor discharges compressed air with different pressures through the valve assembly on the other side in the energy storage stage by communicating the air compressor with the valve assembly.
According to one embodiment of the invention, the air compressor set is in the form of any one or a combination of a piston type, a screw type or a centrifugal type; the air compressor unit comprises one or more compressors, and the compressors are connected in series, in parallel or integrated into the air compressor unit.
In particular, the present embodiment proposes an implementation of an air compressor package.
According to an embodiment of the present invention, further comprising: the compression heat utilization device is arranged between the air compressor unit and the cold accumulator;
the compression heat utilization device is connected with the compression heat refrigerating unit and the hot water supply unit to form a compression heat utilization loop, and the compression heat utilization loop is used for exchanging heat with air flowing from the air compressor unit to the cold accumulator.
Specifically, the present embodiment provides an implementation manner of a compression heat utilization device, in which the compression heat utilization device is connected with a compression heat refrigeration unit and a hot water supply unit to form a compression heat utilization loop, so that heat energy obtained by the compression heat utilization device in heat exchange is reasonably utilized, and the preparation of a refrigerant inside the compression heat refrigeration unit is realized through the connection of the compression heat refrigeration unit.
Furthermore, the waste heat after passing through the compression heat refrigerating unit is recycled through the hot water supply unit, the hot water supply unit exchanges heat with the waste heat to heat domestic water or other regional hot water needing hot water supply, and simultaneously, after passing through the hot water supply unit, the medium in the compression heat utilization device flows back to the compression heat utilization device to be recycled.
According to an embodiment of the present invention, further comprising: and the refrigerating unit is connected with the air compressor unit and comprises a precooling loop, and the precooling loop is used for precooling the air entering the energy storage passage.
Particularly, the precooling loop is arranged in the embodiment, so that precooling of air entering the energy storage channel is realized, the refrigerating unit runs in the energy storage process, valley electricity can be conveniently adopted to drive the refrigerating unit, the running cost of the system is reduced, and the economic feasibility of the system is further ensured.
According to one embodiment of the invention, the refrigeration unit is an electrically driven refrigeration unit comprising a compressor, a first condenser, an expansion valve and a first evaporator connected to form a pre-cooling circuit;
wherein the first evaporator is connected with the air compressor unit;
the electric drive refrigerating unit and the air energy storage unit are coupled through the first evaporator, so that precooling of air entering the air energy storage passage is achieved.
Specifically, a setting scheme of a precooling loop is provided, wherein a low-temperature low-pressure dry saturated gaseous refrigerant enters a compressor under the action of valley electricity, and forms a high-temperature high-pressure dry saturated gaseous refrigerant after adiabatic compression by the compressor, so that the preparation of the refrigerant is realized.
According to one embodiment of the invention, the refrigeration unit is an absorption refrigeration unit, and the pre-cooling circuit comprises a refrigerant solution circulation circuit and a refrigerant vapor circulation circuit;
wherein the refrigerant solution circulation circuit is used for preparing the refrigerant vapor of the refrigerant vapor circulation circuit;
the refrigerant vapor circulation loop is used for pre-cooling the air entering the energy storage passage.
Specifically, the absorption refrigerating unit is adopted to reduce the compression power consumption of the liquid air energy storage cold and hot gas combined supply system, industrial waste heat or solar photo-heat is used as a heat source for driving the absorption refrigerating unit, the operation cost of the system can be reduced, and the energy utilization rate and the circulation efficiency of the liquid air energy storage cold and hot gas combined supply system are improved.
According to one embodiment of the invention, the absorption chiller unit comprises: the system comprises a first generator, a second condenser, a first throttling valve, a second evaporator, a heat exchanger, a second throttling valve, an absorber and a refrigerant circulating pump;
the first generator, the heat exchanger, the first throttling valve, the absorber and the refrigerant circulating pump are connected to form the refrigerant solution circulating loop;
the first generator, the second condenser, the second throttle valve, the second evaporator, the absorber, the heat exchanger, and the refrigerant circulation pump are connected to form the refrigerant vapor circulation circuit;
the absorption refrigeration unit and the air energy storage unit are coupled through the second evaporator, so that precooling of air entering the air compressor unit is achieved.
Specifically, a refrigerant solution circulation loop and a refrigerant steam circulation loop are provided, wherein low-temperature and low-pressure dry saturated gaseous refrigerant enters a compressor under the action of valley electricity, and forms high-temperature and high-pressure dry saturated gaseous refrigerant after being subjected to adiabatic compression by the compressor, so that the preparation of the refrigerant is realized.
Further, in a refrigerant solution circulation loop in the energy storage stage, the refrigerant solution is heated in a first generator to generate hot refrigerant concentrated solution, the refrigerant concentrated solution flows through a heat exchanger to be cooled, the cooled refrigerant concentrated solution flows through a first throttling valve to enter an absorber, the refrigerant concentrated solution and refrigerant steam in the absorber form refrigerant dilute solution, and the refrigerant dilute solution is sent into a second evaporator through a refrigerant circulation pump.
Further, in a refrigerant vapor circulation loop in the energy storage stage, a refrigerant solution is heated and evaporated in a first generator to form refrigerant vapor, the refrigerant vapor flows through a second condenser to form liquid refrigerant, the liquid refrigerant flows through a second throttling valve to enter a second evaporator, the liquid refrigerant in the second evaporator exchanges heat with air at normal temperature and normal pressure to form refrigerant vapor, and the refrigerant vapor after heat exchange enters an absorber.
According to one embodiment of the invention, the absorption refrigerating unit realizes the preparation of the circulation loop by using any one or a combination of valley electricity, solar energy and industrial waste heat.
Particularly, any one or combination of several of low ebb electricity, solar energy and industrial waste heat is converted into heat energy to be used as a heat source of absorption refrigeration, and absorption refrigeration circulation is driven to pre-cool air at an inlet of an air compressor set, so that compression power consumption can be effectively reduced, and energy utilization efficiency and electric energy conversion efficiency of a liquid air energy storage cold and hot gas combined supply system are improved.
One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: according to the liquid air energy storage cold and hot gas combined supply system provided by the embodiment of the invention, the energy storage can be realized at the electricity utilization valley time period by combining the liquid air energy storage technology, the electric energy is converted into the potential energy of the liquid air, the high-density storage of the compressed air is realized, and meanwhile, the compressed heat can be utilized for supplying cold and heat to a plant area; the pressurized gasification and supply of the liquid air are completed in the peak period of electricity utilization. On the one hand, the air can be stored in the valley of the electricity price, and the air is released in the peak of the electricity price, so that a large amount of electricity charges are saved for enterprises, on the other hand, impurities in the air can be removed through the low-temperature liquefaction process, high-purity compressed air is stably output, and the economical efficiency of supplying the high-purity compressed air for the enterprises is effectively improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a first schematic view of a working process of a liquid air energy storage combined cooling and heating air supply system according to an embodiment of the present invention;
fig. 2 is a second schematic view of a working process of the liquid air energy storage combined cooling and heating air supply system according to the embodiment of the invention;
fig. 3 is a third schematic view of a working process of the liquid air energy storage combined cooling and heating air supply system according to the embodiment of the invention;
fig. 4 is a fourth schematic view of a working process of the liquid air energy storage combined cooling and heating air supply system according to the embodiment of the present invention.
Reference numerals:
10. an air compressor unit; 11. a compression heat utilizing device; 12. a regenerator; 13. a throttling element; 14. a low-temperature storage tank; 15. a cryopump; 16. a valve assembly; 17. a first evaporator;
20. a compressor; 21. a first condenser; 22. an expansion valve;
30. a first generator; 31. a second condenser; 32. a first throttle valve; 33. a heat exchanger; 34. a second throttle valve; 35. an absorber; 36. a refrigerant circulating pump; 37. a second evaporator;
40. a compression heat refrigerating unit;
50. hot water supply unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Fig. 1 to 4 are first to fourth schematic diagrams illustrating a working process of a liquid air energy storage combined cooling and heating air supply system according to an embodiment of the present invention. Fig. 1 to 4 show four embodiments of the liquid air energy storage combined cooling and heating system of the present invention.
As can be seen from fig. 1 to 4, in the liquid air energy storage combined cooling and heating system adopted in the present invention, the air energy storage unit includes: an air compressor set 10, a cold accumulator 12, a throttling element 13, a low-temperature storage tank 14, a low-temperature pump 15 and a valve assembly 16; the air compressor unit 10, the cold accumulator 12, the throttling element 13 and the low-temperature storage tank 14 are connected to form an energy storage passage; the cryogenic tank 14, cryogenic pump 15 and valve assembly 16 are connected to form a discharge path. Further comprising: a compression heat utilization device 11 provided between the air compressor unit 10 and the cold storage 12; and is connected with the absorption refrigerating unit and the hot water supply unit 50 to form a compression heat utilization circuit, and the compression heat utilization circuit is used for exchanging heat with the air flowing from the air compression unit 10 to the cold accumulator 12.
It should be noted that, according to the present invention, by providing the valve assembly 16, the requirements according to different pressures and flow rates can be met, and the supply of the compressed air of the energy release path can be regulated, so as to meet the requirements of the compressed air demand side on the compressed air with different pressures and different flow rates.
It should be noted that, in the present invention, the off-peak electricity liquid air energy storage technology is combined, and when the electricity price is off, on one hand, the supply of the compressed air is realized by the off-peak electricity through the air compressor unit 10 and the valve assembly 16, and on the other hand, the off-peak electricity and the liquid air energy storage technology are utilized to store the off-peak electricity in a liquid state by the compressed air, so that the air is released when the electricity price is off, thereby saving a lot of electricity charges for the enterprise.
In addition, fig. 2 shows an embodiment of a liquid air energy storage combined cooling and heating system, and in fig. 2, it can be seen that the air compressor unit 10 is connected with the valve assembly 16 through a pipeline, and by communicating the air compressor 20 with the valve assembly 16, it is possible to compress air to form liquid air on one side by the air compressor 20 and supply compressed air with different pressures by the valve assembly 16 on the other side in the energy storage stage.
In addition, fig. 3 provides an embodiment of a liquid air energy storage cold and hot air combined supply system, and as can be seen from fig. 3, the system further includes a refrigeration unit connected to the air compressor unit 10, where the refrigeration unit includes a pre-cooling loop for pre-cooling air entering the energy storage path. The refrigerating unit is an electrically driven refrigerating unit which comprises a compressor 20, a first condenser 21, an expansion valve 22 and a first evaporator 17 which are connected to form a precooling loop; wherein the first evaporator 17 is connected with the air compressor unit 10; the electric drive refrigerating unit and the air energy storage unit are coupled through the first evaporator 17, and precooling of air entering the air energy storage passage is achieved.
Meanwhile, fig. 4 shows an embodiment of a liquid air energy storage cold and hot air combined supply system, and as can be seen from fig. 4, the system further includes a refrigerating unit connected to the air compressor unit 10, where the refrigerating unit includes a pre-cooling loop for pre-cooling air entering the energy storage path. The refrigerating unit is an absorption refrigerating unit, and the precooling loop comprises a refrigerant solution circulating loop and a refrigerant steam circulating loop; wherein the refrigerant solution circulation circuit is used for preparing refrigerant vapor of the refrigerant vapor circulation circuit; the refrigerant vapor circulation circuit is used for pre-cooling the air entering the energy storage passage.
Further, as shown in fig. 2, in the energy storage stage, a part of the air compressed by the air compressor unit 10 is used to form liquid air, and the other part of the air is directly used for outputting the compressed air.
Further, as shown in fig. 3, in the energy storage path in the energy storage stage, the air at normal temperature and normal pressure passes through the first evaporator 17 to exchange heat with the wet saturated gaseous refrigerant at low temperature and low pressure, the wet saturated gaseous refrigerant at low temperature and low pressure after the heat exchange is gasified to form the dry saturated gaseous refrigerant at low temperature and low pressure and flow into the compressor 20, the air at low temperature and normal pressure after the heat exchange enters the air compressor set 10 to be compressed to form air at normal temperature and high pressure, the air at normal temperature and high pressure passes through the cold accumulator 12 to be heat exchanged to form air at low temperature and high pressure, and the air at low temperature and high pressure passes through the pressure reduction device to be reduced.
Further, as shown in fig. 4, in the refrigerant solution circulation loop in the energy storage stage, the refrigerant solution is heated in the first generator 30 to generate hot refrigerant rich solution, and the refrigerant rich solution passes through the heat exchanger 33 to be cooled, the cooled refrigerant rich solution passes through the first throttle valve 32 to enter the absorber 35, the refrigerant rich solution and the refrigerant vapor form refrigerant lean solution in the absorber 35, and the refrigerant lean solution is sent to the second evaporator 37 through the refrigerant circulation pump 36.
In the refrigerant vapor circulation loop of the energy storage stage, the refrigerant solution is heated and evaporated in the first generator 30 to form refrigerant vapor, the refrigerant vapor flows through the second condenser 31 to form liquid refrigerant, the liquid refrigerant flows through the second throttle valve 34 to enter the second evaporator 37, the liquid refrigerant exchanges heat with the air at normal temperature and normal pressure in the second evaporator 37 to form refrigerant vapor, and the refrigerant vapor after heat exchange enters the absorber 35.
In the energy storage path in the energy storage stage, the air at normal temperature and normal pressure flows through the second evaporator 37 to exchange heat with the refrigerant steam, the air at low temperature and normal pressure after heat exchange enters the air compressor unit 10 to be compressed to form air at normal temperature and high pressure, the air at normal temperature and high pressure flows through the cold accumulator 12 to exchange heat to form air at low temperature and high pressure, and the air at low temperature and high pressure flows through the pressure reduction device to be reduced in pressure to form liquid air at low temperature and normal pressure and is stored in the low-temperature storage.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In some embodiments of the present invention, as shown in fig. 1 to 4, the present disclosure provides a liquid air energy storage combined cooling and heating system, including: the air energy storage unit comprises an energy storage passage and an energy release passage; the energy storage passage compresses and cools air by utilizing valley electricity to form liquid air for storing energy; the energy release passage converts liquid air into compressed air and outputs the compressed air.
The liquid air energy storage cold and hot air combined supply system provided by the scheme can realize energy storage in a low-ebb period of power consumption, convert electric energy into potential energy of liquid air, realize high-density storage of compressed air, and simultaneously utilize the compressed heat for cold supply and heat supply; the pressurized gasification and supply of the liquid air are completed in the peak period of electricity utilization. Therefore, on one hand, a large amount of electric charges can be saved for enterprises, on the other hand, high-purity compressed air can be stably output, and the economical efficiency of supplying the high-purity compressed air for the enterprises is effectively improved.
In some embodiments, the air energy storage unit comprises: an air compressor set 10, a cold accumulator 12, a throttling element 13, a low-temperature storage tank 14, a low-temperature pump 15 and a valve assembly 16; the air compressor unit 10, the cold accumulator 12, the throttling element 13 and the low-temperature storage tank 14 are connected to form an energy storage passage; the cryogenic tank 14, cryogenic pump 15 and valve assembly 16 are connected to form a discharge path.
Specifically, an arrangement scheme of an energy storage path and an energy release path is provided.
In some embodiments, the valve assembly 16 includes at least two stages of pressure regulating valves for regulating the output pressure of the compressed air.
In particular, the regulation of multiple compressed air output pressures proposed by the present embodiment can satisfy the demand for compressed air at different pressures.
In some embodiments, the air compressor package 10 is connected to the valve assembly 16 by a conduit.
Specifically, the present embodiment can achieve the effect that the air compressor 20 compresses air to form liquid air on one side and the valve assembly 16 releases the compressed air to supply air with different pressures on the other side during the energy storage stage by communicating the air compressor 20 with the valve assembly 16.
In some embodiments, the air compressor package 10 is in the form of any one or a combination of pistons, screws, or centrifuges; the air compressor assembly 10 includes one or more compressors 20, and the compressors 20 are connected in series, in parallel, or integrated into the air compressor assembly 10.
Specifically, the present embodiment provides an embodiment of an air compressor package 10.
In some embodiments, further comprising: a compression heat utilization device 11 provided between the air compressor unit 10 and the cold storage 12; the compression heat utilization device 11 is connected to the compression heat refrigerator group 40 and the hot water supply group 50 to form a compression heat utilization circuit for exchanging heat with air flowing from the air compressor group 10 to the cold storage 12.
Specifically, the present embodiment proposes an implementation of the compression heat utilization device 11, in which the compression heat utilization device 11 is connected with the compression heat refrigeration unit 40 and the hot water supply unit 50 to form a compression heat utilization circuit, so that the heat energy obtained by the compression heat utilization device 11 in the heat exchange is reasonably utilized, and the preparation of the refrigerant inside the compression heat refrigeration unit 40 is realized through the connection of the compression heat refrigeration unit 40.
Further, the waste heat after passing through the compression heat refrigeration unit 40 is reused by the hot water supply unit 50, the hot water supply unit 50 performs heat exchange with the waste heat to heat domestic water or other regional hot water requiring hot water supply, and after passing through the hot water supply unit 50, the medium in the compression heat utilization device 11 flows back to the compression heat utilization device 11 to be reused.
It should be noted that the compression heat refrigeration unit 40 is similar to the absorption refrigeration unit in structure and includes a second generator, a condensation unit, an expansion unit and a third evaporator, wherein the second generator is connected to the compression heat utilization device 11, the high-temperature heat energy obtained by heat exchange between the compression heat utilization device 11 and air is input into the second generator, the second generator obtains the heat energy and then generates high-temperature and high-pressure refrigerant vapor, the high-temperature and high-pressure refrigerant vapor is condensed into liquid state in the condensation unit, and enters the third evaporator after throttling and pressure reduction by the expansion unit, and the heat is absorbed and vaporized under a lower evaporation pressure to realize refrigeration, thereby realizing reuse of the heat energy.
It should be further noted that, at the same time, the heat energy still has the waste heat after passing through the absorption refrigeration unit, and the waste heat enters the hot water supply unit 50 through the pipeline to realize the heat exchange of the cold water or the normal temperature water, so as to realize the heating of the water, and the water after obtaining the heat energy can be used as the living needs or the industrial production needs.
In some embodiments, further comprising: and the refrigerating unit is connected with the air compressor unit 10 and comprises a precooling loop, and the precooling loop is used for precooling the air entering the energy storage passage.
Particularly, the precooling loop is arranged in the embodiment, so that precooling of air entering the energy storage channel is realized, the refrigerating unit runs in the energy storage process, valley electricity can be conveniently adopted to drive the refrigerating unit, the running cost of the system is reduced, and the economic feasibility of the system is further ensured.
In some embodiments, the refrigeration unit is an electrically driven refrigeration unit comprising a compressor 20, a first condenser 21, an expansion valve 22, and a first evaporator 17 connected to form a pre-cooling loop; wherein the first evaporator 17 is connected with the air compressor unit 10; the electric drive refrigerating unit and the air energy storage unit are coupled through the first evaporator 17, and precooling of air entering the air energy storage passage is achieved.
Specifically, an arrangement scheme of the pre-cooling circuit is provided, in which a low-temperature low-pressure dry saturated gaseous refrigerant enters the compressor 20 under the action of off-peak electricity, and is subjected to adiabatic compression by the compressor 20 to form a high-temperature high-pressure dry saturated gaseous refrigerant, so that the preparation of the refrigerant is realized.
In some embodiments, the refrigeration unit is an absorption refrigeration unit, the pre-cooling circuit comprising a refrigerant solution circulation circuit and a refrigerant vapor circulation circuit; wherein the refrigerant solution circulation circuit is used for preparing refrigerant vapor of the refrigerant vapor circulation circuit; the refrigerant vapor circulation circuit is used for pre-cooling the air entering the energy storage passage.
Specifically, the absorption refrigerating unit is adopted to reduce the compression power consumption of the liquid air energy storage cold and hot gas combined supply system, industrial waste heat or solar photo-heat is used as a heat source for driving the absorption refrigerating unit, the operation cost of the system can be reduced, and the energy utilization rate and the circulation efficiency of the liquid air energy storage cold and hot gas combined supply system are improved.
In some embodiments, an absorption refrigeration unit comprises: a first generator 30, a second condenser 31, a first throttle valve 32, a second evaporator 37, a heat exchanger 33, a second throttle valve 34, an absorber 35, and a refrigerant circulation pump 36; the first generator 30, the heat exchanger 33, the first throttle valve 32, the absorber 35 and the refrigerant circulating pump 36 are connected to form a refrigerant solution circulating loop; the first generator 30, the second condenser 31, the second throttle valve 34, the second evaporator 37, the absorber 35, the heat exchanger 33 and the refrigerant circulating pump 36 are connected to form a refrigerant vapor circulation loop; the absorption refrigeration unit and the air energy storage unit are coupled through the second evaporator 37, so that precooling of air entering the air compressor unit 10 is realized.
Specifically, a refrigerant solution circulation loop and a refrigerant steam circulation loop are provided, in the refrigerant solution circulation loop in the energy storage stage, the refrigerant solution is heated in the first generator 30 to generate hot refrigerant concentrated solution, the refrigerant concentrated solution flows through the heat exchanger 33 to be cooled, the cooled refrigerant concentrated solution flows through the first throttling valve 32 to enter the absorber 35, the refrigerant concentrated solution and the refrigerant steam form refrigerant dilute solution in the absorber 35, and the refrigerant dilute solution is sent into the first generator 30 through the refrigerant circulation pump 36.
Further, in the refrigerant vapor circulation loop in the energy storage stage, the refrigerant solution is heated and evaporated in the first generator 30 to form refrigerant vapor, the refrigerant vapor flows through the second condenser 31 to form liquid refrigerant, the liquid refrigerant flows through the second throttle valve 34 to enter the second evaporator 37, the liquid refrigerant exchanges heat with the air at normal temperature and pressure in the second evaporator 37 to form refrigerant vapor, and the refrigerant vapor after heat exchange enters the absorber 35.
In some embodiments, the absorption refrigeration unit utilizes any one or a combination of valley electricity, solar energy and industrial waste heat to realize the preparation of the circulation loop.
Particularly, any one or combination of several of low ebb electricity, solar energy and industrial waste heat is converted into heat energy to be used as a heat source of absorption refrigeration, and the heat energy drives an absorption refrigeration cycle to pre-cool air at the inlet of the air compressor unit 10, so that the compression power consumption can be effectively reduced, and the energy utilization efficiency and the electric energy conversion efficiency of the liquid air energy storage cold and hot air combined supply system are improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (11)
1. A liquid air energy storage cold and hot gas combined supply system is characterized by comprising: the air energy storage unit comprises an energy storage passage and an energy release passage;
the energy storage passage utilizes valley electricity to compress and cool air to form liquid air for energy storage;
the energy release passage converts liquid air into compressed air and outputs the compressed air.
2. The liquid air energy storage combined cooling and heating system according to claim 1, wherein the air energy storage unit comprises: the air compressor set, the cold accumulator, the throttling element, the low-temperature storage tank, the low-temperature pump and the valve assembly;
the air compressor set, the cold accumulator, the throttling element and the low-temperature storage tank are connected to form the energy storage passage;
the cryogenic storage tank, the cryogenic pump and the valve assembly are connected to form the energy release path.
3. A liquid air energy storage combined cold and hot air supply system according to claim 2 wherein the valve assembly comprises at least two stages of pressure regulating valves for regulating the output pressure of the compressed air.
4. The combined cold and hot air supply system according to claim 2, wherein the air compressor set is connected to the valve assembly through a pipeline.
5. The liquid air energy storage cold and hot air combined supply system according to claim 4, wherein the air compressor set is in the form of any one or a combination of piston type, screw type or centrifugal type; the air compressor unit comprises one or more compressors, and the compressors are connected in series, in parallel or integrated into the air compressor unit.
6. The liquid air energy storage combined cooling and heating system according to any one of claims 2 to 5, further comprising: the compression heat utilization device is arranged between the air compressor unit and the cold accumulator;
the compression heat utilization device is connected with the compression heat refrigerating unit and the hot water supply unit to form a compression heat utilization loop, and the compression heat utilization loop is used for exchanging heat with air flowing from the air compressor unit to the cold accumulator.
7. The liquid air energy storage combined cooling and heating system according to any one of claims 2 to 5, further comprising: and the refrigerating unit is connected with the air compressor unit and comprises a precooling loop, and the precooling loop is used for precooling the air entering the energy storage passage.
8. The liquid air energy storage combined cold and hot air supply system according to claim 7, wherein the refrigerating unit is an electrically driven refrigerating unit, and the electrically driven refrigerating unit comprises a compressor, a first condenser, an expansion valve and a first evaporator which are connected to form a pre-cooling loop;
wherein the first evaporator is connected with the air compressor unit;
the electric drive refrigerating unit and the air energy storage unit are coupled through the first evaporator, so that precooling of air entering the air energy storage passage is achieved.
9. The liquid air energy storage cold-hot air combined supply system according to claim 7, wherein the refrigerating unit is an absorption refrigerating unit, and the pre-cooling circuit comprises a refrigerant solution circulating circuit and a refrigerant vapor circulating circuit;
wherein the refrigerant solution circulation circuit is used for preparing the refrigerant vapor of the refrigerant vapor circulation circuit;
the refrigerant vapor circulation loop is used for pre-cooling the air entering the energy storage passage.
10. The combined cold and hot air supply system with liquid air energy storage according to claim 9, wherein the absorption chiller unit comprises: the system comprises a first generator, a second condenser, a first throttling valve, a second evaporator, a heat exchanger, a second throttling valve, an absorber and a refrigerant circulating pump;
the first generator, the heat exchanger, the first throttling valve, the absorber and the refrigerant circulating pump are connected to form the refrigerant solution circulating loop;
the first generator, the second condenser, the second throttle valve, the second evaporator, the absorber, the heat exchanger, and the refrigerant circulation pump are connected to form the refrigerant vapor circulation circuit;
the absorption refrigeration unit and the air energy storage unit are coupled through the second evaporator, so that precooling of air entering the air compressor unit is achieved.
11. The liquid air energy storage cold and hot air combined supply system according to claim 9, wherein the absorption refrigerating unit realizes preparation of the circulation loop by using any one or a combination of valley electricity, solar energy and industrial waste heat.
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Application publication date: 20210115 |