CN114382565A - Energy storage power generation system of combined cooling heating and power - Google Patents
Energy storage power generation system of combined cooling heating and power Download PDFInfo
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- CN114382565A CN114382565A CN202210078320.3A CN202210078320A CN114382565A CN 114382565 A CN114382565 A CN 114382565A CN 202210078320 A CN202210078320 A CN 202210078320A CN 114382565 A CN114382565 A CN 114382565A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B39/00—Evaporators; Condensers
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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Abstract
The invention relates to the technical field of energy storage, and provides an energy storage power generation system for combined cooling, heating and power, which comprises: the cold and hot energy heat engine power generation loop is suitable for generating power by utilizing heat energy and cold energy; the heat pump heating system is arranged corresponding to the cold and hot energy heat engine power generation loop and is suitable for converting electric energy into heat energy and storing the heat energy; the LNG cold energy absorption loop is arranged corresponding to the cold and heat energy heat engine power generation loop and is suitable for acquiring and storing cold energy from liquid natural gas; and the cold supply system is arranged corresponding to the LNG cold energy absorption loop and is suitable for utilizing the cold energy in the LNG cold energy absorption loop to supply cold. The energy storage power generation system for combined cooling, heating and power provided by the invention is provided with the LNG cold energy absorption loop and the cooling system, the LNG cold energy absorption loop is used for acquiring and storing cold energy from the liquefied natural gas, and the acquired cold energy can be used for power generation and cooling for users, so that the recycling of high-grade cold energy in the liquefied natural gas is realized.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to an energy storage power generation system for combined cooling, heating and power generation.
Background
Cryogenic cooling at-162 ℃ is released during the conversion of Liquid Natural Gas (LNG) to Compressed Natural Gas (CNG). The cold energy of the part has higher quality and higher recovery value. LNG cold energy recovery is currently receiving more and more attention. The conventional heat pump electricity storage system converts off-peak electricity and unconsumed renewable energy into high-temperature heat energy and low-temperature cold energy for storage in the electricity storage process. The stored cold and heat energy is converted into electric energy again in the electricity discharging process to be discharged. The temperature interval of the LNG cold energy is relatively consistent with the temperature interval of the cold energy stored in the energy storage process of the heat pump electricity storage system, and how to combine the LNG cold energy with the heat pump electricity storage technology becomes a problem to be solved urgently.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is how to combine the LNG cold energy with the heat pump electricity storage technology, so as to provide an energy storage and power generation system for combined cooling, heating and power generation.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an energy storage power generation system for combined cooling, heating and power generation, comprising:
the cold and hot energy heat engine power generation loop is suitable for generating power by utilizing heat energy and cold energy;
the heat pump heating system is arranged corresponding to the cold and hot energy heat engine power generation loop and is suitable for converting electric energy into heat energy and storing the heat energy;
the LNG cold energy absorption loop is arranged corresponding to the cold and heat energy heat engine power generation loop and is suitable for acquiring and storing cold energy from liquid natural gas;
and the cold supply system is arranged corresponding to the LNG cold energy absorption loop and is suitable for utilizing the cold energy in the LNG cold energy absorption loop to supply cold.
Further, the LNG cold energy absorption loop comprises a liquid natural gas storage tank, an LNG pump, an LNG evaporator, a compressed natural gas storage tank, a cold accumulation circulating fan and a low-temperature packed bed;
a liquid outlet of the liquefied natural gas storage tank is communicated with a liquid inlet of the LNG pump, a liquid outlet of the LNG pump is communicated with a first inlet of the LNG evaporator, and a first outlet of the LNG evaporator is communicated with the compressed natural gas storage tank;
the second outlet of the LNG evaporator is communicated with the first inlet of the low-temperature packed bed, the first outlet of the low-temperature packed bed is communicated with the inlet of the cold accumulation circulating fan, and the outlet of the cold accumulation circulating fan is communicated with the second inlet of the LNG evaporator.
Further, the cooling system comprises a cooling circulating fan and a cooling heat exchanger;
a first outlet of the LNG evaporator is communicated with a first inlet of the cooling heat exchanger, and a first outlet of the cooling heat exchanger is communicated with an inlet of the compressed natural gas storage tank;
the inlet of the cooling circulating fan is communicated with the outside, the outlet of the cooling circulating fan is communicated with the second inlet of the cooling heat exchanger, and the second outlet of the cooling heat exchanger is suitable for being communicated with cooling equipment of a user.
Further, the cold-heat energy heat engine power generation loop comprises an energy release compressor unit, a high-temperature packed bed, an energy release expansion unit, a power generation unit and the low-temperature packed bed;
the second outlet of the low-temperature packed bed is communicated with the inlet of the energy release compressor unit, the outlet of the energy release compressor unit is communicated with the first inlet of the high-temperature packed bed, the first outlet of the high-temperature packed bed is communicated with the inlet of the energy release expansion unit, the outlet of the energy release expansion unit is communicated with the second inlet of the low-temperature packed bed, and the power generation unit and the energy release expansion unit are arranged correspondingly.
Furthermore, the heat pump heating system comprises a driving unit, a heating loop compressor unit, a first heating loop expander, a first cold energy heat dissipation heat exchanger, a second heating loop expander, a second cold energy heat dissipation heat exchanger, a third heating loop expander, a third cold energy heat dissipation heat exchanger and a heat storage heat exchanger;
the driving unit is arranged corresponding to the heating loop compressor unit, the outlet of the heating loop compressor unit is communicated with the second inlet of the high-temperature packed bed, and the second outlet of the high-temperature packed bed is communicated with the inlet of the first-stage heating loop expander;
the outlet of the first-stage heating loop expander is communicated with the first inlet of the first-stage cold energy heat dissipation heat exchanger, the first outlet of the first-stage cold energy heat dissipation heat exchanger is communicated with the inlet of the second-stage heating loop expander, the outlet of the second-stage heating loop expander is communicated with the first inlet of the second-stage cold energy heat dissipation heat exchanger, the first outlet of the second-stage cold energy heat dissipation heat exchanger is communicated with the inlet of the third-stage refrigerating loop expander, the outlet of the third-stage refrigerating loop expander is communicated with the first inlet of the third-stage cold energy heat dissipation heat exchanger, and the first outlet of the third-stage cold energy heat dissipation heat exchanger is communicated with the inlet of the heating loop compressor unit.
Furthermore, the energy storage power generation system for combined cooling, heating and power also comprises a heat storage loop, wherein the heat storage loop comprises a heat storage heat exchanger, a heat storage circulating fan and a high-temperature packed bed;
an outlet of the heating loop compressor unit is communicated with a first inlet of the heat storage heat exchanger, and a first outlet of the heat storage heat exchanger is communicated with an inlet of the first-stage heating loop expander;
and a second outlet of the heat storage heat exchanger is communicated with a second inlet of the high-temperature packed bed, a second outlet of the high-temperature packed bed is communicated with an inlet of the heat storage circulating fan, and an outlet of the heat storage circulating fan is communicated with a second inlet of the heat storage heat exchanger.
Furthermore, the energy storage power generation system for combined cooling, heating and power also comprises a heat supply system, wherein the heat supply system comprises a heat supply circulating fan, a three-way valve A, a three-way valve B, a heat supply heat exchanger and a water supply pump;
the three-way valve A is arranged on a pipeline between the high-temperature packed bed and the heat storage circulating fan, the outlet of the heat supply circulating fan is communicated with the three-way valve A, and the inlet of the heat supply circulating fan is communicated with the first outlet of the heat supply heat exchanger;
the three-way valve B is arranged on a pipeline between a second inlet of the high-temperature packed bed and a second outlet of the heat storage heat exchanger, and a first inlet of the heat supply heat exchanger is communicated with the three-way valve B;
the second outlet of the heat supply heat exchanger is suitable for being communicated with the inlet of the heat supply equipment of the user, the second inlet of the heat supply heat exchanger is communicated with the outlet of the water supply pump, and the inlet of the water supply pump is suitable for being communicated with the outlet of the heat supply equipment of the user.
Furthermore, the energy storage power generation system for combined cooling, heating and power generation also comprises a cold accumulation system, wherein the cold accumulation system comprises a primary cold energy discharging and dissipating heat exchanger, a secondary cold energy discharging and dissipating heat exchanger, a tertiary cold energy discharging and dissipating heat exchanger, a cold accumulation circulating fan, a low-temperature packed bed and an LNG evaporator;
the second inlet of the first stage cold energy dissipation heat exchanger, the second inlet of the second stage cold energy dissipation heat exchanger and the second inlet of the third stage cold energy dissipation heat exchanger are communicated with the first outlet of the low-temperature packed bed;
the second outlet of the first-stage cold energy dissipation heat exchanger, the second outlet of the second-stage cold energy dissipation heat exchanger and the second outlet of the third-stage cold energy dissipation heat exchanger are communicated with the second inlet of the LNG evaporator;
the cold accumulation circulating fan is arranged on a pipeline between the first-stage cold energy heat dissipation heat exchanger and the low-temperature packed bed.
Further, the gas working medium in the energy storage and power generation system for combined cooling, heating and power generation comprises one or more of argon, air, nitrogen and helium.
Further, the solid particle cold storage material in the low-temperature packed bed comprises one or more of rock, sand, metal particles and solid brick material;
the solid particulate heat storage material in the high temperature packed bed comprises one or more of rock, sand, metal particles and solid brick material.
The technical scheme of the invention has the following advantages:
the energy storage power generation system for combined cooling, heating and power provided by the invention is provided with the LNG cold energy absorption loop and the cooling system, the LNG cold energy absorption loop is used for acquiring and storing cold energy from the liquefied natural gas, and the acquired cold energy can be used for power generation and cooling for users, so that the recycling of high-grade cold energy in the liquefied natural gas is realized.
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 other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of the overall structure of an energy storage power generation system for combined cooling, heating and power generation in an embodiment of the invention;
fig. 2 is an enlarged view of a portion of the structure of fig. 1.
Description of reference numerals:
1. a drive unit; 2. A heating loop compressor unit;
3. a first stage heating circuit expander; 4. A second heating loop expander;
5. a third stage heating loop expander; 6. A heat storage heat exchanger;
7. a first stage cold energy heat exchanger; 8. A second stage cold energy heat exchanger;
9. a third stage cold energy heat exchanger; 10. A heat storage circulating fan;
11. a high temperature packed bed; 12. A liquefied natural gas storage tank;
13. an LNG pump; 14. An LNG vaporizer;
15. a compressed natural gas storage tank; 16. A cold accumulation circulating fan;
17. a low temperature packed bed; 18. An energy release compressor unit;
19. an energy releasing expansion unit; 20. A power generation unit;
21. a cooling circulation fan; 22. A cooling heat exchanger;
23. a flow regulating valve A; 24. A flow regulating valve B;
25. a flow regulating valve C; 26. A heat supply circulating fan;
27. a three-way valve A; 28. A three-way valve B;
29. a feed pump; 30. A heat supply heat exchanger;
31. a first passage of the three-way valve A; 32. A second passage of the three-way valve A;
33. a third passage of the three-way valve A; 34. A first passage of the three-way valve B;
35. a second passage of the three-way valve B; 36. And a third passage of the three-way valve B.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting 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.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic view of the overall structure of an energy storage power generation system for combined cooling, heating and power generation in an embodiment of the invention; as shown in fig. 1, the present embodiment provides an energy storage power generation system for combined cooling, heating and power generation, including: the cold and hot energy heat engine power generation loop generates power by utilizing the stored heat energy and cold energy; the heat pump heating system is arranged corresponding to the cold and hot energy heat engine power generation loop and can convert electric energy into heat energy and store the heat energy in the electricity utilization valley period; the LNG cold energy absorption loop is arranged corresponding to the cold and heat energy heat engine power generation loop and is suitable for acquiring and storing cold energy from the liquid natural gas; and the cold supply system is arranged corresponding to the LNG cold energy absorption loop and is suitable for supplying cold by utilizing the cold energy in the LNG cold energy absorption loop.
The energy storage power generation system of combined cooling heating and power that provides in this embodiment is provided with LNG cold energy absorption return circuit and cooling system, utilizes LNG cold energy absorption return circuit to obtain cold energy and store from liquefied natural gas, and the cold energy that obtains not only can be used to generate electricity, but also can be used to for the user cooling, has realized the recycle of high-grade cold energy in the liquefied natural gas.
The LNG cold energy absorption loop comprises a liquid natural gas storage tank 12, an LNG pump 13, an LNG evaporator 14, a compressed natural gas storage tank 15, a cold accumulation circulating fan 16 and a low-temperature packed bed 17; a liquid outlet of the liquefied natural gas storage tank 12 is communicated with a liquid inlet of an LNG pump 13, a liquid outlet of the LNG pump 13 is communicated with a first inlet of an LNG evaporator 14, and a first outlet of the LNG evaporator 14 is communicated with a compressed natural gas storage tank 15; the second outlet of the LNG evaporator 14 is communicated with the first inlet of the low-temperature packed bed 17, the first outlet of the low-temperature packed bed 17 is communicated with the inlet of the cold accumulation circulating fan 16, and the outlet of the cold accumulation circulating fan 16 is communicated with the second inlet of the LNG evaporator 14.
Wherein, the cooling system comprises a cooling circulating fan 21 and a cooling heat exchanger 22; a first outlet of the LNG evaporator 14 is communicated with a first inlet of a cooling heat exchanger 22, and a first outlet of the cooling heat exchanger 22 is communicated with an inlet of a compressed natural gas storage tank 15; the inlet of the cooling circulation fan 21 is communicated with the outside, the outlet of the cooling circulation fan 21 is communicated with the second inlet of the cooling heat exchanger 22, and the second outlet of the cooling heat exchanger 22 is suitable for being communicated with cooling equipment of a user.
The cold and heat energy heat engine power generation loop comprises an energy release compressor unit 18, a high-temperature packed bed 11, an energy release expander unit 19, a power generation unit 20 and a low-temperature packed bed 17; wherein, the second outlet of the low-temperature packed bed 17 is communicated with the inlet of the energy release compressor unit 18, the outlet of the energy release compressor unit 18 is communicated with the first inlet of the high-temperature packed bed 11, the first outlet of the high-temperature packed bed 11 is communicated with the inlet of the energy release expansion unit 19, the outlet of the energy release expansion unit 19 is communicated with the second inlet of the low-temperature packed bed 17, and the power generation unit 20 is arranged corresponding to the energy release expansion unit 19.
The heat pump heating system comprises a driving unit 1, a heating loop compressor unit 2, a first heating loop expander 3, a first cold energy heat dissipation heat exchanger 7, a second heating loop expander 4, a second cold energy heat dissipation heat exchanger 8, a third heating loop expander 5, a third cold energy heat dissipation heat exchanger 9 and a heat storage heat exchanger 6; the driving unit 1 is arranged corresponding to the heating loop compressor unit 2, the outlet of the heating loop compressor unit 2 is communicated with the second inlet of the high-temperature packed bed 11, and the second outlet of the high-temperature packed bed 11 is communicated with the inlet of the first-stage heating loop expander 3; the outlet of the first heating loop expander 3 is communicated with the first inlet of the first cooling energy heat dissipation heat exchanger 7, the first outlet of the first cooling energy heat dissipation heat exchanger 7 is communicated with the inlet of the second heating loop expander 4, the outlet of the second heating loop expander 4 is communicated with the first inlet of the second cooling energy heat dissipation heat exchanger 8, the first outlet of the second cooling energy heat dissipation heat exchanger 8 is communicated with the inlet of the third heating loop expander 5, the outlet of the third heating loop expander 5 is communicated with the first inlet of the third cooling energy heat dissipation heat exchanger 9, and the first outlet of the third cooling energy heat dissipation heat exchanger 9 is communicated with the inlet of the heating loop compressor unit 2.
The energy storage power generation system for combined cooling, heating and power further comprises a heat storage loop, wherein the heat storage loop comprises a heat storage heat exchanger 6, a heat storage circulating fan 10 and a high-temperature packed bed 11; an outlet of the heating loop compressor unit 2 is communicated with a first inlet of a heat storage heat exchanger 6, and a first outlet of the heat storage heat exchanger 6 is communicated with an inlet of the first-stage heating loop expander 3; the second outlet of the heat storage heat exchanger 6 is communicated with the second inlet of the high-temperature packed bed 11, the second outlet of the high-temperature packed bed 11 is communicated with the inlet of the heat storage circulating fan 10, and the outlet of the heat storage circulating fan 10 is communicated with the second inlet of the heat storage heat exchanger 6.
The energy storage power generation system for combined cooling, heating and power further comprises a heat supply system, wherein the heat supply system comprises a heat supply circulating fan 26, a three-way valve A27, a three-way valve B28, a heat supply heat exchanger 30 and a water supply pump 29; the three-way valve A27 is arranged on a pipeline between the high-temperature packed bed 11 and the heat storage circulating fan 10, the outlet of the heat supply circulating fan 26 is communicated with the three-way valve A27, and the inlet of the heat supply circulating fan 26 is communicated with the first outlet of the heat supply heat exchanger 30; the three-way valve B28 is arranged on a pipeline between the second inlet of the high-temperature packed bed 11 and the second outlet of the heat storage heat exchanger 6, and the first inlet of the heat supply heat exchanger 30 is communicated with the three-way valve B28; the second outlet of the heat supply heat exchanger 30 is adapted to communicate with the inlet of the user's heating equipment, the second inlet of the heat supply heat exchanger 30 communicates with the outlet of the feed pump 29, and the inlet of the feed pump 29 is adapted to communicate with the outlet of the user's heating equipment.
The energy storage power generation system for combined cooling, heating and power further comprises a cold accumulation system, wherein the cold accumulation system comprises a primary cold energy discharging and dissipating heat exchanger 7, a secondary cold energy discharging and dissipating heat exchanger 8, a tertiary cold energy discharging and dissipating heat exchanger 9, a cold accumulation circulating fan 16, a low-temperature packed bed 17 and an LNG evaporator 14; a second inlet of the first-stage cold energy dissipation heat exchanger 7, a second inlet of the second-stage cold energy dissipation heat exchanger 8 and a second inlet of the third-stage cold energy dissipation heat exchanger 9 are communicated with a first outlet of the high-temperature packed bed 11; a second outlet of the first-stage cold energy discharging and dissipating heat exchanger 7, a second outlet of the second-stage cold energy discharging and dissipating heat exchanger 8 and a second outlet of the third-stage cold energy discharging and dissipating heat exchanger 9 are communicated with a second inlet of the LNG evaporator 14; the cold accumulation circulating fan 16 is arranged on a pipeline between the first-stage cold energy discharge heat exchanger 7 and the low-temperature packed bed 17.
Wherein, a flow regulating valve a can be arranged on the pipeline between the cold accumulation circulating fan 16 and the high temperature packed bed 11, a flow regulating valve B is arranged on the pipeline between the cold accumulation circulating fan 16 and the third stage cold energy discharging heat exchanger 9, a flow regulating valve C is arranged on the pipeline between the cold accumulation circulating fan 16 and the second stage cold energy discharging heat exchanger 8, and the flow in the first stage cold energy discharging heat exchanger 7, the second stage cold energy discharging heat exchanger 8 and the third stage cold energy discharging heat exchanger 9 can be regulated and distributed in real time by controlling the flow regulating valve a, the flow regulating valve B and the flow regulating valve C.
The gas working medium in the energy storage power generation system for combined cooling, heating and power generation comprises one or more of argon, air, nitrogen and helium.
Wherein, the solid particle cold storage material in the low-temperature packed bed 17 comprises one or more of rock, sand, metal particles and solid brick material; the solid particulate heat storage material in the high temperature packed bed 11 comprises one or more of rock, sand, metal particles and solid brick material.
The working process of the energy storage power generation system for combined cooling, heating and power generation is as follows:
in the energy storage process, the electric energy is converted into heat energy through the heat pump heating system and is stored. The driving unit 1 is in driving connection with the heating loop compressor unit 2. The driving unit 1 consumes electric energy to drive the heating loop compressor unit 2, and compresses the gas working medium at normal temperature and normal pressure to a high-temperature and high-pressure state. The high-temperature high-pressure gas working medium flows through the heat storage heat exchanger 6 to release heat energy to a normal-temperature high-pressure state. The gas working medium with normal temperature and high pressure sequentially enters a first-stage heating loop expansion machine 3, a second-stage heating loop expansion machine 4 and a third-stage heating loop expansion machine 5 to be expanded to a low-temperature normal-pressure state. A cold energy heat emission heat exchanger is connected behind each stage of heating loop multistage expander, a normal temperature gas working medium is expanded by each stage of heating loop expander to a low temperature state, and then the low temperature gas working medium enters the cold energy heat emission heat exchanger to transfer cold energy to a flowing working medium of a cold accumulation system. And then the normal-temperature gas working medium continuously flows into the next-stage heating loop expansion machine for expansion. The gas working medium flowing out of the last stage cold energy dissipation heat exchanger returns to the normal temperature and normal pressure state again, and flows into the heating loop compressor unit 2 again for compression and heating. The electric energy is continuously converted into high-temperature heat energy by the repeated circulation.
FIG. 2 is an enlarged view of a portion of the structure of FIG. 1, as shown in FIG. 2, and at the same time, the first path of the three-way valve A and the second path of the three-way valve A are connected, and the third path of the three-way valve A is closed; and the first passage of the three-way valve B and the third passage of the three-way valve B are connected, and the second passage of the three-way valve B is cut off. The heat accumulation circulating fan 10 is started to drive the gas working medium in the heat accumulation loop to flow into the heat accumulation heat exchanger 6 to absorb heat energy to a high-temperature state. The high-temperature gas working medium flows into the high-temperature packed bed 11 through the third passage of the three-way valve B, the first passage of the three-way valve B and the pipeline, exchanges heat with the solid particle heat storage material therein, and stores heat energy therein. The normal temperature gas working medium flowing out of the high temperature packed bed 11 flows to the inlet of the heat storage circulating fan 10 through the second passage of the three-way valve a, the first passage of the three-way valve a and the pipeline, and is driven by the heat storage circulating fan 10 to reenter the heat storage heat exchanger 6 to absorb heat energy.
In the energy storage process, cold energy is absorbed from the liquefied natural gas through the LNG cold energy absorption system and stored. The cryogenic liquefied natural gas flows out of the liquefied natural gas storage tank 12 through the driving of the LNG pump 13, enters the LNG vaporizer 14 to release cold energy, absorbs heat in the LNG vaporizer 14, is vaporized to a compressed natural gas state (CNG), and flows into the compressed natural gas storage tank 15 along a pipeline to be stored.
The heat pump heating system generates a part of cooling energy while heating, and in the present application, the part of cooling energy is recovered, stored, and utilized. The cold accumulation circulating fan 16 is started to drive the flowing working medium in the cold accumulation system to uniformly or non-uniformly flow into the first-stage cold energy discharging and dissipating heat exchanger 7, the second-stage cold energy discharging and dissipating heat exchanger 8 and the third-stage cold energy discharging and dissipating heat exchanger 9 to absorb cold energy and then gather, the flowing working medium flows into the LNG evaporator 14 to further absorb high-grade cold energy, and the low-temperature flowing working medium flows into the low-temperature packed bed 17 to store the cold energy in the solid particle cold accumulation material. Due to the unsteady state of the system, a flow regulating valve A, a flow regulating valve B and a flow regulating valve C are arranged to regulate and distribute flow in real time.
The natural gas exiting the LNG vaporizer 14 still carries some cold energy, which is further recycled for use at the customer side when there is a demand for cooling. The cooling circulating fan 21 of the cooling system is started to drive the flowing working medium to flow into the cooling heat exchanger 22 to absorb residual cooling, and then the gas working medium carrying the cold energy is conveyed to the user side along the pipeline to release the cold energy.
When the system is in the peak period of power utilization, the system releases power outwards.
The high-grade heat energy and cold energy stored in the energy storage stage are converted into kinetic energy through heat engine circulation, and then converted into electric energy through the power generation unit 20 to be released.
The gas working medium in the cold and heat energy heat engine power generation loop flows into the low-temperature packed bed 17 to absorb the cold energy therein to be in a low-temperature normal-pressure state, and the gas working medium in the low-temperature normal-pressure state enters the energy release compressor unit 18 to be compressed to be in a normal-temperature, medium/high-pressure state. The gas working medium with normal temperature and medium/high pressure flows through the high temperature packed bed 11 to absorb the high temperature heat energy therein to a high temperature and medium/high pressure state, and then flows into the energy release expansion unit 19 to expand and do work. The energy release expansion unit 19 is in transmission connection with the energy release compressor unit 18, and the energy release expansion unit 19 is in driving connection with the power generation unit 20. The energy-releasing expansion unit 19 drives the power generation unit 20 to generate power. The expanded gas at normal temperature and normal pressure enters the low-temperature packed bed 17 again to absorb cold energy. The cold and heat energy is converted into electric energy continuously and released in such a circulating way.
When the heat demand is available, the heat energy in the system is transferred to the user side through the heat supply system, and the heat supply demand is met.
Because the heat pump electricity storage system stores energy in the form of cold and hot energy, the electricity, the cold and the hot energy can be flexibly converted and released. When the user side has a heating demand, the system in the application can provide heat energy. A heating system is arranged to realize the functions, and the heating system is divided into a system side and a user side.
At the moment, the second passage 32 of the three-way valve A is communicated with the third passage 33 of the three-way valve A, and the first passage 31 of the three-way valve A is cut off; the first passage 34 of the control three-way valve B is communicated with the second passage 35 of the three-way valve B, and the third passage 36 of the three-way valve B is cut off.
On the system side of the heating system, the heating circulating fan 26 is started to drive the gas working medium to flow into the high-temperature packed bed 11 through the third passage 33 of the three-way valve A, the second passage 32 of the three-way valve A and the pipeline to absorb heat energy, and then flow into the heating heat exchanger 30 through the first passage 34 of the three-way valve B and the second passage 35 of the three-way valve B to release heat energy.
On the user side of the heating system, the feed pump 29 is activated to drive the liquid water working medium to flow into the heat supply heat exchanger 30 to absorb heat energy, and then to the user side to release the heat energy.
Selecting a working medium:
the gas working medium in the system side of the heat pump heating system, the heat storage loop, the cold storage loop and the heat supply system and the cold and heat energy heat engine power generation loop can be one or more of argon, air, nitrogen and helium. The flowing working media of the system side of the heat supply system, the heat storage loop, the cold storage system and the cold and heat energy heat engine power generation loop need to be the same. The flowing working medium of the heat pump heating system can be the same as or different from the flowing working medium of the system.
The flowing working medium in the LNG cold energy absorption loop is natural gas.
The flowing working medium in the cooling system is air.
The flowing working medium at the user side of the heat supply system is water.
A power plant:
the driving unit is a driving motor or an electric machine. When the driving unit is a driving motor, one or more of conventional power station valley electricity, nuclear electricity, wind electricity, solar power generation, hydroelectric power generation or tidal power generation are used as a power supply.
The total pressure ratio of a heating loop compressor unit in the heat pump heating system to an energy releasing compressor unit in a cold-heat energy heat engine power generation loop is 3-20. When the energy-releasing compressor unit is a plurality of compressors, the plurality of compressors are in a coaxial series connection mode or a split-shaft parallel connection mode. In the parallel connection mode, each branch shaft is movably connected with the main driving shaft; the total expansion ratio of a heating loop expansion unit in a heat pump heating system and an energy release expansion unit in a cold and heat energy heat engine power generation loop is between 3 and 20; when the energy-releasing expansion unit is a plurality of expansion machines, the plurality of expansion machines are in a coaxial series connection mode or a split-shaft parallel connection mode; in the parallel connection mode, each branch shaft is movably connected with the main driving shaft.
Note that: in the heat pump heating system, the pressure ratio of the heating loop compressor unit is n times of the expansion ratio of each heating loop expansion unit (n is the number of stages of the energy-releasing expansion unit of the heating loop, 3 stages of expansion machines are drawn in fig. 1, and actually 2, 3, 4, 5 and 6 stages can be realized).
A storage device:
the high-temperature packed bed and the low-temperature packed bed are cylinders, spheres or cuboids, and the solid cold and heat storage material can be one or a combination of more of rock, sand, metal particles, solid bricks and the like.
In conclusion, the heat pump electricity storage method utilizing the liquid natural gas cold energy provided by the invention provides a new idea of LNG cold energy recovery, and the LNG cold energy and the heat pump electricity storage system are innovatively combined to realize the recovery and utilization of high-grade cold energy.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. An energy storage power generation system for combined cooling, heating and power generation, comprising:
the cold and hot energy heat engine power generation loop is suitable for generating power by utilizing heat energy and cold energy;
the heat pump heating system is arranged corresponding to the cold and hot energy heat engine power generation loop and is suitable for converting electric energy into heat energy and storing the heat energy;
the LNG cold energy absorption loop is arranged corresponding to the cold and heat energy heat engine power generation loop and is suitable for acquiring and storing cold energy from liquid natural gas;
and the cold supply system is arranged corresponding to the LNG cold energy absorption loop and is suitable for utilizing the cold energy in the LNG cold energy absorption loop to supply cold.
2. A combined cooling, heating and power energy storage and power generation system according to claim 1,
the LNG cold energy absorption loop comprises a liquid natural gas storage tank, an LNG pump, an LNG evaporator, a compressed natural gas storage tank, a cold accumulation circulating fan and a low-temperature packed bed;
a liquid outlet of the liquefied natural gas storage tank is communicated with a liquid inlet of the LNG pump, a liquid outlet of the LNG pump is communicated with a first inlet of the LNG evaporator, and a first outlet of the LNG evaporator is communicated with the compressed natural gas storage tank;
the second outlet of the LNG evaporator is communicated with the first inlet of the low-temperature packed bed, the first outlet of the low-temperature packed bed is communicated with the inlet of the cold accumulation circulating fan, and the outlet of the cold accumulation circulating fan is communicated with the second inlet of the LNG evaporator.
3. A combined cooling, heating and power energy storage and power generation system according to claim 2,
the cold supply system comprises a cold supply circulating fan and a cold supply heat exchanger;
a first outlet of the LNG evaporator is communicated with a first inlet of the cooling heat exchanger, and a first outlet of the cooling heat exchanger is communicated with an inlet of the compressed natural gas storage tank;
the inlet of the cooling circulating fan is communicated with the outside, the outlet of the cooling circulating fan is communicated with the second inlet of the cooling heat exchanger, and the second outlet of the cooling heat exchanger is suitable for being communicated with cooling equipment of a user.
4. A combined cooling, heating and power energy storage and power generation system according to claim 2,
the cold and heat energy heat engine power generation loop comprises an energy release compressor unit, a high-temperature packed bed, an energy release expansion unit, a power generation unit and the low-temperature packed bed;
the second outlet of the low-temperature packed bed is communicated with the inlet of the energy release compressor unit, the outlet of the energy release compressor unit is communicated with the first inlet of the high-temperature packed bed, the first outlet of the high-temperature packed bed is communicated with the inlet of the energy release expansion unit, the outlet of the energy release expansion unit is communicated with the second inlet of the low-temperature packed bed, and the power generation unit and the energy release expansion unit are arranged correspondingly.
5. A combined cooling, heating and power energy storage and power generation system according to claim 4,
the heat pump heating system comprises a driving unit, a heating loop compressor unit, a first heating loop expander, a first cold energy heat dissipation heat exchanger, a second heating loop expander, a second cold energy heat dissipation heat exchanger, a third heating loop expander, a third cold energy heat dissipation heat exchanger and a heat storage heat exchanger;
the driving unit is arranged corresponding to the heating loop compressor unit, the outlet of the heating loop compressor unit is communicated with the second inlet of the high-temperature packed bed, and the second outlet of the high-temperature packed bed is communicated with the inlet of the first-stage heating loop expander;
the outlet of the first-stage heating loop expander is communicated with the first inlet of the first-stage cold energy heat dissipation heat exchanger, the first outlet of the first-stage cold energy heat dissipation heat exchanger is communicated with the inlet of the second-stage heating loop expander, the outlet of the second-stage heating loop expander is communicated with the first inlet of the second-stage cold energy heat dissipation heat exchanger, the first outlet of the second-stage cold energy heat dissipation heat exchanger is communicated with the inlet of the third-stage refrigerating loop expander, the outlet of the third-stage refrigerating loop expander is communicated with the first inlet of the third-stage cold energy heat dissipation heat exchanger, and the first outlet of the third-stage cold energy heat dissipation heat exchanger is communicated with the inlet of the heating loop compressor unit.
6. A combined cooling, heating and power energy storage and power generation system according to claim 5,
the system also comprises a heat storage loop, a heat storage heat exchanger, a heat storage circulating fan and a high-temperature packed bed;
an outlet of the heating loop compressor unit is communicated with a first inlet of the heat storage heat exchanger, and a first outlet of the heat storage heat exchanger is communicated with an inlet of the first-stage heating loop expander;
and a second outlet of the heat storage heat exchanger is communicated with a second inlet of the high-temperature packed bed, a second outlet of the high-temperature packed bed is communicated with an inlet of the heat storage circulating fan, and an outlet of the heat storage circulating fan is communicated with a second inlet of the heat storage heat exchanger.
7. A combined cooling, heating and power energy storage and power generation system according to claim 6,
the system also comprises a heat supply system, a heat supply circulating fan, a three-way valve A, a three-way valve B, a heat supply heat exchanger and a water supply pump;
the three-way valve A is arranged on a pipeline between the high-temperature packed bed and the heat storage circulating fan, the outlet of the heat supply circulating fan is communicated with the three-way valve A, and the inlet of the heat supply circulating fan is communicated with the first outlet of the heat supply heat exchanger;
the three-way valve B is arranged on a pipeline between a second inlet of the high-temperature packed bed and a second outlet of the heat storage heat exchanger, and a first inlet of the heat supply heat exchanger is communicated with the three-way valve B;
the second outlet of the heat supply heat exchanger is suitable for being communicated with the inlet of the heat supply equipment of the user, the second inlet of the heat supply heat exchanger is communicated with the outlet of the water supply pump, and the inlet of the water supply pump is suitable for being communicated with the outlet of the heat supply equipment of the user.
8. A combined cooling, heating and power energy storage and power generation system according to claim 5,
the cold accumulation system comprises a first-stage cold energy discharging and dissipating heat exchanger, a second-stage cold energy discharging and dissipating heat exchanger, a third-stage cold energy discharging and dissipating heat exchanger, a cold accumulation circulating fan, a low-temperature packed bed and an LNG evaporator;
the second inlet of the first stage cold energy dissipation heat exchanger, the second inlet of the second stage cold energy dissipation heat exchanger and the second inlet of the third stage cold energy dissipation heat exchanger are communicated with the first outlet of the low-temperature packed bed;
the second outlet of the first-stage cold energy dissipation heat exchanger, the second outlet of the second-stage cold energy dissipation heat exchanger and the second outlet of the third-stage cold energy dissipation heat exchanger are communicated with the second inlet of the LNG evaporator;
the cold accumulation circulating fan is arranged on a pipeline between the first-stage cold energy heat dissipation heat exchanger and the low-temperature packed bed.
9. A combined cooling, heating and power energy storage and power generation system according to any one of claims 1 to 8,
the gas working medium in the energy storage power generation system for combined cooling, heating and power generation comprises one or more of argon, air, nitrogen and helium.
10. A combined cooling, heating and power energy storage and power generation system according to any one of claims 2 to 8,
the solid particle cold storage material in the low-temperature packed bed comprises one or more of rock, sand and stone, metal particles and solid brick materials;
the solid particulate heat storage material in the high temperature packed bed comprises one or more of rock, sand, metal particles and solid brick material.
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| CN117220305A (en) * | 2023-08-31 | 2023-12-12 | 中海石油气电集团有限责任公司 | Efficient energy storage power generation peak shaving system based on LNG cold energy recovery |
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| CN117220305B (en) * | 2023-08-31 | 2024-05-17 | 中海石油气电集团有限责任公司 | Efficient energy storage power generation peak shaving system based on LNG cold energy recovery |
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