CN115388695B - Heat storage and energy storage system with zero waste heat cold-hot-electricity exchange function - Google Patents
Heat storage and energy storage system with zero waste heat cold-hot-electricity exchange function Download PDFInfo
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- CN115388695B CN115388695B CN202211138979.XA CN202211138979A CN115388695B CN 115388695 B CN115388695 B CN 115388695B CN 202211138979 A CN202211138979 A CN 202211138979A CN 115388695 B CN115388695 B CN 115388695B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
- F04D25/045—Units comprising pumps and their driving means the pump being fluid-driven the pump wheel carrying the fluid driving means, e.g. turbine blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D2020/0065—Details, e.g. particular heat storage tanks, auxiliary members within tanks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The invention belongs to the technical field of thermoelectric energy storage, and particularly relates to a heat storage energy storage system with zero waste heat cold-hot-electricity exchange, which comprises a cold storage system, a heat storage system, a turbine-compression integrated machine, an electric-power generation integrated machine, an auxiliary compressor and an isenthalpic expansion valve. The system solves the problems of conversion efficiency reduction caused by waste heat discharge by adopting the isenthalpic expansion valve technology, solves the problems of low efficiency and low energy density caused by adopting air as a working medium in the prior art by adopting a supercritical carbon dioxide system and a Joule-Thomson effect as working media, and realizes a zero waste heat cold-heat-electricity exchange heat storage system adopting the same equipment to perform forward operation power generation and reverse operation energy storage.
Description
Technical Field
The invention belongs to the technical field of thermoelectric energy storage, and particularly relates to a heat storage energy storage system with zero waste heat cold-hot-electricity exchange.
Background
Along with the economic development and environmental protection requirements, renewable energy sources are rapidly developed, and the renewable energy sources have intermittent characteristics, so that the renewable energy sources are easy to cause instability of a power system when generating electricity. The energy storage technology solves the stability problem of the power grid through the mode of storing the electric energy in excess and releasing the electric energy in the absence, and greatly improves the energy utilization rate and the power grid safety. Therefore, large-scale energy storage is an indispensable guarantee for large-scale development of renewable energy sources. In the traditional mode, when heat energy is converted into electric energy, after the working medium flows out of the turbine, heat dissipation is needed through natural environment, waste heat emission and energy loss are formed, and energy storage efficiency is affected by environmental temperature.
To date, large-scale commercial energy storage technologies mainly include pumped storage, compressed air storage and heat storage technologies. The pumped storage needs a large water storage area with a height difference, has strong dependence on the geographic environment and is difficult to popularize. Because the energy density of the compressed air is low, a large number of storage tanks or mine rock pits are needed for storing the compressed air, the occupied area is large, and the use conditions are harsh. The heat storage technology, including cold-hot-electric exchange technology, has the advantages of high energy density, no need of occupying a large amount of land, and wide application field. However, the existing heat storage technology adopts a heat pump cycle to store energy, an air brayton cycle or a steam Rankine cycle to generate electricity, waste heat is discharged in the cycle process, and the heat-electricity conversion efficiency is low. Meanwhile, the existing design of the mode generally needs an electric-thermal heat storage system and a thermal-electric power generation system, and is complex in system, high in cost and not beneficial to large-scale popularization and use.
For example, the invention patent with publication number CN114857973a discloses a thermoelectric conversion energy storage system based on cold storage and heat storage technology, and energy exchange between the environment and the system is utilized by combining a multi-stage heat storage and release technology and a regenerative technology, so that the energy storage efficiency of the thermoelectric energy storage system is improved, but the problems that the equipment is more, the occupied area is large, waste heat needs to be discharged to the environment, and the heat energy cannot be utilized to the greatest extent are caused. In addition, the patent of the invention of the energy storage device and method based on carbon dioxide gas-liquid phase transition, which is disclosed in the publication No. CN112985145A, discloses a system for compressing supercritical carbon dioxide to store redundant energy in the form of high-pressure supercritical carbon dioxide by using a compressor to compress the supercritical carbon dioxide, and release the high-pressure supercritical carbon dioxide for power generation when required, but the energy storage device is still a compressed gas energy storage mode in nature, so that the efficiency is difficult to improve, the energy stored per unit volume is lower, the occupied area is large, and the cost is higher.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a heat storage energy storage system with zero waste heat cold-hot-electric exchange, when energy is converted into electric energy, the flowing working medium is directly cooled by a cold source stored in the energy storage process without cooling through natural environment, no waste heat is released to the environment, and the aim of zero waste heat emission is fulfilled; the novel isenthalpic expansion valve is designed to realize the adjustment of the circulation parameters in a larger range, so that waste heat is not required to be discharged when heat energy is converted into electric energy, and the problem of conversion efficiency reduction caused by waste heat discharge is solved; by combining a supercritical carbon dioxide system and a Joule-Thomson effect, the problems of low efficiency and low energy density caused by the fact that air is used as a working medium in the prior art are solved, and a heat storage system with zero waste heat cold-heat-electricity exchange, which adopts the same set of equipment to perform forward operation power generation and reverse operation energy storage, is realized.
The technical scheme of the invention is as follows:
a heat storage and energy storage system with zero waste heat cold-hot-electricity exchange comprises a cold storage system, a heat storage system, a turbine-compression integrated machine, an electric-power generation integrated machine, an auxiliary compressor, a coupler and an isenthalpic expansion valve, wherein the left end of the electric-power generation integrated machine is connected with the turbine-compression integrated machine, the right end of the electric-power generation integrated machine is connected with the coupler, and the right end of the coupler is connected with the auxiliary compressor; the high-temperature high-pressure side of the turbine-compressor integrated machine is connected with the high-temperature side of a heat storage-release heat exchanger of the heat storage system through a two-way pipeline, the low-temperature low-pressure side of the turbine-compressor integrated machine is connected with the high-temperature side of a cold storage-release Leng Huanre device of the cold storage system through a two-way pipeline, the low-temperature side of the heat storage-release heat exchanger is unidirectionally communicated with the high-pressure side of a secondary compressor, and the low-pressure side of the secondary compressor is unidirectionally communicated with the low-temperature side of the cold storage-release Leng Huanre device; the cold storage-release Leng Huanre device is connected with the low pressure side of the auxiliary compressor and is communicated with the low pressure side of the isenthalpic expansion valve through a one-way pipeline, and is communicated with the high pressure side of the heat storage-release heat exchanger and the auxiliary compressor in a one-way through the high pressure side of the isenthalpic expansion valve.
Further, the heat storage system comprises a heat storage-release heat exchanger, a high-temperature heat storage tank and a low-temperature heat storage tank, wherein the high-temperature side of the heat storage-release heat exchanger is connected with the high-temperature heat storage tank through a two-way pipeline, and the low-temperature side of the heat storage-release heat exchanger is connected with the low-temperature heat storage tank through a two-way pipeline.
Further, the cold storage system comprises a cold storage-release Leng Huanre device, a low-temperature cold storage tank and a high-temperature cold storage tank, wherein the low-temperature side of the cold storage-release heat exchanger is connected with the high-temperature cold storage tank through a bidirectional pipeline, and the high-temperature side of the cold storage-release Leng Huanre device is connected with the low-temperature cold storage tank through a bidirectional pipeline.
Furthermore, the turbine-compressor integrated machine adopts the turbine-compressor integrated machine technology with adjustable stationary blades, and is used as a turbine in forward direction and used as a compressor in reverse direction through an axial flow turbine. By adjusting the angle of the stationary blade, the conversion between the turbine and the compressor is realized.
Furthermore, the turbine-compressor integrated machine changes the angle of the stationary blade and the angle of the incident airflow of the movable blade according to the pressure value fed back by the system parameters, so that the turbine-compressor integrated machine can operate in a wider pressure range and can operate under the optimal working condition.
Further, the electric-power generation integrated machine adopts a power generation-electric integrated machine technology, and is used as a generator in the forward direction and used as a motor in the reverse direction.
Further, the isenthalpic expansion valve consists of a vertical porous throttling orifice plate, a flashboard and a measuring and feedback control system, and is a throttling valve capable of automatically adjusting the opening of the flashboard according to the system state; the front end and the rear end of the valve are connected with a feedback loop, the feedback loop is connected to a flashboard inside the valve through a control motor, and the flashboard moves up and down through the control of a stepping motor to shade the orifice plate.
Further, the turbine-compressor integrated machine, the electric-power generation integrated machine and the auxiliary compressor are coaxially arranged.
Further, supercritical carbon dioxide is used as a flow medium of the system.
Furthermore, the heat storage medium of the system is molten salt, and the cold storage medium is water, organic medium or molten salt.
The invention has the beneficial effects that:
according to the zero waste heat discharge heat storage system based on the turbine compression integrated technology and the supercritical carbon dioxide circulation, provided by the invention, the effects of forward operation power generation and reverse operation energy storage can be realized through the same set of equipment, so that the energy storage system is compact and efficient.
The turbine-compressor integrated machine is used as a turbine in forward operation and used as a compressor in reverse operation through the design of the turbine with the adjustable stationary blades, and can be in an optimal operation condition; meanwhile, the integrated technology of the generator and the motor is adopted, so that the number of equipment is greatly reduced, and the structure is compact. Based on the Joule-Thomson effect, the design and the use of the isenthalpic expansion valve are innovated, so that the circulation parameters are controllable and adjustable, the purpose of zero waste heat discharge is realized, and the energy storage efficiency is improved. In addition, based on the supercritical carbon dioxide circulating system technology, the whole energy storage efficiency is effectively improved, the equipment corrosion is reduced, and meanwhile, the use of cold storage and heat storage media is reduced, so that the whole energy storage system is compact in structure and small in size.
The supercritical carbon dioxide circulation electric heating energy storage technology has the energy conversion rate exceeding 80%, the value of the supercritical carbon dioxide circulation electric heating energy storage technology is far higher than the corresponding value of the existing commercial energy storage technology, and the supercritical carbon dioxide circulation electric heating energy storage technology has the advantages of small occupied area, small volume, no limitation of geographical positions, no need of fuel, low investment cost, no safety, no environmental problem and the like, simultaneously reduces the strength of working medium corrosion equipment, prolongs the service life of the equipment, and is a large-scale long-time energy storage technology with great prospect.
Drawings
FIG. 1 is a schematic diagram of a thermal storage energy storage system with zero waste heat and cold-hot-electricity exchange according to the present invention;
FIG. 2 is a schematic diagram of a thermal storage energy storage system with zero waste heat and cold-hot-electricity exchange according to the present invention in a released state;
FIG. 3 is a schematic diagram of a thermal storage energy storage system with zero waste heat and cold-hot-electricity exchange according to the present invention in an energy storage state;
in the figure: 1. a turbine-compressor integrated machine; 2. high temperature storage Leng Guan; 3. a cold storage-release Leng Huanre device; 4. a low temperature heat-storage tank; 5. an electric-power generation integrated machine; 6. a sub-compressor; 7. a heat storage-release heat exchanger; 8. an isenthalpic expansion valve; 9. a low temperature heat storage tank; 10. a high temperature heat storage tank; 11. a coupling;
fig. 4 is a diagram of the enthalpy entropy of the heat storage energy storage system with zero waste heat and cold-heat-electricity exchange according to the invention when supercritical carbon dioxide is used as working medium.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
a heat storage and energy storage system with zero waste heat cold-hot-electricity exchange comprises a cold storage system, a heat storage system, a turbine-compression integrated machine 1, an electric-power generation integrated machine 5, a secondary compressor 6 and an isenthalpic expansion valve 8. The cold storage system comprises a cold storage-release Leng Huanre device 3, a high-temperature cold storage tank 2 and a low-temperature cold storage tank 4; the heat storage system comprises a heat storage-release heat exchanger 7, a low-temperature heat storage tank 9, a high-temperature heat storage tank 10 and a coupler 11.
The left end of the electric-power generation integrated machine 5 is connected with the turbine-compression integrated machine 1, the right end of the electric-power generation integrated machine 5 is connected with the coupler 11, and the right end of the coupler 11 is connected with the auxiliary compressor 6. The high-temperature high-pressure side of the turbine-compression integrated machine 1 is connected with the high-temperature side of a heat storage-release heat exchanger 7 of the heat storage system through a two-way pipeline, the low-temperature low-pressure side of the turbine-compression integrated machine 1 is connected with the high-temperature side of a cold storage-release Leng Huanre device 3 of the cold storage system through a two-way pipeline, the low-temperature side of the heat storage-release heat exchanger 7 is unidirectionally communicated with the high-pressure side of a secondary compressor 6, and the low-pressure side of the secondary compressor 6 is unidirectionally communicated with the low-temperature side of the cold storage-release Leng Huanre device 3; the cold storage-release Leng Huanre device 3 is connected with the low pressure side of the auxiliary compressor 6 and is communicated with the low pressure side of the isenthalpic expansion valve 8 through a one-way pipeline, and is communicated with the high pressure side of the heat storage-release heat exchanger 7 and the auxiliary compressor 6 through the high pressure side of the isenthalpic expansion valve 8 in a one-way mode.
In the heat storage system, the high temperature side of the heat storage-release heat exchanger 7 is connected with the high temperature heat storage tank 10 through a bidirectional pipeline, and the low temperature side of the heat storage-release heat exchanger 7 is connected with the low temperature heat storage tank 9 through a bidirectional pipeline.
In the cold storage system, the low temperature side of the cold storage-release Leng Huanre device 3 is connected with the low temperature cold storage tank 4 through a bidirectional pipeline, and the high temperature side of the cold storage-release Leng Huanre device 3 is connected with the high temperature cold storage tank 2 through a bidirectional pipeline.
Compared with other working media, the system adopts supercritical carbon dioxide as a medium, can obtain higher high temperature, reduces the consumption of heat storage medium, and has compact structure and small occupied area. Meanwhile, the efficiency is higher than that of other working media. In addition, because the chemical property of the supercritical carbon dioxide is stable, the corrosion to materials is further reduced, and the service life of equipment is prolonged.
The heat storage medium is fused salt, the water, the organic medium or the fused salt is selected for storage Leng Jiezhi, and the heat exchange efficiency of the heat exchanger and the efficiency of the whole energy storage system are improved.
In the forward operation, the system is used for generating electricity, and at this time, the turbine-compressor integrated machine 1 is used as a turbine, the motor-generator integrated machine 5 is used as a generator, and the system releases energy. The system cycle is as follows: the supercritical carbon dioxide absorbs heat through the heat storage-release heat exchanger 7 and then enters the turbine-compression integrated machine 1 to do work to generate electricity. Then cooling is carried out through the cold storage-release Leng Huanre device 3, and finally pressure is increased through the auxiliary compressor 6, so that a loop is formed. The electric-power generation integrated machine 5 can transmit electric energy outwards through the driving of the shaft. The cold storage medium in the low temperature cold storage tank 4 flows through the cold storage-release Leng Huanre machine 3 to the high temperature cold storage tank 2, releasing cold; the heat storage medium in the high temperature heat storage tank 10 flows to the low temperature heat storage tank 9 through the heat storage-release heat exchanger 7, releasing heat. In the reverse operation, the system is used for energy storage, and in this case, the turbo-compressor 1 is used as a compressor, the electric-power generator 5 is used as a motor, and the system stores energy. The system cycle is as follows: the supercritical carbon dioxide releases heat through the heat storage-release heat exchanger 7 and enters the isenthalpic expansion valve 8 to perform isenthalpic expansion and cooling. Then the temperature is raised by the cold storage-release Leng Huanre device 3, and finally the pressure is increased by the turbine-compression integrated machine 1, so as to form a loop. The electric-power generation integrated machine 5 drives a shaft to provide power for the turbine-compression integrated machine 1. The cold storage medium in the high temperature cold storage tank 2 flows to the low temperature cold storage tank 4 through the cold storage-release Leng Huanre device 3 to store cold; the heat storage medium in the low-temperature heat storage tank 9 flows through the low-temperature heat storage tank 9 through the heat storage-release heat exchanger 7 to store heat.
The turbine-compressor integrated machine 1 adopts a turbine-compressor integrated machine technology with adjustable stationary blades, adopts an axial-flow turbine, can be used as a turbine when in forward use, can make expansion work of working media, pushes a shafting to rotate for generating electricity, and is used as a compressor when in reverse use, consumes energy, and enables the working media to be heated and boosted. By adjusting the angle of the stationary blade, the conversion between the turbine and the compressor is realized. According to the pressure value fed back by specific system parameters, the angle of the stationary blade is changed, and the angle of the incident airflow of the movable blade is changed, so that the turbine-compressor integrated machine can operate in a wider pressure range and can operate in an optimal working condition. The design makes the energy storage system compact in structure, reduces cost and occupies less area.
The electric-power generation integrated machine 5 adopts a power generation-electric integrated machine technology, and is used as a generator when in forward use, converts mechanical energy into electric energy to output, achieves the purpose of power generation, and is used as a motor when in reverse use, consumes the electric energy and drives the whole shafting to do work. The design ensures that the energy storage system is flexible and reliable, and can carry out power adjustment according to load change. Meanwhile, the number of equipment is effectively reduced, and the complexity of the system is simplified.
The isenthalpic expansion valve consists of a porous throttle orifice plate, a flashboard and a measuring and feedback control system, and is a throttle valve capable of automatically adjusting the opening of the flashboard according to the system state. The front end and the rear end of the valve are connected with a feedback loop, and the feedback loop is connected to a flashboard in the valve through a control motor. The temperature and the pressure of the gas at the front end and the rear end of the valve are measured and fed back to the position of the positioning flashboard in the loop, and the flashboard moves under the control of the stepping motor to shade the orifice of the throttle plate, so that the effective area of the throttle orifice on the throttle plate is controlled to control the fluid to flow, and the continuous adjustment of the temperature reduction and the pressure reduction in the wide range of 7.3-16MPa and 300-350K is realized. The aim of regulating the minimum temperature and the minimum pressure of the circulation is fulfilled by regulating the throttling strength, so that the cold storage capacity and the heat storage capacity are balanced, and zero waste heat is realized.
The turbine-compressor integrated machine 1, the electric-power generation integrated machine 5, the auxiliary compressor 6 and the coupling 11 are coaxially arranged, so that the whole system structure is compact. The process of power generation and energy storage is carried out in an integrated mode, so that the overall reliability of the system is improved. The aim of adjusting the circulation parameters by adjusting the rotational speed can be achieved by the coupling 11. Furthermore, the coupling 11 can be used to disconnect the secondary compressor when the system is undergoing a charge cycle, avoiding the generation of blowing heat.
When supercritical carbon dioxide is used as the working medium, the enthalpy entropy diagram is shown in fig. 4. Wherein the solid black line is an isenthalpic line and the solid red line is an isobar line. The blue solid line represents the energy storage cycle (1-2-3-4): 1-2 represents an isenthalpic expansion process, 2-3 represents an isobaric endothermic process, 3-4 represents an isentropic compression process, and 4-1 represents an isobaric exothermic process; the red dotted line represents the energy release cycle (1 '-4' -3 '-2'): 1'-4' represents an isobaric endothermic process, 4'-3' represents an isentropic expansion process, 3'-2' represents an isobaric exothermic process, and 2'-1' represents an isentropic compression process. Since the heat transfer process needs a certain temperature difference to be carried out, the positions 1', 4' are positioned below the positions 1 and 4, and the positions 2', 3' are positioned above the positions 2 and 3. By adjusting the circulation parameters, the aim of zero waste heat in the energy storage-release process is fulfilled. One cycle parameter that can be referenced is given below: when the circulation is operated in the forward direction, the system releases energy to generate electricity, as shown in figure 2, the inlet parameter of the turbine-compressor integrated machine 1 is 15.5MPa/695K, and the outlet parameter is 9.1MPa/629K; the inlet parameter of the auxiliary compressor 6 is 9MPa/307K, and the outlet parameter is 15.6MPa/321K. When the circulation is operated reversely, the energy storage and the electricity consumption of the system are realized, as shown in figure 3, the inlet parameter of the turbine-compressor integrated machine 1 is 7.38MPa/607K, and the outlet parameter is 16MPa/700K; the isenthalpic expansion valve 8 has an inlet parameter of 15.9MPa/323K and an outlet parameter of 7.4MPa/304K. The low-temperature heat storage tank temperature is 322K, the high-temperature heat storage tank temperature is 698K, the low-temperature heat storage tank temperature is 305K, and the high-temperature heat storage tank temperature is 610K.
It should be noted that in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "plurality" means at least two.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
In the drawings of the disclosed embodiments, only the methods related to the embodiments of the present disclosure are referred to, and other methods may refer to the general design, so that the same embodiment and different embodiments of the present disclosure may be combined with each other without conflict;
the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The utility model provides a cold and hot-electricity exchange's of zero waste heat accumulation energy storage system, includes cold storage system, heat accumulation system, turbine-compression all-in-one, electronic-power generation all-in-one, auxiliary compressor and isenthalpic expansion valve, its characterized in that:
the left end of the electric-power generation integrated machine is connected with the turbine-compression integrated machine, the right end of the electric-power generation integrated machine is connected with the coupler, and the right end of the coupler is connected with the auxiliary compressor; the high-temperature high-pressure side of the turbine-compressor integrated machine is connected with the high-temperature side of a heat storage-release heat exchanger of the heat storage system through a two-way pipeline, the low-temperature low-pressure side of the turbine-compressor integrated machine is connected with the high-temperature side of a cold storage-release Leng Huanre device of the cold storage system through a two-way pipeline, the low-temperature side of the heat storage-release heat exchanger is unidirectionally communicated with the high-pressure side of a secondary compressor, and the low-pressure side of the secondary compressor is unidirectionally communicated with the low-temperature side of the cold storage-release Leng Huanre device; the cold storage-release Leng Huanre device is connected with the low pressure side of the auxiliary compressor and is communicated with the low pressure side of the isenthalpic expansion valve through a one-way pipeline, and is communicated with the high pressure side of the heat storage-release heat exchanger and the auxiliary compressor in a one-way through the high pressure side of the isenthalpic expansion valve.
2. The zero waste heat cold-hot-electricity exchange thermal storage energy storage system of claim 1, wherein: the heat storage system comprises a heat storage-release heat exchanger, a low-temperature heat storage tank, a high-temperature heat storage tank and a coupling, wherein the high-temperature side of the heat storage-release heat exchanger is connected with the high-temperature heat storage tank through a bidirectional pipeline, and the low-temperature side of the heat storage-release heat exchanger is connected with the low-temperature heat storage tank through a bidirectional pipeline.
3. The zero waste heat cold-hot-electricity exchange thermal storage energy storage system of claim 1, wherein: the cold storage system comprises a cold storage-release Leng Huanre device, a high-temperature cold storage tank and a low-temperature cold storage tank, wherein the low-temperature side of the cold storage-release heat exchanger is connected with the low-temperature cold storage tank through a bidirectional pipeline, and the high-temperature side of the cold storage-release Leng Huanre device is connected with the high-temperature cold storage tank through a bidirectional pipeline.
4. The zero waste heat cold-hot-electricity exchange thermal storage energy storage system of claim 1, wherein: the turbine-compressor integrated machine adopts a turbine-compressor integrated machine technology with adjustable stationary blades, is used as a turbine in the forward direction through an axial flow turbine, is used as a compressor in the reverse direction, and realizes the conversion between the turbine and the compressor through adjusting the angle of the stationary blades.
5. The zero waste heat cold-hot-electricity exchange thermal storage energy storage system of claim 4, wherein: the turbine-compression integrated machine changes the angle of the stationary blade and the angle of the incident airflow of the movable blade according to the pressure value fed back by the system parameters.
6. The zero waste heat cold-hot-electricity exchange thermal storage energy storage system of claim 1, wherein: the electric-power generation integrated machine adopts a power generation-electric integrated machine technology, and is used as a generator in the forward direction and used as a motor in the reverse direction.
7. The zero waste heat cold-hot-electricity exchange thermal storage energy storage system of claim 1, wherein: the isenthalpic expansion valve consists of a vertical porous throttling orifice plate, a flashboard and a measuring and feedback control system, and is a throttling valve capable of automatically adjusting the opening of the flashboard according to the system state; the front end and the rear end of the isenthalpic expansion valve are connected with a measuring and feedback control system, the measuring and feedback control system is connected to a flashboard inside the isenthalpic expansion valve through a control motor, and the flashboard moves up and down through the control of a stepping motor to shade the orifice plate.
8. A zero waste heat cold-hot-electrical interchange thermal storage energy storage system as defined in any one of claims 1-7, wherein: the turbine-compression integrated machine, the electric-power generation integrated machine, the auxiliary compressor and the coupling are coaxially arranged.
9. A zero waste heat cold-hot-electrical interchange thermal storage energy storage system as defined in any one of claims 1-7, wherein: supercritical carbon dioxide is used as a flow medium of the system.
10. A zero waste heat cold-hot-electrical interchange thermal storage energy storage system as defined in any one of claims 1-7, wherein: the heat storage medium of the system is molten salt, and the cold storage medium is water, organic medium or molten salt.
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| US10233787B2 (en) * | 2016-12-28 | 2019-03-19 | Malta Inc. | Storage of excess heat in cold side of heat engine |
| CN210370822U (en) * | 2019-06-04 | 2020-04-21 | 中国科学院工程热物理研究所 | Heat pump energy storage power generation system based on array cold storage and heat storage |
| CN110159379B (en) * | 2019-06-14 | 2024-01-09 | 国家电投集团科学技术研究院有限公司 | Multistage heat pump type double-tank molten salt energy storage power generation system |
| CN112483436B (en) * | 2020-11-23 | 2023-04-07 | 东方电气集团东方汽轮机有限公司 | Compression-expansion integrated turbine set |
| CN113187573A (en) * | 2021-05-17 | 2021-07-30 | 西安热工研究院有限公司 | Supercritical carbon dioxide power generation coaxial integrated equipment and displacement type energy storage method |
| CN114370720B (en) * | 2022-01-05 | 2023-03-24 | 浙江态能动力技术有限公司 | Energy storage device based on ultra-high temperature heat pump |
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