CN118167452B - Waste heat energy storage system and method - Google Patents
Waste heat energy storage system and method Download PDFInfo
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- CN118167452B CN118167452B CN202410564843.8A CN202410564843A CN118167452B CN 118167452 B CN118167452 B CN 118167452B CN 202410564843 A CN202410564843 A CN 202410564843A CN 118167452 B CN118167452 B CN 118167452B
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- 239000002918 waste heat Substances 0.000 title claims abstract description 131
- 238000004146 energy storage Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 22
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 264
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 132
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 132
- 238000010248 power generation Methods 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- 230000008859 change Effects 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 230000005611 electricity Effects 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims description 45
- 230000006835 compression Effects 0.000 claims description 44
- 239000007789 gas Substances 0.000 claims description 33
- 238000001816 cooling Methods 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 10
- 230000002441 reversible effect Effects 0.000 claims description 7
- 239000002440 industrial waste Substances 0.000 description 6
- 239000012071 phase Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/006—Accumulators and steam compressors
-
- 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
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/006—Systems for storing electric energy in the form of pneumatic energy, e.g. compressed air energy storage [CAES]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a waste heat energy storage system and a waste heat energy storage method, comprising an energy storage module and a waste heat power generation module, wherein the energy storage module comprises a first container for containing carbon dioxide and a second container for containing carbon dioxide, a circulation path for circulating the carbon dioxide is formed between the first container and the second container through a first pipeline and a second pipeline which are arranged in parallel, and the energy storage module can store energy and release energy by utilizing the phase change process of the carbon dioxide; the waste heat power generation module comprises a third pipeline which is coupled between the first pipeline and the second pipeline, the first pipeline and the second pipeline provide carbon dioxide for the third pipeline, the third pipeline is a closed loop, a waste heat heating device is arranged in the third pipeline, waste heat of production equipment can be obtained by the waste heat heating device, and power generation is performed through circulation of the carbon dioxide in the third pipeline. Therefore, the waste heat energy storage system and the waste heat energy storage method are used for coupling the waste heat power generation module with the energy storage module, and can be organically cooperated with peak-valley time periods of industrial electricity.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a waste heat energy storage system and a waste heat energy storage method.
Background
Carbon dioxide is a natural excellent working medium which is environment-friendly and widely applied to the fields of power generation, refrigeration, energy storage and the like. Carbon dioxide is used as a working medium for power cycle of waste heat power generation, and is suitable for high-grade industrial waste heat power generation due to the advantages of large working temperature range, high power generation efficiency, compact equipment, small occupied area, good investment income and the like, but the waste heat power generation usually runs continuously and cannot be organically cooperated with peak-valley time periods of industrial power utilization so as to further increase the profit from peak-valley electricity prices, and low-grade heat discharged by the waste heat power generation cannot be further utilized.
The carbon dioxide energy storage system has the advantages of safety, environmental protection, reliability, long time and the like, and is suitable for energy storage at the side of industrial users. When the carbon dioxide stores energy, cold energy is needed to condense the carbon dioxide, and when the energy is released outwards, liquid carbon dioxide is evaporated, heat is needed in the evaporation process, and meanwhile, heat generated in the compression process is also needed to be stored in a heat storage facility, so that the carbon dioxide is low in energy storage efficiency, complex in system, more in occupied area and higher in investment.
Disclosure of Invention
Accordingly, the present invention is directed to a waste heat energy storage system and method, which can solve the problems of continuous power generation by waste heat and incapability of organic cooperation with peak-to-valley periods of industrial power. In order to achieve the above purpose, the present invention provides the following technical solutions:
A waste heat energy storage system comprising:
The energy storage module comprises a first container for containing carbon dioxide and a second container for containing the carbon dioxide, a circulation path for circulating the carbon dioxide is formed between the first container and the second container through a first pipeline and a second pipeline which are arranged in parallel, and the energy storage module can store energy and release energy by utilizing a phase change process of the carbon dioxide;
The waste heat power generation module comprises a third pipeline which is coupled between the first pipeline and the second pipeline, the first pipeline and the second pipeline are used for providing the carbon dioxide for the third pipeline, the third pipeline is a closed loop, a waste heat heating device is arranged in the third pipeline, waste heat of production equipment can be obtained by the waste heat heating device, the waste heat heating device heats the carbon dioxide through the waste heat, and power generation is performed through circulation of the carbon dioxide in the third pipeline.
Optionally, in the above waste heat energy storage system, the third pipeline further includes a first expansion device, a first cooling device, and a first compression device, where the waste heat heating device, the first expansion device, the first cooling device, and the first compression device are sequentially communicated to form the closed loop.
Optionally, in the above waste heat energy storage system, the waste heat heating device includes a first chamber and a second chamber that are independent from each other; the first chamber communicates with the first compression device and the first expansion device through the third pipeline; the second chamber is communicated with the production equipment to obtain a heat exchange medium carrying the waste heat; the carbon dioxide and the heat exchange medium in the first chamber exchange heat to warm the carbon dioxide and cool the heat exchange medium.
Optionally, in the above waste heat energy storage system, the production device has a pipe network:
The heat exchange medium is liquid water, the pipe network is communicated with the second chamber, and the liquid water carrying the waste heat is provided for the second chamber;
or the heat exchange medium is steam, the pipe network is communicated with the second chamber, and the steam carrying the waste heat is provided for the second chamber.
Optionally, in the above waste heat energy storage system, the first pipeline is sequentially provided with a second compression device, a third compression device, a second cooling device, the first compression device, the third cooling device, the condenser and the subcooler in the third pipeline of the coupling part;
The evaporator, the waste heat heating device, the first expansion device, the second expansion device and the third expansion device are sequentially arranged in the second pipeline, and the coupling part is arranged in the third pipeline.
Optionally, in the above waste heat energy storage system, the system further includes a fourth pipeline, the fourth pipeline is a closed loop, the fourth pipeline is sequentially provided with a coupling portion of the third compression device and the second cooling device in the first pipeline, a coupling portion of the second expansion device in the second pipeline, and the subcooler.
Optionally, in the above waste heat energy storage system, the waste heat energy storage system further includes a fifth pipeline, and the fifth pipeline is sequentially connected with the first expansion device, the evaporator and the first cooling device.
Optionally, in the above waste heat energy storage system, the first pipeline and the second pipeline are connected to the second container through a reversible pump;
or the first pipeline is connected with the second container through a turbine, and the second pipeline is connected with the second container through a pump.
Optionally, in the above waste heat energy storage system, the exhaust pressure of the third expansion device is greater than the pressure of the first container.
The waste heat energy storage method is suitable for the waste heat energy storage system, can store energy and release energy by utilizing the phase change of carbon dioxide through different pipelines according to different electricity utilization periods, and comprises the following steps:
flat period:
the waste heat heating device in the waste heat power generation module obtains waste heat of production equipment, the waste heat heating device heats carbon dioxide through the waste heat, and power generation is performed through circulation of the carbon dioxide in a third pipeline;
valley period:
The first pipelines of the waste heat power generation module and the energy storage module are operated at the same time, and the operation of the waste heat power generation module is the same as the flat electric period;
when energy storage is started, the liquid carbon dioxide in the first container in the first pipeline is changed into solid and gas, the solid carbon dioxide is remained in the first container, the gas carbon dioxide output is compressed and converted into high pressure, and the carbon dioxide with the high pressure gas is input into the second container after the carbon dioxide with the constant pressure phase change into high pressure liquid;
Peak electrical time period:
The second pipeline of the energy storage module operates, the carbon dioxide in the high-pressure liquid state is changed into the high-pressure gas state, the carbon dioxide in the high-pressure gas state is expanded to generate electricity to realize energy release, namely, the carbon dioxide in the second container is changed from the high-pressure liquid state into the high-pressure gas state, the carbon dioxide in the high-pressure gas state is re-expanded to be changed into the carbon dioxide in the low-pressure gas state, and the carbon dioxide is input into the first container and is changed into the liquid state together with the solid carbon dioxide in the first container.
According to the technical scheme, the waste heat energy storage system provided by the invention adopts the carbon dioxide working medium, the waste heat power generation module is coupled with the energy storage module, the waste heat power generation and energy storage integrated device is constructed, the utilization rate of industrial waste heat is further excavated, the energy storage system is simplified, and the energy storage efficiency is improved, so that the investment is reduced, the income is improved, the system can be organically cooperated with peak-valley time periods of industrial electricity, the profit is further increased from the peak-valley electricity price, and the application conditions of industrial user scenes are fully met.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of a waste heat energy storage system according to an embodiment of the present invention.
Wherein:
1-first line, 11-first vessel, 12-second vessel, 13-second compression device, 14-third compression device, 15-second cooling device, 16-third cooling device, 17-condenser, 18-subcooler,
2-Second line, 21-evaporator, 22-second expansion device, 23-third expansion device, 24-reversible pump,
3-Third pipeline, 31-waste heat heating device, 32-first expansion device, 33-first cooling device, 34-first compression device,
4-Fourth pipeline, 5-fifth pipeline.
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.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or directions or positional relationships in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, 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.
As shown in fig. 1, an embodiment of the present invention provides a waste heat energy storage system.
Firstly, the waste heat energy storage system comprises an energy storage module and a waste heat power generation module, wherein the energy storage module comprises a first container 11 for containing carbon dioxide and a second container 12 for containing carbon dioxide, a circulation path for circulating the carbon dioxide is formed between the first container 11 and the second container 12 through a first pipeline 1 and a second pipeline 2 which are arranged in parallel, and the energy storage module can store and release energy by utilizing the phase change process of the carbon dioxide; the waste heat power generation module comprises a third pipeline 3 coupled between a first pipeline 1 and a second pipeline 2, the first pipeline 1 and the second pipeline 2 provide carbon dioxide for the third pipeline 3, the third pipeline 3 is a closed loop, a waste heat heating device 31 is arranged in the third pipeline 3, the waste heat heating device 31 can acquire waste heat of production equipment, the waste heat heating device 31 heats carbon dioxide through the waste heat, and power generation is performed through circulation of the carbon dioxide in the third pipeline 3. It should be noted that the pipe may be a single pipe or a conveying path provided with a functional device (i.e., a device or a valve or a component having a specific function). And the first container 11 is used for outputting, storing and inputting carbon dioxide, and outputting and inputting carbon dioxide is realized through the state change of the carbon dioxide, and the thermodynamic state of the carbon dioxide in the first container 11 is the thermodynamic state of a gas-liquid-solid coexistence point. In the second vessel 12, the thermodynamic state of carbon dioxide is that of a high-pressure liquid phase, and the pressure value is preferably 4 to 6MPa, and is exemplified as 4MPa, 4.5MPa, 5MPa, 5.5MPa, 6MPa, or the like. Furthermore, the coupling described herein forms a continuous fluid channel for direct physical connection, i.e. the third line 3 and the first line 1 have a common line portion in which the carbon dioxide in both lines is mixed; the third line 3 and the second line 2 have a common line portion in which the carbon dioxide in both lines is mixed. Production facilities are typically industrial facilities for operations that often generate large amounts of heat.
Therefore, the waste heat energy storage system provided by the embodiment of the invention adopts the carbon dioxide working medium, the waste heat power generation module is coupled with the energy storage module, the waste heat power generation and energy storage integrated device is constructed, the utilization rate of industrial waste heat is further excavated, the energy storage system is simplified, and the energy storage efficiency is improved, so that the investment is reduced, the income is improved, the waste heat energy storage system can be organically cooperated with peak-valley time periods of industrial power consumption, the profit is further increased from the peak-valley power price, and the application condition of industrial user scenes is fully satisfied.
In specific implementation, the third pipeline 3 further includes a first expansion device 32, a first cooling device 33, and a first compression device 34, where the waste heat heating device 31, the first expansion device 32, the first cooling device 33, and the first compression device 34 are sequentially connected to form a closed loop (i.e., a waste heat power generation loop). The waste heat power generation loop adopts carbon dioxide circulation, industrial waste heat is recovered for power generation, and the waste heat heating device 31 recovers the industrial waste heat and heats high-pressure carbon dioxide working medium; the high-pressure carbon dioxide working medium heated by the waste heat is expanded by a first expansion device 32 to generate power; the exhaust gas from the first expansion device 32 is cooled by the first cooling device 33, compressed to a high pressure by the first compression device 34, and supplied to the waste heat heating device 31. The first compression device 34 is typically driven by an electric motor. The first expansion device 32 includes one or more first expansion machines arranged in series, but not limited thereto, and the plurality of first expansion machines may be arranged in parallel or may be arranged in a mixed manner in series-parallel, and those skilled in the art may specifically design the expansion device according to actual needs. The first compression device 34 includes one or more first compressors disposed in series, but not limited thereto, and the plurality of first compressors may be disposed in parallel or may be disposed in a mixed manner in series and parallel, and may be specifically designed according to actual needs by those skilled in the art. And the expansion machine comprises, but is not limited to, a turbine type, and the principle is that energy of a medium converts kinetic energy when flowing through a spray pipe, and when flowing through a rotor, fluid impacts a blade to drive the rotor to rotate, so that a shaft of the expansion machine is driven to rotate. The expander shaft directly or drives other machines (generators) through a transmission mechanism to output mechanical work, so that the energy release of the energy storage system is realized.
In particular, the waste heat heating device 31 comprises a first chamber and a second chamber which are independent from each other; the first chamber communicates with the first compression means 34 and the first expansion means 32 through the third conduit 3; the second chamber is communicated with production equipment to obtain a heat exchange medium carrying waste heat; the carbon dioxide in the first chamber exchanges heat with the heat exchange medium to warm the carbon dioxide and cool the heat exchange medium. The industrial waste heat is a byproduct generated in the production process, and the energy utilization efficiency can be remarkably improved by effectively utilizing the energy which is originally wasted by the waste heat, so that the requirement on newly-increased energy is reduced, the energy cost of enterprises is reduced, the economic benefit is improved, the energy supply pressure is relieved, and the energy structure optimization is promoted. If the waste heat generated in many industrial production processes is directly discharged into the environment, not only energy is wasted, but also thermal pollution can be caused, such as local air temperature rise, water body temperature rise and other environmental problems, the unnecessary energy discharge can be reduced, and the influence on the thermal pollution of the environment can be reduced. The waste heat utilization is equivalent to indirectly reducing the emission of greenhouse gases such as carbon dioxide and the like generated by additionally burning fossil fuel to meet the same heat energy requirement, and has positive significance for coping with global climate change, fulfilling emission reduction commitment and realizing low-carbon development targets.
In particular, the production facility has a network of pipes: the heat exchange medium is liquid water, the pipe network is communicated with the second chamber, the liquid water carrying waste heat is provided for the second chamber, namely, the production equipment is provided with a hot water pipe network, the water after the production operation carries the waste heat generated by the production operation and enters the hot water pipe network, and the hot water pipe network is communicated with the second chamber so as to carry out heat exchange between the water carrying the waste heat and carbon dioxide (circulating medium) in the first chamber, so that the waste heat is transmitted to the carbon dioxide, and the temperature of the carbon dioxide is raised; or the heat exchange medium is steam, the pipe network is communicated with the second chamber, the steam carrying waste heat is provided for the second chamber, namely, the production equipment is provided with the steam pipe network, the steam generated in production operation enters the steam pipe network, and the steam pipe network is communicated with the second chamber so as to exchange heat between the steam and carbon dioxide (circulating medium) in the first chamber, so that the waste heat carried by the steam is transferred to the carbon dioxide, and the temperature of the carbon dioxide is raised. However, the waste heat heating device 31 may also include an air heat exchanger to obtain the waste heat in the air of the production plant where the production equipment is located, and the specific structure and the connection relationship with the production equipment of the waste heat heating device 31 may be designed specifically by those skilled in the art according to actual needs.
In the specific implementation, the first pipeline 1 is sequentially provided with a second compression device 13, a third compression device 14, a second cooling device 15, a first compression device 34 (namely, the first compression device 34 is shared by the third pipeline 3) in the coupling part third pipeline 3, a third cooling device 16, a condenser 17 and a subcooler 18; the evaporator 21, the second expansion device 22 and the third expansion device 23 are sequentially disposed in the second pipeline 2, and the waste heat heating device 31 and the first expansion device 32 (i.e., the waste heat heating device 31 and the first expansion device 32 are shared by the third pipeline 3) in the third pipeline 3 are coupled. The arrangement of the second expansion device 22 and the third expansion device 23 can be seen in the form of the first expansion device 32. The arrangement of the second compression means 13 and the third compression means 14 can be seen in the form of the first compression means 34.
In the specific implementation, the system further comprises a fourth pipeline 4, the fourth pipeline 4 is a closed loop, the fourth pipeline 4 is sequentially provided with a third compression device 14 and a second cooling device 15 (namely, the third compression device 14 and the second cooling device 15 are shared by the first pipeline 1) in the coupling part, and a second expansion device 22 (namely, the second expansion device 22 is shared by the second pipeline 2) in the second pipeline 2 in the coupling part, so that the subcooler 18 is arranged. The first pipeline 1 and the fourth pipeline 4 realize electric energy storage by converting low-pressure carbon dioxide into high-pressure carbon dioxide; second expansion means 22 connected at the outlet of the second cooling means 15 to a bypass (i.e. fourth conduit 4) of the low pressure side inlet of the subcooler 18; the second compression device 13 primarily compresses the carbon dioxide gas output from the first container 11; the third compression device 14 compresses again the carbon dioxide gas output from the second compression device 13 and the carbon dioxide gas output from the low pressure side of the subcooler 18; the second cooling device 15 cools the exhaust gas of the third compression device 14; the third cooling device 16 cools one path of the exhaust gas of the first compression device 34; the condenser 17 condenses and liquefies the carbon dioxide output from the third cooling device 16; the subcooler 18 cools the liquid carbon dioxide output from the condenser 17 and then outputs the cooled liquid carbon dioxide to the second container 12.
In particular, the system further comprises a fifth pipeline 5, and the fifth pipeline 5 is sequentially connected with the first expansion device 32, the evaporator 21 and the first cooling device 33. In the second pipeline 2 and the fifth pipeline 5, power generation is realized by converting high-pressure carbon dioxide into low-pressure carbon dioxide; the evaporator 21 gasifies the liquefied carbon dioxide output from the second container 12 by the heat of the exhaust gas from the first expansion device 32, and the third expansion device 23 further expands the exhaust gas from the second expansion device 22 to generate power and inputs the generated power into the first container 11.
In practice, the first line 1 and the second line 2 are connected to the second container 12 by means of a reversible pump 24; or the first pipeline 1 is connected with the second container 12 through a turbine, and carbon dioxide output from the subcooler 18 is conveyed to the second container 12 through the action of pressure energy recovery through the depressurization of the turbine; the second pipe 2 is connected to the second container 12 by a pump, and carbon dioxide in the second container 12 is sent to the evaporator 21 by a pressurizing function of the pump. The reversible pump 24 has both the functions of reducing the pressure and recovering the pressure energy and pressurizing the pressure, and can recover and output the carbon dioxide from the second container 12.
In practice, the discharge pressure of the third expansion device 23 is greater than the pressure of the first container 11, so that the discharge of the third expansion device 23 is fed into the first container 11 according to the pressure difference.
The waste heat energy storage method is suitable for the waste heat energy storage system, can store energy and release energy by utilizing the phase change of carbon dioxide through different pipelines according to different electricity utilization periods, and comprises the following steps:
flat period:
The waste heat heating device 31 in the waste heat power generation module outputs high-temperature and high-pressure carbon dioxide, the carbon dioxide is expanded by the first expansion device 32 to generate power, then cooled by the first cooling device 33, compressed into high pressure by the first compression device 34, and then enters the waste heat heating device 31 to heat and raise the temperature, so that the waste heat power generation is circularly completed, and the energy is released;
valley period:
the first pipelines 1 of the waste heat power generation module and the energy storage module are operated at the same time, and the operation of the waste heat power generation module is the same as the flat electric period;
When the energy storage is started, the liquid carbon dioxide in the first container 11 in the first pipeline 1 is changed into solid and gas, the solid carbon dioxide is remained in the first container 11, the gas carbon dioxide output is converted into high pressure through compression, the high-pressure gas carbon dioxide is converted into high-pressure liquid carbon dioxide through isophase transformation, and the high-pressure liquid carbon dioxide is input into the second container 12; gaseous carbon dioxide is output, compressed by a second compression device 13, compressed by a third compression device 14, cooled by a second cooling device 15 and divided into two parts, the first part is gathered into a first compression device 34, the second part is input into a second expansion device 22 for expansion and cooling, the first part of carbon dioxide output by the first compression device 34 enters the third cooling device 16 for cooling, condensed and liquefied by a condenser 17, and further cooled after heat exchange between the second part of carbon dioxide output by the second expansion device 22 and a cooler 18, the second part of carbon dioxide is output from the cooler 18 and is gathered into the third compression device 14, the first part of carbon dioxide is depressurized by a reversible pump 24 and pressure energy is recovered, and finally the first part of carbon dioxide is input into a second container 12; the waste heat power generation and energy storage are completed in the process;
Peak electrical time period:
The second pipeline 2 of the energy storage module operates, the high-pressure liquid carbon dioxide is changed into high-pressure gas, and the high-pressure gas carbon dioxide is expanded to generate electricity to realize energy release, namely, the carbon dioxide in the second container 12 is changed from the high-pressure liquid phase into the high-pressure gas, the high-pressure gas carbon dioxide is expanded again to be changed into low-pressure gas carbon dioxide, and the low-pressure gas carbon dioxide is input into the first container 11 and is changed into liquid carbon dioxide together with the solid carbon dioxide in the first container 11; the second container 12 outputs liquid carbon dioxide to the reversible pump 24, the liquid carbon dioxide is pressurized by the reversible pump 24 and then is conveyed to the evaporator 21 for gasification, then the liquid carbon dioxide is conveyed to the waste heat heating device 31 for heating and heating, then the liquid carbon dioxide is conveyed to the first expansion device 32 for expansion and power generation, the first expansion device 32 exhausts the waste heat released by the evaporator 21 and then is conveyed to the second expansion device 22 for expansion and power generation, then the third expansion device 23 is used for expansion and power generation, and finally the low-temperature gaseous carbon dioxide is conveyed to the first container 11 and is jointly transformed into the liquid state with the solid carbon dioxide in the first container 11; whereby the process completes the energy release.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. The foregoing is merely illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A waste heat energy storage system, comprising:
The energy storage module comprises a first container (11) for containing carbon dioxide and a second container (12) for containing the carbon dioxide, wherein a circulation path for the carbon dioxide to circulate is formed between the first container (11) and the second container (12) through a first pipeline (1) and a second pipeline (2) which are arranged in parallel, and the energy storage module can store and release energy by utilizing the phase change process of the carbon dioxide;
The waste heat power generation module comprises a third pipeline (3) which is coupled between the first pipeline (1) and the second pipeline (2), the first pipeline (1) and the second pipeline (2) are used for providing carbon dioxide for the third pipeline (3), the third pipeline (3) is a closed loop, a waste heat heating device (31) is arranged in the third pipeline (3), and the waste heat heating device (31) can acquire waste heat of production equipment, and the waste heat heating device (31) heats the carbon dioxide through the waste heat and generates power through circulation of the carbon dioxide in the third pipeline (3).
2. The waste heat energy storage system according to claim 1, wherein the third pipeline (3) further comprises a first expansion device (32), a first cooling device (33) and a first compression device (34), and the waste heat heating device (31), the first expansion device (32), the first cooling device (33) and the first compression device (34) are sequentially communicated to form the closed loop.
3. Waste heat energy storage system according to claim 2, characterized in that the waste heat heating means (31) comprise a first chamber and a second chamber independent from each other; the first chamber communicates with the first compression device (34) and the first expansion device (32) through the third pipeline (3); the second chamber is communicated with the production equipment to obtain a heat exchange medium carrying the waste heat; the carbon dioxide and the heat exchange medium in the first chamber exchange heat to warm the carbon dioxide and cool the heat exchange medium.
4. The waste heat energy storage system of claim 3, wherein the production facility has a network of pipes:
The heat exchange medium is liquid water, the pipe network is communicated with the second chamber, and the liquid water carrying the waste heat is provided for the second chamber;
or the heat exchange medium is steam, the pipe network is communicated with the second chamber, and the steam carrying the waste heat is provided for the second chamber.
5. The waste heat energy storage system according to claim 2, wherein a second compression device (13), a third compression device (14), a second cooling device (15), the first compression device (34), a third cooling device (16), a condenser (17) and a subcooler (18) in the third pipeline (3) are sequentially arranged in the first pipeline (1);
An evaporator (21) is sequentially arranged in the second pipeline (2), the waste heat heating device (31) and the first expansion device (32) in the third pipeline (3) are coupled, the second expansion device (22) is connected with the third expansion device (23).
6. The waste heat energy storage system according to claim 5, further comprising a fourth pipeline (4), wherein the fourth pipeline (4) is a closed loop, the fourth pipeline (4) is sequentially provided with a coupling part of the third compression device (14) and the second cooling device (15) in the first pipeline (1), and a coupling part of the second expansion device (22) in the second pipeline (2), and the subcooler (18).
7. The waste heat energy storage system of claim 5, further comprising a fifth pipeline (5), the fifth pipeline (5) being connected in sequence to the first expansion device (32), the evaporator (21) and the first cooling device (33).
8. Waste heat energy storage system according to claim 1, characterized in that the first and second pipelines (1, 2) are connected to the second container (12) by means of a reversible pump (24);
or the first pipeline (1) is connected with the second container (12) through a turbine, and the second pipeline (2) is connected with the second container (12) through a pump.
9. Waste heat energy storage system according to claim 5, characterized in that the discharge pressure of the third expansion device (23) is greater than the pressure of the first vessel (11).
10. A waste heat energy storage method, suitable for the waste heat energy storage system as claimed in any one of claims 1 to 9, characterized in that energy storage and energy release can be performed by using phase change of carbon dioxide through different pipelines according to different electricity utilization periods, comprising:
flat period:
A waste heat heating device (31) in the waste heat power generation module obtains waste heat of production equipment, the waste heat heating device (31) heats carbon dioxide through the waste heat, and power generation is performed through circulation of the carbon dioxide in a third pipeline (3);
valley period:
The first pipelines (1) of the waste heat power generation module and the energy storage module run simultaneously, and the running of the waste heat power generation module is the same as the flat electric period;
When energy storage is started, the carbon dioxide in a liquid state in a first container (11) in the first pipeline (1) is changed into a solid state and a gas state, the carbon dioxide in the solid state is remained in the first container (11), the carbon dioxide output in the gas state is compressed and converted into high pressure, and the carbon dioxide in the high pressure gas is subjected to isophase phase change into the carbon dioxide in a high pressure liquid state and is input into a second container (12);
Peak electrical time period:
the second pipeline (2) of the energy storage module operates, the carbon dioxide in a high-pressure liquid state is changed into a high-pressure gas state, the carbon dioxide in the high-pressure gas state is expanded to generate electricity to realize energy release, namely, the carbon dioxide in the second container (12) is changed from the high-pressure liquid state into the high-pressure gas state, the carbon dioxide in the high-pressure gas state is re-expanded and converted into the carbon dioxide in a low-pressure gas state, and the carbon dioxide is input into the first container (11) and is jointly changed into a liquid state together with the carbon dioxide in the first container (11).
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| CN115750009A (en) * | 2022-11-24 | 2023-03-07 | 西安交通大学 | Energy storage power peak shaving system and operation method for carbon capture and liquefied natural gas cold energy utilization |
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| CN115750009A (en) * | 2022-11-24 | 2023-03-07 | 西安交通大学 | Energy storage power peak shaving system and operation method for carbon capture and liquefied natural gas cold energy utilization |
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