CN117728713A - Thermoelectric energy storage power generation system - Google Patents
Thermoelectric energy storage power generation system Download PDFInfo
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- CN117728713A CN117728713A CN202311814936.3A CN202311814936A CN117728713A CN 117728713 A CN117728713 A CN 117728713A CN 202311814936 A CN202311814936 A CN 202311814936A CN 117728713 A CN117728713 A CN 117728713A
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- temperature difference
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- 238000004146 energy storage Methods 0.000 title claims abstract description 75
- 238000010248 power generation Methods 0.000 title claims abstract description 73
- 238000005338 heat storage Methods 0.000 claims abstract description 52
- 238000012546 transfer Methods 0.000 claims abstract description 15
- 239000012782 phase change material Substances 0.000 claims description 28
- 230000008859 change Effects 0.000 claims description 17
- 238000009835 boiling Methods 0.000 claims description 6
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 claims description 6
- HRYZWHHZPQKTII-UHFFFAOYSA-N chloroethane Chemical compound CCCl HRYZWHHZPQKTII-UHFFFAOYSA-N 0.000 claims description 3
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 claims description 3
- 235000019404 dichlorodifluoromethane Nutrition 0.000 claims description 3
- 229960003750 ethyl chloride Drugs 0.000 claims description 3
- 150000008282 halocarbons Chemical class 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 150000002484 inorganic compounds Chemical class 0.000 claims description 3
- 229910010272 inorganic material Inorganic materials 0.000 claims description 3
- 239000001282 iso-butane Substances 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 claims description 3
- IJDNQMDRQITEOD-UHFFFAOYSA-N sec-butylidene Natural products CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 3
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 11
- 238000005381 potential energy Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 7
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- 239000007864 aqueous solution Substances 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- IIYFAKIEWZDVMP-UHFFFAOYSA-N tridecane Chemical compound CCCCCCCCCCCCC IIYFAKIEWZDVMP-UHFFFAOYSA-N 0.000 description 2
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 1
- 101100477838 Caenorhabditis elegans smu-2 gene Proteins 0.000 description 1
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- 235000021360 Myristic acid Nutrition 0.000 description 1
- -1 SMU-7 Substances 0.000 description 1
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Abstract
The invention discloses a temperature difference energy storage power generation system. The temperature difference energy storage power generation system comprises a cold storage tank (1), a heat storage tank (2), a heat transfer device (3) and a temperature difference power generation device (4); the heat transfer device is used for transferring heat energy in the cold storage tank to the heat storage tank under electric drive; the thermoelectric power generation device is used for generating power by utilizing the temperature difference between the cold storage tank and the heat storage tank. The temperature difference energy storage power generation system realizes the energy storage power generation efficiency based on the temperature difference energy storage form, thereby creating a brand-new energy storage power generation mode; the temperature difference energy storage power generation system has stable power generation efficiency, low price, no environmental hazard, simple and compact structure and small occupied area, can solve the requirements of large-scale energy storage and power supply, and provides technical support of a brand new way for fully and reasonably applying green energy.
Description
Technical Field
The invention relates to energy storage power generation, in particular to a temperature difference energy storage power generation system.
Background
In order to solve the problems of global limited energy shortage, environmental deterioration and the like, energy storage technology has been the focus of attention in the world when using energy. The technology can store energy in a special medium for release when needed. In recent years, the research and the utilization of energy storage technology are encouraged and supported by the related policies of the continuous development of China, and the energy storage technology is proposed to accord with the supporting action of energy green low-carbon transformation technology of China.
In the prior energy storage technology, pumped storage is the most widely applied large-scale energy storage technology, which utilizes potential energy of water to store electric quantity, but requires huge investment in the early stage and a proper geographic environment; the compressed air energy storage is to store electric quantity by compressing air, and the generator is driven to supply power when needed, so that the construction conditions are harsh due to the special geographical conditions such as abandoned mines or underground caves; electrochemical energy storage is one of the technologies currently under development, and electric energy is stored in a battery through electrochemical reaction, but the problems of safety, environmental protection and the like are generally existed; flywheel energy storage utilizes inertial storage electric quantity to release the electric energy as required, but the aspects of discharge time, safety and the like are to be improved. Therefore, the technology has the advantages of harsher geographical environment conditions, huge early investment or environmental problems such as environmental protection.
At present, a technology of utilizing temperature difference power generation exists, the existing temperature difference power generation technology utilizes the temperature difference between a high-temperature heat source and a low-temperature heat source, and on the basis of Rankine cycle, a low-boiling point working medium is heated and evaporated in a circulation loop, then blades are pushed in an expander to generate power, and the utilized low-boiling point working medium enters a condenser to be condensed and then is continuously sent into an evaporator by a working medium pump, so that a complete cycle is formed. The main components of the thermoelectric power generation system comprise an evaporator, a condenser, a compressor, an expander, a generator, a working medium pump and a working medium circulating pipeline, wherein all the components are connected in series to form a working medium circulating loop, and working medium in the circulating loop is low-boiling-point working medium.
Currently, no attempt is made to realize an energy storage power generation mode based on a phase change material temperature difference energy storage mode.
Disclosure of Invention
The invention aims to provide a temperature difference energy storage power generation system which can realize the energy storage power generation efficiency based on a temperature difference energy storage form.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the temperature difference energy storage power generation system comprises a cold storage tank, a heat transfer device and a temperature difference power generation device;
the heat transfer device is used for transferring heat energy in the cold storage tank to the heat storage tank under electric drive;
the thermoelectric power generation device is used for generating power by utilizing the temperature difference between the cold storage tank and the heat storage tank.
Further, an energy storage heat exchange pipeline and a power generation heat exchange pipeline are arranged in the cold storage tank and the heat storage tank;
the heat transfer device comprises a compressor, an evaporator and a condenser; the compressor, the evaporator and the condenser are connected in series through pipelines to form an energy storage circulation loop, and the energy storage circulation loop is filled with heat exchange medium; the evaporator is connected with an energy storage heat exchange pipeline in the cold storage tank in an assembling way, and the condenser is connected with the energy storage heat exchange pipeline in the heat storage tank in an assembling way;
the power generation heat exchange pipeline of the cold storage tank is connected with the power generation heat exchange pipeline of the heat storage tank through a pipeline to form a power generation circulation loop, and the power generation circulation loop is filled with low-boiling-point medium;
the thermoelectric generation device comprises a circulating pump, an expander and a generator; the circulating pump and the expander are both arranged on the power generation circulating loop, the circulating pump drives a medium in a pipe section where the circulating pump is positioned to flow from the cold storage tank to the heat storage tank, and the expander is arranged on a hot-cold flow pipe section; the generator is driven by an expander.
Further, the cold storage tank and the heat storage tank are filled with phase change materials, and the phase change temperature of the phase change materials in the cold storage tank is lower than that of the phase change materials in the heat storage tank.
Further, the phase change material filled in the cold storage tank has a phase change temperature in the range of-20 ℃ to 8 ℃;
the phase change material filled in the heat storage tank has a phase change temperature in the range of 40 ℃ to 80 ℃.
Further, the heat exchange medium filled in the energy storage circulation loop adopts inorganic compounds, halogenated hydrocarbons, hydrocarbon or mixed refrigerant.
Further, the low boiling point medium filled in the power generation circulation loop adopts chloroethane, n-butane, isobutane, freon-11 or freon-12.
The temperature difference energy storage power generation system realizes the energy storage power generation efficiency based on the temperature difference energy storage form, thereby creating a brand-new energy storage power generation mode; the temperature difference energy storage power generation system has stable power generation efficiency, low price, no environmental hazard, simple and compact structure and small occupied area, can solve the requirements of various types of energy storage and power supply, and provides technical support of a brand new way for full and reasonable application of green energy.
Drawings
Fig. 1 is a schematic diagram of a thermoelectric energy storage power generation system according to the present invention.
Detailed Description
The invention is further illustrated by the following specific examples:
referring to fig. 1, the present embodiment provides a thermoelectric energy storage power generation system mainly including a cold storage tank 1, a heat storage tank 2, a heat transfer device 3, and a thermoelectric power generation device 4.
The basic structures of the cold storage tank 1 and the heat storage tank 2 are the same, the interiors of the cold storage tank 1 and the heat storage tank 2 are filled with phase change materials, the difference between the two is that the adopted phase change materials are different,
filled in the cold storage tank 1 is a low temperature phase change material suitable for storing cold energy, such as NaNO 3 Aqueous solution, NH 4 NO 3 Aqueous solution, NH 4 Aqueous Cl solution and NaS 2 O 3 Aqueous solution, SMU-7, diethylene glycol C 4 H 10 O 3 Tridecane C 13 H 28 A low temperature phase change material;
filled in the heat storage tank 2 is a high temperature phase change material suitable for storing thermal energy, such as paraffin C 20 ～C 33 、Ca(NO 3 ) 2 ·4H 2 O、MgSO 4 ·7H 2 O, RT50, SMU-2, myristic acid and other high temperature phase change materials.
Preferably, the phase change material filled in the cold storage tank 1 has a phase change temperature selected in the range of-20 ℃ to 8 ℃; the phase change material filled in the heat storage tank 2 may have a phase change temperature selected in a range of 40 to 80 ℃.
The "phase transition temperature of the phase transition material in the heat storage tank 1" should be lower than the "phase transition temperature of the phase transition material in the heat storage tank 2", and the larger the temperature difference therebetween, the better.
It should be noted that the phase change material has the advantages of larger phase change latent heat, constant temperature during phase change, lower price, no harm to environment, etc., and during working, the two phase change materials can store and release a large amount of cold energy and heat energy to provide enough temperature difference to generate electricity. And due to the constant temperature characteristic of the phase change material in the phase change process, the cold and heat sources in the system can be stabilized, so that the temperature difference is kept constant, and the electric quantity is stably output.
Whether the cold storage tank 1 or the heat storage tank 2 is provided with two independent heat exchange pipelines 5, the two independent heat exchange pipelines 5 are respectively arranged for the heat transfer device 3 and the thermoelectric generation device 4. The heat exchange pipelines 5 in the cold storage tank 1 and the heat storage tank 2 are fully contacted with the phase change materials in the cold storage tank and the heat storage tank.
For convenience of description, the two independent heat exchange pipelines 5 are respectively referred to as an energy storage heat exchange pipeline and a power generation heat exchange pipeline.
The heat transfer device 3 is arranged between the cold storage tank 1 and the heat storage tank 2, and specifically comprises a compressor 31, an evaporator 32 and a condenser 33. The compressor 31, the evaporator 32 and the condenser 33 are connected in series by pipes to form a circulation circuit, which is called an energy storage circulation circuit, in which a large amount of heat exchange medium is filled.
Preferably, the heat exchange medium may be an inorganic compound, a halogenated hydrocarbon, a mixed refrigerant, other hydrocarbons, or the like.
The evaporator 32 is assembled and connected with an energy storage heat exchange pipeline in the cold storage tank 1 to form an evaporation heat absorption loop;
the condenser 33 is assembled and connected with an energy storage heat exchange pipeline in the heat storage tank 2 to form a condensation heat release loop.
It should be noted that the specific assembly connection form of the evaporator 32 and the heat exchange line is common knowledge of those skilled in the art.
In summary, the heat transfer device 3 essentially functions as a heat pump, and is driven by the compressor 31, or driven by surplus power, to extract and transfer the heat energy in the heat storage tank 1 to the heat storage tank 2, or may be reversely understood as "extracting and transferring the cold energy in the heat storage tank 2 to the heat storage tank 1", so as to increase the heat quantity difference between the heat storage tank 1 and the heat storage tank 2, thereby achieving the effect of energy storage by using the temperature difference of the phase change material.
In order to control the flow of the heat exchange medium in the energy storage circulation loop conveniently, a throttle valve is arranged on the energy storage circulation loop.
The thermoelectric generation device 4 is arranged between the cold storage tank 1 and the heat storage tank 2, and specifically comprises a circulating pump 41, an expander 42 and a generator 43.
The power generation heat exchange pipeline of the cold storage tank 1 and the power generation heat exchange pipeline of the heat storage tank 2 are connected through two pipelines to form a circulation loop, the circulation loop is called a power generation circulation loop, and a large amount of low-boiling-point medium is filled in the power generation circulation loop.
Preferably, the low boiling point medium may be ethyl chloride, n-butane, isobutane, freon-11 or freon-12, etc.
The circulation pump 41 and the expander 42 are both provided on the power generation circulation circuit, wherein the circulation pump 41 functions to drive the low boiling point medium in the power generation circulation circuit to circulate. More specifically, the circulation pump 41 is typically disposed on a cold-hot flow path section, and the circulation pump 41 drives the medium in the section where it is located from the cold storage tank 1 to the heat storage tank 2.
The expander 42 is disposed on the hot and cold flow pipe section.
It should be noted that, the above-mentioned "hot and cold flow pipe section" means: the flow direction of the internal medium is a pipe section flowing from the heat storage tank 2 to the cold storage tank 1; the above-mentioned "cold and hot flow direction pipe section" means: the flow direction of the internal medium is a pipe section flowing from the cold storage tank 1 to the heat storage tank 2.
The generator 43 is assembled with the expander 42, and the generator 43 is driven by the expander 42.
The whole working process of the thermoelectric generation device 4 is as follows:
the circulating pump 41 drives low-boiling-point medium in the power generation circulating loop to circularly flow, and the circulating pump 41 drives medium in the pipe section where the circulating pump 41 is positioned to flow from the cold storage tank 1 to the heat storage tank 2; the liquid low-boiling-point medium entering the heat storage tank 2 from the cold storage tank 1 is gasified into a gas state after being heated, and an expansion effect is generated, when the expanded gas reaches the expansion machine 42, blades in the expansion machine 42 are pushed to rotate for doing work, the expansion machine 42 operated drives the generator 43 to generate electric power, and the electric power enters the cold storage tank 1 again through the low-boiling-point medium after the expansion machine 42 for cooling and liquefying. The above process is repeated, so that the pre-stored temperature difference potential energy between the cold storage tank 1 and the heat storage tank 2 can be converted into electric energy, or the temperature difference between the two is utilized to generate electricity, thereby realizing the effect of energy storage and electricity generation.
In general, in the thermoelectric energy storage power generation system of the present embodiment, the cold storage tank 1 and the heat storage tank 2 are combined together to form an energy storage device capable of storing thermoelectric potential energy; the heat transfer device 3 is used for converting surplus electric power into temperature difference potential energy and storing the surplus electric power by combining the cold storage tank 1 and the heat storage tank 2; the thermoelectric generation device 4 is used for converting the thermoelectric potential energy stored by the cold storage tank 1 and the heat storage tank 2 into electric energy for supplying power.
It should be noted that, the thermoelectric energy storage power generation system of the present embodiment may be used in the following scenarios: the valley electricity is converted into the cold energy and the heat energy of the phase change material at night to be stored for the electricity output in peak electricity period, and the surplus new energy sources such as wind power and photoelectric conversion are utilized to be stored into the cold energy and the heat energy of the phase change material to be output when needed.
The thermoelectric energy storage power generation system of the embodiment realizes the energy storage power generation efficiency in the mode of storing thermoelectric potential energy in advance and then generating power by utilizing the thermoelectric potential energy, thereby creating a brand-new energy storage power generation mode. The temperature difference potential energy storage power generation mode realized by the embodiment has the following advantages:
1. the phase change materials adopted in the cold storage tank 1 and the heat storage tank 2 have the advantages of larger phase change latent heat, constant temperature during phase change, lower price, no harm to the environment and the like, and the cold and heat sources in the temperature difference energy storage power generation system can be stable due to the constant temperature characteristic of the phase change materials in the phase change process so as to maintain constant temperature difference and stably output electric quantity.
2. In the temperature difference energy storage power generation system of the embodiment, the vapor compression is skillfully utilized for refrigeration and heating, so that the problems of a cold source and a heat source are solved.
3. The temperature difference energy storage power generation system of the embodiment has wide application range and is not limited by geographic positions and environments. As long as there is electric energy input, phase change energy storage can be carried out through vapor compression, and electricity is used for output when needed.
4. In the temperature difference energy storage power generation system of the embodiment, the heat transfer device 3 and the temperature difference power generation device 4 can operate independently to realize the cross-time and cross-place output of electric energy, and the phase change energy storage can be carried out through vapor compression in a certain period of time, and the electric energy output of temperature difference expansion is carried out in another period of time; the phase change energy storage can be carried out by vapor compression in one area, and the electric energy output of temperature difference expansion can be carried out in the other area.
5. The temperature difference energy storage power generation system of the embodiment has compact structure and small occupied area, can be repeatedly combined and used by multiple systems, and solves the requirements of large-scale energy storage and power supply.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention, therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a temperature difference energy storage power generation system which characterized in that: the temperature difference energy storage power generation system comprises a cold storage tank (1), a heat storage tank (2), a heat transfer device (3) and a temperature difference power generation device (4);
the heat transfer device (3) is used for transferring heat energy in the cold storage tank (1) into the heat storage tank (2) under electric drive;
the thermoelectric power generation device (4) is used for generating power by utilizing the temperature difference between the cold storage tank (1) and the heat storage tank (2).
2. The thermoelectric energy storage power generation system of claim 1, wherein: an energy storage heat exchange pipeline and a power generation heat exchange pipeline are arranged in the cold storage tank (1) and the heat storage tank (2);
the heat transfer device (3) comprises a compressor (31), an evaporator (32) and a condenser (33); the compressor (31), the evaporator (32) and the condenser (33) are connected in series through pipelines to form an energy storage circulation loop, and the energy storage circulation loop is filled with heat exchange medium; the evaporator (32) is connected with an energy storage heat exchange pipeline in the cold storage tank (1) in an assembling way, and the condenser (33) is connected with an energy storage heat exchange pipeline in the heat storage tank (2) in an assembling way;
the power generation heat exchange pipeline of the cold storage tank (1) is connected with the power generation heat exchange pipeline of the heat storage tank (2) through a pipeline to form a power generation circulation loop, and the power generation circulation loop is filled with low-boiling-point medium;
the thermoelectric generation device (4) comprises a circulating pump (41), an expander (42) and a generator (43); the circulating pump (41) and the expander (42) are both arranged on the power generation circulating loop, the circulating pump (41) drives a medium in a pipe section where the circulating pump is positioned to flow from the cold storage tank (1) to the heat storage tank (2), and the expander (42) is arranged on a hot-cold flow pipe section; the generator (43) is driven by an expander (42).
3. The thermoelectric energy storage power generation system of claim 1, wherein: the cold storage tank (1) and the heat storage tank (2) are filled with phase change materials, and the phase change temperature of the phase change materials in the cold storage tank (1) is lower than that of the phase change materials in the heat storage tank (2).
4. A thermoelectric energy storage power generation system as set forth in claim 3 wherein: the phase change material filled in the cold storage tank (1) has a phase change temperature in the range of-20 ℃ to 8 ℃;
the phase change material filled in the heat storage tank (2) has a phase change temperature in the range of 40 ℃ to 80 ℃.
5. The thermoelectric energy storage power generation system of claim 2, wherein: and the heat exchange medium filled in the energy storage circulation loop adopts inorganic compounds, halogenated hydrocarbons, hydrocarbon or mixed refrigerant.
6. The thermoelectric energy storage power generation system of claim 2, wherein: and the low-boiling point medium filled in the power generation circulation loop adopts chloroethane, normal butane, isobutane, freon-11 or freon-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311814936.3A CN117728713A (en) | 2023-12-27 | 2023-12-27 | Thermoelectric energy storage power generation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311814936.3A CN117728713A (en) | 2023-12-27 | 2023-12-27 | Thermoelectric energy storage power generation system |
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| Publication Number | Publication Date |
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| CN117728713A true CN117728713A (en) | 2024-03-19 |
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| CN202311814936.3A Pending CN117728713A (en) | 2023-12-27 | 2023-12-27 | Thermoelectric energy storage power generation system |
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| CN (1) | CN117728713A (en) |
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- 2023-12-27 CN CN202311814936.3A patent/CN117728713A/en active Pending
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