CN113691218A - Photovoltaic temperature difference power generation combined energy storage system with chemical upgrading and heat storage functions - Google Patents
Photovoltaic temperature difference power generation combined energy storage system with chemical upgrading and heat storage functions Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/40—Thermal components
- H02S40/42—Cooling means
- H02S40/425—Cooling means using a gaseous or a liquid coolant, e.g. air flow ventilation, water circulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/20—Arrangements for storing heat collected by solar heat collectors using chemical reactions, e.g. thermochemical reactions or isomerisation reactions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
- H02N11/002—Generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/20—Systems characterised by their energy storage means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/40—Thermal components
- H02S40/44—Means to utilise heat energy, e.g. hybrid systems producing warm water and electricity at the same time
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/60—Thermal-PV hybrids
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
A photovoltaic temperature difference power generation combined energy storage system based on chemical upgrading and heat storage belongs to the technical field of energy storage. The system comprises a photovoltaic temperature difference power generation and generation subsystem and a chemical quality-improving and heat-accumulating subsystem. The system has the functions of solar energy utilization, medium and low temperature heat energy upgrading, medium and high temperature heat energy storage, medium and high temperature heat energy release and the like, and can obviously improve the temperature of the hot end conduction surface of the thermoelectric cell, thereby improving the power generation power of the thermoelectric cell and having good economic benefit.
Description
Technical Field
The invention relates to a photovoltaic temperature difference power generation combined energy storage system with chemical upgrading and heat storage functions, and belongs to the technical field of energy storage.
Background
Solar energy is one of renewable energy sources which is widely applied. The utilization mode of solar energy comprises photovoltaic power generation, photo-thermal utilization and the like. The main principle of photovoltaic power generation is to utilize the photoelectric effect of semiconductors. At present, although photovoltaic power generation is widely applied, the photovoltaic power generation efficiency is greatly influenced by temperature, and when the temperature is too high, the photovoltaic power generation efficiency is remarkably reduced. If the photovoltaic cell panel is cooled, the generated low-grade heat energy is generally difficult to directly utilize due to low temperature, and the direct discharge causes great energy loss and thermal pollution.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a photovoltaic temperature difference power generation combined energy storage system with chemical quality and heat improvement and heat storage. According to the system, while photovoltaic power generation is realized, the temperature of the photovoltaic cell panel is reduced by using the cooling medium, high photovoltaic power generation efficiency is guaranteed, the cooling medium subjected to temperature rise is subjected to secondary quality improvement through the solar thermal collector and the chemical quality-improving heat-storage subsystem, and finally the temperature difference battery is driven by using the high-grade heat energy subjected to quality improvement, so that the power generation power of the temperature difference battery is improved.
The technical scheme of the invention is as follows:
the utility model provides a take chemistry to upgrade photovoltaic thermoelectric generation of heat accumulation and unite energy storage system which characterized in that: the system of the invention is composed of a photovoltaic temperature difference power generation and generation system and a chemical quality-improving and heat-storing subsystem; the photovoltaic temperature difference power generation subsystem comprises a solar energy utilization unit and a temperature difference power generation unit; the solar energy utilization unit is mainly responsible for converting solar energy into electric energy and heat energy, and the temperature difference power generation unit is mainly used for converting the upgraded heat energy into electric energy; the chemical upgrading heat storage subsystem comprises a chemical heat pump upgrading unit and a medium-high temperature heat storage unit. The chemical heat pump upgrading unit finishes a medium-low temperature waste heat storage process, and then the medium-high temperature heat storage unit finishes a medium-high temperature grade heat energy storage process.
The utility model provides a take chemistry to upgrade photovoltaic thermoelectric generation of heat accumulation and unite energy storage system which characterized in that: the chemical upgrading heat storage subsystem comprises a chemical heat pump upgrading unit and a medium-high temperature heat storage unit; the chemical heat pump upgrading unit comprises an endothermic reaction device, a rectifying tower, a separation device, a heat regenerator and a medium-high temperature grade heat energy storage device, wherein reaction raw materials based on a chemical heat storage principle are filled in the endothermic reaction device, and can generate forward endothermic reaction in a low-temperature environment (reverse reaction in a high-temperature environment, and the reverse reaction is exothermic reaction); the medium-high temperature heat storage unit comprises a medium-high temperature grade heat energy storage device, a medium-high temperature heat storage device, a medium-high temperature resultant storage tank, a valve and a gas compressor; reaction raw materials based on the chemical heat storage principle are filled in the medium-high temperature grade heat energy storage device, and the reaction raw materials can perform a forward endothermic reaction (a reverse reaction is an exothermic reaction); the photovoltaic temperature difference power generation subsystem comprises a solar energy utilization unit and a temperature difference power generation unit, wherein the temperature difference power generation unit comprises a temperature difference battery and a storage battery, and the solar energy utilization unit comprises a parabolic condenser, a photovoltaic battery and a solar vacuum heat collector.
The utility model provides a take chemistry to upgrade photovoltaic thermoelectric generation of heat accumulation and unite energy storage system which characterized in that: the solar energy utilization unit, the chemical heat pump upgrading unit, the medium-high temperature heat storage unit and the temperature difference power generation unit are sequentially connected in series. During photovoltaic power generation, the low-grade heat energy generated by maintaining the efficiency of the photovoltaic power generation system is subjected to secondary quality improvement through the solar thermal collector and the chemical quality-improving heat storage subsystem, and finally the high-grade heat energy subjected to quality improvement is used for driving the thermoelectric cell, so that the power generation power is improved.
A photovoltaic temperature difference power generation combined energy storage system with chemical upgrading and heat storage has the following equipment connection characteristics:
in the chemical upgrading heat storage subsystem, a reaction raw material-reaction product outlet of the endothermic reaction device is connected with a reaction raw material-reaction product inlet of the rectifying tower and a reaction raw material-reaction product inlet of the separating device sequentially through pipelines; the reaction product outlet of the separation device is connected with the inlet of the internal reactor pipeline of the medium-high temperature grade heat energy storage device through the reaction product channel of the heat regenerator by a pipeline; an outlet of an internal reactor pipeline of the medium-high temperature grade heat energy storage device is connected with a reaction raw material inlet of the endothermic reaction device through a reaction raw material channel of the heat regenerator by a pipeline; a reaction raw material outlet of the separation device is connected with a reaction raw material inlet of the rectifying tower through a pipeline; and a reaction raw material outlet of the rectifying tower is connected with a reaction raw material inlet of the endothermic reaction device through a pipeline.
In the chemical upgrading heat storage subsystem, a reaction product outlet of a medium-high temperature grade heat energy storage device of a medium-high temperature heat storage unit is connected with a heat source inlet of the medium-high temperature heat storage device through a pipeline; a heat source outlet of the medium-high temperature heat storage device is connected with an inlet of the gas compressor through a pipeline; the outlet of the compressor is connected with the inlet of the medium-high temperature product storage tank through a pipeline; the outlet of the medium-high temperature resultant storage tank is connected with the medium-high temperature reaction product inlet of the medium-high temperature heat storage device through a pipeline; and a medium-high temperature reaction product outlet of the medium-high temperature heat storage device is connected with a reaction product inlet of the medium-high temperature grade heat energy storage device through a pipeline.
In the photovoltaic temperature difference power generation subsystem, the back of a concentrating solar photovoltaic cell panel in a solar energy utilization unit is connected with a water source through a pipeline; the outlet of the pipeline at the back of the photovoltaic cell is connected with the inlet of the solar vacuum heat collector through a pipeline; the photovoltaic cell and the thermoelectric cell are connected with the storage battery through leads; an internal heat exchanger is arranged in the medium-high temperature grade heat energy storage device, and an outlet of the internal heat exchanger is connected with the hot end of the thermoelectric cell through a pipeline; the cold end conduction surface and the hot end conduction surface of the thermoelectric cell are formed by connecting a plurality of semiconductor power generation modules;
a photovoltaic temperature difference power generation combined energy storage system with chemical upgrading and heat storage is characterized by comprising the following steps:
in the time period when the solar illumination is sufficient, the concentrating solar photovoltaic cell absorbs the solar power generation, the temperature of the photovoltaic cell panel affected by the solar illumination is increased, cooling water is introduced into a heat exchange pipeline arranged on the back of the photovoltaic cell panel for ensuring the photovoltaic power generation efficiency, and the cooling water after the heat exchange is completed is sent into the solar vacuum heat collector to be further heated.
In the chemical heat pump upgrading unit, water heated by the solar vacuum heat collector enters an internal heat exchanger of the endothermic reaction device for heat exchange, the heat of the water is absorbed by reaction raw materials in the endothermic reaction device, the temperature of the water is reduced and the water is discharged after the heat exchange is finished, the reaction raw materials in the endothermic reaction device absorb heat and are heated, a forward endothermic reaction is carried out at a proper temperature and pressure, and reaction products and part of unreacted reaction raw materials are conveyed to the rectifying tower; in the rectifying tower, the reaction product and the reaction raw material are separated according to the difference of the boiling points of the reaction product and the reaction raw material, most of the reaction raw material with higher boiling point is left in the rectifying tower and then is discharged back to the endothermic reaction device, and the reaction product with certain temperature and lower boiling point and a small amount of the reaction raw material are discharged out of the rectifying tower and enter the separating device; in the separation device, further separating the reaction raw materials and the reaction products to obtain high-purity reaction products, returning the separated reaction raw materials to the rectifying tower, and feeding the high-purity reaction products into a heat regenerator; in the heat regenerator, the high-purity reaction product absorbs heat and is heated, and then enters an internal reactor pipeline of a medium-high temperature grade heat energy storage device; in the internal reactor pipeline of the medium-high temperature grade heat energy storage device, high-purity reaction products are subjected to reverse exothermic reaction at proper temperature and pressure, the released heat is absorbed by reaction raw materials filled outside the internal reactor pipeline of the medium-high temperature grade heat energy storage device, and meanwhile, reaction raw materials with certain temperature and unreacted reaction products generated by the reverse exothermic reaction are conveyed to a heat regenerator; in the heat regenerator, reaction raw materials and unreacted reaction products with certain temperature exchange heat with high-purity reaction products from the separation device, and after the heat exchange is finished, the reaction raw materials and the unreacted reaction products with certain temperature are cooled and conveyed to the endothermic reaction device, so that the quality improvement cycle process of medium-low temperature grade heat energy is finished.
In the medium-high temperature heat storage unit, reaction raw materials filled outside an internal reactor pipeline of the medium-high temperature grade heat energy storage device absorb heat and then are heated, forward endothermic reaction is carried out at proper temperature and pressure, reaction products comprise solid, gaseous or liquid products, then the products are separated according to the difference of the phase state and density of the products, the solid products with high density are left in the medium-high temperature grade heat energy storage device, and the gaseous or liquid products with certain temperature and low density are discharged out of the medium-high temperature grade heat energy storage device under the suction action of the compressor; the gas or liquid product with certain temperature and low density is heat exchanged via the medium-high temperature heat storage device, the heat is stored in the medium-high temperature heat storage device, and after the heat exchange is finished, the gas or liquid product is sent to the medium-high temperature product storage tank via the compressor to be stored, so that the medium-high temperature heat energy storage process is finished.
When the power load is in tension, the medium-high temperature heat storage unit converts the chemical energy stored in the medium-high temperature heat storage unit into heat energy and outputs the heat energy. Gaseous or liquid resultant in the medium-high temperature resultant storage tank is discharged, heat exchange is carried out through the medium-high temperature heat storage device, the gaseous or liquid resultant is preheated to a certain temperature and then enters the medium-high temperature grade heat energy storage device, reverse heat release reaction is carried out on the gaseous or liquid resultant and original solid resultant in the medium-high temperature grade heat energy storage device at a proper temperature and pressure, the discharged heat is absorbed by a heat conducting medium through an internal heat exchanger of the medium-high temperature grade heat energy storage device, the heat conducting medium is preheated to a certain temperature, the heat conducting medium with a certain temperature enters a hot end conducting surface of the thermoelectric cell for heat exchange, radiating fins are arranged on the cold end conducting surface of the thermoelectric cell, and the hot end conducting surface of the thermoelectric cell and the cold end conducting surface of the thermoelectric cell form a large temperature difference for power generation.
The invention has the following advantages and prominent technical effects:
1. the system disclosed by the invention utilizes cold water to cool the back of the photovoltaic cell, improves the power generation efficiency, effectively utilizes waste heat generated by the photovoltaic cell panel, and improves the medium-low temperature heat energy based on a chemical quality-improving and heat-storing principle.
2. The system has the functions of solar energy utilization, medium and low temperature heat energy upgrading, medium and high temperature heat energy storage, medium and high temperature heat energy release and the like, and simultaneously heats the heat-conducting medium of the hot end conducting surface of the thermoelectric cell by using the upgraded low-grade heat energy, so that the temperature of the hot end conducting surface of the thermoelectric cell is obviously improved, the power generation power of the thermoelectric cell is improved, and the system has good economic benefit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without any creative effort.
FIG. 1 shows a photovoltaic temperature difference power generation combined energy storage system with chemical upgrading and heat storage provided by the invention.
The list of labels in the figure is: 1-a storage battery; 2-a parabolic concentrator; 3-a photovoltaic cell; 4-a thermoelectric cell; 5-solar vacuum heat collector; 6-endothermic reaction device; 7-a rectifying tower; 8-a separation device; 9-a heat regenerator; 10-a medium-high temperature grade heat energy storage device; 11-medium-high temperature heat storage device; 12-medium and high temperature product storage tank; 13-a valve; a, an air compressor; b, C-internal heat exchanger.
Detailed Description
The utility model provides a take chemistry to upgrade photovoltaic thermoelectric generation of heat accumulation and unite energy storage system which characterized in that: the system consists of a photovoltaic temperature difference power generation and generation system and a chemical quality-improving and heat-accumulating subsystem. The photovoltaic temperature difference power generation subsystem comprises a solar energy utilization unit and a temperature difference power generation unit. The photovoltaic temperature difference power generation subsystem comprises a solar energy utilization unit and a temperature difference power generation unit. The solar energy utilization unit converts solar energy into electric energy and heat energy and stores the electric energy in the storage battery; the temperature difference power generation unit mainly converts the upgraded heat energy into electric energy, and the electric energy is also stored in the storage battery; the chemical upgrading and heat accumulating subsystem comprises a chemical heat pump upgrading unit and a medium-high temperature heat accumulating unit, wherein the chemical heat pump upgrading unit finishes a medium-low temperature waste heat storing process, and then the medium-high temperature heat accumulating unit finishes a medium-high temperature grade heat energy storing process.
The chemical upgrading heat storage subsystem is characterized in that: the chemical upgrading heat storage subsystem comprises a chemical heat pump upgrading unit and a medium-high temperature heat storage unit. The chemical heat pump upgrading unit comprises an endothermic reaction device 6, a rectifying tower 7, a separation device 8, a heat regenerator 9 and a medium-high temperature grade heat energy storage device 10, wherein reaction raw materials based on a chemical heat storage principle are filled in the endothermic reaction device 6, and the reaction raw materials can generate a forward endothermic reaction (a reverse reaction which is an exothermic reaction) in a low-temperature environment; the medium-high temperature heat storage unit comprises a medium-high temperature grade heat energy storage device 10, a medium-high temperature heat storage device 11, a medium-high temperature product storage tank 12, a valve 13 and a gas compressor A, wherein reaction raw materials based on a chemical heat storage principle are filled in the medium-high temperature grade heat energy storage device 10, and the reaction raw materials can perform a forward endothermic reaction (a reverse reaction is an exothermic reaction).
The chemical heat pump quality improving unit of the chemical quality improving and heat accumulating subsystem is characterized in that: a reaction raw material-reaction product outlet 6a of the endothermic reaction device 6 is connected with a reaction raw material-reaction product inlet 7a of the rectifying tower 7 through a pipeline; a reaction raw material outlet 7d of the rectifying tower 7 is connected with a reaction raw material inlet 6c of the endothermic reaction device 6 through a pipeline, and a reaction raw material-reaction product outlet 7b of the rectifying tower 7 is connected with a reaction raw material-reaction product inlet 8a of the separation device 8 through a pipeline; a reaction product outlet 8b of the separation device 8 is connected with a reaction product inlet 9a of the heat regenerator 9 through a pipeline, and a reaction raw material outlet 8c of the separation device 8 is connected with a reaction raw material inlet 7c of the rectifying tower 7 through a pipeline; a reaction raw material outlet 9d of the heat regenerator 9 is connected with a reaction raw material inlet 6b of the endothermic reaction device 6 through a pipeline, and a reaction product outlet 9b of the heat regenerator 9 is connected with an internal reactor pipeline inlet 10a of the medium-high temperature grade heat energy storage device 10 through a pipeline; an outlet 10b of the internal reactor pipeline of the medium-high temperature grade heat energy storage device 10 is connected with a reaction raw material inlet 9c of the heat regenerator 9 through a pipeline.
The medium-high temperature heat storage unit of the chemical upgrading heat storage subsystem is characterized in that: a reaction product outlet 10d of the medium-high temperature grade heat energy storage device 10 is connected with a heat source inlet 11c of the medium-high temperature heat storage device 11 through a pipeline; a heat source outlet 11d of the medium-high temperature heat storage device 11 is connected with an inlet of the compressor A through a pipeline; the outlet of the compressor A is connected with the inlet of the medium-high temperature product storage tank 12 through a pipeline; the outlet of the medium-high temperature resultant storage tank 12 is connected with the medium-high temperature reaction product inlet 11b of the medium-high temperature heat storage device 11 through a pipeline and a valve 13; and a medium-high temperature reaction product outlet 11a of the medium-high temperature heat storage device 11 is connected with a reaction product inlet 10c of the medium-high temperature grade heat energy storage device 10 through a pipeline.
The photovoltaic temperature difference power generation subsystem comprises a solar energy utilization unit and a temperature difference power generation unit, wherein the solar energy utilization unit comprises a photovoltaic cell 3, a parabolic concentrator 2 and a solar vacuum heat collector 5; the thermoelectric generation unit includes a secondary battery 1 and a thermoelectric cell 5.
The photovoltaic temperature difference power generation subsystem is characterized in that: an outlet of an internal heat exchanger B of the medium-high temperature grade heat energy storage device 10 is connected with a hot end conduction surface inlet 4a of the thermoelectric cell through a pipeline; the outlet 4B of the hot end conducting surface of the thermoelectric cell is connected with the inlet of the internal heat exchanger B through a pipeline; the cold end of the thermoelectric cell is provided with a radiating fin, and a heat-conducting silicone grease layer is arranged between the thermoelectric cell and the radiating fin; the outlet 2b of the photovoltaic cell back pipeline is connected with the inlet 5a of the solar vacuum heat collector; the outlet 5b of the solar vacuum heat collector 5 is connected with the inlet of the internal heat exchanger C of the endothermic reaction device 6; the photovoltaic cell 2 and the thermoelectric cell 4 are respectively connected with the storage battery 1.
A photovoltaic temperature difference combined energy storage system with chemical upgrading and heat storage is characterized by comprising the following steps:
firstly, in a time period when the solar illumination is sufficient, the concentrating solar photovoltaic cell absorbs the solar energy for power generation, meanwhile, the temperature of the photovoltaic cell 3 is increased under the influence of the solar illumination, in order to ensure the photovoltaic power generation efficiency, cooling water is introduced into a heat exchange pipeline arranged on the back surface of the photovoltaic cell 3, the photovoltaic cell 3 absorbs the light energy for power generation, the cooling water cools the photovoltaic cell 3, the temperature of the outlet water of the heat exchange pipeline arranged on the back surface of the photovoltaic cell 3 is about 50 ℃, then the outlet water enters a solar vacuum heat collector 5 for heat absorption, the water absorbs the heat to about 90 ℃ and enters an internal heat exchanger C of an endothermic reaction device 6 for heat exchange, after the heat exchange, the temperature is reduced, and the water can be used for heating.
In the chemical heat pump upgrading unit, a chemical heat storage medium in an endothermic reaction device 6 is liquid isopropanol, water at about 90 ℃ from a solar vacuum heat collector 5 enters an internal heat exchanger C of the endothermic reaction device 6 for heat exchange, the heat of the water at about 90 ℃ is absorbed by the chemical heat storage medium (liquid isopropanol) in the endothermic reaction device 6, the liquid isopropanol in the endothermic reaction device 6 absorbs heat, is heated and evaporated, and then undergoes forward endothermic decomposition reaction at about 85 ℃, and the catalyst is a ZnO/CuO composite catalyst, and the reaction formula is as follows:
(CH3)2CHOH(l)→(CH3)2CHOH(g) ΔH＝45.4kJ/mol
(CH3)2CHOH(g)→(CH3)2CO(g)+H2(g) ΔH＝55.0kJ/mol
reacting to generate acetone and hydrogen at about 85 ℃, and then feeding the mixed gas of the acetone and the hydrogen at about 85 ℃ and part of unreacted gaseous isopropanol into a rectifying tower 7; in the rectifying tower 7, most of the gaseous isopropanol is condensed and liquefied according to the difference of the boiling points of the mixed gas of acetone and hydrogen and the gaseous isopropanol so as to be separated from the mixed gas of acetone and hydrogen, the liquid isopropanol obtained by condensation and liquefaction is then discharged back to the endothermic reaction device 6, the mixed gas of hydrogen and acetone at the temperature of about 80 ℃ and a small amount of gaseous isopropanol which is not condensed and liquefied are discharged out of the rectifying tower 7 and enter a separation device 8; in the separation device 8, the residual gaseous isopropanol is separated and returned to the rectifying tower 7, and simultaneously the mixed gas of high-purity acetone and hydrogen at the temperature of about 80 ℃ is obtained, and then the mixed gas of high-purity acetone and hydrogen at the temperature of about 80 ℃ enters a heat regenerator 9; in the heat regenerator 9, the mixed gas of high-purity acetone and hydrogen at the temperature of about 80 ℃ absorbs heat, the temperature is raised to about 200 ℃, and then the mixed gas enters an internal reactor pipeline of the medium-high temperature grade heat energy storage device 10; the chemical heat storage medium in the medium-high temperature grade heat energy storage device 10 is hydrogen storage alloy Mg2NiH 4; solid catalyst Raney nickel (Raney Ni) is filled in an internal reactor pipeline of the medium-high temperature grade heat energy storage device 10, a mixed gas of high-purity acetone and hydrogen at about 200 ℃ is catalyzed by the solid catalyst Raney nickel (Raney Ni) to generate a reverse exothermic chemical combination reaction, gaseous isopropanol at about 250 ℃ is generated by the reaction, and the reaction formula is as follows:
(CH3)2CO(g)+H2(g)→(CH3)2CHOH(g) ΔH＝-55.0kJ/mol
the heat released by the reaction is filled with the reaction source outside the internal reactor pipe of the medium-high temperature grade thermal energy storage device 10Hydrogen-storage alloy Mg2NiH4Absorbing, and then discharging the gaseous isopropanol at about 250 ℃ and the mixed gas of unreacted hydrogen and acetone back to the heat regenerator 9; in the heat regenerator 9, the gaseous isopropanol at about 250 ℃, the unreacted hydrogen and the acetone exchange heat with the mixed gas of the high-purity acetone and the hydrogen at about 80 ℃ from the separation device 8, after the heat exchange is completed, the temperature of the gaseous isopropanol at about 250 ℃, the unreacted hydrogen and the mixed gas of the acetone is reduced to about 80 ℃ and returns to the endothermic reaction device 6, so that the medium-low temperature grade heat energy upgrading process is completed.
In the medium-high temperature heat storage unit, the reactant Mg is filled outside the internal reactor pipeline of the medium-high temperature grade heat energy storage device 102NiH4After absorbing heat, the temperature is gradually increased, and a forward endothermic decomposition reaction occurs at a temperature of about 240 ℃, and the reaction formula is as follows:
Mg2NiH4(s)→Mg2Ni(s)+2H2(g) ΔH＝65kJ/mol
hydrogen gas with the temperature of about 240 ℃ is generated through reaction, and then the hydrogen gas with the temperature of about 240 ℃ is exhausted out of the medium-high temperature heat energy storage device 10 under the suction action of the compressor A and enters the medium-high temperature heat storage device 11; the hydrogen gas at about 240 ℃ is subjected to heat exchange through the medium-high temperature heat storage device 11, the heat of the hydrogen gas at about 240 ℃ is stored in the medium-high temperature heat storage device 11, after the heat exchange is completed, the temperature of the hydrogen gas at about 240 ℃ is reduced, and then the hydrogen gas is sent to the medium-high temperature product storage tank 12 through the air compressor A to be stored, so that the medium-high temperature grade heat energy storage process is completed.
During peak load of electricity consumption, in the medium-high temperature heat storage unit, the hydrogen stored in the medium-high temperature product storage tank 12 before is released and enters the medium-high temperature heat storage device 11 for heat exchange, after the heat exchange is completed, the hydrogen is preheated to about 220 ℃ and enters the medium-high temperature grade heat energy storage device 10, and the hydrogen and the original solid product Mg are generated at about 220 ℃ under the condition of the temperature of about 220 DEG C2Ni is subjected to reverse combination exothermic reaction, and the reaction formula is as follows:
Mg2Ni(s)+2H2(g)→Mg2NiH4(s) ΔH＝-65kJ/mol
the released heat is absorbed by the heat conducting oil THERMINOL 66 through the heat exchanger B, the temperature of the heat conducting oil THERMINOL 66 rises to about 210 ℃ and enters the hot end conducting surface of the thermoelectric cell 4, the cold end of the thermoelectric cell 4 is provided with radiating fins to form temperature difference with the high-temperature heat conducting oil on the hot end conducting surface, and power is generated by utilizing the temperature difference. Thereby completing the process of releasing and utilizing the heat energy at medium and high temperature.
Finally, the above embodiments are only used to help understand the method of the present invention and its core idea; also, for those skilled in the art, variations can be made in the specific embodiments and applications without departing from the spirit of the invention. In view of the foregoing, the present specification should not be construed as limiting the present invention.
Claims (3)
1. The utility model provides a take chemistry to upgrade photovoltaic thermoelectric generation of heat accumulation and unite energy storage system which characterized in that: the system of the invention is composed of a photovoltaic temperature difference power generation and generation system and a chemical quality-improving and heat-storing subsystem; the photovoltaic temperature difference power generation subsystem comprises a solar energy utilization unit and a temperature difference power generation unit; the solar energy utilization unit converts solar energy into electric energy and heat energy, and the temperature difference power generation unit mainly converts the upgraded heat energy into electric energy; the chemical upgrading heat storage subsystem comprises a chemical heat pump upgrading unit and a medium-high temperature heat storage unit; the chemical heat pump upgrading unit finishes a medium-low temperature waste heat storage process, and then the medium-high temperature heat storage unit finishes a medium-high temperature grade heat energy storage process;
the photovoltaic temperature difference power generation subsystem comprises a solar energy utilization unit and a temperature difference power generation unit, wherein the solar energy utilization unit comprises a photovoltaic cell 3, a parabolic concentrator 2 and a solar vacuum heat collector 5, and the temperature difference power generation unit comprises a storage battery 1 and a temperature difference battery 5;
the chemical upgrading heat storage subsystem is characterized in that: the chemical upgrading heat storage subsystem comprises a chemical heat pump upgrading unit and a medium-high temperature heat storage unit; the chemical heat pump upgrading unit comprises an endothermic reaction device 6, a rectifying tower 7, a separation device 8, a heat regenerator 9 and a medium-high temperature grade heat energy storage device 10, wherein reaction raw materials based on a chemical heat storage principle are filled in the endothermic reaction device 6, and the reaction raw materials can generate a forward endothermic reaction (a reverse reaction which is an exothermic reaction) in a low-temperature environment; the medium-high temperature heat storage unit comprises a medium-high temperature grade heat energy storage device 10, a medium-high temperature heat storage device 11, a medium-high temperature resultant storage tank 12, a valve 13 and a gas compressor A.
2. The chemical upgrading thermal storage photovoltaic thermoelectric generation combined energy storage system according to claim 1, wherein the equipment connection characteristics are as follows:
a reaction raw material-reaction product outlet 6a of an endothermic reaction device 6 of the chemical heat pump upgrading unit is connected with a reaction raw material-reaction product inlet 7a of a rectifying tower 7 through a pipeline; a reaction raw material outlet 7d of the rectifying tower 7 is connected with a reaction raw material inlet 6c of the endothermic reaction device 6 through a pipeline, and a reaction raw material-reaction product outlet 7b of the rectifying tower 7 is connected with a reaction raw material-reaction product inlet 8a of the separation device 8 through a pipeline; a reaction product outlet 8b of the separation device 8 is connected with a reaction product inlet 9a of the heat regenerator 9 through a pipeline, and a reaction raw material outlet 8c of the separation device 8 is connected with a reaction raw material inlet 7c of the rectifying tower 7 through a pipeline; a reaction raw material outlet 9d of the heat regenerator 9 is connected with a reaction raw material inlet 6b of the endothermic reaction device 6 through a pipeline, and a reaction product outlet 9b of the heat regenerator 9 is connected with an internal reactor pipeline inlet 10a of the medium-high temperature grade heat energy storage device 10 through a pipeline; an outlet 10b of an internal reactor pipeline of the medium-high temperature grade heat energy storage device 10 is connected with a reaction raw material inlet 9c of the heat regenerator 9 through a pipeline;
a reaction product outlet 10d of the medium-high temperature grade heat energy storage device 10 of the medium-high temperature heat storage unit is connected with a heat source inlet 11c of the medium-high temperature heat storage device 11 through a pipeline; a heat source outlet 11d of the medium-high temperature heat storage device 11 is connected with an inlet of the compressor A through a pipeline; the outlet of the compressor A is connected with the inlet of the medium-high temperature product storage tank 12 through a pipeline; the outlet of the medium-high temperature resultant storage tank 12 is connected with the medium-high temperature reaction product inlet 11b of the medium-high temperature heat storage device 11 through a pipeline and a valve 13; a medium-high temperature reaction product outlet 11a of the medium-high temperature heat storage device 11 is connected with a reaction product inlet 10c of the medium-high temperature grade heat storage device 10 through a pipeline;
the photovoltaic temperature difference power generation subsystem is characterized in that: an outlet of an internal heat exchanger B of the medium-high temperature grade heat energy storage device 10 is connected with a hot end conduction surface inlet 4a of the thermoelectric cell through a pipeline; the outlet 4B of the hot end conducting surface of the thermoelectric cell is connected with the inlet of the internal heat exchanger B through a pipeline; the cold end of the thermoelectric cell is provided with a radiating fin, and a heat-conducting silicone grease layer is arranged between the thermoelectric cell and the radiating fin; the outlet 2b of the photovoltaic cell back pipeline is connected with the inlet 5a of the solar vacuum heat collector; the outlet 5b of the solar vacuum heat collector 5 is connected with the inlet of the internal heat exchanger C of the endothermic reaction device 6; the photovoltaic cell 2 and the thermoelectric cell 4 are respectively connected with the storage battery 1.
3. The photovoltaic thermoelectric cell combined energy storage system with the chemical upgrading and heat storage function as claimed in claim 1, wherein the system is implemented by the following steps:
firstly, in a time period when the sunlight is sufficiently illuminated, the light-gathering solar photovoltaic cell absorbs the solar energy for power generation, meanwhile, the temperature of the photovoltaic cell panel is increased under the influence of the solar irradiation, in order to ensure the photovoltaic power generation efficiency, cooling water is introduced into a heat exchange pipeline arranged on the back of the photovoltaic cell panel to utilize the light energy absorbed by the light-gathering solar photovoltaic cell for power generation, the cooling water cools the photovoltaic cell, the cooling water enters a solar vacuum heat collector 5 for absorbing heat again after the temperature of the cooling water is increased, then the cooling water enters an internal heat exchanger C of an endothermic reaction device 6 for heat exchange, and the heat-exchanged water can be used for heating;
in the chemical heat pump upgrading unit, reaction raw materials in an endothermic reaction device 6 absorb heat and raise temperature, a forward endothermic reaction is carried out at a proper temperature and pressure, and reaction products and part of unreacted reaction raw materials are conveyed to a rectifying tower 7; in the rectifying tower 7, the reaction product and the reaction raw material are separated according to the difference of the boiling points of the reaction product and the reaction raw material, most of the reaction raw material with higher boiling point is left in the rectifying tower 7 and then is discharged back to the endothermic reaction device 6, and the reaction product with certain temperature and lower boiling point and a small amount of the reaction raw material are discharged out of the rectifying tower 7 and enter a separation device 8; in the separation device 8, further separating the reaction raw materials and the reaction products to obtain high-purity reaction products, returning the separated reaction raw materials to the rectifying tower 7, and feeding the high-purity reaction products to the heat regenerator 9; in the heat regenerator 9, the high-purity reaction product absorbs heat and is heated, and then enters an internal reactor pipeline of the medium-high temperature grade heat energy storage device 10; in the internal reactor pipeline of the medium-high temperature grade heat energy storage device 10, a reverse exothermic reaction is performed on the high-purity reaction product at a proper temperature and pressure, the released heat is absorbed by the reaction raw material filled outside the internal reactor pipeline of the medium-high temperature grade heat energy storage device 10, and meanwhile, the reaction raw material with a certain temperature and the unreacted reaction product generated by the reverse exothermic reaction are conveyed to the heat regenerator 9; in the heat regenerator 9, the reaction raw material and the unreacted reaction product with a certain temperature exchange heat with the high-purity reaction product from the separation device 8, after the heat exchange is completed, the reaction raw material and the unreacted reaction product with a certain temperature are cooled and conveyed to the endothermic reaction device 6, and the high-purity reaction product from the separation device 8 absorbs heat and is heated up and then enters an internal reactor pipeline of the medium-high temperature grade heat energy storage device 10, so that the medium-low temperature grade heat energy upgrading process is completed;
in the medium-high temperature heat storage unit, reaction raw materials filled outside an internal reactor pipeline of the medium-high temperature grade heat energy storage device 10 absorb heat and then are heated, forward endothermic reaction is carried out at proper temperature and pressure, reaction products comprise solid, gaseous or liquid products, then the products are separated according to the difference of the phase state and density of the products, the solid products with high density are left in the medium-high temperature grade heat energy storage device 10, and the gaseous or liquid products with certain temperature and low density are discharged out of the medium-high temperature grade heat energy storage device 10 under the suction action of the compressor A; the gas or liquid product with certain temperature and low density exchanges heat through the medium-high temperature heat storage device 11, the heat of the gas or liquid product with certain temperature and low density is stored in the medium-high temperature heat storage device 11, after the heat exchange is finished, the temperature of the gas or liquid product with certain temperature and low density is reduced, and the gas or liquid product is sent into the medium-high temperature product storage tank 12 through the compressor A to be stored, so that the medium-high temperature grade heat energy storage process is finished;
in the medium-high temperature heat storage unit, gas or liquid products in a medium-high temperature product storage tank 12 are discharged, heat exchange is carried out through a medium-high temperature heat storage device 11, the gas or liquid products are preheated to a certain temperature and then enter a medium-high temperature grade heat energy storage device 10, the heat-conducting medium is preheated to a certain temperature, the heat-conducting medium with a certain temperature enters the hot end conducting surface inlet of the thermoelectric cell, the temperature of the heat-conducting medium with a certain temperature is reduced and enters the internal heat exchanger B of the medium-high temperature grade heat energy storage device 10, and the heat released by the reverse heat-releasing reaction is continuously absorbed, so that the medium-high temperature grade heat energy releasing process is completed.
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