CN114076416B - Thermoelectric integrated energy storage system for photo-thermal power generation and hydrogen production by combining molten salt - Google Patents
Thermoelectric integrated energy storage system for photo-thermal power generation and hydrogen production by combining molten salt Download PDFInfo
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- CN114076416B CN114076416B CN202111372378.0A CN202111372378A CN114076416B CN 114076416 B CN114076416 B CN 114076416B CN 202111372378 A CN202111372378 A CN 202111372378A CN 114076416 B CN114076416 B CN 114076416B
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 70
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 70
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 150000003839 salts Chemical class 0.000 title claims abstract description 47
- 238000004146 energy storage Methods 0.000 title claims abstract description 28
- 238000010248 power generation Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000010521 absorption reaction Methods 0.000 claims abstract description 21
- 230000008859 change Effects 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 13
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/006—Methods of steam generation characterised by form of heating method using solar heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/30—Solar heat collectors using working fluids with means for exchanging heat between two or more working fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/90—Solar heat collectors using working fluids using internal thermosiphonic circulation
- F24S10/95—Solar heat collectors using working fluids using internal thermosiphonic circulation having evaporator sections and condenser sections, e.g. heat pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
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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
- F24S60/10—Arrangements for storing heat collected by solar heat collectors using latent heat
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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
- Y02E10/44—Heat exchange systems
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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
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
-
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
Abstract
The invention discloses a thermoelectric comprehensive energy storage system for photo-thermal power generation and hydrogen production by combining molten salt, wherein a heat absorption outlet of an oil-steam evaporator is communicated with an inlet of a steam turbine, an outlet of the steam turbine is divided into two paths after passing through a condenser, one path is communicated with a heat absorption side inlet of the oil-steam evaporator, and the other path is communicated with a heat absorption side inlet of the oil-steam evaporator through a heat absorption side of a molten salt phase change kettle; the output end of the steam turbine is connected with the driving shaft of the first generator, the output end of the first generator is connected with the power interface of the water electrolysis device and the power grid through the first direct-alternating current converter, the oxygen outlet of the water electrolysis device is communicated with the oxygen tank, the hydrogen outlet of the water electrolysis device is communicated with the hydrogen tank, the outlet of the hydrogen tank is communicated with the hydrogen inlet of the hydrogen battery, and the output end of the hydrogen battery is connected with the power grid through the second direct-alternating current converter.
Description
Technical Field
The invention belongs to the field of clean energy power engineering and energy storage, and relates to a thermoelectric integrated energy storage system for producing hydrogen by combining photo-thermal power generation and molten salt.
Background
Under the premise of rapid global economic development and continuous improvement of human living standard, the problems of energy crisis and environmental pollution are increased. Under the large background, the clean, safe, efficient and economical sustainable energy is sought, the specific gravity of the sustainable energy in primary energy production and consumption is improved, and the smooth transformation of an electric power energy supply structure to green energy is promoted, so that the sustainable energy has become common public knowledge for human beings. By the end of 2018, the total amount of various spot original machines in China reaches 190 ten thousand MW, and is increased by 6.7% compared with 2017. The accumulated installed capacity of the main renewable energy power generation reaches 73 ten thousand MW and accounts for nearly 40% of the installed capacity of the national power supply. Wherein, the accumulated installed capacity of solar power generation is 18 MW, the newly increased installed capacity is 4.5 MW, and the increase is 34%. In terms of installation proportion, the power generation installation in China mainly uses traditional non-renewable fossil energy. Renewable clean energy will gradually realize alternatives to traditional energy, a fact that is not changeable. Therefore, the development of efficient, green and environment-friendly clean energy has become a core theme of the development of the current energy field.
Currently, the main clean energy sources mainly comprise wind energy, solar energy, biological energy, ocean energy, geothermal energy, hydrogen energy, water energy, nuclear energy and the like. Wherein, the water energy and the nuclear energy are generally applicable to large-scale power stations; wind energy, ocean energy and geothermal energy have obvious regional characteristics; the bioenergy has certain pollution to the environment during combustion; the solar energy and hydrogen energy system is mature and reliable in technology, is generally composed of common modularized equipment suitable for conventional distributed power stations, has almost no pollution to the environment in energy conversion, and has good application prospect in the development of the distributed power stations.
The solar photo-thermal system has compact system structure, no pollution, high energy absorption efficiency and low pollution in the production process of system components, and the related design and operation technology of the steam system is mature, so that more and more attention is paid to remote and solar spare areas. The solar photo-thermal system has the greatest characteristics that the input energy within 24 hours a day is obviously changed, and higher requirements are put forward on the variable working condition dynamic following characteristics and the variable working condition performance of the system in the running process of the system, so that the requirement of system output stability caused by large-range fluctuation of the input energy is met. Therefore, the system is required to have a good dynamic compensation function, the change condition of the input energy of the system can be monitored in real time, and the steam power system is subjected to advanced adjustment so as to weaken the additional influence caused by the inertia of the system; in addition, because the power generation system is generally required to have an energy storage function in order to be better suitable for the grid-connected peak shaving requirement of the power grid, the energy storage system is optimized in a coupling way by combining the characteristics of the energy storage system according to different user demands in the daytime and at night so as to meet the stable output of the system under different demands; and finally, combining different energy characteristics in the energy transmission link of the system, and respectively designing an energy storage scheme for the heat energy link and the electric energy link so as to meet the requirements of different users in a larger energy fluctuation range.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a thermoelectric integrated energy storage system for photo-thermal power generation and hydrogen production by combining molten salt, which can meet the requirement of a larger energy fluctuation range.
In order to achieve the aim, the thermoelectric integrated energy storage system for photo-thermal power generation and molten salt combined hydrogen production comprises a condensing lens, a solar photo-thermal tower, an oil-steam generator, a steam turbine, a first generator, a condenser, a condensate pump, an electrolyzed water device, an oxygen tank, a hydrogen battery, a direct-alternating current converter, a molten salt phase change kettle and a power grid;
The condensing lens is opposite to the solar photo-thermal tower, wherein the outlet of the solar photo-thermal tower is divided into two paths, one path is communicated with the heat release inlet of the molten salt phase-change kettle, the other path is communicated with the heat release side inlet of the oil-vapor evaporator, the heat release side outlet of the molten salt phase-change kettle is communicated with the heat release side inlet of the oil-vapor evaporator, and the heat release side outlet of the oil-vapor evaporator is communicated with the inlet of the solar photo-thermal tower;
The heat absorption outlet of the oil-steam evaporator is communicated with the inlet of the steam turbine, the outlet of the steam turbine is divided into two paths after passing through the condenser, one path is communicated with the heat absorption side inlet of the oil-steam evaporator, and the other path is communicated with the heat absorption side inlet of the oil-steam evaporator through the heat absorption side of the molten salt phase change kettle;
The output end of the steam turbine is connected with the driving shaft of the first generator, the output end of the first generator is connected with the power interface of the water electrolysis device and the power grid through the first direct-alternating current converter, the oxygen outlet of the water electrolysis device is communicated with the oxygen tank, the hydrogen outlet of the water electrolysis device is communicated with the hydrogen tank, the outlet of the hydrogen tank is communicated with the hydrogen inlet of the hydrogen battery, and the output end of the hydrogen battery is connected with the power grid through the second direct-alternating current converter.
The first generator is connected with the second generator through a speed reducer.
The outlet of the heat release side of the oil-steaming device is communicated with the inlet of the solar photo-thermal tower through a first valve.
The outlet of the solar photo-thermal tower is communicated with the heat release side inlet of the oil-steam evaporator through a second valve.
The outlet of the solar photo-thermal tower is communicated with the heat release side inlet of the molten salt phase change kettle through a third valve.
The outlet of the condenser is communicated with the heat absorbing side inlet of the oil-steam evaporator through a fourth valve.
And the heat absorption side outlet of the molten salt phase change kettle is communicated with the heat absorption side inlet of the oil-steam evaporator through a fifth valve.
The outlet of the hydrogen tank is communicated with the hydrogen inlet of the hydrogen cell through a sixth valve.
The invention has the following beneficial effects:
When the comprehensive thermoelectric energy storage system for photo-thermal power generation and hydrogen production by combining molten salt is specifically operated, a connection mode of coupling conduction oil heating with molten salt energy storage is adopted, so that the system is ensured to recover excess energy when the input energy is too high, the stored energy is released when the user demand is large, and meanwhile, the energy storage and release processes are carried out by combining the phase change of the molten salt, so that the phase change latent heat of a molten salt working medium is large, the system structure is compact, and the system has good structural characteristics; in addition, the motor is selectively output through the speed reducer under different working conditions, and the generated electric energy is subjected to AC-DC conversion and DC-AC conversion, so that electrolysis of water can be realized, oxygen and hydrogen can be produced, wherein the oxygen can be used as a chemical raw material for secondary use, the hydrogen can be further used for generating electricity through the hydrogen battery, and the DC and AC power requirements of a user are supplemented, so that the aim of trial-test variable working condition adjustment according to the user requirements is fulfilled; meanwhile, when the output power is too high and cannot be consumed by a user, the system can quickly convert the generated electric energy into molten salt liquefaction latent heat and hydrogen molecular energy through the first-stage heat storage and the second-stage electric storage; when the electric power requirement of a user increases, the energy of the liquid molten salt and the hydrogen molecular energy are converted into electric energy to be output, so that the power output adjusting capacity of the system is improved, and the inertia of the system is reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a diagram of an operating state of the present invention;
Fig. 3 is another working state diagram of the present invention.
Wherein, 1 is a condensing lens, 2 is a solar photo-thermal tower, 3 is an oil-steam evaporator, 4 is a steam turbine, 5 is a first generator, 6 is a second generator, 7 is a condenser, 8 is a condensate pump 9 is an electrolytic water device, 10 is an oxygen tank, 11 is a hydrogen tank, 12 is a hydrogen battery, 13 is a direct-alternating current converter, 14 is a molten salt phase change kettle, and 15 is a power grid.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Referring to fig. 1, the thermoelectric integrated energy storage system for photo-thermal power generation and hydrogen production by combining molten salt comprises a condensing lens 1, a solar photo-thermal tower 2, an oil-steam evaporator 3, a steam turbine 4, a first generator 5, a second generator 6, a condenser 7, a condensate pump 8, an electrolyzed water device 9, an oxygen tank 10, a hydrogen tank 11, a hydrogen battery 12, a direct-alternating current converter 13, a molten salt phase change kettle 14 and a power grid 15;
The condensing lens 1 is opposite to the solar photo-thermal tower 2, wherein the outlet of the solar photo-thermal tower 2 is divided into two paths, one path is communicated with the heat release inlet of the molten salt phase-change kettle 14, the other path is communicated with the heat release side inlet of the oil-vapor evaporator 3, the heat release side outlet of the molten salt phase-change kettle 14 is communicated with the heat release side inlet of the oil-vapor evaporator 3, and the heat release side outlet of the oil-vapor evaporator 3 is communicated with the inlet of the solar photo-thermal tower 2;
the heat absorption outlet of the oil-steam evaporator 3 is communicated with the inlet of the steam turbine 4, the outlet of the steam turbine 4 is divided into two paths after passing through the condenser 7, one path is communicated with the heat absorption side inlet of the oil-steam evaporator 3, and the other path is communicated with the heat absorption side inlet of the oil-steam evaporator 3 through the heat absorption side of the molten salt phase change kettle 14;
The output end of the steam turbine 4 is connected with the driving shafts of the first generator 5 and the second generator 6, the output end of the first generator 5 and the output end of the second generator 6 are connected with the power interface of the water electrolysis device 9 and the power grid 15 through the first direct-alternating current converter 13, the oxygen outlet of the water electrolysis device 9 is communicated with the oxygen tank 10, the hydrogen outlet of the water electrolysis device 9 is communicated with the hydrogen tank 11, the outlet of the hydrogen tank 11 is communicated with the hydrogen inlet of the hydrogen battery 12, and the output end of the hydrogen battery 12 is connected with the power grid 15 through the second direct-alternating current converter 13.
The outlet of the heat release side of the oil-steam evaporator 3 is communicated with the inlet of the solar photo-thermal tower 2 through a first valve a; the outlet of the solar photo-thermal tower 2 is communicated with the heat release side inlet of the oil-steam evaporator 3 through a second valve b; the outlet of the solar photo-thermal tower 2 is communicated with the heat release side inlet of the molten salt phase change kettle 14 through a third valve c; the outlet of the heat absorbing side of the molten salt phase change kettle 14 is communicated with the inlet of the heat absorbing side of the oil-vapor evaporator 3 through a fifth valve e, the outlet of the condenser 7 is communicated with the inlet of the heat absorbing side of the oil-vapor evaporator 3 through a fourth valve d, and the outlet of the hydrogen tank 11 is communicated with the hydrogen inlet of the hydrogen cell 12 through a sixth valve f.
Example 1
Referring to fig. 1, in this embodiment, a condensing lens 1 condenses large area sunlight onto a solar photo-thermal tower 2, and heats conduction oil to 400-500 ℃ to ensure that the primary steam parameters are not lower than 350 ℃ and the pressure is not lower than 7MPa. Saturated steam flow 1050t/h under rated working condition, rated output power is 5MW. Because the input energy of the solar photo-thermal system continuously changes along with time during the daytime and the input energy of the solar photo-thermal system is reduced to 0 at night, the power generation system and the energy storage system are always in a dynamic regulation state. In the running process of the system, the input energy is continuously changed, but the electric energy output in most of the day can be ensured to be relatively stable due to the auxiliary running of the energy storage system. This allows the system to achieve a relatively stable power output by utilizing a relatively unstable energy source, with good economic and social benefits.
When the system starts to work, the collecting lens 1 collects sunlight to a point for heating the conduction oil storage tank above the solar photo-thermal tower 2. When the internal temperature of the heat conducting oil is increased, the heat conducting oil heats the water vapor through the oil-vapor evaporator 3, and the heated saturated vapor directly enters the vapor turbine 4 to do work. At this time, the fifth valve e is closed, and the saturated water discharged from the condenser 7 flows through the fourth valve d into the oil-steamer 3 to enter the next cycle. The second generator 6 delivers the generated electrical energy into the electrical grid 15. At the moment, the second valve b and the third valve c disconnect the molten salt energy storage system from the system, the speed reducer disconnects the second generator 6 from the first generator 5, the hydrogen production system does not work, and the system is in a stable power generation and no energy storage state at the moment.
Example two
Referring to fig. 2, when the temperature of the conduction oil in the solar photo-thermal tower 2 exceeds the highest heating temperature required by the steam power system, in order to ensure that the steam power system does not operate in overload, the conduction oil is heated up quickly, and the molten salt energy storage system needs to be started quickly, so that the energy absorbed by the conduction oil is transferred to the molten salt phase change kettle 14 quickly and stored. Therefore, at this time, the opening of the second valve b needs to be reduced, the opening of the third valve c needs to be increased, so that the flow of the heat conduction oil flowing through the oil-steam evaporator 3 is reduced, the flow of the heat conduction oil flowing through the molten salt phase-change kettle 14 is increased, more heat energy is stored in the molten salt phase-change kettle 14, the highest heat storage capacity can reach 20MWh, and the system can work for more than 15h under the condition of no light source. If the demand of the user is reduced, part of the shaft work received by the second generator 6 can be transferred to the first generator 5 through the speed reducer, and the electrolyzed water is electrolyzed through the direct-alternating current converter 13 to obtain oxygen and hydrogen respectively, and the oxygen and the hydrogen are stored in the hydrogen tank 11 and the oxygen tank 10.
Example III
Referring to fig. 3, when the condensing lens 1 receives no energy at night or in overcast and rainy days, the solar photo-thermal tower 2 has no energy input, and the previously stored energy needs to be released again to the system for the system to generate electricity or supply heat. For the heat storage system, the second valve b is closed, the third valve c is opened, and the heat conduction oil continuously absorbs heat from the molten salt phase change kettle 14 in a circulating way, and the heat is transferred to the water vapor through the oil-vapor evaporator 3 again, so that the vapor turbine 4 is further pushed to do work. And at this time, the sixth valve f is opened, and the hydrogen in the hydrogen tank 11 is also supplied to the hydrogen cell 12 to generate electricity. The generated electric energy can be directly used by direct current users, or can be converted into alternating current through a direct-alternating current converter 13 and then transmitted in a grid connection mode.
Claims (8)
1. The thermoelectric integrated energy storage system for producing hydrogen by combining photo-thermal power generation and molten salt is characterized by comprising a condenser (1), a solar photo-thermal tower (2), an oil-steam evaporator (3), a steam turbine (4), a first generator (5), a condenser (7), a condensate pump (8), an electrolytic water device (9), an oxygen tank (10), a hydrogen tank (11), a hydrogen battery (12), a direct-alternating current converter (13), a molten salt phase-change kettle (14) and a power grid (15);
The condensing lens (1) is opposite to the solar photo-thermal tower (2), wherein the outlet of the solar photo-thermal tower (2) is divided into two paths, one path is communicated with the heat release side inlet of the molten salt phase-change kettle (14), the other path is communicated with the heat release side inlet of the oil-vapor evaporator (3), the heat release side outlet of the molten salt phase-change kettle (14) is communicated with the heat release side inlet of the oil-vapor evaporator (3), and the heat release side outlet of the oil-vapor evaporator (3) is communicated with the inlet of the solar photo-thermal tower (2);
the heat absorption outlet of the oil-steam evaporator (3) is communicated with the inlet of the steam turbine (4), the outlet of the steam turbine (4) is divided into two paths after passing through the condenser (7), one path is communicated with the heat absorption side inlet of the oil-steam evaporator (3), and the other path is communicated with the heat absorption side inlet of the oil-steam evaporator (3) through the heat absorption side of the molten salt phase change kettle (14);
The output end of the steam turbine (4) is connected with a driving shaft of the first generator (5), the output end of the first generator (5) is connected with a power interface of the water electrolysis device (9) and a power grid (15) through a first direct-alternating current converter (13), an oxygen outlet of the water electrolysis device (9) is communicated with an oxygen tank (10), a hydrogen outlet of the water electrolysis device (9) is communicated with a hydrogen tank (11), an outlet of the hydrogen tank (11) is communicated with a hydrogen inlet of a hydrogen battery (12), and an output end of the hydrogen battery (12) is connected with the power grid (15) through a second direct-alternating current converter (13).
2. The integrated thermoelectric energy storage system for producing hydrogen by combining photo-thermal power generation and molten salt as claimed in claim 1, wherein the first generator (5) and the second generator (6) are connected through a decelerator.
3. The integrated thermoelectric energy storage system for producing hydrogen by combining photo-thermal power generation and molten salt as claimed in claim 1, wherein the outlet of the heat release side of the oil-vapor evaporator (3) is communicated with the inlet of the solar photo-thermal tower (2) through a first valve (a).
4. A combined heat and power energy storage system for producing hydrogen by combining photo-thermal power generation and molten salt as claimed in claim 3 wherein the outlet of the solar photo-thermal tower (2) is connected to the heat release side inlet of the oil-vapor evaporator (3) via a second valve (b).
5. The integrated thermoelectric energy storage system for producing hydrogen by combining photo-thermal power generation and molten salt as claimed in claim 4, wherein the outlet of the solar photo-thermal tower (2) is communicated with the heat release side inlet of the molten salt phase change kettle (14) through a third valve (c).
6. The integrated thermoelectric energy storage system for photo-thermal power generation and molten salt combined hydrogen production as claimed in claim 5 wherein the outlet of the condenser (7) is connected to the heat absorbing side inlet of the oil-vapor evaporator (3) via a fourth valve (d).
7. The integrated thermoelectric energy storage system for photo-thermal power generation and molten salt combined hydrogen production as claimed in claim 6, wherein the heat absorption side outlet of the molten salt phase change kettle (14) is communicated with the heat absorption side inlet of the oil-vapor evaporator (3) through a fifth valve (e).
8. The integrated thermoelectric energy storage system for photo-thermal power generation and molten salt combined hydrogen production as claimed in claim 7 wherein the outlet of the hydrogen tank (11) is in communication with the hydrogen inlet of the hydrogen cell (12) via a sixth valve (f).
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