CN111336571A - Water electrolysis hydrogen production waste heat utilization system and working method thereof - Google Patents
Water electrolysis hydrogen production waste heat utilization system and working method thereof Download PDFInfo
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- CN111336571A CN111336571A CN202010266677.5A CN202010266677A CN111336571A CN 111336571 A CN111336571 A CN 111336571A CN 202010266677 A CN202010266677 A CN 202010266677A CN 111336571 A CN111336571 A CN 111336571A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 271
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 71
- 239000001257 hydrogen Substances 0.000 title claims abstract description 67
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 67
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 40
- 239000002918 waste heat Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 239000012528 membrane Substances 0.000 claims abstract description 40
- 238000004821 distillation Methods 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000003792 electrolyte Substances 0.000 claims description 60
- 239000007789 gas Substances 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 23
- 239000003595 mist Substances 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 230000001502 supplementing effect Effects 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000013589 supplement Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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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
- C25B15/00—Operating or servicing cells
-
- 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
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
-
- 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
-
- 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
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention discloses a water electrolysis hydrogen production waste heat utilization system and a working method thereof, and belongs to the technical field of water electrolysis hydrogen production. Comprises a water electrolysis hydrogen production system, a membrane distillation system, a heat user heating system and a circulating cooling system; the waste heat generated in the hydrogen production process by water electrolysis is used as a heat source in the membrane distillation process and used for preparing water supplement of the hydrogen production system by water electrolysis, so that the heating energy consumption in the membrane distillation process is saved. Compared with the traditional water making system, the membrane distillation system has lower water making energy consumption. The waste heat gradient utilization mode is used for heating circulating water after membrane distillation raw water still has waste heat, can be used for heating heat users such as electrolysis hydrogen production workshops or containers in winter, guarantees the temperature requirement of the space where the hydrogen production system is located, and improves the energy utilization efficiency of the whole electrolysis hydrogen production system through gradient utilization of the waste heat. The system has reasonable design, performs cascade comprehensive utilization on the waste heat generated by hydrogen production through water electrolysis, improves the energy conversion efficiency and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of hydrogen production by water electrolysis, and particularly relates to a water electrolysis hydrogen production waste heat utilization system and a working method thereof.
Background
The hydrogen energy is a green and efficient secondary energy and has wide application prospect in the fields of traffic, electric power, fuel and the like. With the large-scale development of renewable energy sources such as wind power, photovoltaic and the like, the hydrogen production by electrolyzing water by utilizing the renewable energy sources provides a green, low-carbon, low-cost and sustainable production mode for hydrogen energy. However, compared with the conventional hydrogen production from fossil raw materials such as coal gasification hydrogen production and natural gas reforming hydrogen production, hydrogen production by electrolysis of water has relatively high cost mainly due to large power consumption. In the process of producing hydrogen by electrolyzing water, electric energy generates hydrogen and oxygen under the catalysis of an electrode, the temperature of the electrolyte is gradually increased due to the resistance of the electrode, the electrolyte and a diaphragm, and the electrolyte is generally required to be circularly cooled in order to control the electrolysis temperature within a certain range (60-100 ℃), so that part of heat energy loss is caused, and the integral conversion efficiency of the electric energy is reduced. In order to improve the electric energy conversion efficiency of hydrogen production by water electrolysis, the hot point of the current technology development is to improve the catalytic activity of the electrode so as to achieve the purpose of improving the electricity-hydrogen conversion efficiency, but the current technology development is limited by the factors of catalyst cost, service life, industrial amplification and the like, and some high-performance catalysts are difficult to realize industrial application.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the water electrolysis hydrogen production waste heat utilization system and the working method thereof, the system is reasonable in design, the waste heat of water electrolysis hydrogen production is comprehensively utilized in a gradient manner, and the energy conversion efficiency is improved.
The invention is realized by the following technical scheme:
the invention discloses a waste heat utilization system for hydrogen production by water electrolysis, which comprises a water electrolysis hydrogen production system, a membrane distillation system, a heat user heating system and a circulating cooling system; the water electrolysis hydrogen production system comprises an electrolytic bath, an electrolyte heat exchanger, a gas-liquid separator, a gas cooler, a water mist droplet catcher and a water replenishing system; the membrane distillation system comprises a membrane distillation assembly, a raw water auxiliary heating system, a raw water heat exchange system and a produced water heat exchange system;
the electrolytic bath, the gas-liquid separator and the electrolyte heat exchanger are connected through an electrolyte circulating pipeline to form an electrolyte circulating loop; a pure water inlet of the gas-liquid separator is connected with a pure water outlet of the water replenishing system, a gas outlet of the gas-liquid separator is connected with a gas inlet of the gas cooler, a gas outlet of the gas cooler is connected with a water mist drop catcher, and the water mist drop catcher is connected with a hydrogen and oxygen discharging pipeline; a circulating water outlet of the gas cooler is connected with a circulating water inlet of the electrolyte heat exchanger, and a circulating water outlet of the electrolyte heat exchanger is connected with a circulating water inlet of the raw water heat exchange system;
a circulating water outlet of the raw water heat exchange system is connected with a heat user heating system, and the raw water heat exchange system, the raw water auxiliary heating system and the membrane distillation assembly are connected through a raw water circulating pipeline to form a raw water circulating loop; a water production circulation loop is formed between the membrane distillation assembly and the water production heat exchange system through a water production circulation pipeline; a produced water outlet of the produced water heat exchange system is connected with a pure water inlet of the water replenishing system, and the produced water heat exchange system is connected with the circulating cooling system through a circulating water pipeline to form a circulating water circulating loop; the circulating cooling system is connected with a circulating water inlet of the gas cooler, the heat user heating system is connected with the circulating cooling system, and a circulating water circulating loop is formed among the user heating system, the circulating cooling system, the gas cooler, the electrolyte heat exchanger and the raw water heat exchange system.
Preferably, the electrolytic cell is an alkaline electrolytic cell or a solid polymer electrolytic cell.
Preferably, the electrolyte heat exchanger, the gas cooler, the raw water heat exchange system and the produced water heat exchange system are dividing wall type heat exchangers.
Preferably, the raw water auxiliary heating system is a resistance heater or a dividing wall type heat exchanger.
Preferably, the thermal user heating system is a heating air heat exchanger.
Preferably, the electrolyte circulation pipeline, the raw water circulation pipeline and the produced water circulation pipeline are all provided with thermometers and regulating valves.
The invention discloses a working method of the water electrolysis hydrogen production waste heat utilization system, which comprises the following steps:
separating liquid from the product of the electrolytic reaction in the electrolytic bath by a gas-liquid separator, then cooling the liquid in a gas cooler, further removing water mist by a water mist droplet catcher to obtain hydrogen and oxygen, and discharging the hydrogen and oxygen through a hydrogen and oxygen discharge pipeline; the water in the electrolyte is gradually consumed, and the temperature of the electrolyte is gradually increased;
circulating water in the circulating cooling system is divided into two paths, wherein one path of circulating water enters the gas cooler to cool an electrolysis reaction product after liquid separation and then enters the electrolyte heat exchanger to exchange heat with the electrolyte, and the electrolyte returns to the electrolytic bath again to participate in electrolysis reaction after the temperature of the electrolyte is reduced; the circulating water enters a raw water heat exchange system after the temperature of the circulating water is raised, exchanges heat with raw water, enters a heat user heating system for supplying heat, enters a circulating cooling system, raises the temperature of the raw water after heat exchange, further raises the temperature through a raw water auxiliary heating system, and then enters a membrane distillation assembly; driving water on a raw water side to enter a water production side through a membrane in a steam form by virtue of steam pressure difference in the membrane distillation assembly, cooling and condensing the water into liquid to obtain high-quality produced water, and cooling the produced water by a water production heat exchange system and then entering a water supplementing system to supplement water consumed by electrolytic reaction;
and the other path of circulating water in the circulating cooling system enters a produced water heat exchange system to cool the produced water and then returns to the circulating cooling system again.
Preferably, the operating temperature of the electrolyte in the electrolytic cell is 80-100 ℃, the temperature of the electrolyte cooled by the electrolyte heat exchanger is 60-70 ℃, the temperature of the raw water heated by the raw water heat exchange system is 40-80 ℃, and the temperature of the produced water cooled by the produced water heat exchange system is 5-20 ℃.
Compared with the prior art, the invention has the following beneficial technical effects:
the waste heat utilization system for hydrogen production by electrolyzed water, disclosed by the invention, is combined with the hydrogen production system by electrolyzed water, the membrane distillation system, the heat user heating system and the circulating cooling system, and the waste heat generated in the hydrogen production process by electrolyzed water is used as a heat source in the membrane distillation process and is used for preparing water supplement of the hydrogen production system by electrolyzed water, so that the heating energy consumption in the membrane distillation process is saved. Compared with the traditional water production systems adopting ultrafiltration, reverse osmosis and the like, the membrane distillation system has lower water production energy consumption. The waste heat gradient utilization mode is adopted, the circulating water after the heating membrane distills the raw water still has waste heat, the circulating water can be used for heating heat users such as an electrolytic hydrogen production workshop or a container in winter, the temperature requirement of the space where the hydrogen production system is located is guaranteed, and the energy utilization efficiency of the whole electrolytic hydrogen production system is improved through gradient utilization of the waste heat. The system has reasonable design, performs cascade comprehensive utilization on the waste heat generated by hydrogen production through water electrolysis, improves the energy conversion efficiency and has good application prospect.
Furthermore, the electrolytic tank adopts an alkaline electrolytic tank or a solid polymer electrolytic tank, both adopt liquid electrolyte, the operating temperature of the electrolyte is close, and the applicability to the system is good.
Furthermore, the electrolyte heat exchanger, the gas cooler, the raw water heat exchange system and the produced water heat exchange system adopt dividing wall type heat exchangers, and heat recovery and cascade utilization can be realized through a circulating heat exchange process.
Furthermore, the raw water auxiliary heating system adopts a resistance heater or a dividing wall type heat exchanger, so that the temperature of the raw water can be adjusted, and the water yield can be controlled.
Furthermore, the electrolyte circulation pipeline, the raw water circulation pipeline and the produced water circulation pipeline are respectively provided with a thermometer and an adjusting valve, so that the temperature of each system can be monitored in real time and adjusted, and the normal operation of the system is guaranteed.
The working method of the electrolytic water hydrogen production waste heat utilization system disclosed by the invention has the advantages of low energy consumption, obvious energy-saving effect, capability of improving the comprehensive utilization rate of energy by utilizing the preheating mode in a gradient manner, good economic benefit, obvious environmental protection advantage and good application prospect.
Furthermore, the temperature in each device is set, so that the electrolytic reaction waste heat is efficiently and comprehensively utilized in a gradient manner, and the requirements of each level on heat are met.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the water electrolysis hydrogen production waste heat utilization system.
In the figure: 1-water electrolysis hydrogen production system, 11-electrolytic tank, 12-electrolyte heat exchanger, 13-gas-liquid separator, 14-gas cooler, 15-water mist drop catcher, 16-water supplement system, 2-membrane distillation system, 21-membrane distillation component, 22-raw water auxiliary heating system, 23-raw water heat exchange system, 24-water production heat exchange system, 3-heat user heating system and 4-circulation cooling system.
Detailed Description
The invention will now be described in further detail with reference to the following drawings and specific examples, which are intended to be illustrative and not limiting:
referring to fig. 1, the system for utilizing the waste heat of hydrogen production by electrolyzing water comprises a hydrogen production system 1 by electrolyzing water, a membrane distillation system 2, a heat user heating system 3 and a circulating cooling system 4; the water electrolysis hydrogen production system 1 comprises an electrolytic bath 11, an electrolyte heat exchanger 12, a gas-liquid separator 13, a gas cooler 14, a water mist droplet catcher 15 and a water replenishing system 16; the membrane distillation system 2 comprises a membrane distillation assembly 21, a raw water auxiliary heating system 22, a raw water heat exchange system 23 and a produced water heat exchange system 24;
the electrolytic bath 11, the gas-liquid separator 13 and the electrolyte heat exchanger 12 are connected through an electrolyte circulation pipeline to form an electrolyte circulation loop; a pure water inlet of the gas-liquid separator 13 is connected with a pure water outlet of the water supplementing system 16, a gas outlet of the gas-liquid separator 13 is connected with a gas inlet of the gas cooler 14, a gas outlet of the gas cooler 14 is connected with a water mist drop catcher 15, and the water mist drop catcher 15 is connected with a hydrogen and oxygen discharge pipeline; a circulating water outlet of the gas cooler 14 is connected with a circulating water inlet of the electrolyte heat exchanger 12, and a circulating water outlet of the electrolyte heat exchanger 12 is connected with a circulating water inlet of the raw water heat exchange system 23;
a circulating water outlet of the raw water heat exchange system 23 is connected with the heat user heating system 3, and the raw water heat exchange system 23, the raw water auxiliary heating system 22 and the membrane distillation assembly 21 are connected through a raw water circulating pipeline to form a raw water circulating loop; a water production circulation loop is formed between the membrane distillation component 21 and the water production heat exchange system 24 through a water production circulation pipeline; a produced water outlet of the produced water heat exchange system 24 is connected with a pure water inlet of the water supplementing system 16, and the produced water heat exchange system 24 is connected with the circulating cooling system 4 through a circulating water pipeline to form a circulating water circulating loop; the circulating cooling system 4 is connected with a circulating water inlet of the gas cooler 14, the heat user heating system 3 is connected with the circulating cooling system 4, and a circulating water circulating loop is formed among the user heating system 3, the circulating cooling system 4, the gas cooler 14, the electrolyte heat exchanger 12 and the raw water heat exchange system 23.
The electrolytic bath 11 is preferably an alkaline electrolytic bath or a solid polymer electrolytic bath.
The electrolyte heat exchanger 12, the gas cooler 14, the raw water heat exchange system 23 and the produced water heat exchange system 24 are preferably divided wall type heat exchangers.
The raw water auxiliary heating system 22 preferably adopts a resistance heater or a dividing wall type heat exchanger.
The thermal user heating system preferably employs a heating heat exchanger.
The thermometers and the regulating valves are arranged on the electrolyte circulating pipeline, the raw water circulating pipeline and the produced water circulating pipeline, so that the running health condition of each system can be monitored in real time, and automatic control can be realized by matching with an automatic control system. The following settings are typically made: the operating temperature of the electrolyte in the electrolytic cell 11 is 80-100 ℃, the temperature of the electrolyte cooled by the electrolyte heat exchanger 12 is 60-70 ℃, the temperature of the raw water heated by the raw water heat exchange system 23 is 40-80 ℃, and the temperature of the produced water cooled by the produced water heat exchange system 24 is 5-20 ℃.
The working method of the water-splitting hydrogen production waste heat utilization system is further explained as follows:
the electrolytic reaction is carried out in the electrolytic tank 11 of the water electrolysis hydrogen production system 1 to generate hydrogen and oxygen, the water in the electrolyte is gradually consumed, and the temperature of the electrolyte in the electrolytic tank 11 is increased to 90 ℃; circulating water of the circulating cooling system 4 is divided into two paths, the first path of circulating water firstly enters a gas cooler 14 and an electrolyte heat exchanger 12 of the water electrolysis hydrogen production system 1, the temperature of the electrolyte is reduced to 60 ℃ through the heat exchange effect, and the electrolyte returns to the electrolytic bath 11 again; the temperature of the circulating water rises due to the heat exchange effect, then the circulating water enters a raw water heat exchange system 23 of the membrane distillation system 2, the temperature of the raw water rises through the heat exchange effect, and then the temperature of the raw water rises to 60 ℃ through a raw water auxiliary heating system 22; and the circulating water enters a workshop heating system after coming out of the raw water heat exchange system 23, and provides heat for a workshop through the heat exchange effect. The second path of circulating water of the circulating cooling system 4 enters a water production heat exchange system 24 of the membrane distillation system 2, and the temperature of the produced water is reduced to 10 ℃ through the heat exchange effect; the temperature of the raw water side of the membrane distillation system 2 is 60 ℃, the temperature of the water producing side is 10 ℃, water on the raw water side is driven to permeate the membrane to enter the water producing side in a steam form due to the steam pressure difference on two sides of the membrane distillation assembly 21, the water is condensed into liquid on the water producing side due to the temperature reduction, impurities such as salt in the raw water cannot pass through the membrane, the raw water is gradually reduced, and the produced water is gradually increased; the membrane distillation system 2 obtains high-quality produced water, and the produced water enters a water supplementing system 16 of the water electrolysis hydrogen production system 1 and is used for supplementing water consumed in the electrolysis process.
It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.
Claims (8)
1. The water electrolysis hydrogen production waste heat utilization system is characterized by comprising a water electrolysis hydrogen production system (1), a membrane distillation system (2), a heat user heating system (3) and a circulating cooling system (4); the water electrolysis hydrogen production system (1) comprises an electrolytic bath (11), an electrolyte heat exchanger (12), a gas-liquid separator (13), a gas cooler (14), a water mist droplet catcher (15) and a water replenishing system (16); the membrane distillation system (2) comprises a membrane distillation assembly (21), a raw water auxiliary heating system (22), a raw water heat exchange system (23) and a produced water heat exchange system (24);
the electrolytic bath (11), the gas-liquid separator (13) and the electrolyte heat exchanger (12) are connected through an electrolyte circulation pipeline to form an electrolyte circulation loop; a pure water inlet of the gas-liquid separator (13) is connected with a pure water outlet of the water supplementing system (16), a gas outlet of the gas-liquid separator (13) is connected with a gas inlet of the gas cooler (14), a gas outlet of the gas cooler (14) is connected with a water mist droplet catcher (15), and the water mist droplet catcher (15) is connected with a hydrogen and oxygen discharge pipeline; a circulating water outlet of the gas cooler (14) is connected with a circulating water inlet of the electrolyte heat exchanger (12), and a circulating water outlet of the electrolyte heat exchanger (12) is connected with a circulating water inlet of the raw water heat exchange system (23);
a circulating water outlet of the raw water heat exchange system (23) is connected with the heat user heating system (3), and the raw water heat exchange system (23), the raw water auxiliary heating system (22) and the membrane distillation assembly (21) are connected through a raw water circulating pipeline to form a raw water circulating loop; a water production circulation loop is formed between the membrane distillation assembly (21) and the water production heat exchange system (24) through a water production circulation pipeline; a produced water outlet of the produced water heat exchange system (24) is connected with a pure water inlet of the water supplementing system (16), and the produced water heat exchange system (24) is connected with the circulating cooling system (4) through a circulating water pipeline to form a circulating water circulating loop; the circulating cooling system (4) is connected with a circulating water inlet of the gas cooler (14), the heat user heating system (3) is connected with the circulating cooling system (4), and a circulating water circulating loop is formed among the user heating system (3), the circulating cooling system (4), the gas cooler (14), the electrolyte heat exchanger (12) and the raw water heat exchange system (23).
2. The system for utilizing the residual heat from hydrogen production by electrolyzing water as claimed in claim 1, wherein the electrolytic cell (11) is an alkaline electrolytic cell or a solid polymer electrolytic cell.
3. The system for utilizing the waste heat generated by hydrogen production through water electrolysis according to claim 1, wherein the electrolyte heat exchanger (12), the gas cooler (14), the raw water heat exchange system (23) and the produced water heat exchange system (24) are dividing wall type heat exchangers.
4. The system for utilizing the waste heat in hydrogen production by electrolyzing water as claimed in claim 1, wherein the raw water auxiliary heating system (22) is a resistance heater or a dividing wall type heat exchanger.
5. The system for utilizing the waste heat generated by hydrogen production through water electrolysis as claimed in claim 1, wherein the heat consumer heating system (3) is a heating heat exchanger.
6. The system for utilizing waste heat generated by hydrogen production through water electrolysis according to claim 1, wherein a thermometer and an adjusting valve are arranged on the electrolyte circulation pipeline, the raw water circulation pipeline and the produced water circulation pipeline.
7. The working method of the system for utilizing the waste heat generated by hydrogen production through water electrolysis according to any one of claims 1 to 6 is characterized by comprising the following steps:
the product of the electrolytic reaction in the electrolytic bath (11) is separated from liquid by a gas-liquid separator (13), enters a gas cooler (14) for cooling, is further removed of water mist by a water mist drop catcher (15), and the obtained hydrogen and oxygen are discharged by a hydrogen and oxygen discharge pipeline; the water in the electrolyte is gradually consumed, and the temperature of the electrolyte is gradually increased;
circulating water in the circulating cooling system (4) is divided into two paths, one path of circulating water enters the gas cooler (14) to cool the electrolysis reaction product after liquid separation, then enters the electrolyte heat exchanger (12) to exchange heat with the electrolyte, and the electrolyte returns to the electrolytic bath (11) again to participate in the electrolysis reaction after the temperature of the electrolyte is reduced; the temperature of the circulating water rises and then enters a raw water heat exchange system (23) to exchange heat with raw water, the circulating water enters a heat user heating system (3) to supply heat and then enters a circulating cooling system (4), the temperature of the raw water after heat exchange rises, and the raw water is further heated by a raw water auxiliary heating system (22) and then enters a membrane distillation assembly (21); the steam pressure difference in the membrane distillation assembly (21) drives water on the raw water side to penetrate through the membrane in a steam form to enter the water production side, the water is condensed into liquid after being cooled to obtain high-quality produced water, and the produced water is cooled by the water production heat exchange system (24) and then enters the water replenishing system (16) to replenish water consumed by the electrolytic reaction;
and the other path of circulating water in the circulating cooling system (4) enters a water-producing heat exchange system (24) to cool the produced water and then returns to the circulating cooling system (4).
8. The working method of the electrolytic water hydrogen production waste heat utilization system according to claim 7, characterized in that the operating temperature of the electrolyte in the electrolytic cell (11) is 80-100 ℃, the temperature of the electrolyte cooled by the electrolyte heat exchanger (12) is 60-70 ℃, the temperature of the raw water heated by the raw water heat exchange system (23) is 40-80 ℃, and the temperature of the produced water cooled by the produced water heat exchange system (24) is 5-20 ℃.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN112921343A (en) * | 2021-02-20 | 2021-06-08 | 河北建投新能源有限公司 | Cold and hot hydrogen combined supply system and control method |
| CN113249736A (en) * | 2021-04-22 | 2021-08-13 | 浙江大学 | Water electrolysis hydrogen and heat cogeneration system and method integrating renewable energy |
| WO2021203665A1 (en) * | 2020-04-07 | 2021-10-14 | 中国华能集团清洁能源技术研究院有限公司 | System for utilizing waste heat during hydrogen production by water electrolysis, and working method therefor |
| CN114574874A (en) * | 2022-02-28 | 2022-06-03 | 阳光氢能科技有限公司 | Water electrolysis hydrogen production system and heat management system thereof |
| CN114574875A (en) * | 2022-03-02 | 2022-06-03 | 上海核工程研究设计院有限公司 | Comprehensive utilization system for electrolytic hydrogen production of nuclear power plant |
| CN114574877A (en) * | 2022-04-06 | 2022-06-03 | 中国船舶重工集团公司第七一八研究所 | Water electrolysis hydrogen production system with waste heat utilization |
| CN114807960A (en) * | 2022-04-13 | 2022-07-29 | 四川华能氢能科技有限公司 | Waste heat recovery management and control platform of large alkaline electrolyzed water hydrogen production device |
| CN114807962A (en) * | 2022-04-14 | 2022-07-29 | 华中科技大学 | Alkaline electrolyzed water hydrogen production system based on absorption heat pump and adjusting method thereof |
| CN114808029A (en) * | 2022-04-14 | 2022-07-29 | 华中科技大学 | Thermal management regulation system for hydrogen production by alkaline electrolyzed water and regulation method thereof |
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| CN112921343A (en) * | 2021-02-20 | 2021-06-08 | 河北建投新能源有限公司 | Cold and hot hydrogen combined supply system and control method |
| CN113249736A (en) * | 2021-04-22 | 2021-08-13 | 浙江大学 | Water electrolysis hydrogen and heat cogeneration system and method integrating renewable energy |
| CN114574874A (en) * | 2022-02-28 | 2022-06-03 | 阳光氢能科技有限公司 | Water electrolysis hydrogen production system and heat management system thereof |
| CN114574875A (en) * | 2022-03-02 | 2022-06-03 | 上海核工程研究设计院有限公司 | Comprehensive utilization system for electrolytic hydrogen production of nuclear power plant |
| CN114574875B (en) * | 2022-03-02 | 2023-09-05 | 上海核工程研究设计院股份有限公司 | Comprehensive utilization system for electrolytic hydrogen production of nuclear power plant |
| CN114574877B (en) * | 2022-04-06 | 2023-05-05 | 中国船舶重工集团公司第七一八研究所 | Water electrolysis hydrogen production system with waste heat utilization |
| CN114574877A (en) * | 2022-04-06 | 2022-06-03 | 中国船舶重工集团公司第七一八研究所 | Water electrolysis hydrogen production system with waste heat utilization |
| CN114807960A (en) * | 2022-04-13 | 2022-07-29 | 四川华能氢能科技有限公司 | Waste heat recovery management and control platform of large alkaline electrolyzed water hydrogen production device |
| CN114807962A (en) * | 2022-04-14 | 2022-07-29 | 华中科技大学 | Alkaline electrolyzed water hydrogen production system based on absorption heat pump and adjusting method thereof |
| CN114808029A (en) * | 2022-04-14 | 2022-07-29 | 华中科技大学 | Thermal management regulation system for hydrogen production by alkaline electrolyzed water and regulation method thereof |
| CN114808029B (en) * | 2022-04-14 | 2023-09-01 | 华中科技大学 | Thermal management adjusting system for alkaline water electrolysis hydrogen production and adjusting method thereof |
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