CN114150331A - An electrolysis hydrogen production waste heat utilization system - Google Patents
An electrolysis hydrogen production waste heat utilization system Download PDFInfo
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- CN114150331A CN114150331A CN202111601777.XA CN202111601777A CN114150331A CN 114150331 A CN114150331 A CN 114150331A CN 202111601777 A CN202111601777 A CN 202111601777A CN 114150331 A CN114150331 A CN 114150331A
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 55
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 55
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 28
- 239000002918 waste heat Substances 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000010248 power generation Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 239000003792 electrolyte Substances 0.000 claims description 50
- 239000007789 gas Substances 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 24
- 239000004065 semiconductor Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 2
- 239000008151 electrolyte solution Substances 0.000 claims 1
- 230000003134 recirculating effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 10
- 238000012546 transfer Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 description 12
- 238000011161 development Methods 0.000 description 4
- 230000005678 Seebeck effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
- C25B15/02—Process control or regulation
- C25B15/021—Process control or regulation of heating or cooling
-
- 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
- C25B15/083—Separating products
-
- 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
- C25B15/087—Recycling of electrolyte to electrochemical cell
-
- 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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- 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
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The application provides an electrolysis hydrogen production waste heat utilization system, includes electrolysis hydrogen production system, circulative cooling system and the thermoelectric power generation system through circulating water pipeline end to end connection, circulative cooling system's circulating water passes through the circulating water pipeline flows through electrolysis hydrogen production system carries out the heat transfer, circulating water after the heat transfer intensifies flows through in the electrolysis hydrogen production system thermoelectric power generation system carries out the heat supply electricity generation, circulating water in the thermoelectric power generation system passes through the circulating water pipeline backward flow extremely circulative cooling system retrieves the used heat that produces in the operation process of electrolysis water hydrogen production system through setting up thermoelectric power generation system, and the heat supply source in the thermoelectric power generation system utilizes the difference in temperature of production between the thermoelectric device to carry out thermoelectric conversion, realizes used heat to the conversion of electric energy. The system has reasonable design and simple use, improves the energy utilization efficiency, and has clean and pollution-free working process.
Description
Technical Field
The application relates to the technical field of electrolytic hydrogen production, in particular to an electrolytic hydrogen production waste heat utilization system.
Background
With the development of social economy, the problems of fossil energy shortage and environmental pollution are increasingly highlighted, and energy transformation is imperative. The hydrogen energy is a secondary energy source which is wide in source, clean, free of carbon, flexible, efficient and rich in application scenes, and is an important carrier for supporting energy transformation and construction of a modern energy system. The development of hydrogen energy is an important route to achieve carbon peak-to-carbon neutralization. Under the background of large-scale development of wind power and photovoltaic renewable energy sources at present, renewable energy sources are receiving more and more extensive attention to hydrogen production by water electrolysis. However, compared with the hydrogen production by fossil energy, the hydrogen production by water electrolysis by renewable energy is still relatively expensive in terms of production operation cost and equipment investment cost, wherein the power cost accounts for the largest percentage and is about 40% -60%. Therefore, reducing the system energy consumption in the process of producing hydrogen by electrolyzing water is crucial to the industrial development of the process.
In the process of producing hydrogen by electrolyzing water, because parts such as electrodes, diaphragms, electrolyte and the like have certain resistance, the temperature of the electrolyte in the electrolytic cell can be continuously raised by the current thermal effect of the parts, so in order to stabilize the working temperature of the electrolytic cell within a proper range, the electrolyte from the electrolytic cell needs to be cooled firstly after being separated by a gas-liquid separator, and then can flow back to the electrolytic cell. At present, the part of waste heat is not recycled in industrial application, and the energy loss of the water electrolysis hydrogen production system is further increased.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the present application aims to provide an electrolytic hydrogen production waste heat utilization system, which is provided with a thermoelectric power generation system to recover waste heat generated in the operation process of the electrolytic hydrogen production system, and the waste heat is used as a heat supply source in the thermoelectric power generation system, and the temperature difference generated between thermoelectric devices is utilized to perform thermoelectric conversion, so that the conversion of the waste heat into electric energy is realized. The system has reasonable design and simple use, improves the energy utilization efficiency, and has clean and pollution-free working process.
For reaching above-mentioned purpose, the electrolysis hydrogen production waste heat utilization system that this application provided includes electrolysis hydrogen production system, circulative cooling system and the thermoelectric power generation system through circulating water pipeline end to end connection, circulative cooling system's circulating water passes through the circulating water pipeline flows through electrolysis hydrogen production system carries out the heat transfer, circulating water flow through after the heat transfer intensifies in the electrolysis hydrogen production system thermoelectric power generation system carries out the heat supply electricity generation, circulating water in the thermoelectric power generation system through the circulating water pipeline backward flow extremely circulative cooling system.
Furthermore, the electrolytic hydrogen production system comprises an electrolytic tank, a gas-liquid separator and an electrolyte heat exchanger which are connected end to end through an electrolyte pipeline, the electrolytic tank is communicated with the gas-liquid separator through an electrolyte pipeline, the gas-liquid separator is communicated with the electrolyte heat exchanger through an electrolyte pipeline, separated alkali liquor is introduced into the electrolyte heat exchanger through the electrolyte pipeline, a circulating water pipeline passes through the electrolyte heat exchanger, the alkali liquor and the circulating water exchange heat in the electrolyte heat exchanger, and the alkali liquor after heat exchange in the electrolyte heat exchanger flows back to the electrolytic tank.
Further, the electrolytic hydrogen production system further comprises a gas cooler, the gas-liquid separator is communicated with the gas cooler through a gas pipeline, the gas-liquid separator introduces gas into the gas cooler through a gas pipeline, the circulating water pipeline passes through the gas cooler, and the circulating water and the gas exchange heat in the gas cooler.
Further, the gas cooler and the electrolyte heat exchanger are of a dividing wall type heat exchange structure.
Further, the electrolyzer is an alkaline electrolyzer or a PEM electrolyzer.
Furthermore, a thermometer and a regulating valve are arranged on the electrolyte pipeline and the circulating water pipeline.
Further, the thermoelectric power generation system includes a semiconductor thermoelectric generator.
Furthermore, the operation temperature range of the thermoelectric power generation system is 30-300 ℃.
Further, a circulating pump is arranged on an electrolyte pipeline between the electrolyte heat exchanger and the electrolytic bath.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an electrolytic hydrogen production waste heat utilization system according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the application include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Fig. 1 is a schematic structural diagram of an electrolytic hydrogen production waste heat utilization system according to an embodiment of the present application.
Referring to fig. 1, an electrolytic hydrogen production waste heat utilization system includes an electrolytic hydrogen production system 1, a circulating cooling system 2 and a thermoelectric power generation system 3 which are connected end to end through a circulating water pipeline, circulating water of the circulating cooling system 2 flows through the electrolytic hydrogen production system 1 through the circulating water pipeline for heat exchange, circulating water after heat exchange and temperature rise in the electrolytic hydrogen production system 1 flows through the thermoelectric power generation system 3 for heat supply and power generation, and circulating water in the thermoelectric power generation system 3 flows back to the circulating cooling system 2 through the circulating water pipeline.
In this embodiment, the circulating cooling system 2, the gas cooler 7, the electrolyte heat exchanger 6, and the thermoelectric power generation system 3 form a circulating water circulation loop, and the waste heat of the electrolytic hydrogen production system 1 is brought into the thermoelectric power generation system 3 by the flow of circulating water to generate power, thereby improving the utilization efficiency of energy. The working principle of the thermoelectric power generation system 3 is based on the Seebeck effect, heat energy is converted into electric energy by utilizing the temperature difference generated between thermoelectric devices, the joint end of two semiconductors in the thermoelectric power generation system 3 is arranged at high temperature, the other end in the low-temperature environment can obtain electromotive force, circulating water heated after heat exchange enters the high-temperature end in the thermoelectric power generation system, the Seebeck effect is generated in the thermoelectric power generation system due to the temperature difference, and the conversion of the heat energy into the electric energy is realized. The generated electric energy can be supplied to an electrolytic tank for water electrolysis to produce hydrogen, and can also be stored by a storage battery and sold as a product.
It can be understood that the circulating water of the circulating cooling system 2 flows through the electrolytic hydrogen production system 1 and the thermoelectric power generation system 3 through the circulating water pipeline and only exchanges heat with them, the circulating cooling system 2 is used as an independent circulating water circulation loop system and does not exchange substances with the electrolytic hydrogen production system 1 and the thermoelectric power generation system 3, so as to ensure the recycling of the circulating water, and preferably, the circulating cooling system comprises a circulating cooling tower and a circulating water pipeline connected with the circulating cooling tower. The circulating cooling tower is used as a transfer junction of circulating water and used for storing and supplementing the circulating water and is distributed everywhere through circulating water pipelines.
Electrolytic hydrogen production system 1 includes electrolysis trough 4, vapour and liquid separator 5 and the electrolyte heat exchanger 6 through electrolyte pipeline end to end connection, electrolysis trough 4 passes through electrolyte pipeline way vapour and liquid separator 5 lets in the gas-liquid mixture, vapour and liquid separator 5 passes through electrolyte pipeline way electrolyte heat exchanger 6 lets in the alkali lye after the separation, the circulating water pipeline passes through electrolyte heat exchanger 6, alkali lye with the circulating water is in carry out the heat transfer in the electrolyte heat exchanger 6, the alkali lye after the heat transfer in the electrolyte heat exchanger 6 flows back extremely in the electrolysis trough 4.
In this embodiment, the electrolytic cell 4, the gas-liquid separator 5 and the electrolyte heat exchanger 6 are connected through an electrolyte pipeline to form an electrolyte circulation loop, a gas-liquid mixture in the electrolytic cell 4 is separated, gas is introduced into the gas cooler 5, alkali liquor flows back to the electrolytic cell 4, the consumption of the alkali liquor is reduced, in the alkali liquor backflow process, heat exchange and cooling are performed through a circulating water pipeline, the electrolytic cell fault caused by overheating of the alkali liquor is avoided, circulating water after heat exchange flows through the thermoelectric power generation system to generate power, and waste heat of the electrolytic hydrogen production system is fully utilized. The heat utilization efficiency of the system is improved.
Electrolytic hydrogen production system 1 still includes gas cooler 7, vapour and liquid separator 5 through gas pipeline with gas cooler 7 intercommunication, vapour and liquid separator 5 passes through the gas pipeline to gas cooler 7 lets in gas, the circulating water pipeline passes through gas cooler 7, circulating water with gas is in carry out the heat transfer in the gas cooler 7.
In this embodiment, gas after gas-liquid separation still has higher temperature, need set up gas cooler 7 and cool off it to in order to store and utilize, the circulating line of this application passes through gas cooler 7, can arrange in the gas line outside and cool down gas in spiral winding's form, has better cooling effect, in other embodiments of course, also can arrange in other forms, this application does not do the restriction to this.
The gas cooler 7 and the electrolyte heat exchanger 6 are of a dividing wall type heat exchange structure. I.e. the cold and hot fluids are separated by a solid wall (pipe or plate) and do not mix, but exchange heat through the partition. The heat exchange is carried out while avoiding the mixing of liquid, and the independence of heat exchange substances is ensured.
The electrolyzer 4 is an alkaline electrolyzer or a PEM electrolyzer. The electrolytic cell adopting the type has higher electrolytic efficiency, is widely applied and is easy to purchase equipment.
And a thermometer and an adjusting valve are arranged on the electrolyte pipeline and the circulating water pipeline. The monitoring of the system operation temperature is realized by arranging thermometers on the electrolyte pipeline and the circulating water pipeline, and the regulating valve can regulate and control the flow of liquid in the pipeline through the opening degree, so that the temperature is controlled.
The operating temperature range of the thermoelectric power generation system 3 is 30-300 ℃. In the temperature range, the thermoelectric power generation system has higher power generation efficiency.
The thermoelectric power generation system 3 includes a semiconductor thermoelectric generator. Two semiconductor thermoelectric materials with high thermoelectric figure of merit can be used to convert thermal energy directly into electrical energy. Small volume, long service life, no noise in operation and no need of maintenance. The thermoelectric power generation system can also comprise a heat insulation layer and a heat dissipation component, which are important temperature field components for providing working temperature difference for the semiconductor thermoelectric device and are the basis for normal and efficient work of the semiconductor thermoelectric device.
And a circulating pump is arranged on an electrolyte pipeline between the electrolyte heat exchanger 6 and the electrolytic bath 4. The arrangement of the circulating pump can improve the flowing speed of the alkali liquor in the alkali liquor circulating loop, thereby improving the electrolysis efficiency.
Hydrogen and oxygen generated by water decomposition in the electrolytic bath 4 enter a gas-liquid separator 5 under the entrainment of electrolyte, and the separated hydrogen and oxygen enter a gas cooler 7 and then are discharged out of a pipeline; the separated electrolyte passes through an electrolyte heat exchanger 6 and then is pumped back to the electrolytic bath 4; circulating water of the circulating cooling system 2 passes through the gas cooler 7 and the electrolyte heat exchanger 6 in sequence to cool hydrogen, oxygen and electrolyte, and meanwhile, the temperature of the circulating water is increased; then the circulating water enters the high-temperature end of the thermoelectric power generation system 3, and the Seebeck effect is generated in the thermoelectric power generation system due to the temperature difference, so that the conversion of heat energy to electric energy is realized.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (9)
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| CN202111601777.XA CN114150331A (en) | 2021-12-24 | 2021-12-24 | An electrolysis hydrogen production waste heat utilization system |
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| CN202111601777.XA CN114150331A (en) | 2021-12-24 | 2021-12-24 | An electrolysis hydrogen production waste heat utilization system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114807959A (en) * | 2022-03-15 | 2022-07-29 | 中国船舶重工集团公司第七一八研究所 | High-efficiency hydrogen production system suitable for wide power fluctuation |
| CN114990602A (en) * | 2022-05-12 | 2022-09-02 | 中国华能集团清洁能源技术研究院有限公司 | Desalted water integrated system for water electrolysis hydrogen production device |
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