CN114717576B - Hydrogen production system and alkali liquor circulation method - Google Patents
Hydrogen production system and alkali liquor circulation method Download PDFInfo
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- CN114717576B CN114717576B CN202210493279.6A CN202210493279A CN114717576B CN 114717576 B CN114717576 B CN 114717576B CN 202210493279 A CN202210493279 A CN 202210493279A CN 114717576 B CN114717576 B CN 114717576B
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 36
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 36
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003513 alkali Substances 0.000 title abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 173
- 239000007788 liquid Substances 0.000 claims abstract description 120
- 238000000926 separation method Methods 0.000 claims abstract description 37
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims description 31
- 230000001105 regulatory effect Effects 0.000 claims description 31
- 238000004064 recycling Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000005514 two-phase flow Effects 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
- C25B15/02—Process control or regulation
- C25B15/023—Measuring, analysing or testing during electrolytic production
- C25B15/025—Measuring, analysing or testing during electrolytic production of electrolyte parameters
- C25B15/027—Temperature
-
- 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
-
- 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
- C25B9/67—Heating or cooling means
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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
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Automation & Control Theory (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention discloses a hydrogen production system, comprising: the device comprises an electrolytic tank, a first heat exchange unit, a gas-liquid separation unit and a second heat exchange unit; the outlet of the electrolytic tank is respectively connected with the hot fluid inlet of the first heat exchange unit and the hot fluid inlet of the second heat exchange unit, the hot fluid outlet of the second heat exchange unit is connected with the hot fluid inlet of the first heat exchange unit, and the hot fluid outlet of the first heat exchange unit is connected with the inlet of the gas-liquid separation unit; the liquid outlet of the gas-liquid separation unit is connected with the cold fluid inlet of the second heat exchange unit, and the cold fluid outlet of the second heat exchange unit is connected with the inlet of the electrolytic tank. According to the scheme, before the high-temperature gas-liquid mixture from the electrolytic tank enters the heat exchange cooler, one path of high-temperature alkali liquid is split for heating the returned low-temperature alkali liquid, so that the temperature of the electrolytic tank in normal operation is ensured, waste heat generated by the electrolytic tank is reused, and the hydrogen production efficiency of the system is improved. The invention also discloses an alkali liquor circulation method applying the hydrogen production system.
Description
Technical Field
The invention relates to the technical field of electrolytic hydrogen production, in particular to a hydrogen production system and an alkali liquor circulation method.
Background
At present, waste heat generated by alkali water electrolysis is subjected to heat exchange through an alkali liquor heat exchanger, and then heat dissipation is performed by using a cooling tower. Waste heat generated in the electrolytic hydrogen production process of the electrolytic tank cannot be utilized, and energy waste is increased.
Meanwhile, in order to improve the efficiency of gas-liquid separation, the gas-liquid two-phase flow at the outlet of the electrolytic tank needs to be cooled, and the lower the cooling temperature is, the better the gas-liquid separation effect is. If the temperature of the alkali liquor is too low, the alkali liquor needs to be properly heated before the alkali liquor is circulated into the electrolytic tank in order to ensure the normal working temperature of the electrolytic tank, so that the electrolytic efficiency inside the electrolytic tank is ensured.
Disclosure of Invention
In view of this, the present invention provides a hydrogen production system that reduces energy waste.
The invention also provides an alkali liquor circulation method applying the hydrogen production system.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a hydrogen production system, comprising: the device comprises an electrolytic tank, a first heat exchange unit, a gas-liquid separation unit and a second heat exchange unit;
the outlet of the electrolytic tank is respectively connected with the hot fluid inlet of the first heat exchange unit and the hot fluid inlet of the second heat exchange unit, the hot fluid outlet of the second heat exchange unit is connected with the hot fluid inlet of the first heat exchange unit, and the hot fluid outlet of the first heat exchange unit is connected with the inlet of the gas-liquid separation unit;
the liquid outlet of the gas-liquid separation unit is connected with the cold fluid inlet of the second heat exchange unit, and the cold fluid outlet of the second heat exchange unit is connected with the inlet of the electrolytic tank.
Preferably, the method further comprises: a circulation pump;
the circulating pump is arranged between the liquid outlet of the gas-liquid separation unit and the cold fluid inlet of the second heat exchange unit, and/or the circulating pump is arranged between the cold fluid outlet of the second heat exchange unit and the inlet of the electrolytic tank.
Preferably, the outlet of the electrolyzer comprises: a first outlet and a second outlet; the first outlet and the second outlet respectively correspond to different hot fluids; the first heat exchange unit includes: a first heat exchanger and a second heat exchanger; the gas-liquid separation unit includes: a first gas-liquid separator and a second gas-liquid separator; the second heat exchange unit includes: a third heat exchanger and a fourth heat exchanger;
the first outlet is respectively connected with the hot fluid inlet of the first heat exchanger and the hot fluid inlet of the third heat exchanger, the hot fluid outlet of the third heat exchanger is connected with the hot fluid inlet of the first heat exchanger, and the hot fluid outlet of the first heat exchanger is connected with the inlet of the first gas-liquid separator; the liquid outlet of the first gas-liquid separator is connected with the cold fluid inlet of the third heat exchanger, and the cold fluid outlet of the third heat exchanger is connected with the inlet of the electrolytic tank;
the second outlet is respectively connected with the hot fluid inlet of the second heat exchanger and the hot fluid inlet of the fourth heat exchanger, the hot fluid outlet of the fourth heat exchanger is connected with the inlet of the second heat exchanger, and the hot fluid outlet of the second heat exchanger is connected with the inlet of the second gas-liquid separator; the liquid outlet of the second gas-liquid separator is connected with the cold fluid inlet of the fourth heat exchanger, and the cold fluid outlet of the fourth heat exchanger and the cold fluid outlet of the third heat exchanger are connected with the inlet of the electrolytic tank in parallel.
Preferably, the outlet of the electrolyzer comprises: a first outlet and a second outlet; the first outlet and the second outlet respectively correspond to different hot fluids; the first heat exchange unit includes: a first heat exchanger and a second heat exchanger; the gas-liquid separation unit includes: the first gas-liquid separator and the second gas-liquid separator the second heat exchange unit comprises: a third heat exchanger and a fourth heat exchanger;
the first outlet is respectively connected with the hot fluid inlet of the first heat exchanger and the hot fluid inlet of the third heat exchanger, the hot fluid outlet of the third heat exchanger is connected with the hot fluid inlet of the first heat exchanger, and the hot fluid outlet of the first heat exchanger is connected with the inlet of the first gas-liquid separator; the liquid outlet of the first gas-liquid separator is connected with the cold fluid inlet of the third heat exchanger, and the cold fluid outlet of the third heat exchanger is connected with the inlet of the electrolytic tank;
the second outlet is respectively connected with the hot fluid inlet of the second heat exchanger and the hot fluid inlet of the fourth heat exchanger, the hot fluid outlet of the fourth heat exchanger is connected with the inlet of the second heat exchanger, and the hot fluid outlet of the second heat exchanger is connected with the inlet of the second gas-liquid separator; the liquid outlet of the second gas-liquid separator is connected with the cold fluid inlet of the fourth heat exchanger, and the cold fluid outlet of the fourth heat exchanger and the cold fluid outlet of the third heat exchanger are connected with the inlet of the electrolytic tank in parallel.
Preferably, the electrolyzer is an alkaline water electrolyzer, one of the first outlet and the second outlet corresponds to a hydrogen lye mixture, and the other corresponds to an oxygen lye mixture.
Preferably, the method further comprises: a first flow regulating valve and a second flow regulating valve;
the first flow regulating valve is arranged between the first outlet and the first heat exchanger hot fluid inlet, and/or the first flow regulating valve is arranged between the first outlet and the third heat exchanger hot fluid inlet;
the first flow regulating valve is arranged between the second outlet and the second heat exchanger hot fluid inlet, and/or the second flow regulating valve is arranged between the second outlet and the fourth heat exchanger hot fluid inlet.
Preferably, the method further comprises: a first gas scrubber and a second gas scrubber;
the gas outlet of the first gas-liquid separator is connected with the inlet of the first gas scrubber, and the gas outlet of the second gas-liquid separator is connected with the inlet of the second gas scrubber.
An alkali liquor circulation method adopting the hydrogen production system comprises the following steps:
enabling fluid at the outlet of the electrolytic tank to enter a hot fluid inlet of the first heat exchange unit and a hot fluid inlet of the second heat exchange unit respectively, and enabling hot fluid flowing out of the second heat exchange unit to enter the hot fluid inlet of the first heat exchange unit;
the hot fluid flowing out of the first heat exchange unit enters an inlet of the gas-liquid separation unit, the liquid flowing out of the gas-liquid separation unit enters a cold fluid inlet of the second heat exchange unit, and the liquid flowing out of the second heat exchange unit enters an inlet of the electrolytic tank.
Preferably, before the fluid at the outlet of the electrolytic cell enters the hot fluid inlet of the first heat exchange unit and the hot fluid inlet of the second heat exchange unit, respectively, the method further comprises:
and adjusting the proportion of the outlet of the electrolytic tank flowing to the first heat exchange unit and the second heat exchange unit through a flow regulating valve.
Preferably, after the hot fluid flowing out of the first heat exchange unit enters the inlet of the gas-liquid separation unit, the method further comprises:
the gas flowing out of the gas-liquid separation unit enters a gas scrubber.
According to the technical scheme, the high-temperature gas-liquid mixture from the electrolytic tank is split into one path of high-temperature alkali liquid for heating the returned low-temperature alkali liquid before entering the heat exchange cooler, so that the temperature of the electrolytic tank in normal operation is ensured, waste heat generated by the electrolytic tank is reused, and the hydrogen production efficiency of the system is improved. The invention also provides an alkali liquor circulation method, and the hydrogen production system has all the beneficial effects as described above, and the detailed description can be referred to in the previous description, and the detailed description is omitted.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hydrogen production system provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of another hydrogen production system provided in an embodiment of the present invention.
Wherein 1 is an electrolytic tank, 2-1 is a first flow regulating valve, 2-2 is a second flow regulating valve, 3-1 is a first heat exchanger, 3-2 is a second heat exchanger, 4-1 is a first gas-liquid separator, 4-2 is a second gas-liquid separator, 5-1 is a first gas scrubber, 5-2 is a second gas scrubber, 6 is a circulating pump, 7-1 is a third heat exchanger, and 7-2 is a fourth heat exchanger.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The hydrogen production system provided by the embodiment of the invention comprises: the structure of the electrolytic tank 1, the first heat exchange unit, the gas-liquid separation unit and the second heat exchange unit can be shown by referring to fig. 1 and 2;
the outlet of the electrolytic tank 1 is respectively connected with the hot fluid inlet of the first heat exchange unit and the hot fluid inlet of the second heat exchange unit, the hot fluid outlet of the second heat exchange unit is connected with the hot fluid inlet of the first heat exchange unit, and the hot fluid outlet of the first heat exchange unit is connected with the inlet of the gas-liquid separation unit;
the liquid outlet of the gas-liquid separation unit is connected with the cold fluid inlet of the second heat exchange unit, and the cold fluid outlet of the second heat exchange unit is connected with the inlet of the electrolytic tank 1.
According to the technical scheme, the high-temperature fluid from the electrolytic tank is split into one path of high-temperature fluid to heat the returned low-temperature fluid before entering the heat exchange cooler, so that the temperature of the electrolytic tank in normal operation is ensured, waste heat generated by the electrolytic tank is reused, and the hydrogen production efficiency of the system is improved.
The hydrogen production system provided by the embodiment of the invention further comprises: a circulation pump 6, the structure of which can be seen with reference to fig. 1 and 2;
the circulating pump 6 is arranged between the liquid outlet of the gas-liquid separation unit and the cold fluid inlet of the second heat exchange unit, and/or the circulating pump 6 is arranged between the cold fluid outlet of the second heat exchange unit and the inlet of the electrolytic tank 1, so that sufficient power is provided for the movement of the fluid, and the running efficiency is improved.
Further, the outlet of the electrolytic cell 1 comprises: a first outlet and a second outlet; the first outlet and the second outlet correspond to different hot fluids respectively, and the first heat exchange unit comprises: a first heat exchanger 3-1 and a second heat exchanger 3-2; the gas-liquid separation unit includes: a first gas-liquid separator 4-1 and a second gas-liquid separator 4-2; the second heat exchange unit includes: a third heat exchanger 7-1 and a fourth heat exchanger 7-2; the structure of which can be seen with reference to figure 1;
the first outlet is respectively connected with the hot fluid inlet of the first heat exchanger 3-1 and the hot fluid inlet of the third heat exchanger 7-1, the hot fluid outlet of the third heat exchanger 7-1 is connected with the hot fluid inlet of the first heat exchanger 3-1, and the hot fluid outlet of the first heat exchanger 3-1 is connected with the inlet of the first gas-liquid separator 4-1; the liquid outlet of the first gas-liquid separator 4-1 is connected with the cold fluid inlet of the third heat exchanger 7-1;
the second outlet is respectively connected with the hot fluid inlet of the second heat exchanger 3-2 and the hot fluid inlet of the fourth heat exchanger 7-2, the hot fluid outlet of the fourth heat exchanger 7-2 is connected with the inlet of the second heat exchanger 3-2, and the hot fluid outlet of the second heat exchanger 3-2 is connected with the inlet of the second gas-liquid separator 4-2; the liquid outlet of the second gas-liquid separator 4-2 is connected with the cold fluid inlet of the fourth heat exchanger 7-2, and the cold fluid outlet of the fourth heat exchanger 7-2 and the cold fluid outlet of the third heat exchanger 7-1 are connected with the inlet of the electrolytic tank 1 in parallel. By the arrangement, two waste heat recycling pipelines are arranged in parallel, and waste heat recycling of different heat fluids discharged by the electrolytic tank can be realized by the scheme.
As shown in fig. 2, the present embodiment also provides a series arrangement, the outlet of the electrolyzer 1 comprising: a first outlet and a second outlet; the first outlet and the second outlet respectively correspond to different hot fluids; the first heat exchange unit includes: a first heat exchanger 3-1 and a second heat exchanger 3-2; the gas-liquid separation unit includes: a first gas-liquid separator 4-1 and a second gas-liquid separator 4-2; the second heat exchange unit includes: a third heat exchanger 7-1 and a fourth heat exchanger 7-2;
the first outlet is respectively connected with the hot fluid inlet of the first heat exchanger 3-1 and the hot fluid inlet of the third heat exchanger 7-1, the hot fluid outlet of the third heat exchanger 7-1 is connected with the hot fluid inlet of the first heat exchanger 3-1, and the hot fluid outlet of the first heat exchanger 3-1 is connected with the inlet of the first gas-liquid separator 4-1; the liquid outlet of the first gas-liquid separator 4-1 is connected with the cold fluid inlet of the third heat exchanger 7-1, and the cold fluid outlet of the third heat exchanger 7-1 is connected with the inlet of the electrolytic tank 1;
the second outlet is respectively connected with the hot fluid inlet of the second heat exchanger 3-2 and the hot fluid inlet of the fourth heat exchanger 7-2, the hot fluid outlet of the fourth heat exchanger 7-2 is connected with the inlet of the second heat exchanger 3-2, and the hot fluid outlet of the second heat exchanger 3-2 is connected with the inlet of the second gas-liquid separator 4-2; the liquid outlet of the second gas-liquid separator 4-2 is connected with the cold fluid inlet of the fourth heat exchanger 7-2, and the cold fluid outlet of the fourth heat exchanger 7-2 and the cold fluid outlet of the third heat exchanger 7-1 are connected with the inlet of the electrolytic tank 1 in series. By the arrangement, two waste heat recycling pipelines are arranged in series, and waste heat recycling of different heat fluids discharged by the electrolytic tank can be realized by the scheme.
Specifically, the electrolytic tank 1 is an alkaline water electrolytic tank, one of the first outlet and the second outlet corresponds to a hydrogen alkali solution mixture, and the other corresponds to an oxygen alkali solution mixture, and is suitable for an alkaline water electrolytic hydrogen production device.
The hydrogen production system provided by the embodiment of the invention further comprises: a first flow rate adjusting valve 2-1 and a second flow rate adjusting valve 2-2, the structure of which can be seen with reference to fig. 1 and 2;
wherein the first flow regulating valve 2-1 is arranged between the first outlet and the hot fluid inlet of the first heat exchanger 3-1, and/or the first flow regulating valve 2-1 is arranged between the first outlet and the hot fluid inlet of the third heat exchanger 7-1, so that the flow of the gas-liquid mixture entering the third heat exchanger 7-1 can be regulated;
the first flow regulating valve 2-2 is arranged between the second outlet and the inlet of the second heat exchanger 3-2, and/or the second flow regulating valve 2-2 is arranged between the second outlet and the hot fluid inlet of the fourth heat exchanger 7-2, so that the flow rate of the gas-liquid mixture entering the fourth heat exchanger 7-2 can be regulated.
The hydrogen production system provided by the embodiment of the invention further comprises: a first gas scrubber 5-1 and a second gas scrubber 5-2, the structure of which can be shown with reference to fig. 1 and 2;
wherein the gas outlet of the first gas-liquid separator 4-1 is connected to the inlet of the first gas scrubber 5-1, and the outlet of the first gas scrubber 5-1 is directed to purification or venting; the gas outlet of the second gas-liquid separator 4-2 is connected to the inlet of the second gas scrubber 5-2, the outlet of the second gas scrubber 5-2 being directed to purification or venting.
The embodiment of the invention also provides an alkali liquor circulation method, which adopts the hydrogen production system, and comprises the following steps:
enabling fluid at the outlet of the electrolytic tank 1 to enter a hot fluid inlet of the first heat exchange unit and a hot fluid inlet of the second heat exchange unit respectively, and enabling hot fluid flowing out of the second heat exchange unit to enter the hot fluid inlet of the first heat exchange unit;
the hot fluid flowing out of the first heat exchange unit enters the inlet of the gas-liquid separation unit, the liquid flowing out of the gas-liquid separation unit enters the cold fluid inlet of the second heat exchange unit, and the liquid flowing out of the second heat exchange unit enters the inlet of the electrolytic tank 1. The alkaline liquor circulation method of the scheme has all the beneficial effects as described above due to the adoption of the hydrogen production system, and the detailed description can be referred to in the previous description, and the detailed description is omitted.
Further, before the fluid at the outlet of the electrolytic tank 1 enters the hot fluid inlet of the first heat exchange unit and the hot fluid inlet of the second heat exchange unit respectively, the method further comprises:
the proportion of the outlet flow of the electrolytic tank 1 to the first heat exchange unit and the second heat exchange unit is regulated by a flow regulating valve. The flow rate of the high temperature gas-liquid mixture passing through the second heat exchange unit can be regulated so as to control the temperature of the alkaline liquor at the inlet of the electrolytic tank 1.
Specifically, after the hot fluid flowing out of the first heat exchange unit enters the inlet of the gas-liquid separation unit, the method further comprises:
the gas flowing out of the gas-liquid separation unit enters a gas scrubber.
The present solution is further described in connection with the following complete embodiments:
the gas-liquid mixture at the outlet of the electrolytic tank 1 is divided into two paths, one path passes through the flow regulating valves (2-1 and 2-2) to go to the alkali liquor coolers (3-1 and 3-2), and the other path passes through the bypass pipeline to enter the heat exchangers (7-1 and 7-2); by means of the flow regulating valves (2-1 and 2-2), the flow rate of the gas-liquid mixture entering the heat exchangers (7-1 and 7-2) can be regulated; cooling the alkali liquor through alkali liquor coolers (3-1 and 3-2) to ensure the temperature of the gas-liquid mixture entering the gas-liquid separators (4-1 and 4-2); the lye separated by the separators (4-1 and 4-2) is converged and pumped into the electrolytic tank again through the lye circulating pump 6; after the gas is separated, the gas washed by the scrubbers (5-1 and 5-2) can enter a purifying or gas collecting device or is exhausted; the heat exchangers (7-1 and 7-2) can be arranged in parallel or in series; the system is provided with a pure water supplementing system (not shown).
The advantage of this scheme lies in:
1. the cooling temperature of the gas-liquid mixture can be set lower by the alkali liquor coolers (3-1 and 3-2), so that the separation efficiency is improved; meanwhile, the temperature of the inlet of the electrolytic tank 1 is not too low due to the lower alkali liquor temperature, so that the improvement of the separation efficiency is ensured, and the electrolytic tank 1 is not influenced;
2. the flow rate of the high-temperature gas-liquid mixture in the heat exchangers (7-1 and 7-2) can be regulated through the flow regulating valves (2-1 and 2-2), so that the temperature of the alkaline liquor at the inlet of the electrolytic tank 1 is controlled;
3. the waste heat generated by the electrolytic tank 1 can be reused for comprehensive utilization, and the hydrogen production efficiency of the system is improved.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A hydrogen production system, comprising: the device comprises an electrolytic tank (1), a first heat exchange unit, a gas-liquid separation unit and a second heat exchange unit;
the outlet of the electrolytic tank (1) is respectively connected with the hot fluid inlet of the first heat exchange unit and the hot fluid inlet of the second heat exchange unit, the hot fluid outlet of the second heat exchange unit is connected with the hot fluid inlet of the first heat exchange unit, and the hot fluid outlet of the first heat exchange unit is connected with the inlet of the gas-liquid separation unit;
the liquid outlet of the gas-liquid separation unit is connected with the cold fluid inlet of the second heat exchange unit, and the cold fluid outlet of the second heat exchange unit is connected with the inlet of the electrolytic tank (1).
2. The hydrogen production system of claim 1, further comprising: a circulation pump (6);
the circulating pump (6) is arranged between the liquid outlet of the gas-liquid separation unit and the cold fluid inlet of the second heat exchange unit, and/or the circulating pump (6) is arranged between the cold fluid outlet of the second heat exchange unit and the inlet of the electrolytic tank (1).
3. Hydrogen production system according to claim 1, characterized in that the outlet of the electrolyzer (1) comprises: a first outlet and a second outlet; the first outlet and the second outlet respectively correspond to different hot fluids; the first heat exchange unit includes: a first heat exchanger (3-1) and a second heat exchanger (3-2); the gas-liquid separation unit includes: a first gas-liquid separator (4-1) and a second gas-liquid separator (4-2); the second heat exchange unit includes: a third heat exchanger (7-1) and a fourth heat exchanger (7-2);
the first outlet is respectively connected with the hot fluid inlet of the first heat exchanger (3-1) and the hot fluid inlet of the third heat exchanger (7-1), the hot fluid outlet of the third heat exchanger (7-1) is connected with the hot fluid inlet of the first heat exchanger (3-1), and the hot fluid outlet of the first heat exchanger (3-1) is connected with the inlet of the first gas-liquid separator (4-1); the liquid outlet of the first gas-liquid separator (4-1) is connected with the cold fluid inlet of the third heat exchanger (7-1), and the cold fluid outlet of the third heat exchanger (7-1) is connected with the inlet of the electrolytic tank (1);
the second outlet is respectively connected with a hot fluid inlet of the second heat exchanger (3-2) and a hot fluid inlet of the fourth heat exchanger (7-2), the hot fluid outlet of the fourth heat exchanger (7-2) is connected with the inlet of the second heat exchanger (3-2), and the hot fluid outlet of the second heat exchanger (3-2) is connected with the inlet of the second gas-liquid separator (4-2); the liquid outlet of the second gas-liquid separator (4-2) is connected with the cold fluid inlet of the fourth heat exchanger (7-2), and the cold fluid outlet of the fourth heat exchanger (7-2) and the cold fluid outlet of the third heat exchanger (7-1) are connected in parallel with the inlet of the electrolytic tank (1).
4. Hydrogen production system according to claim 1, characterized in that the outlet of the electrolyzer (1) comprises: a first outlet and a second outlet; the first outlet and the second outlet respectively correspond to different hot fluids; the first heat exchange unit includes: a first heat exchanger (3-1) and a second heat exchanger (3-2); the gas-liquid separation unit includes: a first gas-liquid separator (4-1) and a second gas-liquid separator (4-2); the second heat exchange unit includes: a third heat exchanger (7-1) and a fourth heat exchanger (7-2);
the first outlet is respectively connected with the hot fluid inlet of the first heat exchanger (3-1) and the hot fluid inlet of the third heat exchanger (7-1), the hot fluid outlet of the third heat exchanger (7-1) is connected with the hot fluid inlet of the first heat exchanger (3-1), and the hot fluid outlet of the first heat exchanger (3-1) is connected with the inlet of the first gas-liquid separator (4-1); the liquid outlet of the first gas-liquid separator (4-1) is connected with the cold fluid inlet of the third heat exchanger (7-1), and the cold fluid outlet of the third heat exchanger (7-1) is connected with the inlet of the electrolytic tank (1);
the second outlet is respectively connected with a hot fluid inlet of the second heat exchanger (3-2) and a hot fluid inlet of the fourth heat exchanger (7-2), the hot fluid outlet of the fourth heat exchanger (7-2) is connected with the inlet of the second heat exchanger (3-2), and the hot fluid outlet of the second heat exchanger (3-2) is connected with the inlet of the second gas-liquid separator (4-2); the liquid outlet of the second gas-liquid separator (4-2) is connected with the cold fluid inlet of the fourth heat exchanger (7-2), and the cold fluid outlet of the fourth heat exchanger (7-2) and the cold fluid outlet of the third heat exchanger (7-1) are connected in series with the inlet of the electrolytic tank (1).
5. Hydrogen production system according to claim 3 or 4, characterized in that the electrolyzer (1) is an alkaline water electrolyzer, one of the first outlet and the second outlet corresponding to a hydrogen lye mixture and the other to an oxygen lye mixture.
6. The hydrogen production system of claim 3 or 4, further comprising: a first flow rate regulating valve (2-1) and a second flow rate regulating valve (2-2);
the first flow regulating valve (2-1) is arranged between the first outlet and the first heat exchanger (3-1) hot fluid inlet, and/or the first flow regulating valve (2-1) is arranged between the first outlet and the third heat exchanger (7-1) hot fluid inlet;
the second flow regulating valve (2-2) is arranged between the second outlet and the hot fluid inlet of the second heat exchanger (3-2), and/or the second flow regulating valve (2-2) is arranged between the second outlet and the hot fluid inlet of the fourth heat exchanger (7-2).
7. The hydrogen production system of claim 3 or 4, further comprising: a first gas scrubber (5-1) and a second gas scrubber (5-2);
the gas outlet of the first gas-liquid separator (4-1) is connected with the inlet of the first gas scrubber (5-1), and the gas outlet of the second gas-liquid separator (4-2) is connected with the inlet of the second gas scrubber (5-2).
8. A process for recycling lye using a hydrogen production system as claimed in any one of claims 1 to 7, comprising the steps of:
enabling fluid at the outlet of the electrolytic tank (1) to enter a hot fluid inlet of the first heat exchange unit and a hot fluid inlet of the second heat exchange unit respectively, and enabling hot fluid flowing out of the second heat exchange unit to enter the hot fluid inlet of the first heat exchange unit;
the hot fluid flowing out of the first heat exchange unit enters an inlet of the gas-liquid separation unit, the liquid flowing out of the gas-liquid separation unit enters a cold fluid inlet of the second heat exchange unit, and the liquid flowing out of the second heat exchange unit enters an inlet of the electrolytic tank (1).
9. The lye recycling process according to claim 8, characterized in that before said letting the fluid at the outlet of the electrolyzer (1) into the hot fluid inlet of the first heat exchange unit and the hot fluid inlet of the second heat exchange unit, respectively, it further comprises:
the proportion of the outlet flow of the electrolytic tank (1) to the first heat exchange unit and the second heat exchange unit is regulated by a flow regulating valve.
10. The lye recycling method according to claim 8, further comprising, after said passing the hot fluid exiting the first heat exchange unit into the inlet of the gas-liquid separation unit:
the gas flowing out of the gas-liquid separation unit enters a gas scrubber.
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