CN111313048B - Seawater acidification electrolytic cell flow guide polar plate structure not easy to separate chlorine - Google Patents
Seawater acidification electrolytic cell flow guide polar plate structure not easy to separate chlorine Download PDFInfo
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- CN111313048B CN111313048B CN201811513704.3A CN201811513704A CN111313048B CN 111313048 B CN111313048 B CN 111313048B CN 201811513704 A CN201811513704 A CN 201811513704A CN 111313048 B CN111313048 B CN 111313048B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
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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
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Abstract
The invention relates to a polar plate structure of a seawater acidification electrolytic cell which is not easy to separate chlorine, and the flow guide polar plate comprises a flow guide monopole or a bipolar plate, wherein the flow guide monopole or the bipolar plate consists of a single-sided water diversion flow field metal plate, an inlet and outlet insulating plate with three cavities, the flow guide bipolar plate consists of a front water diversion flow field metal plate, a back water diversion flow field metal plate and an inlet and outlet insulating plate with three cavities, the cavity inlet and outlet plates comprise a seawater fluid inlet and an polar liquid fluid outlet, a flow guide groove and a connecting groove connected with the flow guide groove are arranged between the polar liquid fluid inlet and the polar liquid fluid outlet, and the flow guide groove and the connecting groove are both designed into a straight groove or a nearly straight groove.
Description
Technical Field
The invention relates to water electrolysis, in particular to a guide polar plate structure of a seawater acidification electrolytic cell which is not easy to separate chlorine.
Background
Throughout the environment, atmospheric carbon dioxide is in equilibrium with the ocean at all times. The total content of carbon element in seawater is as high as 38000 kilo hundred million tons, about 2-3% exists in a form that carbon dioxide gas is dissolved, and the remaining 97-98% exists in a combined state of bicarbonate and carbonate. The ocean carbon source is about 175 times the atmospheric carbon source estimated from the current world ocean volume, and the ocean carbon dioxide concentration (100mg/L) is about 140 times the atmospheric concentration (0.77mg/L) when measured in terms of mass to volume ratios. Dissolved HCO in seawater3 -With CO3 2-Determine the pH value of seawater with the depth of more than 100m and CO2There is a balance of:
[CO2]T＝[CO2(g)]+[HCO3 -]+[CO3 2-]
therefore, the high-concentration CO in the seawater is efficiently utilized in an energy-saving manner2Has profound significance for environmental protection: first, CO is removed from seawater2Can indirectly shadowIn response to the carbon dioxide content of the atmosphere, the new seawater medium produced will be able to absorb more carbon dioxide from the atmosphere without affecting the pH of the ocean, and, in addition, absorb CO from the seawater2Compared with the traditional alkali liquor absorption, the energy consumption is lower, and the method can be directly applied to the fields of biological carbon fixation, low-temperature curing and the like. Currently, CO dissolved in seawater (or water) is removed2The main methods of (1) are as follows: electrochemical methods, heating/pressure reduction methods, chemical precipitation methods, bubbling methods, anion exchange membrane methods, and the like. The electrochemical method has the advantages of high efficiency, high purity and the like, and becomes a research hotspot.
Currently, U.S. patent application publications [ US 20130206605 a1 ] and [ US 20140238869 a1 ] acidify seawater electrochemically to extract CO2And preparation of H2In the two specifications, the electrode plate of the seawater acidification electrolytic cell is separated into a seawater cavity, an anode liquid cavity and a cathode liquid cavity through an ion exchange membrane, and after the seawater is acidified, CO is extracted from the acidified seawater2The device is used for extracting CO2In the case of the method, the carbon dioxide removal rate is 70% and the purity is low.
Disclosure of Invention
Experiments show that when a direct current power supply is loaded in the conventional seawater acidification electrolytic cell, chlorine evolution reaction can occur on two sides of an ion exchange membrane on the inlet side and the outlet side of seawater, so that chlorine is generated in the acidified seawater, the purity of separated carbon dioxide is influenced, and CO is required to be treated in operation2The purification requires additional equipment, which results in low removal efficiency and purity.
Aiming at the technical problems, the invention provides a polar plate structure of a seawater acidification electrolytic cell, which can electrolyze water, enable fluid to flow uniformly and smoothly, is assembled in the seawater acidification electrolytic cell, can prevent ion exchange reactions on two sides of an ion exchange membrane of an inlet channel and an outlet channel of a seawater cavity, is not easy to separate chlorine, simultaneously prevents ion exchange reactions on two sides of the ion exchange membrane of the inlet channel and the outlet channel of a polar liquid cavity, and improves the purity of hydrogen and oxygen separation.
In order to achieve the purpose, the invention adopts the technical scheme that:
the flow guide polar plate structure of the seawater acidification electrolytic cell is a unipolar plate or a bipolar plate; the flow guide polar plate is formed by combining a flow field plate positioned in the center and an electrode liquid inlet and outlet plate positioned on the peripheral side; the flow field plate is a single-sided flow field or a double-sided flow field; the flow field has a flow channel; the flow field plate is made of metal; the electrode liquid inlet and outlet plate is an insulating plate or a plate for insulating the electrode liquid inlet and outlet.
The unipolar plate is characterized in that only one of two side surfaces of a polar plate is provided with a flow field; bipolar plates are those in which flow fields are provided on both sides (front and back) of the plate.
The flow guide bipolar plate is an integral plate comprising a front side water diversion flow field and a back side water diversion flow field, or a plate formed by welding the front side water diversion flow field and the back side water diversion flow field.
As a preferred technical scheme, the electrode liquid inlet and outlet plate is provided with three groups of inlet and outlet ports: seawater inlet, seawater outlet, anode electrode liquid inlet, anode electrode liquid outlet, cathode electrode liquid inlet, and cathode electrode liquid outlet.
As a preferred technical scheme, the anode solution is deionized water; the cathode electrode liquid is deionized water or softened water for removing metal ions.
As a preferred technical scheme, the seawater inlet and the seawater outlet, the anode electrode liquid inlet and the anode electrode liquid outlet, and the cathode electrode liquid inlet and the cathode electrode liquid outlet are respectively arranged in point symmetry with the center of the electrode liquid inlet and outlet plate as a central point.
As a preferred technical scheme, the seawater inlet, the anode electrode liquid inlet and the cathode electrode liquid inlet are arranged on the same side or different sides of the electrode liquid inlet and outlet plate.
As a preferable technical scheme, the inlet/outlet of the anode/cathode of the electrode liquid inlet/outlet plate is also respectively provided with a diversion trench and a connecting trench; the anode solution sequentially enters a flow channel of the flow field plate through an anode solution inlet, an anode inlet diversion trench and an anode inlet connecting trench and then flows to an anode solution outlet through an anode outlet connecting trench and an anode outlet diversion trench; and the cathode electrode liquid sequentially enters the flow channel of the flow field plate through the cathode electrode liquid inlet, the cathode inlet diversion trench and the cathode inlet connecting trench and then flows to the cathode electrode liquid outlet through the cathode outlet connecting trench and the cathode outlet diversion trench.
As a preferred technical scheme, the diversion trench and the connection trench are both designed as straight-flow trenches or nearly straight-flow trenches.
As a preferred technical scheme, the flow field plate is a metal plate with a coating layer on the surface; the preferable material of the metal is titanium or stainless steel; the coating layer is a high-conductivity corrosion-resistant material layer, the material is preferably one or the combination of more than two of Pt, Ru or Ir, and the thickness of the coating layer is 1-5 mu m.
As a preferred technical solution, the flow channels of the flow field are parallel flow channels or floating point flow channels.
Preferably, the thickness of the electrode liquid inlet and outlet plate is consistent with that of the flow field plate.
The electrode liquid inlet and outlet, the diversion trench, the connecting trench and the surface of the flat plate around the outside of the flow field of the electrode liquid inlet and outlet plate are provided with annular sealing grooves, and the electrode liquid inlet and outlet channel, the diversion trench and the water diversion flow field are positioned in an annular area surrounded by the sealing grooves.
The electrode liquid inlet and outlet plate is provided with a sealing groove, the depth of the groove is 0.2-0.6mm, and sealing is realized by adopting a line sealing or surface sealing mode, so that liquid leakage or liquid channeling is prevented.
The diversion trench (which may be provided in a plurality of strips) is used to divert the polar liquid to a connecting trench, which is used to distribute the polar liquid to flow channels in the flow field.
And the anode liquid enters into one surface of the electrode liquid inlet and outlet plate. The anode electrode liquid inlet is communicated with a plurality of anode electrode liquid inlet diversion trenches, and the cathode electrode liquid inlet is provided with no diversion trenches. The anode liquid inlet diversion trench enters a flow channel of the flow field through the connecting trench, then is collected into the outlet connecting trench and is connected through the outlet diversion trench; flows to the anode liquid outlet.
And cathode liquid is fed into the other side of the electrode liquid inlet/outlet plate. The cathode pole liquid inlet is communicated with a plurality of cathode pole liquid inlet diversion trenches, and the anode pole liquid inlet is provided with no diversion trenches. The cathode pole liquid inlet diversion groove enters a flow channel of the flow field through the connecting groove, then is converged into the outlet connecting groove and is connected through the outlet diversion groove; flows to the cathode liquid outlet.
The parallel flow channels forming the continuous parallel flow field are preferably one or two combinations of the following two structures: one structure is a strip-shaped straight flow passage, and the other structure is an arc-shaped or S-shaped flow passage; the floating point type flow field is characterized in that grooves are formed in the surface of a polar plate, bulges with the same height as the depth of the grooves are uniformly distributed at the bottoms of the grooves, and gaps among the bulges in the grooves are used as flow channels of the flow field.
Preferably, the cross section of the parallel flow channels perpendicular to the fluid flowing direction is rectangular, square, semicircular, trapezoidal or other shapes; the floating point flow channel is formed by bulges which are uniformly distributed on the bottom surface of the groove on the surface of the polar plate, and the bulges are rectangular and/or circular.
The invention provides a diversion polar plate with a split structure, wherein a water diversion flow field adopts a metal plate, and the inlet side and the outlet side adopt an insulating plate, so that chlorine gas generated by chlorine ions obtained by seawater at the inlet side and the outlet side can be effectively prevented, and seawater electrolysis and chlorine evolution reaction can be prevented. By optimizing the electrode plate structure used by the seawater acidification electrolytic cell, the electrode plate with uniform and smooth fluid flow is obtained, the chlorine evolution side reaction is avoided in the seawater acidification process, and the hydrogen evolution and oxygen evolution purity is improved.
Drawings
FIG. 1 is a schematic view of the structure of an insulating frame of a flow-guiding bipolar plate;
FIG. 2 is a schematic view of a diversion bipolar plate water diversion flow field plate structure;
FIG. 3 is a schematic view of the front side structure of a flow-guiding bipolar plate;
FIG. 4 is a schematic view of the reverse structure of a flow-directing bipolar plate;
FIG. 5 is a schematic view of a sealing face configuration of a flow directing bipolar plate;
FIG. 6 shows a structure of a seawater acidifying electrolytic cell.
In the figure, a seawater inlet 1, a seawater outlet 1-1, a deionized water inlet 2, a deionized water outlet 2-2, a softened water inlet 3, a softened water outlet 3-3, an inlet diversion trench 4, an outlet diversion trench 4-4, a sealing trench 5, an inlet connecting trench 6, an outlet connecting trench 6-6, a sealing surface 7, a flow field 8 and a sealing platform 9 are arranged.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
This example is a flow directing bipolar plate for an acidified cell.
As shown in fig. 1, the plate with three cavity inlets and outlets of the flow-guiding bipolar plate is a glass fiber plate.
As shown in fig. 2, the water diversion flow field plate of the flow guiding bipolar plate is a metal titanium plate with a front water diversion flow field and a back water diversion flow field. The front and back surfaces of the diversion bipolar plate diversion flow field plate are provided with diversion flow fields 8 with certain flow channel layout (in the present embodiment, the layout of the flow channels takes a parallel flow field as an example, the actual structure is not limited to the parallel flow field), deionized water and softened water are respectively circulated, and the periphery of the flow field 8 is provided with a sealing table top 9.
The water diversion flow field on the front side of the flow guide bipolar plate in fig. 3 is circulating deionized water:
deionized water enters the water diversion flow field through a deionized water inlet 2 (left side of figure 3), sequentially passes through an inlet guide groove 4 (left side of figure 3), flows through an inlet connecting groove 6 (left side of figure 3), is uniformly distributed, sequentially passes through an outlet connecting groove 6-6 (right side of figure 3) and an outlet guide groove 4-4 (right side of figure 3), and then flows out through a deionized water outlet 2-2 (right side of figure 3).
The water diversion flow field on the reverse side of the diversion bipolar plate in fig. 4 is circulating softened water:
softened water flows through an inlet connecting groove 6 (right side in figure 4) to enter a water diversion flow field for uniform distribution through a softened water inlet 3 (right side in figure 4), sequentially passes through an inlet guide groove 4 (right side in figure 4), sequentially flows through an outlet connecting groove 6-6 (left side in figure 4) and an outlet guide groove 4-4 (left side in figure 4), and then flows out through a softened water outlet 3-3 (left side in figure 4).
The sealing platform 9 around the water diversion field plate and the sealing surface 7 with the inlet and outlet plates of three cavities in the figure 5 are sealed by bonding, namely the sealing surface 7 of the laminated plate in the figure 1 and the sealing platform 9 of the metal titanium plate in the figure 2 are formed by sealing combination in figures 3 and 4, so that the deionized water flowing through the front side of the flow guide bipolar plate and the softened water flowing through the back side of the flow guide bipolar plate can be prevented from flowing into liquid, and meanwhile, the front surface and the back surface of the flow guide bipolar plate are provided with sealing grooves 5 in which sealing glue lines are placed for sealing the electrode plate and the front and back parts of the electrode plate and preventing liquid leakage.
Claims (8)
1. The flow guide polar plate structure of the seawater acidification electrolytic cell is characterized in that:
the flow guide polar plate is a bipolar plate;
the flow guide polar plate is formed by combining a flow field plate positioned in the center and an electrode liquid inlet and outlet plate positioned on the peripheral side;
the flow field plate is a double-sided flow field; the flow field has a flow channel; the flow field plate is made of metal;
the electrode liquid inlet and outlet plate is an insulating plate or a plate for insulating the electrode liquid inlet and outlet;
the electrode liquid inlet and outlet plate is provided with three groups of inlet and outlet ports: a seawater inlet, a seawater outlet, an anode electrode liquid inlet, an anode electrode liquid outlet, a cathode electrode liquid inlet and a cathode electrode liquid outlet;
the inlet/outlet of the anode/cathode of the electrode liquid inlet/outlet plate is also provided with a flow guide groove and a connecting groove respectively;
the anode solution sequentially enters a flow channel of the flow field plate through an anode solution inlet, an anode inlet diversion trench and an anode inlet connecting trench and then flows to an anode solution outlet through an anode outlet connecting trench and an anode outlet diversion trench; the cathode electrode liquid sequentially enters a flow channel of the flow field plate through a cathode electrode liquid inlet, a cathode inlet flow guide groove and a cathode inlet connecting groove and then sequentially flows to a cathode electrode liquid outlet through a cathode outlet connecting groove and a cathode outlet flow guide groove;
the anode solution is deionized water; the cathode electrode liquid is softened water for removing metal ions.
2. The flow guide plate structure of the seawater acidification electrolyzer of claim 1, which is characterized in that: the seawater inlet and the seawater outlet, the anode electrode liquid inlet and the anode electrode liquid outlet, and the cathode electrode liquid inlet and the cathode electrode liquid outlet are respectively arranged in point symmetry by taking the center of the electrode liquid inlet and outlet plate as a central point.
3. The flow guide plate structure of the seawater acidification electrolyzer of claim 1, which is characterized in that: the seawater inlet, the anode electrode liquid inlet and the cathode electrode liquid inlet are arranged on the same side or different sides of the electrode liquid inlet and outlet plate.
4. The flow guide plate structure of the seawater acidification electrolyzer of claim 1, which is characterized in that: the diversion trench and the connecting trench are designed into straight flow trenches.
5. The flow guide plate structure of the seawater acidification electrolyzer of claim 1, which is characterized in that: the flow field plate is a metal plate with a coating layer on the surface.
6. The flow guide plate structure of the seawater acidification electrolyzer of claim 5, characterized in that: the metal material is titanium or stainless steel.
7. The flow guide plate structure of the seawater acidification electrolyzer of claim 5, characterized in that: the coating layer is a high-conductivity corrosion-resistant material layer, the material is one or the combination of more than two of Pt, Ru or Ir, and the thickness of the coating layer is 1-5 mu m.
8. The flow guide plate structure of the seawater acidification electrolyzer of claim 1, which is characterized in that: the flow channels of the flow field are parallel flow channels or floating point flow channels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811513704.3A CN111313048B (en) | 2018-12-11 | 2018-12-11 | Seawater acidification electrolytic cell flow guide polar plate structure not easy to separate chlorine |
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| CN201811513704.3A CN111313048B (en) | 2018-12-11 | 2018-12-11 | Seawater acidification electrolytic cell flow guide polar plate structure not easy to separate chlorine |
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| CN111313048B true CN111313048B (en) | 2021-07-27 |
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| CN112285013A (en) * | 2020-09-28 | 2021-01-29 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | On-site rapid spot inspection method for coating quality of metal bipolar plate |
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| CN1151378A (en) * | 1995-12-05 | 1997-06-11 | 徐宝安 | Seawater desalination method and appts. thereof |
| CN102569833A (en) * | 2010-12-17 | 2012-07-11 | 上海空间电源研究所 | Bipolar plate of redox flow battery |
| EP2543427A1 (en) * | 2011-07-06 | 2013-01-09 | Xerox Corporation | Electrodialytic separation of CO2 gas from seawater |
| CN105239090A (en) * | 2010-11-22 | 2016-01-13 | 三菱重工环境·化学工程株式会社 | Seawater electrolysis system and seawater electrolysis method |
| WO2017205044A1 (en) * | 2016-05-26 | 2017-11-30 | X Development Llc | Method for efficient co2 degasification |
| KR20170132454A (en) * | 2016-05-24 | 2017-12-04 | 주식회사 세광마린텍 | Electrolysis of tubular type for water waste and sweage treatment device including thereof |
| WO2018047191A1 (en) * | 2016-09-07 | 2018-03-15 | Krishnamohan Sharma | Carbon dioxide mediated recovery of potassium compounds from brines |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100388085B1 (en) * | 2002-04-16 | 2003-06-27 | Hanwha Chemical Corp | Forming method of gasket used in electrolytic analyzer, gasket and electrolytic analyzer |
| CN101956210A (en) * | 2010-10-08 | 2011-01-26 | 褚礼政 | Electrode plate of electrolytic tank |
| EP2961863B1 (en) * | 2013-02-28 | 2018-01-10 | The Government of the United States of America, as represented by the Secretary of the Navy | Electrochemical module configuration for the continuous acidification of alkaline water sources and recovery of co2 with continuous hydrogen gas production |
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- 2018-12-11 CN CN201811513704.3A patent/CN111313048B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151378A (en) * | 1995-12-05 | 1997-06-11 | 徐宝安 | Seawater desalination method and appts. thereof |
| CN105239090A (en) * | 2010-11-22 | 2016-01-13 | 三菱重工环境·化学工程株式会社 | Seawater electrolysis system and seawater electrolysis method |
| CN102569833A (en) * | 2010-12-17 | 2012-07-11 | 上海空间电源研究所 | Bipolar plate of redox flow battery |
| EP2543427A1 (en) * | 2011-07-06 | 2013-01-09 | Xerox Corporation | Electrodialytic separation of CO2 gas from seawater |
| KR20170132454A (en) * | 2016-05-24 | 2017-12-04 | 주식회사 세광마린텍 | Electrolysis of tubular type for water waste and sweage treatment device including thereof |
| WO2017205044A1 (en) * | 2016-05-26 | 2017-11-30 | X Development Llc | Method for efficient co2 degasification |
| WO2018047191A1 (en) * | 2016-09-07 | 2018-03-15 | Krishnamohan Sharma | Carbon dioxide mediated recovery of potassium compounds from brines |
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