Carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap

Abstract

The utility model discloses a carbon dioxide electrolysis flowing electrolytic cell with low cell pressure and small gaps, which comprises a carbon dioxide electrolysis flowing electrolytic cell with low cell pressure and small gaps. Comprising an anode end plate, a first anode gasket, an anode electrode, a second anode gasket, an anode plate, a first exchange membrane gasket, a proton exchange membrane, a second exchange membrane gasket, a cathode plate, a first cathode gasket, a cathode electrode, a second cathode gasket, a vent plate, an end plate gasket, a reference electrode end plate, a first power connection copper adhesive tape and a second power connection copper adhesive tape, and a plurality of bolts and a plurality of nuts. According to the carbon dioxide electrolysis flowing electrolytic tank with the low cell pressure and the small gap, a compact flowing electrolytic tank structure is adopted, all assemblies are fastened and connected through a plurality of sets of bolts and nuts to form a whole, the size and the weight of the electrolytic tank are reduced, the sealing performance and the stability of the electrolytic tank are improved, the cell pressure and the resistance of the electrolytic tank are reduced, and the service life of the electrolytic tank is prolonged. And the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrochemistry, in particular to a carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap. Background Art

[0002] Carbon dioxide (CO2) is a major greenhouse gas, and its emissions are closely related to global climate change. In order to reduce CO2 emissions, using renewable energy to convert CO2 into valuable chemicals or fuels is an effective method. Electrochemical reduction is a technology that uses electrical energy to drive the CO2 reduction reaction, which can achieve efficient conversion of CO2 and energy storage. At present, a variety of electrocatalysts have been developed that can achieve selective reduction of CO2 to obtain different products such as CO, formic acid, and ethylene. However, CO2 electrochemical reduction faces some challenges, one of which is the low solubility of CO2 in aqueous solution, which leads to limited reaction rate. In order to increase the reaction rate, it is necessary to improve the mass transfer efficiency of CO2, that is, to increase the contact area and time between CO2 and the electrode surface.

[0003] At present, the commonly used types of reactors are H-type electrolytic cells and flow electrolytic cells. The H-type electrolytic cell is a simple reactor consisting of two half-cells connected by a salt bridge. The advantages of the H-type electrolytic cell are its simple structure, easy construction and operation, and its suitability for the screening and evaluation of electrocatalysts. However, the disadvantages of the H-type electrolytic cell are its low reaction rate, which cannot meet the needs of industrialization, and it is difficult to control the reaction conditions, such as temperature, pressure, pH, etc. The flow electrolytic cell is a more advanced reactor that can achieve high-speed CO2 mass transfer and efficient electrochemical reduction.

[0004] The characteristic of the flow electrolysis cell is that it uses a gas diffusion electrode (GDE) as the cathode to transport gaseous CO2 directly to the electrode surface, where it contacts and reacts with the electrolyte. The advantages of the flow electrolysis cell are high reaction rates that can reach the ampere level, and the ability to control reaction conditions such as temperature, pressure, pH, etc. The disadvantages of the flow electrolysis cell are that it has a complex structure and requires more components and equipment, such as pumps, valves, sensors, etc., and that some technical problems need to be solved, such as water management, bubble removal, electrode stability, etc. There are some problems to be solved in the existing CO2 reduction flow cells in laboratories:

[0005] 1. The CO2 reduction flow cells in the laboratory are all made of multiple thick plates. Since there are inlet and outlet holes on both sides of the plates, the plates cannot be too thin, otherwise they cannot accommodate the inlet and outlet holes, that is, there is a minimum gap between the anode and cathode, which is not conducive to experimental research;

[0006] 2. It is not convenient to observe the chemical reaction state during the experiment;

[0007] 3. Bolts are used to fasten components together. This sealing method is not conducive to the long-term maintenance and disassembly of air tightness.

[0008] In view of this, a carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap is designed. Utility Model Content

[0009] The utility model aims to provide a carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap, so as to solve the problems existing in the existing carbon dioxide electrolysis flow electrolysis cell mentioned in the above background technology.

[0010] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap, comprising an anode end plate, a first anode gasket, an anode electrode, a second anode gasket, an anode plate, a first exchange membrane gasket, a proton exchange membrane, a second exchange membrane gasket, a cathode plate, a first cathode gasket, a cathode electrode, a second cathode gasket, a vent plate, an end plate gasket, a reference electrode end plate, a first copper tape for connecting electricity, a second copper tape for connecting electricity, a plurality of groups of bolts and a plurality of groups of nuts;

[0011] The anode end plate, the first anode gasket, the anode electrode, the second anode gasket, the anode plate, the first exchange membrane gasket, the proton exchange membrane, the second exchange membrane gasket, the cathode plate, the first cathode gasket, the cathode electrode, the second cathode gasket, the ventilation plate, the end plate gasket, and the reference electrode end plate are connected in sequence;

[0012] The first electrical copper tape is connected between the first anode gasket and the second anode gasket;

[0013] The second electrical copper tape is connected between the first cathode gasket and the second cathode gasket;

[0014] An anode liquid inlet is provided in the front lower end of the anode end plate, and an anode liquid discharge port is provided in the rear upper end of the anode end plate;

[0015] A gas inlet and a cathode liquid inlet are sequentially provided in the front upper end of the reference electrode end plate from top to bottom, a cathode liquid discharge port and a gas discharge port are sequentially provided in the rear lower end of the reference electrode end plate from top to bottom, a reference electrode socket is provided in the top of the reference electrode end plate, the reference electrode socket is connected to the cathode liquid discharge port, and a reference electrode is connected in the reference electrode socket;

[0016] The anode liquid inlet, anode liquid discharge port, gas inlet, cathode liquid inlet, cathode liquid discharge port, gas discharge port, and reference electrode jack are all connected with hollow bolts through threaded structures, and a connecting pipe is inserted and connected inside the hollow bolts;

[0017] Anode flow holes are provided in the upper and lower ends of the first anode gasket, the second anode gasket and the anode plate;

[0018] Two groups of cathode flow holes are provided in the middle of the cathode plate, the first cathode gasket, the second cathode gasket, the vent plate, and the end plate gasket;

[0019] The upper and lower ends of the ventilation plate and the end plate gasket are both provided with gas flow holes;

[0020] The first anode gasket, the second anode gasket, the first exchange membrane gasket, the second exchange membrane gasket, the first cathode gasket, the second cathode gasket, and the end plate gasket all have flow channel windows extending through the middle thereof;

[0021] The anode plate and the ventilation plate are both provided with a first flow channel in the middle thereof;

[0022] A second flow channel is provided through the middle of the cathode plate;

[0023] Several groups of the bolts and several groups of the nuts are suitable for installing and fastening the anode end plate, the first anode gasket, the anode electrode, the second anode gasket, the anode plate, the first exchange membrane gasket, the proton exchange membrane, the second exchange membrane gasket, the cathode plate, the first cathode gasket, the cathode electrode, the second cathode gasket, the ventilation plate, the end plate gasket, and the reference electrode end plate.

[0024] Preferably, the anode liquid inlet, anode liquid discharge port, gas inlet, cathode liquid inlet, cathode liquid discharge port, and gas discharge port are all "L"-shaped structures.

[0025] Preferably, the anode end plate, the first anode gasket, the second anode gasket, the anode plate, the first exchange membrane gasket, the second exchange membrane gasket, the cathode plate, the first cathode gasket, the second cathode gasket, the ventilation plate, the end plate gasket, and the reference electrode end plate are all provided with a plurality of groups of mounting holes, a plurality of groups of bolts are connected through the plurality of mounting holes with clearance fit, and a plurality of groups of nuts are connected to the plurality of bolts through a threaded structure.

[0026] Preferably, the first flow channel is a multi-section meandering structure.

[0027] Preferably, a plurality of groups of gaskets are connected between the anode end plate and the first anode gasket, and between the end plate gasket and the reference electrode end plate.

[0028] Preferably, the thickness of the anode plate, cathode plate and ventilation plate are all 1 mm.

[0029] Compared with the prior art, the beneficial effects of the utility model are:

[0030] 1. The carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap adopts a compact flow electrolytic cell structure, and each component is fastened and connected by a plurality of sets of bolts and nuts to form a whole, thereby reducing the volume and weight of the electrolytic cell, improving the sealing and stability of the electrolytic cell, reducing the cell pressure and resistance of the electrolytic cell, and saving energy consumption;

[0031] 2. The anode-cathode gap of the carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap can be achieved by replacing plates of different thicknesses, which has the advantage of controllable anode-cathode spacing, and the minimum gap is much lower than that of the existing electrolytic cells;

[0032] 3. The end plate of the carbon dioxide electrolysis flow electrolytic cell with low tank pressure and small gap is made of acrylic, which is convenient for observing the chemical reaction state;

[0033] 4. The carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap prevents leakage of electrolyte and gas by setting gaskets at the connecting end plates and using gaskets to seal in the middle, thereby further improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the assembly structure of the carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap of the utility model;

[0035] Figure 2 It is an exploded view of the carbon dioxide electrolysis flow electrolytic cell with low tank pressure and small gap of the utility model;

[0036] Figure 3 A schematic diagram of the structure of the anode terminal plate of the carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap of the utility model;

[0037] Figure 4 Another structural schematic diagram of the anode end plate of the carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap of the utility model;

[0038] Figure 5 It is a schematic diagram of the structure after hollow bolts and washers are installed on the anode end plate of the carbon dioxide electrolysis flow electrolysis cell with low tank pressure and small gap of the utility model;

[0039] Figure 6 This is a schematic diagram of the structure of the first anode gasket of the carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap of the utility model;

[0040] Figure 7 It is a schematic diagram of the anode plate structure of the carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap of the utility model;

[0041] Figure 8It is a schematic diagram of the cathode plate structure of the carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap of the utility model;

[0042] Fig. 9 This is a schematic diagram of the structure of the first cathode gasket of the carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap of the utility model;

[0043] Fig.10 It is a schematic diagram of the structure of the end plate gasket of the carbon dioxide electrolysis flow electrolytic cell with low tank pressure and small gap of the utility model;

[0044] Fig.11 It is a schematic diagram of the structure of the ventilation plate of the carbon dioxide electrolysis flow electrolysis cell with low tank pressure and small gap of the utility model;

[0045] Fig.12 A schematic diagram of the structure of a reference electrode end plate of a carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap of the utility model;

[0046] Fig.13 Another structural schematic diagram of the reference electrode end plate of the carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap of the utility model;

[0047] Fig.14 It is a schematic diagram of the structure after the reference electrode end plate of the carbon dioxide electrolysis flow electrolysis cell with low tank pressure and small gap of the utility model is installed with hollow bolts and washers;

[0048] Fig.15 It is a schematic diagram of the anode electrolyte flow channel of the carbon dioxide electrolysis flow electrolytic cell with low cell pressure and small gap of the utility model;

[0049] Fig.16 It is a schematic diagram of the carbon dioxide gas flow channel of the carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap of the utility model;

[0050] Fig.17 The utility model is a schematic diagram of the cathode electrolyte flow channel of the carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap.

[0051] In the figure:

[0052] 1. Anode end plate; 2. First anode gasket; 3. Anode electrode; 4. Second anode gasket;

[0053] 5. Anode plate; 6. First exchange membrane gasket; 7. Proton exchange membrane; 8. Second exchange membrane gasket;

[0054] 9. cathode plate; 10. first cathode gasket; 11. cathode electrode; 12. second cathode gasket;

[0055] 13. Ventilation plate; 14. End plate gasket; 15. Reference electrode end plate; 16. First electrical connection copper tape;

[0056] 17. Second electrical copper tape; 18. Anode liquid inlet; 19. Anode liquid outlet;

[0057] 20. Gas inlet; 21. Cathode liquid inlet; 22. Cathode liquid outlet; 23. Gas outlet;

[0058] 24. Reference electrode jack; 25. Hollow bolt; 26. Connecting pipe; 27. Anode flow hole;

[0059] 28. cathode flow hole; 29. ​​gas flow hole; 30. flow channel window; 31. first flow channel;

[0060] 32. Bolt; 33. Nut; 34. Mounting hole; 35. Second flow channel; 36. Washer;

[0061] 37. Reference electrode. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0063] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0064] In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0065] See also Figure 1-17 The utility model provides a technical solution: a carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap, including an anode terminal plate 1, a first anode gasket 2, an anode electrode 3, a second anode gasket 4, an anode plate 5, a first exchange membrane gasket 6, a proton exchange membrane 7, a second exchange membrane gasket 8, a cathode plate 9, a first cathode gasket 10, a cathode electrode 11, a second cathode gasket 12, a ventilation plate 13, an end plate gasket 14, a reference electrode terminal plate 15, a first copper tape for connecting electricity 16, a second copper tape for connecting electricity 17, a plurality of groups of bolts 32 and a plurality of groups of nuts 33.

[0066] Anode end plate 1, first anode gasket 2, anode electrode 3, second anode gasket 4, anode plate 5, first exchange membrane gasket 6, proton exchange membrane 7, second exchange membrane gasket 8, cathode plate 9, first cathode gasket 10, cathode electrode 11, second cathode gasket 12, ventilation plate 13, end plate gasket 14, reference electrode end plate 15 are connected in sequence.

[0067] Specifically, the anode end plate 1 and the reference electrode end plate 15 are made of acrylic material, which is convenient for observing the chemical reaction state of the electrolytic cell.

[0068] The first electrical copper tape 16 is connected between the first anode gasket 2 and the second anode gasket 4 .

[0069] The second electrical copper tape 17 is connected between the first cathode gasket 10 and the second cathode gasket 12 .

[0070] Specifically, according to actual use requirements, the power connection can be made using traditional copper tape or power connection sheets. During the electrochemical reaction, the copper tape is easy to participate in the electrochemical reaction, while the power connection sheet is made of titanium or stamped stainless steel and is not easy to participate in the electrochemical reaction.

[0071] Specifically, the first anode gasket 2, the second anode gasket 4, the first exchange membrane gasket 6, the second exchange membrane gasket 8, the first cathode gasket 10, the second cathode gasket 12, and the end plate gasket 14 can be sealed with Teflon gaskets or fluororubber gaskets, and the sealing effect is excellent.

[0072] An anode liquid inlet 18 is provided in the front lower end of the anode end plate 1 , and an anode liquid discharge port 19 is provided in the rear upper end of the anode end plate 1 .

[0073] A gas inlet 20 and a cathode liquid inlet 21 are sequentially provided in the upper front end of the reference electrode end plate 15 from top to bottom, a cathode liquid discharge port 22 and a gas discharge port 23 are sequentially provided in the lower rear end of the reference electrode end plate 15 from top to bottom, a reference electrode plug hole 24 is provided in the top of the reference electrode end plate 15, the reference electrode plug hole 24 is connected to the cathode liquid discharge port 22, and a reference electrode 37 is connected in the reference electrode plug hole 24. Specifically, the reference electrode 37 can be inserted into the electrolytic cell through the reference electrode plug hole 24 and the hollow bolt 25 to achieve accurate control of the cathode potential, optimize the reaction conditions, improve the selectivity and energy efficiency of the reaction, and also facilitate monitoring and evaluation of the performance of the electrolytic cell.

[0074] The anode liquid inlet 18, the anode liquid discharge port 19, the gas inlet 20, the cathode liquid inlet 21, the cathode liquid discharge port 22, and the gas discharge port 23 are all "L"-shaped structures. Specifically, an "L"-shaped liquid inlet and outlet and gas port are adopted, so that the flow direction of the electrolyte and the gas is perpendicular to the plane where the electrode is located, increasing the contact area and time between the electrolyte and the gas and the electrode surface, improving the mass transfer efficiency and reaction rate of the carbon dioxide gas, and also facilitating the removal of bubbles, preventing the bubble coverage phenomenon on the electrode surface.

[0075] Several sets of gaskets 36 are connected between the anode end plate 1 and the first anode gasket 2, and between the end plate gasket 14 and the reference electrode end plate 15. Figure 3-5 And the instruction manual Figure 12-14 Two groups of gaskets 36 are connected to the anode end plate 1, and four groups of gaskets 36 are connected to the reference electrode end plate 15. Inner grooves for connecting the gaskets 36 are provided in the sides of the anode end plate 1 close to the reference electrode end plate 15, that is, inner grooves for connecting the gaskets 36 are provided at the outlet of the anode liquid inlet 18, the inlet of the anode liquid discharge port 19, the outlet of the gas inlet 20, the outlet of the cathode liquid inlet 21, the inlet of the cathode liquid discharge port 22, and the inlet of the gas discharge port 23. The gaskets 36 adopt an "O"-shaped structure. Through the setting of the gaskets 36, they can be connected between the anode end plate 1 and the first anode gasket 2, and between the end plate gasket 14 and the reference electrode end plate 15, playing a role of buffering and sealing, preventing leakage of electrolyte and gas, and protecting the safety and reliability of the electrolytic cell.

[0076] The anode liquid inlet 18 , the anode liquid discharge port 19 , the gas inlet 20 , the cathode liquid inlet 21 , the cathode liquid discharge port 22 , the gas discharge port 23 , and the reference electrode jack 24 are all connected with hollow bolts 25 through threaded structures, and a connecting pipe 26 is inserted and connected inside the hollow bolts 25 .

[0077] Specifically, the outer surface of the hollow bolt 25 is provided with threads, which facilitates the installation and removal of the hollow bolt 25 in the anode liquid inlet 18, the anode liquid discharge port 19, the gas inlet 20, the cathode liquid inlet 21, the cathode liquid discharge port 22, the gas discharge port 23, and the reference electrode jack 24. The connecting tube 26 can be used for the input and output of external electrolyte and external gas. The connecting tube 26 is movably inserted and connected in the hollow bolt 25, and a sealing rubber ring can be used to achieve tightening and sealing between the surface of the connecting tube 26 and the hollow bolt 25.

[0078] Anode flow holes 27 are formed in the upper and lower ends of the first anode gasket 2 , the second anode gasket 4 , and the anode plate 5 .

[0079] Two groups of cathode flow holes 28 are provided in the middle of the cathode plate 9 , the first cathode gasket 10 , the second cathode gasket 12 , the ventilation plate 13 , and the end plate gasket 14 .

[0080] Gas flow holes 29 are formed in the upper and lower ends of the ventilation plate 13 and the end plate gasket 14 .

[0081] A flow channel window 30 is provided through the middle of the first anode gasket 2 , the second anode gasket 4 , the first exchange membrane gasket 6 , the second exchange membrane gasket 8 , the first cathode gasket 10 , the second cathode gasket 12 , and the end plate gasket 14 .

[0082] A first flow channel 31 is provided through the middle of the anode plate 5 and the ventilation plate 13 .

[0083] The first flow channel 31 is a multi-stage meandering structure. Figure 7 And the instruction manual Fig.11 The first flow channel 31 is set to a multi-stage zigzag structure, so that when the electrolyte flows between the anode plate 5 and the ventilation plate 13, it can fully contact the anode electrode 3 and the cathode electrode 11, thereby increasing the utilization rate of the electrolyte and also increasing the flow resistance of the electrolyte, which is beneficial to maintaining the stability of the gas-liquid-solid three-phase interface on the surface of the gas diffusion electrode (GDE) and preventing the occurrence of water flooding.

[0084] A second flow channel 35 is provided in the middle of the cathode plate 9. Specifically, the second flow channel 35 increases the surface area of ​​the cathode electrode 11, improves the conversion rate and reaction rate of carbon dioxide gas, and is also conducive to the removal of gas products, preventing the bubble coverage of the electrode surface.

[0085] Several groups of bolts 32 and several groups of nuts 33 are suitable for installing and fastening the anode end plate 1, the first anode gasket 2, the anode electrode 3, the second anode gasket 4, the anode plate 5, the first exchange membrane gasket 6, the proton exchange membrane 7, the second exchange membrane gasket 8, the cathode plate 9, the first cathode gasket 10, the cathode electrode 11, the second cathode gasket 12, the ventilation plate 13, the end plate gasket 14, and the reference electrode end plate 15.

[0086] Anode end plate 1, first anode gasket 2, second anode gasket 4, anode plate 5, first exchange membrane gasket 6, second exchange membrane gasket 8, cathode plate 9, first cathode gasket 10, second cathode gasket 12, ventilation plate 13, end plate gasket 14, reference electrode end plate 15 are all provided with a plurality of groups of mounting holes 34, a plurality of groups of bolts 32 are connected through the plurality of groups of mounting holes 34 with clearance fit, and a plurality of groups of nuts 33 are connected to the plurality of groups of bolts 32 through threaded structures. Specifically, each component is fastened and connected by a plurality of groups of bolts 32 and nuts 33 to form a whole, thereby reducing the volume and weight of the electrolytic cell, improving the sealing and stability of the electrolytic cell, reducing the cell pressure and resistance of the electrolytic cell, and saving energy consumption.

[0087] The thickness of the anode plate 5, cathode plate 9, and ventilation plate 13 are all 1 mm. Specifically, the electrolytic cell can achieve the anode-cathode distance by replacing the anode plates 5, cathode plates 9, and ventilation plates 13 of different thicknesses, and has the advantage of adjustable gap, and the minimum gap is much lower than the existing electrolytic cells, that is, the minimum gap is the minimum thickness of the plate, and theoretically, the minimum anode-cathode distance of 2 mm can be achieved.

[0088] For details, please refer to the attached manual. Fig.15 , which is a schematic diagram of the flow path of the anode electrolyte. The anode electrolyte flows in from the anode liquid inlet 18 of the anode end plate 1, and first passes through the anode flow hole 27 in the lower end of the first anode gasket 2 and the anode flow hole 27 in the lower end of the second anode gasket 4 to the right. Since the first anode gasket 2 and the second anode gasket 4 are compressed, the liquid will directly pass through the two layers of anode gaskets and reach the anode flow hole 27 in the lower end of the anode plate 5. Then the electrolyte solution will go up along the first flow channel 31 on the anode plate 5 and reach the anode flow hole 27 in the upper end of the anode plate 5. In this process, the electrolyte in the first flow channel 31 also flows into the flow channel window 30 in the middle of the first exchange membrane gasket 6. Finally, the electrolyte solution flows out of the electrolytic cell from the anode flow hole 27 in the upper end of the second anode gasket 4, the anode flow hole 27 in the upper end of the first anode gasket 2, and the anode drain port 19 in sequence.

[0089] For details, please refer to the attached manual. Fig.16, which is a schematic diagram of the flow path of carbon dioxide gas. Carbon dioxide gas is input from the gas inlet 20, passes through the gas flow holes 29 in the upper end of the end plate gasket 14 and the gas flow holes 29 in the upper end of the vent plate 13 in sequence, and then the gas enters the first flow channel 31 in the vent plate 13, and the first flow channel 31 in the vent plate 13 is connected to each flow channel window 30 on the cathode side of the electrolytic cell. The carbon dioxide gas is output from the gas flow holes 29 in the lower end of the vent plate 13 and the gas flow holes 29 in the lower end of the end plate gasket 14 to the gas outlet 23 and discharged from the electrolytic cell.

[0090] For details, please refer to the attached manual. Fig.17 , which is a schematic diagram of the flow path of the cathode electrolyte. The cathode electrolyte flows in from the cathode liquid inlet 21, passes through the cathode flow hole 28 in the middle upper side of the end plate gasket 14, the cathode flow hole 28 in the middle upper side of the ventilation plate 13, the cathode flow hole 28 in the middle upper side of the second cathode gasket 12, the cathode flow hole 28 in the middle upper side of the first cathode gasket 10, and the cathode flow hole 28 in the middle upper side of the cathode plate 9, and then flows downward into the second flow channel 35 in the middle of the cathode plate 9. In this process, During the process, the cathode electrolyte also enters the flow channel window 30 of the second exchange membrane gasket 8, and then the cathode electrolyte turns back to the right and is successively input into the cathode flow hole 28 in the lower middle side of the cathode plate 9, the cathode flow hole 28 in the lower middle side of the first cathode gasket 10, the cathode flow hole 28 in the lower middle side of the second cathode gasket 12, the cathode flow hole 28 in the lower middle side of the ventilation plate 13, and the cathode flow hole 28 in the lower middle side of the end plate gasket 14, and finally discharged from the electrolytic cell through the cathode drain port 22.

[0091] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flow electrolytic cell for carbon dioxide electrolysis with low cell pressure and small gap, characterized in that: It comprises an anode end plate (1), a first anode gasket (2), an anode electrode (3), a second anode gasket (4), an anode plate (5), a first exchange membrane gasket (6), a proton exchange membrane (7), a second exchange membrane gasket (8), a cathode plate (9), a first cathode gasket (10), a cathode electrode (11), a second cathode gasket (12), a vent plate (13), an end plate gasket (14), a reference electrode end plate (15), a first electrical copper tape (16), a second electrical copper tape (17), a plurality of groups of bolts (32) and a plurality of groups of nuts (33); The anode end plate (1), the first anode gasket (2), the anode electrode (3), the second anode gasket (4), the anode plate (5), the first exchange membrane gasket (6), the proton exchange membrane (7), the second exchange membrane gasket (8), the cathode plate (9), the first cathode gasket (10), the cathode electrode (11), the second cathode gasket (12), the ventilation plate (13), the end plate gasket (14), and the reference electrode end plate (15) are connected in sequence; The first electrical copper tape (16) is connected between the first anode gasket (2) and the second anode gasket (4); The second electrical copper tape (17) is connected between the first cathode gasket (10) and the second cathode gasket (12); An anode liquid inlet (18) is provided in the front lower end of the anode end plate (1), and an anode liquid discharge port (19) is provided in the rear upper end of the anode end plate (1); A gas inlet (20) and a cathode liquid inlet (21) are sequentially provided in the front upper end of the reference electrode end plate (15) from top to bottom, a cathode liquid discharge port (22) and a gas discharge port (23) are sequentially provided in the rear lower end of the reference electrode end plate (15) from top to bottom, a reference electrode plug hole (24) is provided in the top of the reference electrode end plate (15), the reference electrode plug hole (24) is connected to the cathode liquid discharge port (22), and a reference electrode (37) is connected in the reference electrode plug hole (24); The anode liquid inlet (18), the anode liquid discharge port (19), the gas inlet (20), the cathode liquid inlet (21), the cathode liquid discharge port (22), the gas discharge port (23), and the reference electrode jack (24) are all connected with a hollow bolt (25) via a threaded structure, and a connecting pipe (26) is inserted and connected inside the hollow bolt (25); Anode flow holes (27) are provided in the upper ends and lower ends of the first anode gasket (2), the second anode gasket (4) and the anode plate (5); Two groups of cathode flow holes (28) are provided in the middle of the cathode plate (9), the first cathode gasket (10), the second cathode gasket (12), the ventilation plate (13), and the end plate gasket (14); The upper end and the lower end of the ventilation plate (13) and the end plate gasket (14) are both provided with gas flow holes (29); A flow channel window (30) is provided in the middle of each of the first anode gasket (2), the second anode gasket (4), the first exchange membrane gasket (6), the second exchange membrane gasket (8), the first cathode gasket (10), the second cathode gasket (12), and the end plate gasket (14); A first flow channel (31) is provided in the middle of the anode plate (5) and the ventilation plate (13); A second flow channel (35) is provided through the middle of the cathode plate (9); A plurality of groups of bolts (32) and a plurality of groups of nuts (33) are suitable for installing and fastening the anode end plate (1), the first anode gasket (2), the anode electrode (3), the second anode gasket (4), the anode plate (5), the first exchange membrane gasket (6), the proton exchange membrane (7), the second exchange membrane gasket (8), the cathode plate (9), the first cathode gasket (10), the cathode electrode (11), the second cathode gasket (12), the ventilation plate (13), the end plate gasket (14), and the reference electrode end plate (15).

2. The carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap according to claim 1, characterized in that: The anode liquid inlet (18), the anode liquid discharge port (19), the gas inlet (20), the cathode liquid inlet (21), the cathode liquid discharge port (22), and the gas discharge port (23) are all "L"-shaped structures.

3. The carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap according to claim 1, characterized in that: The anode end plate (1), the first anode gasket (2), the second anode gasket (4), the anode plate (5), the first exchange membrane gasket (6), the second exchange membrane gasket (8), the cathode plate (9), the first cathode gasket (10), the second cathode gasket (12), the ventilation plate (13), the end plate gasket (14), and the reference electrode end plate (15) are all provided with a plurality of groups of mounting holes (34); a plurality of groups of bolts (32) are loosely fitted and inserted into the plurality of groups of mounting holes (34); and a plurality of groups of nuts (33) are connected to the plurality of groups of bolts (32) via a threaded structure.

4. The carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap according to claim 1, characterized in that: The first flow channel (31) is a multi-stage meandering structure.

5. The carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap according to claim 1, characterized in that: A plurality of groups of gaskets (36) are connected between the anode end plate (1) and the first anode gasket (2), and between the end plate gasket (14) and the reference electrode end plate (15).

6. The carbon dioxide electrolysis flow electrolysis cell with low cell pressure and small gap according to claim 1, characterized in that: The thickness of the anode plate (5), cathode plate (9) and ventilation plate (13) are all 1 mm.

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