Electrolyzer and electrochemical mediated amine regenerated carbon capture device

Abstract

The invention provides an electrolyzer and an electrochemical mediation amine regeneration carbon capture device. The electrolyzer comprises a first electrode plate and a second electrode plate, wherein each of the first electrode plate and the second electrode plate is provided with a porous region which is arranged in a penetrating manner; the first end plate is arranged on the side, away from the anion exchange membrane, of the first electrode plate, the first end plate is provided with a first electrolytic cell, the first electrolytic cell corresponds to the porous area, and the first end plate is provided with a first power connection part; the second end plate is arranged on the side, away from the anion exchange membrane, of the second electrode plate and connected with the first end plate, the second end plate is provided with a second electrolytic cell, the second electrolytic cell corresponds to the porous area, and the second end plate is provided with a second power connection part; the first outlet is communicated with a separation inlet of the gas-liquid separation tank, and a liquid outlet of the gas-liquid separation tank is communicated with the second inlet. According to the technical scheme provided by the invention, the problems of low efficiency and high energy consumption of carbon dioxide desorption by using an electrochemical mediation amine regeneration method in related technologies can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon capture, and in particular to an electrolyzer and an electrochemically mediated amine regeneration carbon capture device. Background Art

[0002] In recent years, the concentration of carbon dioxide in the atmosphere has risen sharply, reaching 415ppm in May 2019, the highest level in the past 800,000 years. As the greenhouse effect is increasingly intensified, countries around the world are promoting the development of various methods to capture carbon dioxide to effectively mitigate emissions, especially for large-scale point sources from post-combustion flue gas emissions.

[0003] In the related art, electrochemically mediated amine regeneration carbon dioxide capture technology is a new type of carbon dioxide capture technology. Its working process can be divided into carbon dioxide absorption part and carbon dioxide desorption part. Among them, the carbon dioxide absorption part is the same as the traditional carbon dioxide absorption operation. At a lower temperature, the flue gas and the absorption liquid are countercurrently contacted in the absorption tower. The flue gas after the carbon dioxide is absorbed is discharged from the top of the absorption tower. The absorption liquid after absorbing carbon dioxide becomes a carbon dioxide rich liquid and enters the carbon dioxide desorption process. In the carbon dioxide desorption process, the electrochemically mediated amine regeneration method is used to utilize the change in the nucleophilic force between metal ions and adsorbents to form a competitive relationship with carbon dioxide, thereby indirectly realizing the capture and release of carbon dioxide.

[0004] However, the related art method of using electrochemically mediated amine regeneration to desorb carbon dioxide has the problems of low efficiency and high energy consumption. Summary of the invention

[0005] The present invention provides an electrolyzer and an electrochemically mediated amine regeneration carbon capture device to solve the problems of low efficiency and high energy consumption in the related art of carbon dioxide desorption using an electrochemically mediated amine regeneration method.

[0006] According to one aspect of the present invention, an electrolyzer is provided, the electrolyzer comprising: an anion exchange membrane; a first electrode plate and a second electrode plate, respectively arranged on both sides of the anion exchange membrane, the first electrode plate and the second electrode plate both having a porous area arranged therethrough; a first end plate, arranged on a side of the first electrode plate away from the anion exchange membrane, a first electrolytic cell is arranged on a side of the first end plate facing the first electrode plate, the first electrolytic cell corresponds to the porous area, the first end plate also has a first inlet and a first outlet connected to the first electrolytic cell, and the first end plate has a first power connection portion , the first power connection part is connected to the first electrolytic cell; the second end plate is arranged on the side of the second electrode plate away from the anion exchange membrane and connected to the first end plate, the second end plate is provided with a second electrolytic cell on the side facing the second electrode plate, the second electrolytic cell corresponds to the porous area, the second end plate also has a second inlet and a second outlet connected to the second electrolytic cell, the second end plate has a second power connection part, and the second power connection part is connected to the second electrolytic cell; the gas-liquid separation tank, the first outlet is connected to the separation inlet of the gas-liquid separation tank, and the liquid outlet of the gas-liquid separation tank is connected to the second inlet.

[0007] Furthermore, the first electrode plate and the second electrode plate both adopt an integral porous structure, and the electrolyzer also includes: a first sealing ring, which is arranged on the outside of the first electrode plate, and the first sealing ring seals the gap between the first end plate and the anion exchange membrane; a second sealing ring, which is arranged on the outside of the second electrode plate, and the second sealing ring seals the gap between the second end plate and the anion exchange membrane.

[0008] Further, the first end plate includes a first conductive plate and a first insulating end plate, the first electrolytic cell is arranged on the side of the first conductive plate facing the first electrode plate, the first inlet, the first outlet and the first power connection part are all arranged on the first conductive plate, and the first insulating end plate is arranged on the side of the first conductive plate away from the first electrode plate; the second end plate includes a second conductive plate and a second insulating end plate, the second electrolytic cell is arranged on the side of the second conductive plate facing the second electrode plate, the second inlet, the second outlet and the second power connection part are all arranged on the second conductive plate, and the second insulating end plate is arranged on the side of the second conductive plate away from the second electrode plate; the first insulating end plate is connected to the second insulating end plate.

[0009] Furthermore, the first inlet and the first outlet are both arranged on the side of the first conductive plate away from the first electrode plate, the first insulating end plate is provided with a first electrolysis inlet connected to the first inlet, and the first insulating end plate is also provided with a first electrolysis outlet connected to the first outlet; the second inlet and the second outlet are both arranged on the side of the second conductive plate away from the second electrode plate, the second insulating end plate is provided with a second electrolysis inlet connected to the second inlet, and the second insulating end plate is also provided with a second electrolysis outlet connected to the second outlet.

[0010] Furthermore, the first power connection part includes a first power connection lug arranged on the first conductive plate and extending outwards, and a first power connection hole is arranged on the first power connection lug; the second power connection part includes a second power connection lug arranged on the second conductive plate and extending outwards, and a second power connection hole is arranged on the second power connection lug.

[0011] Furthermore, the first electrolytic cell adopts a first serpentine flow channel, and the first inlet and the first outlet are respectively arranged corresponding to the two ends of the first serpentine flow channel; the second electrolytic cell adopts a second serpentine flow channel, and the second inlet and the second outlet are respectively arranged corresponding to the two ends of the second serpentine flow channel.

[0012] Further, the first serpentine flow channel and the second serpentine flow channel are symmetrical with respect to the vertical axis of the anion exchange membrane, the first inlet is located below the first outlet, the second inlet is located below the second outlet, the projection of the first inlet on the anion exchange membrane and the projection of the second inlet on the anion exchange membrane are staggered left and right, and the projection of the first outlet on the anion exchange membrane and the projection of the second outlet on the anion exchange membrane are staggered left and right; and / or, the groove width of the serpentine flow channel is between 1.4mm and 1.6mm, the groove depth of the serpentine flow channel is between 0.9mm and 1.1mm, the interval of the serpentine flow channel is between 0.4mm and 0.6mm, the groove width of the second serpentine flow channel is between 1.4mm and 1.6mm, the groove depth of the second serpentine flow channel is between 0.9mm and 1.1mm, and the interval of the second serpentine flow channel is between 0.4mm and 0.6mm.

[0013] Furthermore, the porosity of the first electrode plate and the porosity of the second electrode plate are both between 50% and 80%; the thickness of the first electrode plate and the thickness of the second electrode plate are both between 1 mm and 10 mm.

[0014] Furthermore, the first electrode plate and the second electrode plate are both made of metal copper; the first sealing ring and the second sealing ring are both made of polytetrafluoroethylene material.

[0015] Furthermore, the first end plate and the second end plate have the same structure, and the first end plate and the second end plate are symmetrically arranged relative to the anion exchange membrane; the first electrode plate and the second electrode plate have the same structure, and the first electrode plate and the second electrode plate are symmetrically arranged relative to the anion exchange membrane; the electrolyzer also includes a carbon dioxide collection tank, and the gas outlet of the gas-liquid separation tank is connected to the inlet of the carbon dioxide collection tank; the first end plate and the second end plate are detachably connected.

[0016] According to another aspect of the present invention, an electrochemically mediated amine regeneration carbon capture device is provided, and the electrochemically mediated amine regeneration carbon capture device comprises the electrolyzer provided above.

[0017] By applying the technical solution of the present invention, the electrolyzer includes an anion exchange membrane, a first electrode plate, a second electrode plate, a first end plate, a second end plate and a gas-liquid separation tank, the first end plate and the second end plate are connected to clamp the first electrode plate, the second electrode plate and the anion exchange membrane, and a porous area is set on the first electrode plate and the second electrode plate. Since the porous area has a three-dimensional porous structure, the electrolyte can evenly penetrate the porous areas of the first electrode plate and the second electrode plate, so that the first electrode plate and the second electrode plate can not only serve as reaction electrodes, but also act as a diffusion layer of the electrolyte, so that the first electrode plate and the second electrode plate can be placed closer, thereby reducing the electrode spacing between the first electrode plate and the second electrode plate, reducing the electrolysis resistance, and helping to reduce the voltage required for the electrolysis process, reduce energy consumption, and improve overall efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic structural diagram of an electrolyzer provided in an embodiment of the present invention is shown;

[0020] Figure 2 A schematic diagram of external connections of an electrolyzer provided in an embodiment of the present invention is shown;

[0021] Figure 3 A schematic structural diagram of a first end plate provided according to an embodiment of the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Anion exchange membrane;

[0024] 20. A first electrode plate;

[0025] 30. A second electrode plate;

[0026] 40. first end plate; 41. first electrolytic cell; 411. first serpentine flow channel; 42. first inlet; 43. first outlet; 44. first power connection portion; 45. first conductive plate; 46. first insulating end plate; 461. first electrolysis inlet; 462. first electrolysis outlet;

[0027] 50, second end plate; 52, second power connection portion; 53, second conductive plate; 54, second insulating end plate; 541, second electrolysis inlet; 542, second electrolysis outlet;

[0028] 60. gas-liquid separation tank; 70. first sealing ring; 80. second sealing ring;

[0029] X, left and right direction. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The applicant has found that the method of electrochemically mediated amine regeneration for carbon dioxide desorption in the related art has the problems of low efficiency and high energy consumption. On this basis, the applicant has conducted research and found that the specific reasons for the above problems are as follows:

[0032] (1) In the electrolyzer design of the related art, in order to facilitate gas collection and electrolyte distribution, a certain distance is usually designed between the positive electrode plate and the negative electrode plate. However, an excessively large electrode distance will cause the ion migration path in the electrolyte to become longer, increase the resistance during the electrolysis process, and further increase energy consumption;

[0033] (2) In the related art, the positive electrode plate and the negative electrode plate adopt traditional smooth electrodes. Since the surface area of ​​the smooth electrode is limited and the active specific surface area of ​​the electrode directly affects the efficiency of the electrolysis reaction, the number of active sites that can participate in the reaction of the positive electrode plate and the negative electrode plate in the related art is small, which limits the electrolysis reaction rate and the capture efficiency of carbon dioxide;

[0034] (3) In the related art, the flow channel design of the electrolyzer is usually relatively simple, aiming to ensure that the electrolyte can flow through the electrode surface and thus participate in the electrochemical reaction. However, the flow channel design in the related art ignores the uniform distribution of the electrolyte on the electrode and the mass transfer efficiency. In particular, the distribution of the electrolyte in the edge area of ​​the electrode is often uneven, resulting in inconsistent reaction activity on the electrode surface, reducing the mass transfer efficiency, reaction rate and capture efficiency, resulting in insufficient utilization of the active area of ​​the electrode, and forming a reaction "dead zone".

[0035] like Figures 1 to 3As shown, an embodiment of the present invention provides an electrolyzer, which includes an anion exchange membrane 10, a first electrode plate 20, a second electrode plate 30, a first end plate 40, a second end plate 50 and a gas-liquid separation tank 60, wherein the first electrode plate 20 and the second electrode plate 30 are respectively arranged on both sides of the anion exchange membrane 10, and the first electrode plate 20 and the second electrode plate 30 both have a porous area arranged therethrough, the first end plate 40 is arranged on a side of the first electrode plate 20 away from the anion exchange membrane 10, and a first electrolytic cell 41 is arranged on a side of the first end plate 40 facing the first electrode plate 20, the first electrolytic cell 41 corresponds to the porous area, and the first end plate 40 also has a first inlet 40 connected to the first electrolytic cell 41. 2 and a first outlet 43, the first end plate 40 has a first power connection portion 44, the first power connection portion 44 is connected to the first electrolytic cell 41, the second end plate 50 is arranged on the side of the second electrode plate 30 away from the anion exchange membrane 10 and connected to the first end plate 40, the second end plate 50 is provided with a second electrolytic cell on the side facing the second electrode plate 30, the second electrolytic cell corresponds to the porous area, the second end plate 50 also has a second inlet and a second outlet connected to the second electrolytic cell, the second end plate 50 has a second power connection portion 52, the second power connection portion 52 is connected to the second electrolytic cell, the first outlet 43 is connected to the separation inlet of the gas-liquid separation tank 60, and the liquid outlet of the gas-liquid separation tank 60 is connected to the second inlet.

[0036] The electrolyzer provided in this embodiment is applied, and the electrolyzer includes an anion exchange membrane 10, a first electrode plate 20, a second electrode plate 30, a first end plate 40, a second end plate 50 and a gas-liquid separation tank 60. The first end plate 40 and the second end plate 50 are connected to clamp the first electrode plate 20, the second electrode plate 30 and the anion exchange membrane 10. A porous area is set on the first electrode plate 20 and the second electrode plate 30. Since the porous area has a three-dimensional porous structure, the electrolyte can be uniformly penetrated in the porous area of ​​the first electrode plate 20 and the second electrode plate 30, so that the first electrode plate 20 and the second electrode plate 30 can not only serve as reaction electrodes, but also act as a diffusion layer of the electrolyte, so that the first electrode plate 20 and the second electrode plate 30 can be placed closer, thereby reducing the electrode spacing between the first electrode plate 20 and the second electrode plate 30, reducing the electrolysis resistance, and helping to reduce the voltage required for the electrolysis process, reduce energy consumption, and improve overall efficiency.

[0037] In addition, the porous area enables the first electrode plate 20 and the second electrode plate 30 to provide a larger electrochemically active specific surface area, promotes the adsorption of carbon dioxide and the deposition of metal ions by the first electrode plate 20 and the second electrode plate 30, increases the reaction activity of the first electrode plate 20 and the second electrode plate 30, and improves the mass transfer efficiency.

[0038] Among them, the first electrolytic cell 41 and the second electrolytic cell are jointly arranged to form an electrolytic cell of the electrolyzer, and the anion exchange membrane 10 separates the electrolytic cell into an anode reaction area (enclosed by the cell wall of the first electrolytic cell 41 and the anion exchange membrane 10) and a cathode reaction area (enclosed by the cell wall of the second electrolytic cell and the anion exchange membrane 10).

[0039] In this embodiment, the first power connection part 44 is connected to the positive electrode of the external power supply, and the second power connection part 52 is connected to the negative electrode of the external power supply. The organic amine solution absorbs carbon dioxide in the absorption tower to form a rich liquid. The rich liquid enters the first electrolytic cell 41 through the first inlet. In the first electrolytic cell 41, the anode metal of the first electrode plate 20 dissolves into the electrolyte solution at a certain potential, and the anode metal ions replace carbon dioxide to coordinate with the organic amine to form a complex. At this time, the desorbed carbon dioxide coexists with the electrolyte solution to form a high-pressure gas-liquid mixture, and the high-pressure gas-liquid mixture enters the gas-liquid separation tank 60 through the first outlet 43. In the gas-liquid separation tank 60, the carbon dioxide in the high-pressure gas-liquid mixture is separated from the electrolyte solution due to the pressure change. After the separation, the carbon dioxide gas enters the subsequent compression and transportation link, and the electrolyte solution enters the second electrolytic cell through the second inlet. After the metal is decomposed from the electrolyte solution in the second electrolytic cell, amine regeneration is achieved. The regenerated amine liquid can flow back into the absorption tower through the second outlet to participate in the carbon dioxide absorption again. This method effectively combines the high removal rate of the organic amine absorption method and the high efficiency of the electrochemical system, without the need for additional heating and steam, thereby reducing the energy consumption in the carbon dioxide capture process.

[0040] It should be noted that the first power connection part 44 is connected to the first electrolytic cell 41, which means that when the first power connection part 44 is connected to electricity, the electrolyte in the first electrolytic cell 41 can be connected to electricity, and the second power connection part 52 is connected to the second electrolytic cell, which means that when the second power connection part 52 is connected to electricity, the electrolyte in the second electrolytic cell can be connected to electricity.

[0041] like Figure 2 As shown, the first electrode plate 20 and the second electrode plate 30 both adopt an integral porous structure, and the electrolyzer further includes a first sealing ring 70 and a second sealing ring 80. The first sealing ring 70 is disposed on the outside of the first electrode plate 20, and the first sealing ring 70 seals the gap between the first end plate 40 and the anion exchange membrane 10. The second sealing ring 80 is disposed on the outside of the second electrode plate 30, and the second sealing ring 80 seals the gap between the second end plate 50 and the anion exchange membrane 10. Since the first electrode plate 20 and the second electrode plate 30 both adopt an integral porous structure, the proportion of the porous area is increased, and the first sealing ring 70 and the second sealing ring 80 can be used to prevent the electrolyte from seeping out from the outer edge of the first electrode plate 20 and the outer edge of the second electrode plate 30.

[0042] Specifically, the inner hole of the first sealing ring 70 is provided with a first annular groove, and the outer edge of the first electrode plate 20 is embedded in the first annular groove. The inner hole of the second sealing ring 80 is provided with a second annular groove, and the outer edge of the second electrode plate 30 is embedded in the second annular groove. The above structure facilitates the installation and positioning of the first sealing ring 70 and the second sealing ring 80.

[0043] like Figure 2 As shown, the first end plate 40 includes a first conductive plate 45 and a first insulating end plate 46, the first electrolytic cell 41 is arranged on the side of the first conductive plate 45 facing the first electrode plate 20, the first inlet 42, the first outlet 43 and the first power connection part 44 are all arranged on the first conductive plate 45, the first insulating end plate 46 is arranged on the side of the first conductive plate 45 away from the first electrode plate 20, the second end plate 50 includes a second conductive plate 53 and a second insulating end plate 54, the second electrolytic cell is arranged on the side of the second conductive plate 53 facing the second electrode plate 30, the second inlet, the second outlet and the second power connection part 52 are all arranged on the second conductive plate 53, the second insulating end plate 54 is arranged on the side of the second conductive plate 53 away from the second electrode plate 30, and the first insulating end plate 46 is connected to the second insulating end plate 54. With the first end plate 40 and the second end plate 50 of the above structure, when the first power connection part 44 and the second power connection part 52 are connected to electricity, the first conductive plate 45 and the second conductive plate 53 are charged as a whole, so that the electrolyte in the first electrolytic cell 41 and the electrolyte in the second electrolytic cell are connected to electricity, and a potential difference is formed between the electrolyte in the first electrolytic cell 41 and the electrolyte in the second electrolytic cell, and the first insulating end plate 46 is connected to the second insulating end plate 54, so as to form insulation protection of the electrolyzer at the outermost layer, thereby improving safety in use.

[0044] like Figure 2 As shown, the first inlet 42 and the first outlet 43 are both arranged on the side of the first conductive plate 45 away from the first electrode plate 20, the first insulating end plate 46 is provided with a first electrolysis inlet 461 connected to the first inlet 42, and the first insulating end plate 46 is also provided with a first electrolysis outlet 462 connected to the first outlet 43, the second inlet and the second outlet are both arranged on the side of the second conductive plate 53 away from the second electrode plate 30, the second insulating end plate 54 is provided with a second electrolysis inlet 541 connected to the second inlet, and the second insulating end plate 54 is also provided with a second electrolysis outlet 542 connected to the second outlet. With the above arrangement, on the side of the first insulating end plate 46 facing away from the anion exchange membrane 10, pipelines are connected to the first electrolysis inlet 461 and the first electrolysis outlet 462 through the first inlet 42 and the first outlet 43 respectively, and on the side of the second insulating end plate 54 facing away from the anion exchange membrane 10, pipelines are connected to the second electrolysis inlet 541 and the second electrolysis outlet 542 respectively through the second inlet and the second outlet, which facilitates the pipeline connection operation and improves the operational safety of the connected pipelines.

[0045] like Figure 1 As shown, the first power connection part 44 includes a first power connection lug disposed on the first conductive plate 45 and extending outwards, and a first power connection hole is disposed on the first power connection lug, and the second power connection part 52 includes a second power connection lug disposed on the second conductive plate 53 and extending outwards, and a second power connection hole is disposed on the second power connection lug. The first power connection part 44 and the second power connection part 52 of the above structure are adopted to connect the positive and negative terminals of the external power source to the first power connection hole and the second power connection hole respectively, so as to facilitate quick power connection, and because the first power connection lug is disposed on the first conductive plate 45 and extends outwards, and the second power connection lug is disposed on the second conductive plate 53 and extends outwards, safe operation is facilitated when connecting power, and electric shock caused by contact with conductive parts inside the electrolyzer is avoided, and damage to the sealing ring and other structures inside the electrolyzer is avoided.

[0046] like Figure 1 As shown, the first electrolytic cell 41 adopts a first serpentine flow channel 411, and the first inlet 42 and the first outlet 43 are respectively arranged corresponding to the two ends of the first serpentine flow channel 411, and the second electrolytic cell adopts a second serpentine flow channel, and the second inlet and the second outlet are respectively arranged corresponding to the two ends of the second serpentine flow channel. The above-mentioned first serpentine flow channel and second serpentine flow channel are used to ensure that the electrolyte flows from the first inlet 42 along the first serpentine flow channel to the first outlet 43, and the electrolyte flows from the second inlet along the second serpentine flow channel to the second outlet to cover most of the surface of the first electrode plate 20 and the second electrode plate 30. Compared with a linear or flow-channel-free electrolytic cell, the electrolyte can be more fully in contact with the first electrode plate 20 and the second electrode plate 30, reducing the area where the electrolyte cannot be used (i.e., flow dead corners) and reducing the reaction dead zone. When the electrolyte flows in a serpentine path, it will form a laminar flow-like flow state, which is conducive to the uniform transfer of substances, increases the contact between the electrolyte and the first electrode plate 20 and the second electrode plate, improves the desorption efficiency of carbon dioxide, improves the uniformity of the electrolyte flow in the first electrolytic cell 41 and the second electrolytic cell, improves the mass transfer efficiency, and ensures that the reaction can be carried out efficiently at each active site on the surface of the first electrode plate 20 and the second electrode plate 30.

[0047] Furthermore, in the process of capturing carbon dioxide by electrochemically mediated amine regeneration, carbon dioxide is released on the electrode surface to form bubbles. By using the above-mentioned first serpentine flow channel and the second serpentine flow channel, when the electrolyte flows in a serpentine path, the tortuous structure of the serpentine path can provide a certain shear force to help the bubbles detach from the electrode surface, and help the bubbles to move under the guidance of the serpentine flow channel, thereby reducing the residence time of the bubbles in the electrolytic cell and avoiding the bubbles from gathering on the electrode surface, thereby reducing the probability of bubble merging and reducing the size of the bubbles, making the bubbles easier to discharge, detaching from the electrode surface faster and moving upward, and finally discharged from the electrolytic cell through the outlet of the flow channel.

[0048] like Figure 1 As shown, the first serpentine flow channel 411 and the second serpentine flow channel are symmetrical with respect to the vertical axis of the anion exchange membrane 10, the first inlet 42 is located below the first outlet 43, the second inlet is located below the second outlet, the projection of the first inlet 42 on the anion exchange membrane 10 and the projection of the second inlet on the anion exchange membrane 10 are staggered left and right, and the projection of the first outlet 43 on the anion exchange membrane 10 and the projection of the second outlet on the anion exchange membrane 10 are staggered left and right. The above-mentioned staggered layout is adopted, so that the electrolyte in the first serpentine flow channel 411 and the second serpentine flow channel flows in opposite directions at the same height, thereby improving the reaction time of the electrolyte in the first electrolytic cell and the second electrolytic cell, and improving the exchange effect of the anion exchange membrane 10.

[0049] It should be noted that the left-right symmetry of the first serpentine flow channel 411 and the second serpentine flow channel relative to the vertical axis of the anion exchange membrane 10 means that the projections of the first serpentine flow channel 411 and the second serpentine flow channel on the anion exchange membrane 10 are left-right symmetric relative to the vertical axis of the anion exchange membrane 10. Specifically, the left-right direction is Figure 3 The X direction is shown.

[0050] like Figure 1 As shown, the groove width of the first serpentine flow channel 411 is between 1.4mm and 1.6mm, the groove depth of the first serpentine flow channel 411 is between 0.9mm and 1.1mm, the interval of the first serpentine flow channel 411 is between 0.4mm and 0.6mm, the groove width of the second serpentine flow channel is between 1.4mm and 1.6mm, the groove depth of the second serpentine flow channel is between 0.9mm and 1.1mm, and the interval of the second serpentine flow channel is between 0.4mm and 0.6mm.

[0051] In this embodiment, the porosity of the first electrode plate 20 and the porosity of the second electrode plate 30 are both between 50% and 80%.

[0052] like Figure 1 As shown, the thickness of the first electrode plate 20 and the thickness of the second electrode plate 30 are between 1 mm and 10 mm.

[0053] The groove width of the first serpentine flow channel 411 may be 1.4 mm, 1.5 mm, 1.6 mm or any value between 1.4 mm and 1.6 mm, the groove depth of the first serpentine flow channel 411 may be 0.9 mm, 1.0 mm, 1.1 mm or any value between 0.9 mm and 1.1 mm, the porosity of the first electrode plate 20 may be 50%, 60%, 70%, 80% or any value between 50% and 80%, and the porosity of the second electrode plate 30 may be 50 %, 60%, 70%, 80% or any value between 50% and 80%, the thickness of the first electrode plate 20 may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or any value between 1mm and 10mm, and the thickness of the second electrode plate 30 may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or any value between 1mm and 10mm.

[0054] It should be noted that the first serpentine flow channel 411 includes a plurality of first sub-flow channels arranged in parallel, and the plurality of first sub-flow channels all extend in the left-right direction. The groove width of the first serpentine flow channel 411 refers to the groove width of the first sub-flow channel, and the interval of the first serpentine flow channel 411 refers to the interval between two adjacent first sub-flow channels. The second serpentine flow channel includes a plurality of second sub-flow channels arranged in parallel, and the plurality of second sub-flow channels all extend in the left-right direction. The groove width of the second serpentine flow channel refers to the groove width of the second sub-flow channel, and the interval of the second serpentine flow channel refers to the interval between two adjacent second sub-flow channels.

[0055] like Figure 1 As shown, the first electrode plate 20 and the second electrode plate 30 are both made of metal copper, and the first sealing ring 70 and the second sealing ring 80 are both made of polytetrafluoroethylene material.

[0056] like Figure 1 As shown, the first end plate 40 and the second end plate 50 have the same structure, and the first end plate 40 and the second end plate 50 are symmetrically arranged relative to the anion exchange membrane 10, the first electrode plate 20 and the second electrode plate 30 have the same structure, and the first electrode plate 20 and the second electrode plate 30 are symmetrically arranged relative to the anion exchange membrane 10, adopting the above-mentioned symmetrical arrangement, and the first end plate 40 and the second end plate 50 have the same structure, the first electrode plate 20 and the second electrode plate 30 have the same structure, so that the first end plate 40 and the second end plate 50 can adopt the same processing technology and equipment, and the first electrode plate 20 and the second electrode plate 30 can adopt the same processing technology and equipment, which is convenient for processing and reduces costs.

[0057] like Figure 1As shown, the electrolyzer also includes a carbon dioxide collecting tank, and the gas outlet of the gas-liquid separation tank 60 is connected to the inlet of the carbon dioxide collecting tank. The carbon dioxide separated by the gas-liquid separation tank 60 is collected by the carbon dioxide collecting tank, so that the carbon dioxide can be uniformly collected for subsequent unified treatment or storage.

[0058] like Figure 1 As shown, the first end plate 40 is detachably connected to the second end plate 50. In the present embodiment, the first end plate 40 and the second end plate 50 are connected to clamp the first electrode plate 20, the second electrode plate 30 and the anion exchange membrane 10. By disassembling the first end plate 40 and the second end plate 50, the replacement of the first electrode plate 20 and the second electrode plate 30 is facilitated, thereby increasing the flexibility of use of the electrolyzer (according to different working conditions and reaction requirements, the thickness and material of the first electrode plate 20 and the second electrode plate 30 are flexibly adjusted to optimize the electrochemical performance of the electrolyzer), the convenience of maintenance and the life of the equipment (by regularly replacing or processing the first electrode plate 20 and the second electrode plate 30, the influence of electrode aging on the performance of the entire equipment can be effectively avoided, thereby extending the service life of the electrolyzer).

[0059] Another embodiment of the present invention provides an electrochemically mediated amine regeneration carbon capture device, which includes the electrolyzer provided above. The electrochemically mediated amine regeneration carbon capture device provided by this embodiment can also be used to set a porous area on the first electrode plate 20 and the second electrode plate 30. Since the porous area has a three-dimensional porous structure, the electrolyte can be uniformly infiltrated in the porous area of ​​the first electrode plate 20 and the second electrode plate 30, so that the first electrode plate 20 and the second electrode plate 30 can not only serve as reaction electrodes, but also act as a diffusion layer of the electrolyte, so that the first electrode plate 20 and the second electrode plate 30 can be placed closer, thereby reducing the electrode spacing between the first electrode plate 20 and the second electrode plate 30, reducing the electrolysis resistance, and helping to reduce the voltage required for the electrolysis process, reduce energy consumption, and improve overall efficiency.

[0060] In addition, the porous area enables the first electrode plate 20 and the second electrode plate 30 to provide a larger electrochemically active specific surface area, promotes the adsorption of carbon dioxide and the deposition of metal ions by the first electrode plate 20 and the second electrode plate 30, improves the reaction activity of the first electrode plate 20 and the second electrode plate 30, improves the mass transfer efficiency, improves the efficiency of the electrochemically mediated amine regeneration carbon capture device, reduces energy consumption, and realizes a more environmentally friendly and economical carbon capture technology.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0063] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0064] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0065] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrolyzer, characterized in that: The electrolyzer comprises: Anion exchange membrane (10); A first electrode plate (20) and a second electrode plate (30) are respectively arranged on both sides of the anion exchange membrane (10), and the first electrode plate (20) and the second electrode plate (30) both have a porous area arranged through them; A first end plate (40) is arranged on a side of the first electrode plate (20) facing away from the anion exchange membrane (10); a first electrolytic cell (41) is arranged on a side of the first end plate (40) facing the first electrode plate (20); the first electrolytic cell (41) corresponds to the porous area; the first end plate (40) further comprises a first inlet (42) and a first outlet (43) connected to the first electrolytic cell (41); the first end plate (40) comprises a first power connection portion (44); the first power connection portion (44) is in electrical communication with the first electrolytic cell (41); A second end plate (50) is arranged on a side of the second electrode plate (30) facing away from the anion exchange membrane (10) and connected to the first end plate (40); a second electrolytic cell is arranged on a side of the second end plate (50) facing the second electrode plate (30); the second electrolytic cell corresponds to the porous area; the second end plate (50) further comprises a second inlet and a second outlet connected to the second electrolytic cell; the second end plate (50) comprises a second power connection portion (52); the second power connection portion (52) is connected to the second electrolytic cell; A gas-liquid separation tank (60), wherein the first outlet (43) is communicated with a separation inlet of the gas-liquid separation tank (60), and the liquid outlet of the gas-liquid separation tank (60) is communicated with the second inlet.

2. The electrolyzer according to claim 1, characterized in that The first electrode plate (20) and the second electrode plate (30) both adopt an integral porous structure, and the electrolyzer further comprises: A first sealing ring (70) is disposed around the outside of the first electrode plate (20), and the first sealing ring (70) seals the gap between the first end plate (40) and the anion exchange membrane (10); The second sealing ring (80) is arranged around the outer side of the second electrode plate (30), and the second sealing ring (80) seals the gap between the second end plate (50) and the anion exchange membrane (10).

3. The electrolyzer according to claim 1, characterized in that The first end plate (40) comprises a first conductive plate (45) and a first insulating end plate (46); the first electrolytic cell (41) is arranged on a side of the first conductive plate (45) facing the first electrode plate (20); the first inlet (42), the first outlet (43) and the first power connection portion (44) are all arranged on the first conductive plate (45); and the first insulating end plate (46) is arranged on a side of the first conductive plate (45) facing away from the first electrode plate (20); The second end plate (50) comprises a second conductive plate (53) and a second insulating end plate (54); the second electrolytic cell is arranged on a side of the second conductive plate (53) facing the second electrode plate (30); the second inlet, the second outlet and the second power connection portion (52) are all arranged on the second conductive plate (53); and the second insulating end plate (54) is arranged on a side of the second conductive plate (53) facing away from the second electrode plate (30); The first insulating end plate (46) is connected to the second insulating end plate (54).

4. The electrolyzer according to claim 3, characterized in that The first inlet (42) and the first outlet (43) are both arranged on a side of the first conductive plate (45) away from the first electrode plate (20); the first insulating end plate (46) is provided with a first electrolysis inlet (461) connected to the first inlet (42); the first insulating end plate (46) is also provided with a first electrolysis outlet (462) connected to the first outlet (43); The second inlet and the second outlet are both arranged on a side of the second conductive plate (53) away from the second electrode plate (30); the second insulating end plate (54) is provided with a second electrolysis inlet (541) connected to the second inlet; the second insulating end plate (54) is also provided with a second electrolysis outlet (542) connected to the second outlet.

5. The electrolyzer according to claim 3, characterized in that The first power connection portion (44) comprises a first power connection lug which is arranged on the first conductive plate (45) and extends outwards, and a first power connection hole is arranged on the first power connection lug; The second power connection portion (52) comprises a second power connection lug which is arranged on the second conductive plate (53) and extends outwards, and a second power connection hole is arranged on the second power connection lug.

6. The electrolyzer according to claim 1, characterized in that The first electrolytic cell (41) adopts a first serpentine flow channel (411), and the first inlet (42) and the first outlet (43) are respectively arranged corresponding to two ends of the first serpentine flow channel (411); The second electrolytic cell adopts a second serpentine flow channel, and the second inlet and the second outlet are respectively arranged corresponding to the two ends of the second serpentine flow channel.

7. The electrolyzer according to claim 6, characterized in that The first serpentine flow channel (411) and the second serpentine flow channel are symmetrical with respect to the vertical axis of the anion exchange membrane (10); the first inlet (42) is located below the first outlet (43); the second inlet is located below the second outlet; a projection of the first inlet (42) on the anion exchange membrane (10) and a projection of the second inlet on the anion exchange membrane (10) are staggered left and right; a projection of the first outlet (43) on the anion exchange membrane (10) and a projection of the second outlet on the anion exchange membrane (10) are staggered left and right; and / or, The groove width of the first serpentine flow channel (411) is between 1.4 mm and 1.6 mm, the groove depth of the first serpentine flow channel (411) is between 0.9 mm and 1.1 mm, the interval of the first serpentine flow channel (411) is between 0.4 mm and 0.6 mm, the groove width of the second serpentine flow channel is between 1.4 mm and 1.6 mm, the groove depth of the second serpentine flow channel is between 0.9 mm and 1.1 mm, and the interval of the second serpentine flow channel is between 0.4 mm and 0.6 mm.

8. The electrolyzer according to any one of claims 1 to 7, characterized in that The porosity of the first electrode plate (20) and the porosity of the second electrode plate (30) are both between 50% and 80%; The thickness of the first electrode plate (20) and the thickness of the second electrode plate (30) are both between 1 mm and 10 mm.

9. The electrolyzer according to claim 2, characterized in that The first electrode plate (20) and the second electrode plate (30) are both made of metal copper; The first sealing ring (70) and the second sealing ring (80) are both made of polytetrafluoroethylene material.

10. The electrolyzer according to any one of claims 1 to 7, characterized in that The first end plate (40) and the second end plate (50) have the same structure, and the first end plate (40) and the second end plate (50) are symmetrically arranged relative to the anion exchange membrane (10); The first electrode plate (20) and the second electrode plate (30) have the same structure, and the first electrode plate (20) and the second electrode plate (30) are symmetrically arranged relative to the anion exchange membrane (10); The electrolyzer further comprises a carbon dioxide collection tank, and the gas outlet of the gas-liquid separation tank (60) is connected to the inlet of the carbon dioxide collection tank; The first end plate (40) and the second end plate (50) are detachably connected.

11. An electrochemically mediated amine regenerated carbon capture device, characterized in that: The electrochemically mediated amine regenerated carbon capture device comprises the electrolyzer according to any one of claims 1 to 10.

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