Carbon dioxide conversion device

Abstract

A carbon dioxide conversion device relates to the technical field of carbon dioxide conversion and comprises an anode chamber and a cathode chamber which are isolated, an anode electrode and a cathode electrode are arranged in the anode chamber and the cathode chamber respectively, the surface area of the cathode electrode is larger than that of the anode electrode under the same thickness, and the cathode chamber is divided into a liquid storage cavity and a gas storage cavity by the cathode electrode. The liquid storage cavity is provided with a cathode liquid inlet and a cathode liquid outlet which are used for conveying cathode electrolyte, the gas storage cavity is provided with a gas inlet used for conveying carbon dioxide gas and a gas outlet used for discharging reacted gas, and the cathode electrode is provided with a plurality of through holes penetrating through the two sides. And the cathode electrolyte and the carbon dioxide gas can alternately flow on the two sides of the cathode electrode. According to the scheme, carbon dioxide in an emission source can be converted into chemicals and materials with higher production and utilization values, and resource utilization of the carbon dioxide is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide conversion, in particular to a carbon dioxide conversion device. Background Art

[0002] As global climate change and environmental problems become increasingly severe, greenhouse gas emission reduction has become a common focus of the international community. Carbon dioxide (CO2) is one of the main greenhouse gases, and its emissions are closely related to global warming. At present, reducing CO2 emissions, saving resources, and developing new energy power generation technologies have become research hotspots in scientific research and industry.

[0003] Traditionally, research has focused on finding clean energy to replace fossil fuels in order to reduce the production of CO2. However, with the development of technology, research ideas have begun to shift from simple substitution to how to effectively recycle and utilize CO2. In particular, converting CO2 into chemicals and fuels with high added value can not only reduce greenhouse gas emissions, but also create economic value and realize the recycling of resources.

[0004] CO2 conversion technologies include chemical catalysis, biological conversion, electrochemical reduction and other methods. Among them, electrochemical reduction is considered to be a promising CO2 utilization technology due to its simple operation, mild conditions and high product selectivity. Through this method, CO2 can be converted into useful chemicals and fuels such as methane (CH4), carbon monoxide (CO), formic acid (HCOOH), methanol (CH3OH), ethanol (C2H5OH), etc. This is called CO2 energy conversion post-processing.

[0005] However, existing CO2 conversion technologies still face some challenges, such as low conversion efficiency, high cost, and complex equipment. Especially in industrial applications, how to convert CO2 into useful chemicals efficiently and at low cost remains an urgent problem to be solved. Especially in coal combustion processes, such as power plants and factories, these places are the main sources of CO2 emissions. Therefore, the development of a device that can directly treat CO2 from these emission sources is of great significance for achieving the effective utilization of CO2 and reducing environmental pollution. Utility Model Content

[0006] The purpose of the utility model is to provide a device capable of converting carbon dioxide in an emission source so as to realize resource utilization of carbon dioxide.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a carbon dioxide conversion device, comprising an isolated anode chamber and a cathode chamber, wherein an anode electrode and a cathode electrode are respectively arranged in the anode chamber and the cathode chamber, and at the same thickness, the surface area of ​​the cathode electrode is greater than the surface area of ​​the anode electrode, and the cathode chamber is divided into a liquid storage chamber and a gas storage chamber by the cathode electrode, and the liquid storage chamber is provided with a cathode liquid inlet and a cathode liquid outlet for conveying cathode electrolyte, and the gas storage chamber is provided with an air inlet for conveying carbon dioxide gas and an air outlet for discharging reacted gas, and the cathode electrode is provided with a plurality of through holes penetrating both sides so that the cathode electrolyte and carbon dioxide gas can flow alternately on both sides of the cathode electrode.

[0008] Furthermore, a flow channel block is closely attached to one side of the gas storage cavity of the cathode electrode, and a curved groove is provided on one side of the flow channel block close to the cathode electrode, and the groove is connected to the air inlet and the air outlet through a conveying channel.

[0009] Furthermore, the area of ​​the cathode electrode covered by the groove corresponds to the projection area of ​​the liquid storage cavity on the cathode electrode.

[0010] Furthermore, the cathode electrode is a porous electrode made of copper-based nanoarray material.

[0011] Furthermore, the cathode liquid inlet and the cathode liquid outlet are commonly connected to a cathode liquid storage tank.

[0012] Furthermore, the anode chamber is provided with an anode liquid inlet and an anode liquid outlet for conveying an anode electrolyte, and the anode chamber and the cathode chamber are separated by a diaphragm, and the diaphragm is a proton exchange membrane.

[0013] The purpose of separating the anode chamber from the cathode chamber is to reduce other side reactions after the products of the cathode and anode meet and to reduce product impurities. The purpose of using a proton exchange membrane for separation is to improve conductivity. In addition, the proton exchange membrane can use a fuel cell exchange membrane, such as N115 proton exchange membrane or N117 perfluorosulfonic acid ion membrane.

[0014] Wherein, both the anolyte and the catholyte can be potassium bicarbonate solution.

[0015] Furthermore, the anode liquid inlet and the anode liquid outlet are commonly connected to an anode liquid storage tank.

[0016] Furthermore, the above-mentioned device also includes an anode plate, an intermediate plate and a cathode plate which are connected in sequence in a detachable manner and each of the three plates is provided with a cavity, the diaphragm is installed in the cavity of the intermediate plate and separates it into two left and right parts, the cavity of the anode plate is connected to the left part of the cavity of the intermediate plate to form the anode chamber, and the cavity of the cathode plate is connected to the right part of the cavity of the intermediate plate to form the cathode chamber.

[0017] Furthermore, an annular boss surrounding the cavity of the anode plate is provided on the left side and a spiral pressing block is threadedly connected to the annular boss, and a conductive metal block and a graphite block are provided on the left side of the anode electrode. The conductive metal block, graphite block and anode electrode are sequentially arranged in the anode chamber from left to right, and a conductive boss passing through the spiral pressing block is provided at the end of the conductive metal block.

[0018] Furthermore, the device is equipped with a photovoltaic panel, and the cathode panel is provided with a conductive column that contacts the cathode electrode or extends into the cathode chamber to contact the cathode electrolyte, and the conductive protrusion and the conductive column are respectively connected to the positive and negative electrodes of the photovoltaic panel.

[0019] The carbon dioxide conversion device of the utility model adopts electrochemical catalytic reduction technology, which can efficiently convert electrical energy into chemical energy under normal temperature and pressure conditions. This technology has the advantages of simple reaction conditions, a wide source of catalytic materials, and easy control of the reaction process. Compared with the photocatalytic reduction method, its conversion efficiency is more outstanding. In particular, the surface area of ​​the cathode electrode in the device is larger than that of the anode electrode. This design helps to improve the efficiency of the electrochemical reaction. The larger cathode electrode provides more active sites and reaction areas, thereby increasing the chance of contact with carbon dioxide molecules and promoting the reduction reaction. In addition, the multiple through holes provided on the cathode electrode can significantly improve the conversion rate of carbon dioxide.

[0020] Applying the above-mentioned carbon dioxide conversion device to tail gas emission sites such as power plants can effectively post-process the exhaust gas, generate high-value-added chemicals and fuels such as methane (CH4) and carbon monoxide (CO), and realize the recycling of carbon dioxide in the tail gas. This not only helps to reduce CO2 emissions in the atmosphere and alleviate environmental degradation, but also effectively responds to the challenge of the decreasing fossil energy, promotes the reuse of CO2, and promotes the development of green circular energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded view of a carbon dioxide conversion device in an embodiment;

[0022] Figure 2 The three-dimensional carbon dioxide conversion device in the embodiment Figure 1 ;

[0023] Figure 3 The three-dimensional carbon dioxide conversion device in the embodiment Figure 2 ;

[0024] Figure 4 is a cross-sectional view of a carbon dioxide conversion device in an embodiment;

[0025] Figure 5A three-dimensional diagram of a flow channel block in an embodiment;

[0026] Figure 6 It is a schematic diagram of the structure in which the carbon dioxide conversion device is installed in the box body in the embodiment.

[0027] In the figure:

[0028] 1——Anode chamber 1a——Anode liquid inlet

[0029] 1b——anode outlet 2——cathode chamber

[0030] 2a——Cathode liquid inlet 2b——Cathode liquid outlet

[0031] 2c - air inlet 2d - air outlet

[0032] 3——Anode electrode 4——Cathode electrode

[0033] 5——Flow channel block 5a——Groove

[0034] 5b——annular boss 6——diaphragm

[0035] 7——Anode plate 7a——Annular protrusion

[0036] 7b——annular protrusion 8——middle plate

[0037] 9——Cathode plate 9a——Installation step

[0038] 10——Spiral pressing block 11——Conductive metal block

[0039] 11a——conductive protruding rod 12——graphite block

[0040] 13——Conductive column 14——Reference electrode

[0041] 15——Partition 16——Transportation channel

[0042] 17——Box body. DETAILED DESCRIPTION

[0043] In the description of the present invention, it should be understood that the terms "front", "rear", "inside", "outside" 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 present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The term "plurality" means more than two (including two).

[0044] In order to facilitate those skilled in the art to understand the improvements of the present invention over the prior art, the present invention is further described below in conjunction with embodiments and drawings.

[0045] like Figure 1-5 As shown, this embodiment provides a carbon dioxide (CO2) conversion device for treating a large amount of tail gas emitted by power plants and factories. The device can be installed at the location where the tail gas of the power plant is emitted, and directly converts the CO2 in the tail gas into high value-added chemicals and fuels such as methane (CH4), carbon monoxide (CO), ethylene (C2H4), hydrogen (H2), etc. at room temperature through electrochemical catalytic reduction. These chemicals and fuels have a wide range of industrial applications and economic value.

[0046] like Figure 4 As shown, the carbon dioxide conversion device of this embodiment consists of two independently separated chambers: an anode chamber 1 and a cathode chamber 2. The two chambers are separated by a layer of proton exchange membrane. The proton exchange membrane is a special material that allows protons (H+) to pass through, but does not allow electrons to pass through. This selective transmission characteristic allows a potential difference to be formed on both sides of the membrane. In the anode chamber 1, water molecules in the electrolyte undergo oxidation reactions on the surface of the anode material, releasing electrons. These electrons cannot pass through the proton exchange membrane, so they flow to the cathode chamber 2 through an external circuit. This process not only drives the oxidation reaction of the anode, but also provides electrical energy for the entire system. In the cathode chamber 2, the electrons reach the cathode through an external circuit and undergo a reduction reaction with the carbon dioxide molecules in the electrolyte. This process produces useful chemicals such as carbon monoxide (CO), methane (CH4), ethylene (C2H4) or other carbon-based compounds, and the specific products depend on the reaction conditions and the properties of the catalyst. This reduction reaction promotes the conversion of carbon dioxide, converting it from a greenhouse gas to a valuable product. This device not only helps to reduce greenhouse gas emissions, but also provides a new source of raw materials for industrial production.

[0047] The anode electrode 3 and the cathode electrode 4 are immersed in the electrolyte in their respective chambers. This immersion can be whole immersion, that is, the entire electrode is surrounded by the electrolyte, or only the end surface is immersed, that is, only one end surface of the electrode is in contact with the electrolyte. Among them, taking the example of using potassium bicarbonate solution as both the anode electrolyte and the cathode electrolyte, no carbon dioxide gas is input into the anode chamber 1, and carbon dioxide gas is input into the cathode chamber 2, the electrochemical reaction process is as follows:

[0048] 1. Anode process: In the anode chamber 1, water molecules in the potassium bicarbonate solution lose electrons on the surface of the anode electrode 3, undergoing an oxidation reaction to generate oxygen and protons (H+). This process is the starting point for energy conversion in an electrochemical cell.

[0049] 2. Electron flow: The electrons released by the anode electrode 3 move to the cathode electrode 4 through an external circuit connecting the anode and cathode. This step is the core of the conversion of electrical energy into chemical energy, ensuring the energy supply of the entire electrochemical reaction.

[0050] 3. Proton exchange membrane: The proton exchange membrane allows protons (H+) to migrate from the anode chamber 1 to the cathode chamber 2, while preventing electrons and gases from directly passing through, ensuring the balance of charge and the migration of protons during the reaction.

[0051] 4. Cathode process: In the cathode chamber 2, the input carbon dioxide gas combines with the protons that migrate to the cathode chamber 2 through the proton exchange membrane and receives electrons from the external circuit. In this process, the carbon dioxide molecules capture electrons and protons, undergo a reduction reaction, and are converted into valuable chemicals or fuels, such as methane (CH4), carbon monoxide (CO), etc.

[0052] In order to improve the effective use of electric energy, the volume of the cathode electrode 4 is designed to be larger than that of the anode electrode 3 in this embodiment. Specifically, at the same thickness, the surface area of ​​the cathode electrode 4 is larger than that of the anode electrode 3. Figure 1 , 4 This design provides a larger active surface area, increasing the contact opportunities with CO2 molecules, which helps to increase the rate of CO2 reduction reaction (CO2RR). The larger cathode volume can accommodate more active sites, promote the efficient transfer of electrons, and help to distribute the current more evenly.

[0053] The interior of the cathode chamber 2 is divided into two parts by the cathode electrode 4: a liquid storage chamber on the left and a gas storage chamber on the right. The liquid storage chamber is responsible for storing the cathode electrolyte, and transporting and circulating the electrolyte through the cathode liquid inlet 2a and the cathode liquid outlet 2b. The gas storage chamber is used to store and transport carbon dioxide gas, and is provided with an air inlet 2c to introduce carbon dioxide, and an air outlet 2d to discharge the gas generated after the reaction. In order to promote the effective contact and reaction of the cathode electrolyte and carbon dioxide gas on both sides of the electrode, a plurality of through holes penetrating both sides of the electrode are provided on the cathode electrode 4. These through holes not only increase the reaction surface area, but also improve mass transfer, so that the electrolyte and gas can flow alternately on both sides of the cathode electrode 4, thereby improving the conversion efficiency of carbon dioxide.

[0054] Through the above settings, the carbon dioxide conversion device can efficiently convert electrical energy into chemical energy at normal temperature and pressure, realize the reduction reaction of carbon dioxide, and generate valuable gas phase products such as methane and ethylene. This device is particularly suitable for tail gas emission sites such as power plants, which helps to realize the reuse of CO2 and the development of green recycling energy.

[0055] Among them, the multiple through holes provided on the cathode electrode 4 can significantly improve the conversion rate of carbon dioxide by increasing the reaction surface area, improving mass transfer and improving the gas-electrolyte contact efficiency. Specifically, in the electrochemical catalytic reduction process, the multiple through holes provided on the cathode electrode 4 can improve the conversion efficiency of carbon dioxide. This improvement is mainly achieved through the following aspects: 1. Increase the reaction surface area: The through holes can increase the surface area of ​​the electrode, provide space for more catalytic active sites, thereby increasing the chances of carbon dioxide molecules contacting the catalytic material. 2. Improve mass transfer: The through holes help the diffusion of carbon dioxide on the electrode surface, reduce the diffusion restrictions caused by the concentration gradient, and make it easier for reactants to reach the catalytic sites. 3. Improve gas-electrolyte contact efficiency: The through hole design can improve the contact between the gas (carbon dioxide) and the electrolyte, which is crucial for electron transfer and chemical reactions in the electrochemical process.

[0056] In the carbon dioxide conversion device of this embodiment, the gas storage chamber of the cathode electrode 4 is in close contact with a gas flow channel block 5. The gas flow channel block 5 is provided with a curved continuous groove 5a on the side close to the cathode electrode 4, for example, a serpentine design is adopted to increase the contact area and efficiency of gas flow, as shown in FIG. Figure 5 . These grooves 5a are connected to the gas inlet 2c and the gas outlet 2d of the device through the delivery channel 16, ensuring that the carbon dioxide gas can smoothly enter and leave the reaction area. In particular, the grooves 5a cover a specific area of ​​the cathode electrode 4 and correspond to the projected area of ​​the liquid storage chamber on the cathode electrode 4. The grooves 5a provide a clear flow path for the carbon dioxide gas, ensuring that the gas can flow directly to the reaction area of ​​the cathode electrode 4. The gas flow guided by the grooves 5a increases the chance of carbon dioxide contacting the electrolyte, thereby improving the efficiency of gas dissolution and participation in electrochemical reactions. The groove 5a design helps to form more uniform reaction conditions on the surface of the cathode electrode 4 and promote the uniform progress of the electrochemical reaction. The grooves 5a can reduce the disordered accumulation of gas on the electrode surface and prevent bubbles from covering the active area, thereby maintaining the reaction efficiency of the electrode. The structure of the grooves 5a can also optimize gas flow and reduce turbulence and eddy currents, which helps to improve the conversion efficiency of carbon dioxide.

[0057] In this embodiment, the cathode electrode 4 is a porous electrode made of a copper-based nanoarray material. The nanoarray structure provides a large specific surface area, increases the number of active sites, thereby increasing the chance of contact between the electrode and the carbon dioxide molecules and accelerating the electrochemical reaction rate. The copper-based material itself has good electrical conductivity, which helps to quickly and effectively transmit electrons and promote the reduction reaction. The porous design not only increases the contact area with the gas and the electrolyte, but also helps to improve mass transfer, allowing carbon dioxide and products to diffuse more evenly on the electrode surface.

[0058] In this embodiment, the cathode liquid inlet 2a and the cathode liquid outlet 2b are connected to a cathode liquid storage tank (not shown in the figure) to realize the recycling of the cathode electrolyte. The cathode liquid inlet 2a is responsible for transporting the electrolyte in the liquid storage tank to the cathode chamber 2, ensuring that the electrode surface is always covered with sufficient electrolyte to maintain the electrochemical reaction. The electrolyte passing through the cathode chamber 2, carrying the reaction products and possible by-products, returns to the liquid storage tank through the cathode liquid outlet 2b. The liquid storage tank not only serves as a storage container for the electrolyte, but also can be supplemented or adjusted as needed. The concentration and composition of the electrolyte can be optimized. By recycling the electrolyte, the consumption of raw materials is reduced, while the utilization efficiency of the electrolyte is improved and the operating cost is reduced.

[0059] In this embodiment, the anode chamber 1 is provided with an anode inlet 1a and an anode outlet 1b for conveying the anode electrolyte to maintain the flow and renewal of the electrolyte. The anode chamber 1 and the cathode chamber 2 are separated by a diaphragm 6 (i.e., a proton exchange membrane), which allows protons (H+) to pass through while preventing direct electron transfer to ensure the effective use of electrical energy. The anode electrode 3 causes the water molecules in the electrolyte to lose electrons in the electrochemical reaction, undergoing an oxidation reaction to generate oxygen. This process is a process of power consumption and helps to maintain the progress of the electrochemical reaction. Electrons flow from the anode to the cathode through an external circuit, while protons migrate through the proton exchange membrane to complete the entire electrochemical reaction cycle.

[0060] In this embodiment, the anode liquid inlet 1a and the anode liquid outlet 1b are connected to an anode liquid storage tank (not shown in the figure) to realize the recycling of the anode electrolyte. The principle is similar to that of the cathode liquid storage tank and will not be repeated here.

[0061] The carbon dioxide conversion device of this embodiment can adopt a modular block design, including an anode plate 7, an intermediate plate 8 and a cathode plate 9, which are connected in sequence in a detachable manner (for example, by bolting) to facilitate assembly and maintenance. Each plate is provided with a cavity to form a key part of the device: 1. Anode chamber 1: The cavity of the anode plate 7 is connected to the left cavity of the intermediate plate 8, together forming the anode chamber 1. An anode electrode 3 is provided in the anode chamber 1 for oxidation reaction. 2. Cathode chamber 2: The cavity of the cathode plate 9 is connected to the right cavity of the intermediate plate 8, together forming the cathode chamber 2. A cathode electrode 4 is provided in the cathode chamber 2 for reduction reaction. 3. Proton exchange membrane: A proton exchange membrane is installed in the cavity of the intermediate plate 8, which separates the cavity of the intermediate plate 8 into two parts, left and right, to ensure effective isolation of the anode chamber 1 and the cathode chamber 2. In addition, in order to improve the durability and chemical stability of the device, the anode plate 7, the intermediate plate 8 and the cathode plate 9 are all made of square polyetheretherketone (PEEK) material. PEEK sheets have excellent mechanical properties and chemical corrosion resistance and are suitable for use in electrochemical environments.

[0062] In this embodiment, an annular boss 7a is provided on the left side of the anode plate 7, the cavity of the anode plate 7 is located in the middle of the annular boss 7a, a spiral pressing block 10 is threadedly connected to the annular boss 7a, a conductive metal block 11 and a graphite block 12 are provided between the right side of the spiral pressing block 10 and the left side of the anode electrode 3, the conductive metal block 11, the graphite block 12, and the anode electrode 3 are sequentially arranged in the anode chamber 1 from left to right, and a conductive convex rod 11a is provided at the left end of the conductive metal block 11, and the conductive convex rod 11a extends outward through the through hole on the spiral pressing block 10. The conductive convex rod 11a is made of a conductive material, which is responsible for connecting the anode to the positive electrode of an external power source. In an electrochemical device, the anode is connected to the positive electrode of the power source so that an oxidation reaction occurs on the anode. For example, when a photovoltaic panel is used as a power source, the photovoltaic panel converts solar energy into electrical energy, and then transmits the electrical energy to the anode through the conductive convex rod 11a, thereby driving the electrochemical reaction.

[0063] In general, this embodiment provides a conversion device for treating carbon dioxide in exhaust gas emitted by power plants, factories, etc., also known as a "membrane electrode". Figure 1-4 As shown, the composition and function of the device are as follows: spiral pressing block 10: used to fix the various components on the anode plate 7 to ensure the stability of the structure. Conductive metal block 11: directly in contact with graphite block 12, plays the role of conducting electricity and fixing the anode electrode 3. Graphite block 12: mainly responsible for conducting electricity and enhancing the conductivity of the electrode. Anode electrode 3 (abbreviated as "anode") is the main place for oxidation reaction. Anode plate 7 provides necessary support and reaction space for the anode. Thin film (i.e. diaphragm 6 / separation membrane): such as proton exchange membrane, used to isolate cathode chamber 2 and anode chamber 1. Cathode electrode 4 (abbreviated as "cathode"): as the place for carbon dioxide reduction reaction. Flow channel block 5: has a curved groove 5a to increase the contact area between gas and cathode and improve reaction efficiency. Liquid inlet and outlet: the inlet and outlet channel of electrolyte. Intermediate plate 8: an important component of membrane electrode, providing reaction space for cathode. Cathode plate 9: an important component of membrane electrode, together with intermediate plate 8, constitutes cathode chamber 2. Gas inlet and outlet: used for input and output of carbon dioxide and generated gas. The conductive column 13 is arranged on the cathode plate 9 and extends into the cathode chamber 2, directly contacts the cathode electrode 4 or contacts the cathode electrolyte, and mainly plays a conductive role. It can be connected to the negative electrode of an external power source (such as a photovoltaic panel), so that the cathode is connected to the negative electrode of the power source. This connection allows electrons to flow from the negative electrode of the power source to the cathode, driving the reduction reaction on the cathode, such as the carbon dioxide reduction reaction or other desired electrochemical processes. Reference electrode 14 (optional): can be set on the intermediate plate 8 to monitor and control the potential of the electrochemical reaction.

[0064] Among them, the left side of the cathode plate 9 is provided with an inwardly concave mounting step 9a, and the left end of the flow channel block 5 is provided with an annular boss 5b protruding in all directions. The annular boss 5b is placed on the mounting step 9a, and the flow channel block 5 can be well fixed through the clamping action of the cathode plate 9 and the intermediate plate 8. The cavity of the anode plate 7 is provided with an annular protrusion 7b (protruding into the cavity) for resisting the anode electrode 3 to reserve space to form the anode chamber 1. A partition 15 is provided in the middle of the cavity of the intermediate plate 8, and a connecting port (such as a square channel) is opened in the middle of the partition 15 that passes through the left and right. The diaphragm 6 is fixed on the left side of the partition 15 (for example, adhesive fixation or other mechanical structure fixation), and the cathode electrode 4 is installed on the right side of the partition 15 and is resisted by the flow channel block 5.

[0065] In the present embodiment, corresponding delivery channels 16 are provided on the flow channel block 5 and the cathode plate 9, and these channels are used to connect the groove 5a and the gas inlet 2c and the gas outlet 2d. In order to ensure that the delivery channels 16 on the flow channel block 5 and the cathode plate 9 can be quickly and accurately aligned during the assembly process, strip grooves and strip positioning blocks can be respectively provided on the outer wall of the flow channel block 5 and the inner cavity side wall of the cathode plate 9. This positioning structure not only helps to quickly align, but also prevents the flow channel block 5 from rotating or shifting in the inner cavity of the cathode plate 9. For the shape of the flow channel block 5, if it is cylindrical, additional positioning structures may be required to ensure precise alignment. If the flow channel block 5 or the annular boss 5b at its left end is rectangular or square, due to its regular geometric shape, it is easier to achieve automatic alignment, thereby reducing the need for complex positioning structures.

[0066] The carbon dioxide conversion device of this embodiment can achieve effective conversion of carbon dioxide by the following steps:

[0067] 1. Start-up process: When the device starts to treat tail gas, the electrolyte flows into the anode chamber 1 through the anode liquid inlet 1a.

[0068] 2. Anode reaction: In the anode chamber 1, the electrolyte participates in the electrochemical reaction, and the oxygen evolution reaction (OER) occurs to generate oxygen. In this process, the anode electrode 3 causes water molecules to lose electrons and oxidize to generate oxygen and protons. This process is the release of electrons, which then flow to the cathode through the external circuit, thereby promoting the entire electrochemical reaction.

[0069] 3. Anode electrolyte circulation: The electrolyte after the reaction flows out through the anode liquid outlet 1b and enters the anode liquid storage tank. After necessary adjustment or replenishment, the electrolyte enters the anode chamber 1 again through the anode liquid inlet 1a to form a cycle.

[0070] 4. Cathode reaction: At the same time, the electrolyte enters the cathode chamber 2 through the cathode liquid inlet 2a. Since the diaphragm 6 is installed in the middle plate 8, the reactions of the cathode chamber 2 and the anode chamber 1 do not interfere with each other, ensuring the independence and efficiency of the reactions.

[0071] 5. Gas treatment: The purified and dried tail gas (mainly carbon dioxide) enters the gas flow channel block 5 through the gas inlet 2c, and then enters the cathode chamber 2. Here, carbon dioxide mixes with the electrolyte and undergoes a reduction reaction (CO2RR) to generate hydrocarbons (such as methane CH4).

[0072] 6. Product output: The generated gas product is discharged through the outlet 2d, completing the conversion process.

[0073] 7. Cathodic electrolyte circulation: The electrolyte after the reaction flows into the cathode liquid storage tank through the cathode liquid outlet 2b. After treatment, the electrolyte enters the cathode chamber 2 again through the cathode liquid inlet 2a, forming a cycle.

[0074] 8. Electrolyte maintenance: In order to maintain the stability and efficiency of the reaction, the electrolyte needs to be replaced and maintained regularly.

[0075] In actual use, an alkaline electrolyte can be used as the cathode electrolyte, usually potassium hydroxide (KOH) or sodium hydroxide (NaOH) as the electrolyte. Alkaline conditions help to improve the reduction efficiency of CO2 and may promote the generation of certain specific products (such as methane). The cathode electrolyte can also use an acidic electrolyte, usually sulfuric acid (H2SO4) or phosphoric acid (H3PO4) and the like. Acidic conditions may be more conducive to the generation of oxygen-containing compounds such as ethylene and ethanol. Of course, other types of electrolytes can also be used as the cathode electrolyte, which can be selected as needed. In addition, the anolyte can select an electrolyte similar to the catholyte, which can be selected as needed. Of course, the selection of the anolyte should be based on the specific oxidation reaction type occurring at the anode, and the same applies to the catholyte. In this embodiment, potassium bicarbonate solution is selected for both the anolyte and the catholyte.

[0076] In this embodiment, the cathode electrode 4 uses a copper-based electrode catalytic material. Copper can directly convert CO2 into different types of products, such as hydrocarbons (such as methane, ethylene and other alkanes), alcohols (such as methanol, ethanol, etc.), aldehydes, etc. For catalysts, copper is not only cheap and green in the market, but also can save a lot of costs in the production process. In addition, copper has a special advantage in reducing CO2 among many metal catalysts. For example, Ag-loaded copper-based nanoarray electrode material is selected as the negative electrode, which has high selectivity for room temperature electrochemical reduction of CO2 to produce ethanol.

[0077] The carbon dioxide conversion device of this embodiment uses electrochemical catalytic reduction as the core means of CO2 reduction. This method operates at room temperature and pressure, directly converts electrical energy into chemical energy, and has the advantages of high conversion efficiency, simple reaction conditions, and easy availability of catalytic materials. Compared with the photocatalytic reduction method, it is not limited by light, the product conversion rate is not limited, and the efficiency is higher; compared with the biotechnology conversion method, it avoids the problems of long reaction time and difficulty in controlling biological materials, showing great potential in industrial applications.

[0078] In terms of the choice of electrodes (such as cathodes), this device uses copper-based array nanomaterials to make porous electrodes. This material, with its regularly arranged nanostructure and uniform size, provides excellent physical and chemical properties and is suitable for efficient electrocatalytic reactions. The copper-based nanoarray not only has a simple preparation process and low cost, but its porous properties also greatly increase the surface area in contact with CO2, thereby accelerating the reaction rate and improving the conversion efficiency of CO2. This choice enables the device to perform well in both energy conversion and catalytic performance, providing strong support for the development of green chemistry and sustainable energy technologies.

[0079] In addition, the carbon dioxide conversion device can be connected to a photovoltaic panel, which absorbs solar energy and converts it into electrical energy to provide a driving potential for carbon dioxide reduction. In order to improve the conversion capacity and efficiency, multiple groups of carbon dioxide conversion devices can be set up, which are installed in a box body 17 at intervals, and the box body 17 is equipped with corresponding liquid inlet, liquid outlet, air inlet, air outlet and other components, which can be seen in Figure 6 .

[0080] The above is only the preferred implementation of the utility model, and does not constitute any form of limitation on the utility model. Although the utility model has been disclosed as the preferred embodiment as above, it is not used to limit the product form and style of the utility model. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments with equivalent changes without departing from the scope of the technical solution of the utility model. All contents that do not depart from the technical solution of the utility model belong to the patent scope of the technical solution of the utility model.

Claims

1. A carbon dioxide conversion device, characterized in that: The invention comprises an isolated anode chamber (1) and cathode chamber (2), wherein an anode electrode (3) and a cathode electrode (4) are respectively arranged in the anode chamber (1) and the cathode chamber (2), wherein the surface area of ​​the cathode electrode (4) is larger than the surface area of ​​the anode electrode (3) at the same thickness, and the cathode chamber (2) is divided into a liquid storage chamber and a gas storage chamber by the cathode electrode (4), wherein the liquid storage chamber is provided with a cathode liquid inlet (2a) and a cathode liquid outlet (2b) for conveying cathode electrolyte, and the gas storage chamber is provided with an air inlet (2c) for conveying carbon dioxide gas and an air outlet (2d) for discharging reacted gas, and the cathode electrode (4) is provided with a plurality of through holes penetrating both sides, so that the cathode electrolyte and the carbon dioxide gas can flow alternately on both sides of the cathode electrode (4).

2. The carbon dioxide conversion device according to claim 1, characterized in that: A flow channel block (5) is closely attached to one side of the gas storage cavity of the cathode electrode (4); a curved groove (5a) is provided on the side of the flow channel block (5) close to the cathode electrode (4); and the groove (5a) is connected to the gas inlet (2c) and the gas outlet (2d) via a delivery channel (16).

3. The carbon dioxide conversion device according to claim 2, characterized in that: The area of ​​the cathode electrode (4) covered by the groove (5a) corresponds to the projection area of ​​the liquid storage cavity on the cathode electrode (4).

4. The carbon dioxide conversion device according to claim 1, characterized in that: The cathode electrode (4) is a porous electrode made of a copper-based nanoarray material.

5. The carbon dioxide conversion device according to claim 1, characterized in that: The cathode liquid inlet (2a) and the cathode liquid outlet (2b) are commonly connected to a cathode liquid storage tank.

6. The carbon dioxide conversion device according to claim 1, characterized in that: The anode chamber (1) is provided with an anode liquid inlet (1a) and an anode liquid outlet (1b) for conveying an anode electrolyte. The anode chamber (1) and the cathode chamber (2) are separated by a diaphragm (6), and the diaphragm (6) is a proton exchange membrane.

7. The carbon dioxide conversion device according to claim 6, characterized in that: The anode liquid inlet (1a) and the anode liquid outlet (1b) are commonly connected to an anode liquid storage tank.

8. The carbon dioxide conversion device according to claim 6, characterized in that: The invention comprises an anode plate (7), an intermediate plate (8) and a cathode plate (9) which are connected in sequence in a detachable manner, and each of the three plates is provided with a cavity, the diaphragm (6) is installed in the cavity of the intermediate plate (8) and separates it into two parts, the cavity of the anode plate (7) and the left part of the cavity of the intermediate plate (8) are connected to form the anode chamber (1), and the cavity of the cathode plate (9) and the right part of the cavity of the intermediate plate (8) are connected to form the cathode chamber (2).

9. The carbon dioxide conversion device according to claim 8, characterized in that: The left side of the anode plate (7) is provided with an annular protrusion (7a) surrounding the cavity thereof, and a spiral pressing block (10) is threadedly connected to the annular protrusion (7a); the left side of the anode electrode (3) is provided with a conductive metal block (11) and a graphite block (12); the conductive metal block (11), the graphite block (12), and the anode electrode (3) are sequentially arranged in the anode chamber (1) from left to right; and the end of the conductive metal block (11) is provided with a conductive protrusion (11a) passing through the spiral pressing block (10).

10. The carbon dioxide conversion device according to claim 9, characterized in that: The device is equipped with a photovoltaic panel, the cathode plate (9) is provided with a conductive column (13) that contacts the cathode electrode (4) or extends into the cathode chamber (2) to contact the cathode electrolyte, and the conductive protrusion (11a) and the conductive column (13) are respectively connected to the positive electrode and the negative electrode of the photovoltaic panel.

Images