Carbon dioxide conversion system

Abstract

The carbon dioxide conversion system comprises a first mixing chamber, an electrochemical reactor, a first conversion unit and a second conversion unit, the feeding end of the first mixing chamber is suitable for introducing a to-be-reacted object and water; the discharge end of the first mixing chamber is communicated with the feed end of the electrochemical reactor, and the electrochemical reactor is configured to perform a water half-splitting reaction on water to generate hydroxyl ions and hydrogen ions, and respectively react with a to-be-reacted object based on the generated hydroxyl ions and hydrogen ions to generate a first product and a second product; the feeding end of the first conversion unit is communicated with the first discharging end of the electrochemical reactor, and the first conversion unit is configured to convert a first product generated by the electrochemical reactor; the feeding end of the second conversion unit is communicated with the second discharging end of the electrochemical reactor, and the second conversion unit is configured to capture carbon dioxide by using a second product generated by the electrochemical reactor and convert the carbon dioxide into a third product.

Description

Technical Field

[0001] This application relates to the field of carbon dioxide conversion technology, and more particularly to a carbon dioxide conversion system. Background Technology

[0002] In the current context of addressing global climate change and energy transition, the effective conversion and utilization of carbon dioxide is becoming increasingly important. Traditional carbon dioxide conversion typically employs technologies such as chemical methods, adsorption methods, and membrane methods to separate and capture carbon dioxide from flue gas in coal-fired boilers, and then regenerates, purifies, and compresses the carbon dioxide through pressure and temperature regulation. However, these existing technologies often generate a large number of byproducts during the conversion process, and the complex chemical composition and unstable nature of these byproducts increase the difficulty of subsequent separation and treatment. Summary of the Invention

[0003] In view of this, this application proposes a carbon dioxide conversion system, comprising: a first mixing chamber, an electrochemical reactor, a first conversion unit, and a second conversion unit;

[0004] The feed end of the first mixing chamber is suitable for introducing the reactants and water; the discharge end of the first mixing chamber is connected to the feed end of the electrochemical reactor, which is configured to perform a partial water splitting reaction on water to generate hydroxide ions and hydrogen ions, and based on the generated hydroxide ions and hydrogen ions, react with the reactants to generate the first product and the second product, respectively.

[0005] The feed end of the first conversion unit is connected to the first discharge end of the electrochemical reactor and is configured to convert the first product generated by the electrochemical reactor.

[0006] The feed end of the second conversion unit is connected to the second discharge end of the electrochemical reactor and is configured to capture carbon dioxide and convert it into a third product using the second product generated by the electrochemical reactor.

[0007] In one possible implementation, the first conversion unit includes: a first transfer tank, a second mixing chamber, and a first settling tank assembly;

[0008] The first feed end of the first transfer tank is connected to the first discharge end of the electrochemical reactor. The first discharge end of the first transfer tank is connected to the first feed end of the second mixing chamber. The second feed end of the second mixing chamber is suitable for introducing the first compound. The second mixing chamber is configured to neutralize the first product and the first compound to generate a fourth product.

[0009] The discharge end of the second mixing chamber is connected to the feed end at the top of the first settling assembly; the first settling assembly is configured to separate the fourth product generated in the second mixing chamber.

[0010] In one possible implementation, a first reuse pump and a second circulation pump are also included;

[0011] The return end of the first transfer tank is connected to the outlet of the first settling tank via a first reuse pump. The first reuse pump is configured to return the fourth product separated by the first settling tank to the first transfer tank.

[0012] The second discharge end of the first transfer tank is connected to the first return end of the electrochemical reactor via a second circulation pump.

[0013] In one possible implementation, the second conversion unit includes: a second transfer tank, an aeration tower assembly, and a second settling device assembly;

[0014] The first feed end of the second transfer tank is connected to the second feed end of the electrochemical reactor; the first discharge end of the second transfer tank is connected to the first feed end of the aeration tower assembly, the second feed end of the aeration tower assembly is suitable for introducing carbon dioxide, and the aeration tower assembly is configured to react the captured carbon dioxide with the second product to produce a third product.

[0015] The first discharge end of the aeration tower assembly is connected to the feed end of the second settling unit; the second settling unit is configured to separate the third product generated by the aeration tower assembly.

[0016] In one possible implementation, a second reuse pump and a third circulation pump are also included;

[0017] The discharge end of the second settling unit is connected to the return end of the second transfer tank via a second reuse pump. The second reuse pump is configured to send the third product separated by the second settling unit back into the second transfer tank.

[0018] The second discharge end of the second transfer tank is connected to the second return end of the electrochemical reactor via the third circulation pump.

[0019] In one possible implementation, the electrochemical reactor includes: an anode plate, a cathode plate, an anion exchange membrane, a cation exchange membrane, a first half-water splitting unit, and a second half-water splitting unit;

[0020] The first and second half-water splitting units are arranged opposite to each other, and the anion exchange membrane and the cation exchange membrane are arranged between the two half-water splitting units.

[0021] The anode plate is located on the side of the first half-water splitting unit away from the anion exchange membrane, and the cathode plate is located on the side of the second half-water splitting unit away from the cation exchange membrane.

[0022] In one possible implementation, both the first half-water splitting unit and the second half-water splitting unit include: a cathode membrane, a catalytic anode, and an insulating membrane;

[0023] The cathode membrane and the insulating membrane are arranged opposite to each other, and the catalytic anode is arranged between the cathode membrane and the insulating membrane, with the cathode membrane attached to the side of the catalytic anode away from the insulating membrane;

[0024] The catalytic anode is connected to the anode of the second power source.

[0025] In one possible implementation, both the first half-water splitting unit and the second half-water splitting unit further include: an anode membrane and a catalytic cathode;

[0026] The anode membrane is positioned on the side of the insulating diaphragm opposite to the cathode membrane.

[0027] The catalytic cathode is disposed between the anode membrane and the insulating membrane, and the anode membrane is attached to the side of the catalytic cathode away from the insulating membrane;

[0028] The catalytic cathode is connected to the cathode of the second power source.

[0029] Beneficial effects of this application

[0030] Compared to existing conversion methods, the electrochemical reactor partially hydrolyzes water to generate hydroxide and hydrogen ions. The hydroxide ions react with the reactants to produce hydroxides, which then react with the carbon dioxide gas to be treated to produce carbonates and water. The obtained water can be directly discharged to the outside environment, and the generated carbonates can be directly applied to other industries or technologies. This carbon dioxide conversion system effectively captures carbon dioxide and converts it and the reactants into a third product, realizing the resource utilization of carbon dioxide, reducing carbon dioxide emissions. The converted third product can be directly applied to other industries or technologies, bringing economic benefits to enterprises and improving resource utilization. Simultaneously, the first conversion unit converts the first product generated by the electrochemical reactor, effectively avoiding the large amount of complex and difficult-to-treat byproducts produced during the carbon dioxide conversion process in traditional technologies. This greatly simplifies the subsequent separation and treatment process, reducing processing difficulty and costs. This application does not produce any toxic or harmful byproducts during the carbon dioxide conversion process, achieving carbon dioxide emission reduction and generating positive benefits, promoting enterprises' enthusiasm for emission reduction, and effectively responding to the national "dual carbon" target.

[0031] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0032] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0033] Figure 1A flowchart of the carbon dioxide conversion system of this application is shown;

[0034] Figure 2 A reaction flow diagram of one embodiment of the electrochemical reactor of this application is shown;

[0035] Figure 3 The main structural diagram of the semi-hydrolysis unit of this application is shown;

[0036] Figure 4 The main structural diagram of the electrochemical reactor of this application is shown. Detailed Implementation

[0037] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0038] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0041] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0042] This application proposes a carbon dioxide conversion system, comprising: a first mixing chamber, an electrochemical reactor 200, a first conversion unit, and a second conversion unit; the feed end of the first mixing chamber is adapted to introduce reactants and water; the discharge end of the first mixing chamber is connected to the feed end of the electrochemical reactor 200, the electrochemical reactor 200 is configured to perform a partial water splitting reaction on water to generate hydroxide ions and hydrogen ions, and based on the generated hydroxide ions and hydrogen ions, react with the reactants to generate a first product and a second product, respectively; the feed end of the first conversion unit is connected to the first discharge end of the electrochemical reactor 200, and is configured to convert the first product generated by the electrochemical reactor 200; the feed end of the second conversion unit is connected to the second discharge end of the electrochemical reactor 200, and is configured to use the second product generated by the electrochemical reactor 200 to capture carbon dioxide and convert it into a third product.

[0043] It should be noted that this application is applicable to the conversion of carbon dioxide and reactants into a third product. The feed end of the electrochemical reactor 200 is connected to the first mixing chamber, which is used to provide a uniform mixture for the subsequent electrochemical reactor 200. After the first mixing chamber mixes and dilutes the reactants with water to form a mixture, it transports the mixture into the electrochemical reactor 200. The electrochemical reactor 200 is used to decompose and convert the mixture. The electrochemical reactor 200 performs a partial water splitting reaction on water to generate hydroxide ions and hydrogen ions. Based on the generated hydroxide ions and hydrogen ions, they undergo a complex decomposition reaction with the reactants to generate the first product and the second product, thereby providing conversion raw materials for the subsequent first conversion unit and second conversion unit.

[0044] The first conversion unit converts the first product generated by the electrochemical reactor 200, avoiding the emission of harmful substances from the carbon dioxide conversion system of this application and reducing environmental pollution caused by the emission of harmful substances. The second conversion unit uses the second product generated by the electrochemical reactor 200 to capture carbon dioxide and convert it into a third product. The generated third product can be directly applied to other industries or technologies. The design of the second conversion unit provides an effective way for the fixation and conversion of carbon dioxide, reducing carbon dioxide emissions. This application does not produce any toxic or harmful side reaction substances during the carbon dioxide gas conversion process, achieving carbon dioxide emission reduction and generating positive benefits, promoting the enthusiasm of enterprises for emission reduction, and effectively responding to the national "dual carbon" target.

[0045] Compared with existing conversion methods, the electrochemical reactor 200 performs partial hydrolysis of water to generate hydroxide ions and hydrogen ions. Based on the reaction of hydroxide ions with the reactants, hydroxide is generated. Then, based on the generated hydroxide, carbon dioxide gas to be treated reacts to generate carbonate and water. The obtained water can be directly discharged to the outside, and the generated carbonate can be directly applied to other industries or technologies. The carbon dioxide conversion system of this application can effectively capture carbon dioxide and convert carbon dioxide and reactants into a third product, realizing the resource utilization of carbon dioxide, reducing carbon dioxide emissions, and the converted third product can be directly applied to other industries or technologies, bringing economic benefits to enterprises and improving resource utilization. At the same time, the first conversion unit converts the first product generated by the electrochemical reactor 200, effectively avoiding the generation of a large number of complex and difficult-to-treat by-products in the carbon dioxide conversion process of traditional technologies, greatly simplifying the subsequent separation and treatment process, and reducing the difficulty and cost of treatment.

[0046] Furthermore, the first mixing chamber includes a mixing tank 110, an inlet pump 120, a delivery tank 130, and a first circulation pump 140. The mixing tank 110 mixes water with the reactants. The mixing tank 110 is connected to the delivery tank 130 through the inlet pump 120, which delivers the mixture from the mixing tank 110 to the delivery tank 130. The delivery tank 130 is connected to the feed end of the electrochemical reactor 200 through the first circulation pump 140, which delivers the mixture from the delivery tank 130 to the electrochemical reactor 200.

[0047] In one possible implementation, the reactant is introduced into the feed end of the first mixing chamber and mixed with water, wherein the mixing ratio of the reactant to water is 1:7.

[0048] In one possible implementation, the reactants are soluble ionic compounds.

[0049] Preferably, the reactants are any one of the following ionic compounds: sodium sulfate, potassium sulfate, potassium chloride, and sodium chloride.

[0050] In one possible implementation, the electrochemical reactor 200 includes: an anode plate 210, a cathode plate 220, an anion exchange membrane 230, a cation exchange membrane 240, a first half-water splitting unit 310, and a second half-water splitting unit 320; the first half-water splitting unit 310 and the second half-water splitting unit 320 are arranged opposite to each other, and the anion exchange membrane 230 and the cation exchange membrane 240 are arranged between the two half-water splitting units; the anode plate 210 is arranged on the side of the second half-water splitting unit 320 away from the anion exchange membrane 230, and the cathode plate 220 is arranged on the side of the first half-water splitting unit 310 away from the cation exchange membrane 240.

[0051] It should be noted that the anode plate 210 is suitable for connection to the anode of the first power supply, and the cathode plate 220 is suitable for connection to the cathode of the first power supply. The anion membrane 230 and the cation membrane 240 divide the first half-water splitting unit 310 and the second half-water splitting unit 320 into a two-membrane, three-chamber structure. A preset distance is provided between the anion membrane 230 and the cation membrane 240 to form a first chamber 410. The first chamber 410 is suitable for introducing a mixture of the reactant and water. The preset distance between the anion membrane 230 and the cation membrane 240 is in the range of 0.1 mm to 0.3 mm. Preferably, the preset distance between the anion membrane 230 and the cation membrane 240 is 1.8 mm.

[0052] Furthermore, the anion exchange membrane 230 is made of polyarylene piperidine resin; the thickness of the anion exchange membrane 230 is 25-75 micrometers.

[0053] A preset distance is provided between the first half-water splitting unit 310 and the cation exchange membrane 240 to form a second chamber 420. The cation exchange membrane 240 is used to decompose the reactants in the mixture and collect the decomposed reactants into the second chamber 420. Water passes through the cation exchange membrane 240 into the first half-water splitting unit 310, which electrolyzes water to produce hydroxide ions and collects the hydroxide ions into the second chamber 420. At this time, the decomposed reactants in the second chamber 420 undergo an electrochemical reaction with the hydroxide ions to generate a second product. The second product can be used to absorb carbon dioxide. The generated second product is transported to the second conversion unit, which converts the second product with carbon dioxide to form a third product that can be directly applied to other industries or technologies. The preset distance between the first half-water splitting unit 310 and the cation exchange membrane 240 is in the range of 1 mm to 3 mm. Preferably, the preset distance between the first half-water splitting unit 310 and the cation exchange membrane 240 is 1.8 mm.

[0054] Furthermore, the cation membrane 240 is made of sulfonic acid polymer, and the thickness of the cation membrane 240 ranges from 25 to 75 micrometers.

[0055] A preset distance is provided between the second half-water splitting unit 320 and the anion exchange membrane 230 to form a third chamber 430. The anion exchange membrane 230 is suitable for decomposing the reactants in the mixture and collecting the decomposed reactants into the third chamber 430. Water passes through the anion exchange membrane 230 and enters the second half-water splitting unit 320. The second half-water splitting unit 320 electrolyzes water to produce hydrogen ions and collects the hydrogen ions into the third chamber 430. At this time, the decomposed reactants in the third chamber 430 undergo an electrochemical reaction with the hydrogen ions to generate a first product. The generated first product is transported to the first conversion unit, which converts the first product, thereby avoiding the generation of a large number of complex and difficult-to-handle by-product compounds during the carbon dioxide conversion process of this application. The preset distance between the second half-water splitting unit 320 and the anion exchange membrane 230 is in the range of 1mm-3mm. Preferably, the preset distance between the second half-water splitting unit 320 and the anion exchange membrane 230 is the same as the preset distance between the anion exchange membrane 230 and the cation exchange membrane 240, and the optimal value is also 1.8mm.

[0056] In one possible implementation, the voltage range of the first power supply connected to the cathode plate 220 and the anode plate 210 is 1.8V-2.5V.

[0057] Preferably, the anode plate 210 is made of titanium plated with iridium and tantalum; the cathode plate 220 is made of graphite.

[0058] In one possible implementation, the thickness of the anode plate 210 is the same as the thickness of the cathode plate 220; preferably, the thickness of both the anode plate 210 and the cathode plate 220 is 2 mm.

[0059] The distance between the cathode plate 220 and the first semi-water splitting unit 310 ranges from 1mm to 3mm; the optimal value is 1.8mm.

[0060] The distance between the anode plate 210 and the second semi-hydrolysis unit 320 ranges from 1mm to 3mm; the optimal value is 1.8mm.

[0061] In summary, the most preferred arrangement is that the distance between any two adjacent units in the sequentially arranged anode plate 210, second half-water splitting unit 320, anion membrane 230, cation membrane 240, first half-water splitting unit 310, and cathode plate 220 is the same.

[0062] It should also be noted that the anode plate 210, the second half-water splitting unit 320, the anion membrane 230, the cation membrane 240, the first half-water splitting unit 310, and the cathode plate 220 can be arranged in sequence in the electrolytic cell; and it must be ensured that the chambers between any two adjacent structures are independent spaces to avoid the phenomenon of communication between adjacent chambers.

[0063] In one possible implementation, both the first half-water splitting unit 310 and the second half-water splitting unit 320 include: a cathode membrane 311, a catalytic anode 312, and an insulating diaphragm 313; the cathode membrane 311 and the insulating diaphragm 313 are disposed opposite to each other, the catalytic anode 312 is disposed between the cathode membrane 311 and the insulating diaphragm 313, and the cathode membrane 311 is attached to the side of the catalytic anode 312 away from the insulating diaphragm 313, and the catalytic anode 312 is connected to the anode of the second power source.

[0064] It should be noted that the first half-water splitting unit 310 and the second half-water splitting unit 320 are suitable for electrolyzing water. A preset distance is provided between the insulating membrane 313 and the catalytic anode 312 to form a fourth chamber 440. Water in the electrochemical reactor 200 enters the fourth chamber 440. The catalytic anode 312 is connected to the anode of the second power supply and is suitable for providing a stable current to the catalytic anode 312. The catalytic anode 312 is suitable for reducing the activation energy of the water molecule oxidation reaction, thereby improving the efficiency of water electrolysis. The cathode membrane 311 is suitable for allowing hydroxide ions to pass through under the action of the electric field while preventing hydrogen ions from passing through, thereby achieving selective transport of hydroxide ions.

[0065] Specifically, when water enters the fourth chamber 440 of the electrochemical reactor 200 and the anode of the second power source supplies power to the catalytic anode 312, the electrolysis reaction begins. The catalytic anode 312 electrolyzes water to produce hydroxide ions. Under the action of the cathode membrane 311, the hydroxide ions can pass through the cathode membrane 311 to achieve the separation of hydroxide ions. The separated hydroxide ions are collected in the second chamber 420 of the electrochemical reactor 200 and undergo an electrochemical reaction with the decomposed reactants in the second chamber 420 to generate the second product.

[0066] Furthermore, the preset distance between the catalytic anode 312 and the insulating membrane 313 is in the range of 0.6mm to 1mm; preferably, the preset distance between the catalytic anode 312 and the insulating membrane 313 is 0.6mm.

[0067] In one possible implementation, the main body of the insulating diaphragm 313 is a rectangular sheet structure; the insulating diaphragm 313 can be made of PP or PTFE; the thickness of the insulating diaphragm 313 is 0.5 mm.

[0068] In one possible implementation, the catalytic anode 312 has a rectangular parallelepiped structure; the cathode film 311 and the catalytic anode 312 are arranged parallel to each other and opposite to each other, with a preset distance between them. Preferably, the preset distance between the cathode film 311 and the catalytic anode 312 is 1.8 mm.

[0069] In one possible implementation, the cathode film 311 is made of polyarylepiperidine resin, and the thickness of the cathode film 311 ranges from 25 to 75 micrometers.

[0070] In one possible implementation, both the first half-water splitting unit 310 and the second half-water splitting unit 320 further include: an anode membrane 314 and a catalytic cathode 315; the anode membrane 314 is disposed on the side of the insulating diaphragm 313 away from the cathode membrane 311, and the catalytic cathode 315 is disposed between the anode membrane 314 and the insulating diaphragm 313, with the anode membrane 314 attached to the side of the catalytic cathode 315 away from the insulating diaphragm 313; the catalytic cathode 315 is connected to the cathode of the second power source.

[0071] It should be noted that a preset distance is provided between the insulating membrane 313 and the catalytic cathode 315 to form a fifth chamber 450. Water in the electrochemical reactor 200 enters the fifth chamber 450. The catalytic cathode 315 is connected to the cathode of the second power source. The catalytic cathode 315 is suitable for reducing the activation energy of hydrogen ions in water molecules gaining electrons and being reduced to hydrogen gas on the catalytic cathode 315, thereby improving the electrolysis efficiency. The cathode membrane 311 is suitable for allowing hydrogen ions to pass through while preventing hydroxide ions from passing through, thereby achieving selective transport of hydrogen ions.

[0072] Specifically, when water enters the fifth chamber 450 of the electrochemical reactor 200 and the cathode of the second power source supplies power to the catalytic cathode 315, the electrolysis reaction begins. The catalytic cathode 315 electrolyzes water to produce hydrogen ions. Under the action of the anode membrane 314, the hydrogen ions can pass through the cathode membrane 311 to achieve hydrogen ion separation. The separated hydrogen ions are collected in the third chamber 430 of the electrochemical reactor 200 and undergo an electrochemical reaction with the decomposed reactants in the third chamber 430 to generate the first product.

[0073] Furthermore, the preset distance between the catalytic cathode 315 and the insulating membrane 313 is in the range of 0.6mm to 1mm; preferably, the preset distance between the catalytic cathode 315 and the insulating membrane 313 is 0.6mm.

[0074] Furthermore, the insulating membrane 313 divides the semi-hydrolysis unit into two independent electrolytic cells. The catalytic anode 312 is located in the first electrolytic cell, and the catalytic cathode 315 is located in the second electrolytic cell. The insulating membrane 313 is designed to prevent short circuits between the two electrolytic cells of the semi-hydrolysis unit. The first electrolytic cell of the first semi-hydrolysis unit 310 is located on the side close to the cation membrane 240, and the cathode membrane 311 is located between the insulating membrane 313 and the cation membrane 240. The second electrolytic cell of the second semi-hydrolysis unit 320 is located on the side close to the anion membrane 230, and the anode membrane 314 is located between the insulating membrane 313 and the anion membrane 230.

[0075] Furthermore, the voltage range of the second power source is 0.35–0.65V. This ensures that water is partially decomposed into hydrogen ions and hydroxide ions, without electrolyzing out oxygen and hydrogen gas.

[0076] In one possible implementation, the main body of the catalytic cathode 315 has a cuboid structure, and the anode film 314 and the catalytic cathode 315 are arranged parallel to each other and opposite to each other, with a preset distance between the anode film 314 and the catalytic cathode 315. Preferably, the preset distance between the anode film 314 and the catalytic cathode 315 is 1.8 mm.

[0077] Furthermore, the anode film 314 is made of sulfonic acid polymer; the thickness of the anode film 314 ranges from 25 to 75 micrometers.

[0078] In one possible implementation, a catalyst layer is attached to the surface of the catalytic anode 312; a catalyst layer is also attached to the surface of the catalytic cathode 315. The catalyst layers on the catalytic anode 312 and catalytic cathode 315 serve to promote the dissociation of water molecules under the influence of an electric field. The catalyst layer is made of a non-precious metal, preferably a non-precious metal such as nickel, cobalt, or iron. The thickness of the catalyst layer ranges from 0.5 to 1 micrometer. The catalyst layer is attached to the catalytic anode 312 and catalytic cathode 315 by electrodeposition.

[0079] In one possible implementation, the first conversion unit includes: a first transfer tank 510, a second mixing chamber 520, and a first settling assembly 530; a first feed end of the first transfer tank 510 is connected to a first discharge end of the electrochemical reactor 200, the first discharge end of the first transfer tank 510 is connected to a first feed end of the second mixing chamber 520, a second feed end of the second mixing chamber 520 is adapted to introduce a first compound, the second mixing chamber 520 is configured to neutralize the first product and the first compound to generate a fourth product; the discharge end of the second mixing chamber 520 is connected to a feed end at the top of the first settling assembly 530; the first settling assembly 530 is configured to separate the fourth product generated in the second mixing chamber 520.

[0080] It should be noted that the first transfer tank 510 is suitable for receiving the first product output from the electrochemical reactor 200. By setting up the first transfer tank 510, the first product is temporarily stored, ensuring the stability and continuity of subsequent processing steps. The first transfer tank 510 transports the first product to the second mixing chamber 520 through the first outlet pump 511. The second mixing chamber 520 introduces the first compound into the second mixing chamber 520 to neutralize with the first product. The resulting fourth product is then transported to the first settling device assembly 530. The first settling device separates the fourth product generated in the second mixing chamber 520. By performing neutralization reaction and sedimentation separation in the first conversion unit, the subsequent separate separation and processing of the first product is greatly simplified, reducing the processing difficulty and cost, realizing the recycling and reuse of the first product, and improving resource utilization efficiency.

[0081] In one possible implementation, the first compound is a basic compound.

[0082] Preferably, the first compound is any one of the following alkaline compounds: calcium hydroxide, barium hydroxide, lead hydroxide, and strontium hydroxide.

[0083] In one possible implementation, a first reuse pump 540 and a second circulation pump 550 are also included; the return end of the first transfer tank 510 is connected to the outlet of the first settling assembly 530 via the first reuse pump 540, the first reuse pump 540 is configured to send the fourth product separated by the first settling assembly 530 back into the first transfer tank 510, and the second outlet of the first transfer tank 510 is connected to the first return end of the electrochemical reactor 200 via the second circulation pump 550.

[0084] It should be noted that the separation operation of the first settling tank assembly 530 is for the separation of the fourth product. The first reuse pump 540 is used to send the fourth product separated by the first settling tank assembly 530 back to the first transfer tank 510, so that the fourth product can be recycled. This recycling method improves the utilization rate of the fourth product and reduces production costs. The second circulation pump 550 is used to send the fourth product in the first transfer tank 510 back to the electrochemical reactor 200, so that the fourth product containing impurities can be reacted again, thereby improving the utilization efficiency of materials.

[0085] In one possible implementation, the second conversion unit includes: a second transfer tank 610, an aeration tower assembly, and a second settling assembly 630; a first feed end of the second transfer tank 610 is connected to a second feed end of the electrochemical reactor 200; a first discharge end of the second transfer tank 610 is connected to a first feed end of the aeration tower assembly, the second feed end of which is adapted to introduce carbon dioxide, the aeration tower assembly being configured to react the captured carbon dioxide with a second product to produce a third product; a first discharge end of the aeration tower assembly is connected to the feed end of the second settling assembly 630; and the second settling assembly 630 is configured to separate the third product produced by the aeration tower assembly.

[0086] It should be noted that the second transfer tank 610 is suitable for receiving the second product output from the electrochemical reactor 200. The second transfer tank 610 transports the second product to the explosion tower assembly through the second outlet pump 611. The explosion tower assembly captures carbon dioxide from the outside and introduces it into the explosion tower assembly. The captured carbon dioxide reacts with the second product in the explosion tower assembly to generate a third product. The second settler separates the third product generated by the reaction in the explosion tower assembly. The second settler assembly 630 uses the principle of gravity settling to achieve effective separation of the third product, thereby improving the purity and quality of the third product.

[0087] In one possible implementation, the aeration tower assembly includes: an aeration tower 621, a pressure equalization tank 622, a gas booster pump 623, and a pressure buffer tank 624; the first inlet of the aeration tower 621 is connected to the first outlet of the second transfer tank 610, the second outlet of the aeration tower 621 is connected to the inlet of the pressure equalization tank 622, the outlet of the pressure equalization tank 622 is connected to the inlet of the pressure buffer tank 624 via the gas booster pump 623, and the outlet of the pressure buffer tank 624 is connected to the second inlet of the aeration tower 621; the first outlet of the aeration tower 621 is connected to the inlet of the second settling tank assembly 630.

[0088] It should be noted that after capturing external carbon dioxide, the aeration tower 621 enters the tower through the second inlet. The carbon dioxide reacts with the second product inside the tower 621 to generate a third product. The design of the aeration tower 621 ensures thorough mixing and reaction of the carbon dioxide and the second product, improving reaction efficiency. The pressure equalization tank 622 is used to balance the pressure of the discharge from the aeration tower 621. Through its volume and internal structure, the pressure equalization tank 622 stabilizes the pressure of the carbon dioxide and the second product inside the aeration tower 621. The gas booster pump 623 is used to pressurize the carbon dioxide and the second product inside the aeration tower 621. Appropriate pressure helps the carbon dioxide dissolve better in the second product, thereby improving the generation efficiency of the third product. The pressure buffer tank 624 is used to absorb pressure fluctuations caused by the working characteristics of the gas booster pump 623, making the pressure of the carbon dioxide and the second product entering the aeration tower more stable, ensuring the stability of the aeration process of carbon dioxide and the second product, and improving reaction quality.

[0089] In one possible implementation, a second reuse pump 640 and a third circulation pump 650 are also included; the discharge end of the second settler assembly 630 is connected to the return end of the second transfer tank 610 via the second reuse pump 640, and the second reuse pump 640 is configured to send the third product separated from the second settler assembly 630 back into the second transfer tank 610; the second discharge end of the second transfer tank 610 is connected to the second return end of the electrochemical reactor 200 via the third circulation pump 650.

[0090] It should be noted that the second reuse pump 640 is used to return the third product separated by the second settler assembly 630 to the second transfer tank 610. By returning the third product to the second transfer tank 610, the carbon dioxide conversion system of this application can reuse the useful components in the third product, reduce the waste of raw materials, improve the utilization rate, and reduce production costs. The third circulation pump 650 is used to return the third product containing impurities in the second transfer tank 610 to the electrochemical reactor 200, so that the third product containing impurities can be reacted again, thereby improving the conversion rate of the system. By setting the third circulation pump 650, the carbon dioxide conversion system of this application can make fuller use of the incompletely converted third product for secondary reaction, reduce the emission of unreacted substances, and improve the economic and environmental benefits of the entire system.

[0091] In one possible implementation, a cooling component is also included. This cooling component is suitable for cooling the electrochemical reactor 200 and can control the temperature within the optimal activity temperature range. Suitable temperature conditions can accelerate the reaction rate of the reactants, thereby improving the production efficiency of the electrochemical reactor 200. The cooling component includes a cooler 710, a cooling pump 720, and a cooling water tank 730. The outlet of the cooling water tank 730 is connected to the input of the cooling pump 720, the output of the cooling pump 720 is connected to the input of the cooler 710, the output of the cooler 710 is connected to the cooling medium input of the electrochemical reactor 200, and the cooling medium output of the electrochemical reactor 200 is connected to the return port of the cooling water tank 730.

[0092] According to another aspect of the application, a carbon dioxide conversion method is provided, which uses the aforementioned carbon dioxide conversion system to convert carbon dioxide. The reactants and water are introduced into a first mixing chamber and stirred and mixed within the chamber. The mixed reactants and water are then transported to an electrochemical reactor 200, where the reactor performs a partial water splitting reaction to generate hydroxide ions and hydrogen ions. Based on the generated hydroxide ions and hydrogen ions, these react with the reactants to generate a first product and a second product, respectively. The second product generated by the electrochemical reactor 200 is then transported to a second conversion unit, where the second conversion unit uses the second product from the electrochemical reactor 200 to capture carbon dioxide and convert it into a third product. Finally, the first product generated by the electrochemical reactor 200 is transported to a first conversion unit, where the first conversion unit converts the first product generated by the electrochemical reactor 200.

[0093] Example 1: When the reactant is sodium sulfate:

[0094] After the sodium sulfate solution is mixed and diluted with water in the first mixing chamber to form a mixed solution, the first mixing chamber transports the mixed solution to the first chamber 410 of the electrochemical reactor 200. The anion exchange membrane 230 can separate the negatively charged sulfate ions in the sodium sulfate solution and collect them in the third chamber 430. Since the catalytic cathode 315 of the second half-water splitting unit 320 faces the anion exchange membrane 230, when water enters the fifth chamber 450 of the second half-water splitting unit 320, the second half-water splitting unit 320 will electrolyze the water to produce positively charged hydrogen ions. The cathode membrane 311 will precipitate the hydrogen ions and collect them in the third chamber 430 of the electrochemical reactor 200. At this time, the third chamber 430 contains hydrogen ions from water electrolysis and sulfate ions from sodium sulfate decomposition. The hydrogen ions can then undergo a metathesis reaction with the sulfate ions to form sulfuric acid.

[0095] The cation exchange membrane 240 can decompose sodium ions from sodium sulfate and collect them in the second chamber 420. Since the catalytic anode 312 of the first half-water splitting unit faces the cation exchange membrane 240, when water enters the fourth chamber 440 of the first half-water splitting unit 310, the first half-water splitting unit 310 electrolyzes hydroxide ions, which are then deposited by the anode membrane 314 and collected in the second chamber 420. At this point, the second chamber 420 contains hydroxide ions from the water half-dissociation and sodium ions from the decomposition of sodium sulfate. The hydroxide ions and sodium ions then undergo a double displacement reaction to form sodium hydroxide. It should be noted that the purity of the sodium hydroxide obtained at this time is higher than 98%.

[0096] The reaction equation for Example 1 is as follows: Na2SO4 + 2H2O → H2SO4 + 2NaOH.

[0097] In summary, the electrochemical reactor 200 can perform a metathesis reaction between water and sodium sulfate to obtain sulfuric acid and sodium hydroxide. Both the newly formed sulfuric acid and sodium hydroxide are common chemical substances. The sodium hydroxide generated by the metathesis reaction in Example 1 of this application can be used in the second conversion unit to achieve the capture, storage, and high-value conversion of carbon dioxide. Specific applications are as follows:

[0098] The second transfer tank 610 transports the sodium hydroxide generated by the electrochemical reactor 200 to the aeration tower assembly. The aeration tower assembly captures external carbon dioxide and introduces it into the aeration tower assembly. The captured carbon dioxide reacts with the sodium hydroxide in the aeration tower assembly to generate sodium bicarbonate. The second settling device separates the sodium bicarbonate generated by the reaction in the aeration tower assembly. Since sodium bicarbonate exists in both solid and liquid forms after the reaction, the second settling device assembly 630 uses the principle of gravity settling to precipitate the sodium bicarbonate, thereby achieving effective separation of the solid and liquid sodium bicarbonate and improving the purity and quality of sodium bicarbonate.

[0099] The reaction equation 2 is as follows: 2NaOH + 2CO₂ = 2Na₂CO₃. It should be noted that the purity of the sodium bicarbonate obtained in this reaction is higher than 99.5%.

[0100] Furthermore, it also includes a second reuse pump 640 and a third circulation pump 650. The second reuse pump 640 returns the liquid sodium bicarbonate separated from the second settler assembly 630 to the second transfer tank 610. By returning the liquid sodium bicarbonate to the second transfer tank 610, the carbon dioxide conversion system of this application can reuse the useful components in the liquid sodium bicarbonate, reduce raw material waste, improve utilization rate, and reduce production costs. The third circulation pump 650 returns the sodium hydroxide containing impurities and the liquid sodium bicarbonate in the second transfer tank 610 to the electrochemical reactor 200, thereby allowing the sodium hydroxide containing impurities and the liquid sodium bicarbonate to react again, improving the system's conversion rate. At the same time, the carbon dioxide conversion system of this application can more fully utilize the incompletely converted raw materials for secondary reactions, reduce the emission of unreacted substances, and improve the economic and environmental benefits of the entire system.

[0101] Furthermore, the sulfuric acid generated by the metathesis reaction in Example 1 of this application can be converted through the first conversion unit. When the reactant is sodium sulfate, the corresponding first compound can be calcium hydroxide; the specific application is as follows:

[0102] The first transfer tank 510 transports the sulfuric acid generated by the electrochemical reactor 200 to the second mixing chamber 520. The second mixing chamber 520 introduces calcium hydroxide, which undergoes an acid-base neutralization reaction with the sulfuric acid to generate calcium sulfate and water. The separated calcium sulfate and water are then transported to the first settling assembly. Since calcium sulfate is a precipitate and water is a liquid, the first settling assembly uses gravity settling to separate the generated calcium sulfate and water. After precipitation, the calcium sulfate is discharged from the bottom of the first settling assembly 530, while the upper layer of water is discharged from one side of the first settling assembly 530. The first conversion unit converts corrosive sulfuric acid into relatively easier-to-treat and more usable calcium sulfate and clean water by neutralizing sulfuric acid and calcium hydroxide in the second mixing chamber 520. Calcium sulfate can be used in various applications such as building materials and industrial fillers, while the water can be directly discharged into the natural environment without secondary treatment.

[0103] The reaction equation 3 is as follows: H2SO4 + Ca(OH)2 = CaSO4 + 2H2O.

[0104] In one possible implementation, the carbon dioxide conversion system of this application is equipped with a first reuse pump 540 and a second circulation pump 550. The first reuse pump 540 returns the water separated from the first settling tank 530 to the first transfer tank 510, allowing the water to be recycled in this part of the system. This water recycling method can reduce the dependence of the entire system on external fresh water, improve the utilization rate of water resources, and reduce production costs. The second circulation pump 550 returns the water in the first transfer tank 510 and sulfuric acid containing impurities to the electrochemical reactor 200, thereby allowing the sulfuric acid containing impurities to react again, improving the utilization efficiency of materials.

[0105] By applying the carbon dioxide conversion system of this application, carbon dioxide can be converted into sodium bicarbonate, which has high economic value and a large market capacity. This successfully and effectively utilizes carbon dioxide, converting it into a profitable chemical product to respond to the national dual-carbon goals and carry out carbon capture, utilization, and storage. It can also be applied to the value-added conversion and utilization of sodium sulfate solid waste. The water obtained from the carbon dioxide conversion can be directly discharged into the environment. The obtained calcium sulfate, as an inorganic compound, can be used in the construction, papermaking, and chemical industries. The obtained sodium bicarbonate, commonly known as baking soda, is an inorganic compound that can be used in the pharmaceutical industry, food processing, fire-fighting equipment, and other fields. This achieves zero carbon dioxide emissions.

[0106] Example 2: When the reactant is potassium sulfate:

[0107] After the potassium sulfate solution is mixed and diluted with water in the first mixing chamber to form a mixed solution, the first mixing chamber transports the mixed solution to the first chamber 410 of the electrochemical reactor 200. The anion exchange membrane 230 can separate sulfate ions from the potassium sulfate and collect them in the third chamber 430. Since the catalytic cathode 315 of the second half-water splitting unit 320 faces the anion exchange membrane 230, when water enters the fifth chamber 450 of the second half-water splitting unit 320, the second half-water splitting unit 320 will electrolyze the water to produce positively charged hydrogen ions. The cathode membrane 311 will precipitate the hydrogen ions and collect them in the third chamber 430 of the electrochemical reactor 200. At this time, the third chamber 430 contains hydrogen ions from water electrolysis and sulfate ions from potassium sulfate decomposition. The hydrogen ions can then undergo a metathesis reaction with the sulfate ions to form sulfuric acid.

[0108] The cation exchange membrane 240 can decompose potassium ions from potassium sulfate and collect them in the second chamber 420. The first half-water electrolysis unit 310 will electrolyze hydroxide ions from water, and the anolyte membrane 314 will precipitate and collect the hydroxide ions in the second chamber 420. At this time, the second chamber 420 contains hydroxide ions from water half-dissociation and potassium ions from potassium sulfate decomposition. The hydroxide ions can then react with the potassium ions to form potassium hydroxide.

[0109] In summary, both the newly formed sulfuric acid and potassium hydroxide are common chemical substances. The potassium hydroxide generated by the metathesis reaction in Example 2 of this application can be used in the second conversion unit to capture, store, and convert carbon dioxide to higher values. Specific applications are as follows:

[0110] The second transfer tank 610 transports the potassium hydroxide generated by the electrochemical reactor 200 to the aeration tower assembly. The aeration tower assembly captures external carbon dioxide and introduces it into the aeration tower assembly. The captured carbon dioxide reacts with the potassium hydroxide in the aeration tower assembly to produce potassium carbonate and water. The second settling tank separates the potassium carbonate and water generated by the reaction in the aeration tower assembly, thereby achieving effective separation of potassium carbonate and water.

[0111] The reaction equation 4 is as follows: 2KOH + CO2 = K2CO3 + H2O.

[0112] Furthermore, the sulfuric acid generated by the metathesis reaction in Example 2 of this application can be converted by the first conversion unit. The specific steps of the first conversion unit for converting sulfuric acid have been described in detail in Example 1 above, and will not be repeated here.

[0113] The potassium hydroxide obtained by applying the electrochemical reactor 200 of this application can convert carbon dioxide into potassium carbonate, which has high economic value. As an inorganic compound, it can be used in the production of soap, glassware, and desiccants. The water obtained from the conversion of carbon dioxide can be directly discharged into the environment.

[0114] Example 3: When the reactant is potassium chloride:

[0115] After the potassium chloride solution is mixed and diluted with water in the first mixing chamber to form a mixture, the mixture is transported to the first chamber 410 of the electrochemical reactor 200. The anion exchange membrane 230 can separate chloride ions from the potassium chloride and collect them in the third chamber 430. Since the catalytic cathode 315 of the second half-water splitting unit 320 faces the anion exchange membrane 230, when water enters the fifth chamber 450 of the second half-water splitting unit 320, the second half-water splitting unit 320 will electrolyze the water to produce positively charged hydrogen ions. The cathode membrane 311 will precipitate the hydrogen ions and collect them in the third chamber 430 of the electrochemical reactor 200. At this time, the third chamber 430 contains hydrogen ions from water electrolysis and chloride ions from potassium chloride decomposition. The hydrogen ions can then undergo a metathesis reaction with the chloride ions to form hydrogen chloride. Hydrogen chloride can be used to manufacture corrosion inhibitors, dyes, fragrances, pharmaceuticals, and various chlorides.

[0116] The cation exchange membrane 240 can decompose potassium ions from potassium chloride and collect them in the second chamber 420. The first half-water electrolysis unit 310 will electrolyze hydroxide ions from water, and the anolyte membrane 314 will precipitate and collect the hydroxide ions in the second chamber 420. At this time, the second chamber 420 contains hydroxide ions from water half-dissociation and potassium ions from potassium chloride decomposition. The hydroxide ions can then react with the potassium ions to form potassium hydroxide.

[0117] In summary, both the newly formed potassium chloride and potassium hydroxide are common chemical substances. The potassium hydroxide generated by the reaction in Example 3 of this application can be used to capture, store, and convert carbon dioxide to higher values ​​through the second conversion unit. The specific steps for converting potassium hydroxide in the second conversion unit have been described in detail in Example 2 above and will not be repeated here.

[0118] Example 4: When the reactant is sodium chloride:

[0119] After the first mixing chamber mixes and dilutes sodium chloride with water to form a mixture, the mixture is transported to the first chamber 410 of the electrochemical reactor 200. The anion exchange membrane 230 separates chloride ions from the sodium chloride and collects them in the third chamber 430. Since the catalytic cathode 315 of the second half-water splitting unit 320 faces the anion exchange membrane 230, when water enters the fifth chamber 450 of the second half-water splitting unit 320, the second half-water splitting unit 320 electrolyzes positively charged hydrogen ions from the water. The cathode membrane 311 deposits the hydrogen ions and collects them in the third chamber 430 of the electrochemical reactor 200. At this time, the third chamber 430 contains hydrogen ions from water electrolysis and chloride ions from sodium chloride decomposition. The hydrogen ions can then undergo a metathesis reaction with the chloride ions to generate hydrogen chloride. Hydrogen chloride can be directly applied to other industries or technologies.

[0120] The cation exchange membrane 240 can decompose sodium ions from sodium chloride and collect them in the second chamber 420. The first half-water electrolysis unit 310 will electrolyze hydroxide ions from water, and the anolyte membrane 314 will precipitate and collect the hydroxide ions in the second chamber 420. At this time, the second chamber 420 contains hydroxide ions from water half-dissociation and sodium ions from sodium chloride decomposition. The hydroxide ions can react with the sodium ions to form sodium hydroxide.

[0121] In summary, the newly formed substances, hydrogen chloride and sodium hydroxide, are both common chemical substances. The sodium hydroxide generated by the reaction in Example 4 of this application can be used to capture, store, and convert carbon dioxide to higher values ​​through the second conversion unit. The specific steps for converting sodium hydroxide in the second conversion unit have been described in detail in Example 1 above and will not be repeated here.

[0122] The carbon dioxide conversion system of this application has the following beneficial effects:

[0123] 1. The innovative combination of electrocatalytic electrolysis technology enables the low-power conversion of sodium sulfate and carbon dioxide into sodium bicarbonate, making it competitive with traditional sodium bicarbonate products on the market (potentially replacing sodium carbonate and sodium bicarbonate produced from traditional natural alkali mines).

[0124] 2. It can solve the urgent market problem of achieving positive returns from carbon dioxide emission reduction, thus promoting enterprises' enthusiasm for emission reduction; and effectively responds to the national "dual carbon" target.

[0125] 3. It can be applied to the value-added conversion and utilization of sodium sulfate solid waste; it can realize the conversion of salt anions and cations (for example, potassium chloride can be converted into potassium hydroxide and hydrochloric acid through a semi-hydrolysis unit).

[0126] 4. The reaction conditions are mild, with the initial reaction temperature ranging from 20 to 30°C, which can meet the needs of wind and solar power. All raw materials and auxiliary materials are sourced domestically and prepared independently, eliminating supply chain dependence. The overall process does not require high temperature, high pressure, or high-grade heat sources, saving energy consumption in the evaporation process and improving the safety and reliability of the production process. The overall process flow meets the requirements of the overall coal gasification cycle. The technical route aligns with the national dual-carbon goals and the development concept of a circular economy.

[0127] 5. Adding a solid electrolyte layer (SSE) between the anion exchange membrane 800 and the cation exchange membrane 900 can create a battery voltage of 0.8V. (SSE is a solid ionic conductor and electronic insulating material, a characteristic component of solid-state batteries.) Rinsing and circulating it with deionized water improves the ionic conductivity and stability of the SSE, thereby increasing the energy efficiency of the electrolyzer and reducing overall power consumption.

[0128] 6. The sodium carbonate or sodium bicarbonate obtained from carbon capture can be further dissociated from CO2 through a partial water splitting unit.

[0129] 7. Low cost; lower than the cost of traditional sodium bicarbonate production on the market; while some traditional methods of carbon dioxide treatment are more expensive (for example, the cost of producing green methanol from carbon dioxide and hydrogen is more than twice the cost of traditional methanol production, and the cost of producing protein from carbon dioxide by electrocatalysis is tens of thousands of times the cost of protein production by ordinary methods). Compared with these traditional methods of carbon dioxide treatment, this application has a simpler process and lower cost.

[0130] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A carbon dioxide conversion system, characterized in that, include: The system comprises a first mixing chamber, an electrochemical reactor, a first conversion unit, and a second conversion unit. The feed end of the first mixing chamber is suitable for introducing the reactants and water; The discharge end of the first mixing chamber is connected to the feed end of the electrochemical reactor. The electrochemical reactor is configured to perform a partial water splitting reaction on water to generate hydroxide ions and hydrogen ions, and based on the generated hydroxide ions and hydrogen ions, react with the reactants to generate a first product and a second product, respectively. The feed end of the first conversion unit is connected to the first discharge end of the electrochemical reactor and is configured to convert the first product generated by the electrochemical reactor. The feed end of the second conversion unit is connected to the second discharge end of the electrochemical reactor and is configured to capture carbon dioxide and convert it into a third product using the second product generated by the electrochemical reactor.

2. The carbon dioxide conversion system according to claim 1, characterized in that, The first conversion unit includes: a first transfer tank, a second mixing chamber, and a first settling device assembly; The first feed end of the first transfer tank is connected to the first discharge end of the electrochemical reactor, and the first discharge end of the first transfer tank is connected to the first feed end of the second mixing chamber. The second feed end of the second mixing chamber is adapted to introduce the first compound. The second mixing chamber is configured to neutralize the first product and the first compound to generate a fourth product. The discharge end of the second mixing chamber is connected to the feed end at the top of the first settling assembly; the first settling assembly is configured to separate the fourth product generated in the second mixing chamber.

3. The carbon dioxide conversion system according to claim 2, characterized in that, It also includes a first reuse pump and a second circulation pump; The return end of the first transfer tank is connected to the outlet of the first settling tank via the first reuse pump. The first reuse pump is configured to return the fourth product separated by the first settling tank to the first transfer tank. The second discharge end of the first transfer tank is connected to the first return end of the electrochemical reactor via the second circulation pump.

4. The carbon dioxide conversion system according to claim 1, characterized in that, The second conversion unit includes: a second transfer tank, an aeration tower assembly, and a second settling device assembly; The first feed end of the second transfer tank is connected to the second feed end of the electrochemical reactor; the first discharge end of the second transfer tank is connected to the first feed end of the aeration tower assembly, the second feed end of the aeration tower assembly is adapted to introduce carbon dioxide, and the aeration tower assembly is configured to react the captured carbon dioxide with the second product to produce a third product. The first discharge end of the aeration tower assembly is connected to the feed end of the second settling device assembly; the second settling device assembly is configured to separate the third product generated by the aeration tower assembly.

5. The carbon dioxide conversion system according to claim 4, characterized in that, It also includes a second reuse pump and a third circulation pump; The discharge end of the second settling device assembly is connected to the return end of the second transfer tank via the second reuse pump. The second reuse pump is configured to send the third product separated by the second settling device assembly back into the second transfer tank. The second discharge end of the second transfer tank is connected to the second return end of the electrochemical reactor via the third circulation pump.

6. The carbon dioxide conversion system according to claim 1, characterized in that, The electrochemical reactor includes: an anode plate, a cathode plate, an anion exchange membrane, a cation exchange membrane, a first half-water splitting unit, and a second half-water splitting unit; The first and second half-water splitting units are arranged opposite to each other, and the anion exchange membrane and the cation exchange membrane are disposed between the two half-water splitting units; The anode plate is disposed on the side of the first half-water splitting unit away from the anion exchange membrane, and the cathode plate is disposed on the side of the second half-water splitting unit away from the cation exchange membrane.

7. The carbon dioxide conversion system according to claim 6, characterized in that, Both the first and second half-water splitting units include: a cathode membrane, a catalytic anode, and an insulating diaphragm; The cathode membrane and the insulating membrane are disposed opposite to each other, the catalytic anode is disposed between the cathode membrane and the insulating membrane, and the cathode membrane is attached to the side of the catalytic anode away from the insulating membrane; The catalytic anode is connected to the anode of the second power source.

8. The carbon dioxide conversion system according to claim 7, characterized in that, Both the first and second half-water splitting units further include: an anode membrane and a catalytic cathode; The anode membrane is disposed on the side of the insulating diaphragm opposite to the cathode membrane. The catalytic cathode is disposed between the anode membrane and the insulating membrane, and the anode membrane is attached to the side of the catalytic cathode away from the insulating membrane; The catalytic cathode is connected to the cathode of the second power source.

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