Carbon dioxide conversion system and carbon dioxide conversion method

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 technical field of carbon dioxide conversion, and particularly to a carbon dioxide conversion system and a carbon dioxide conversion method. Background Art

[0002] In the current context of addressing global climate change and energy transformation, the effective conversion and utilization of carbon dioxide have become increasingly important; traditional carbon dioxide conversion usually adopts technologies such as chemical methods, adsorption methods, and membrane methods to separate and capture carbon dioxide in the flue gas of coal-fired boilers, and realize carbon dioxide regeneration and purification and compression through methods such as pressure and temperature adjustment; however, these existing technologies often produce a large amount of by-products during the conversion process, and due to their complex chemical composition and unstable properties, the subsequent separation and treatment are difficult. Summary of the Invention

[0003] In view of this, this application proposes a carbon dioxide conversion system, including: 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 adapted to introduce reactants to be reacted 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 electrolysis 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 be reacted to generate a first product and a second product respectively; The feed end of the first conversion unit is communicated with 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 communicated with the second discharge end of the electrochemical reactor, and is configured to capture carbon dioxide using the second product generated by the electrochemical reactor and convert it into a third product.

[0004] In a possible implementation manner, the first conversion unit includes: a first transfer tank, a second mixing chamber, and a first sedimentation assembly; The first feed end of the first transfer tank is communicated with the first discharge end of the electrochemical reactor, the first discharge end of the first transfer tank is communicated with the first feed end of the second mixing chamber, the second feed end of the second mixing chamber is adapted to introduce a first compound, and the second mixing chamber is configured to perform a neutralization reaction on the first product and the first compound to generate a fourth product; The discharge end of the second mixing chamber is communicated with the feed end at the top of the first sedimentation assembly; the first sedimentation assembly is configured to separate the fourth product generated by the second mixing chamber.

[0005] In a possible implementation manner, it further includes a first reuse pump and a second circulation pump; The return material end of the first transfer tank is communicated with the discharge port of the first settler assembly through a first recycling pump, and the first recycling pump is configured to send the fourth product separated by the first settler assembly back into the first transfer tank. The second discharge end of the first transfer tank is communicated with the first return material end of the electrochemical reactor through a second circulation pump.

[0006] In a possible implementation manner, the second conversion unit includes: a second transfer tank, an aeration tower assembly, and a second settler assembly; The first feed end of the second transfer tank is communicated with the second feed end of the electrochemical reactor; the first discharge end of the second transfer tank is communicated with the first feed end of the aeration tower assembly, and 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 generate a third product; The first discharge end of the aeration tower assembly is communicated with the feed end of the second settler assembly; the second settler assembly is configured to separate the third product generated by the aeration tower assembly.

[0007] In a possible implementation manner, a second recycling pump and a third circulation pump are further included; The discharge end of the second settler assembly is communicated with the return material end of the second transfer tank through a second recycling pump, and the second recycling pump is configured to send the third product separated by the second settler assembly back into the second transfer tank; The second discharge end of the second transfer tank is communicated with the second return material end of the electrochemical reactor through a third circulation pump.

[0008] In a possible implementation manner, the electrochemical reactor includes: an anode plate, a cathode plate, an anion membrane, a cation membrane, a first water electrolysis unit, and a second water electrolysis unit; The first water electrolysis unit and the second water electrolysis unit are arranged opposite to each other, and the anion membrane and the cation membrane are arranged between the two water electrolysis units; The anode plate is arranged on the side of the first water electrolysis unit away from the anion membrane, and the cathode plate is arranged on the side of the second water electrolysis unit away from the cation membrane.

[0009] In a possible implementation manner, both the first water electrolysis unit and the second water electrolysis unit include: a cathode membrane, a catalytic anode, and an insulating diaphragm; The cathode membrane and the insulating diaphragm are arranged opposite to each other, the catalytic anode is arranged between the cathode membrane and the insulating diaphragm, and the cathode membrane is attached to the side of the catalytic anode away from the insulating diaphragm; The catalytic anode is connected to the anode of the second power supply.

[0010] In a possible implementation manner, both the first water electrolysis unit and the second water electrolysis unit further include: an anode membrane and a catalytic cathode; The anode membrane is disposed on the side of the insulating diaphragm away from the cathode membrane. The catalytic cathode is disposed between the anode membrane and the insulating diaphragm, and the anode membrane is attached to the side of the catalytic cathode away from the insulating diaphragm. The catalytic cathode is connected to the cathode of the second power source.

[0011] According to another aspect of the application, a carbon dioxide conversion method is provided. Carbon dioxide is converted using the carbon dioxide conversion system according to any one of claims 1-8. The reactant to be treated and water are introduced into the first mixing chamber and stirred and mixed therein. The mixed reactant to be treated and water are transported into the electrochemical reactor. The electrochemical reactor performs a water splitting reaction on water to generate hydroxide ions and hydrogen ions, and based on the generated hydroxide ions and hydrogen ions, reacts with the reactant to be treated to generate a first product and a second product respectively. The second product generated by the electrochemical reactor is transported to the second conversion unit. The second conversion unit uses the second product decomposed by the electrochemical reactor to capture carbon dioxide and convert it into a third product.

[0012] In a possible implementation manner, it further includes: transporting the first product generated by the electrochemical reactor to the first conversion unit, and the first conversion unit converts the first product generated by the electrochemical reactor.

[0013] Advantages of the present application Compared with the existing conversion methods, the electrochemical reactor performs water splitting on water to generate hydroxide ions and hydrogen ions. Based on the hydroxide ions, a reaction occurs with the reactant to be treated to generate hydroxides. Then, based on the generated hydroxides, a reaction occurs with the carbon dioxide gas to be treated to generate carbonates and water. The obtained water can be directly discharged to the outside, and the generated carbonates can be directly applied to other industries or technologies. The carbon dioxide conversion system of the present application can effectively capture carbon dioxide and convert carbon dioxide and the reactant to be treated 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 rate. At the same time, the first conversion unit converts the first product generated by the electrochemical reactor, effectively avoiding a large number of complex and difficult-to-treat by-product compounds generated in the process of carbon dioxide conversion in the traditional technology, greatly simplifying the subsequent separation and treatment processes, reducing the treatment difficulty and cost. The present application does not generate any toxic and harmful side reaction substances during the carbon dioxide conversion process, realizes carbon dioxide emission reduction and generates positive benefits, and promotes the enthusiasm of enterprises for emission reduction.

[0014] According to the following detailed description of the exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present application will become clear. Description of the drawings

[0015] The drawings included in and forming a part of the specification illustrate exemplary embodiments, features, and aspects of the present application together with the specification, and are used to explain the principles of the present application.

[0016] Figure 1 A flowchart showing the carbon dioxide conversion system of the present application; Figure 2 A reaction flowchart showing one embodiment of the electrochemical reactor of the present application; Figure 3 A main structure diagram showing the water electrolysis unit of the present application; Figure 4 A main structure diagram showing the electrochemical reactor of the present application. Detailed Description of the Invention

[0017] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0018] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0019] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0020] The term "exemplary" used herein means "serving as an example, embodiment, or illustration". Any embodiment described herein as "exemplary" should not be construed as being superior to or better than other embodiments.

[0021] In addition, to better illustrate the present application, numerous specific details are given in the following specific implementation manners. Those skilled in the art should understand that the present application can also be implemented without certain specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail to highlight the gist of the present application.

[0022] The present application provides a carbon dioxide conversion system, including: 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 to be processed and water; the discharge end of the first mixing chamber is in communication with the feed end of the electrochemical reactor 200, and the electrochemical reactor 200 is configured to perform a water electrolysis 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 be processed to generate a first product and a second product respectively; the feed end of the first conversion unit is in communication with 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 in communication with the second discharge end of the electrochemical reactor 200 and is configured to capture carbon dioxide using the second product generated by the electrochemical reactor 200 and convert it into a third product.

[0023] It should be noted here that the present application is applicable to converting carbon dioxide and reactants to be processed into a third product. The feed end of the electrochemical reactor 200 is connected to the first mixing chamber. The first mixing chamber is adapted to provide a uniform mixed solution for the subsequent electrochemical reactor 200. After the first mixing chamber mixes and dilutes the reactants to be processed and water to form a mixed solution, the first mixing chamber transports the mixed solution into the electrochemical reactor 200. The electrochemical reactor 200 is adapted to decompose and convert the mixed solution. The electrochemical reactor 200 performs a water electrolysis reaction on water to generate hydroxide ions and hydrogen ions, and based on the generated hydroxide ions and hydrogen ions, respectively undergoes a complex decomposition reaction with the reactants to be processed to generate a first product and a second product, thereby providing conversion raw materials for the subsequent first conversion unit and second conversion unit.

[0024] The first conversion unit converts the first product generated by the electrochemical reactor 200, avoiding the emission of harmful substances in the carbon dioxide conversion system of the present application and reducing the pollution to the environment caused by the emission of harmful substances; the second conversion unit captures carbon dioxide using the second product generated by the electrochemical reactor 200 and converts 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 and reduces the emission of carbon dioxide; the present application does not generate any toxic or harmful side reaction substances during the carbon dioxide gas conversion process, achieving carbon dioxide emission reduction and generating positive benefits, and promoting the enthusiasm of enterprises for emission reduction.

[0025] Compared with the existing conversion methods, the electrochemical reactor 200 performs semi-hydrolysis on water to generate hydroxide ions and hydrogen ions. Based on the hydroxide ions, a reaction occurs with the reactant to be processed to generate hydroxides. Then, based on the generated hydroxides, a reaction occurs with the carbon dioxide gas to be processed to generate carbonates and water. The obtained water can be directly discharged to the outside, and the generated carbonates can be directly applied to other industries or technologies. The carbon dioxide conversion system of the present application can effectively capture carbon dioxide and convert carbon dioxide and the reactant to be processed 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 efficiency. 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-product compounds in the process of carbon dioxide conversion in the traditional technology, greatly simplifying the subsequent separation and treatment processes, and reducing the treatment difficulty and cost.

[0026] Further, the first mixing chamber includes a mixing tank 110, a liquid inlet pump 120, a delivery tank 130, and a first circulation pump 140. The mixing tank 110 mixes water with the reactant. The mixing tank 110 is connected to the delivery tank 130 through the liquid inlet pump 120. The liquid inlet pump 120 delivers the mixed liquid in 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. The circulation pump delivers the mixed liquid in the delivery tank 130 into the electrochemical reactor 200.

[0027] In a possible implementation manner, the feed end of the first mixing chamber introduces the reactant to be processed to mix with water, and the mixing ratio of the reactant to be processed to water is: 1:7.

[0028] In a possible implementation manner, the reactant to be processed is a soluble ionic compound.

[0029] Preferably, the reactant to be processed is any one of ionic compounds such as sodium sulfate, potassium sulfate, potassium chloride, and sodium chloride.

[0030] In a possible implementation manner, 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 water semi-hydrolysis unit 310, and a second water semi-hydrolysis unit 320; the first water semi-hydrolysis unit 310 and the second water semi-hydrolysis unit 320 are disposed opposite to each other, and the anion exchange membrane 230 and the cation exchange membrane 240 are disposed between the two water semi-hydrolysis units; the anode plate 210 is disposed on the side of the second water semi-hydrolysis unit 320 away from the anion exchange membrane 230, and the cathode plate 220 is disposed on the side of the first water semi-hydrolysis unit 310 away from the cation exchange membrane 240.

[0031] It should be noted here that the anode plate 210 is suitable for connecting to the anode of the first power supply, the cathode plate 220 is suitable for connecting to the cathode of the first power supply, and the anion exchange membrane 230 and the cation exchange membrane 240 divide the structure between the first water electrolysis unit 310 and the second water electrolysis unit 320 into a two-membrane and three-chamber structure. A preset distance is provided between the anion exchange membrane 230 and the cation exchange membrane 240 to form a first chamber 410. A mixture of reactants to be treated and water is suitable for being introduced into the first chamber 410. Among them, the preset distance between the anion exchange membrane 230 and the cation exchange membrane 240 ranges from 0.1 mm to 0.3 mm; preferably, the preset distance between the anion exchange membrane 230 and the cation exchange membrane 240 is 1.8 mm.

[0032] Furthermore, the material of the anion exchange membrane 230 is polyarylpipidine resin; the thickness of the anion exchange membrane 230 is 25 - 75 microns.

[0033] A preset distance is provided between the first water electrolysis unit 310 and the cation exchange membrane 240 to form a second chamber 420. The cation exchange membrane 240 is suitable for decomposing the reactants to be treated in the mixture and collecting the decomposed reactants to be treated in the second chamber 420. Water passes through the cation exchange membrane 240 and enters the first water electrolysis unit 310. The first water electrolysis unit 310 electrolyzes water to produce hydroxide ions and collects the hydroxide ions in the second chamber 420. At this time, the decomposed reactants to be treated and the hydroxide ions in the second chamber 420 undergo an electrochemical reaction 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, and the second conversion unit performs conversion based on the second product and carbon dioxide, thereby forming a third product that can be directly applied to other industries or technologies; among them, the preset distance between the first water electrolysis unit 310 and the cation exchange membrane 240 ranges from 1 mm to 3 mm; preferably, the preset distance between the first water electrolysis unit 310 and the cation exchange membrane 240 is 1.8 mm.

[0034] Furthermore, the material of the cation exchange membrane 240 is a sulfonic acid type polymer, and the thickness of the cation exchange membrane 240 ranges from 25 to 75 microns.

[0035] A preset distance is provided between the second half water electrolysis unit 320 and the anion membrane 230 to form a third chamber 430. The anion membrane 230 is suitable for decomposing the reactants to be reacted in the mixed solution and collecting the decomposed reactants to be reacted into the third chamber 430. Water passes through the anion membrane 230 and enters the second half water electrolysis unit 320. The second half water electrolysis unit 320 electrolyzes water to produce hydrogen ions and collects the hydrogen ions into the third chamber 430. At this time, the decomposed reactants to be reacted in the third chamber 430 and the hydrogen ions undergo an electrochemical reaction to generate a first product. The generated first product is transported to the first conversion unit, and the first conversion unit converts the first product, thereby avoiding a large number of complex and difficult-to-treat by-product compounds generated during the carbon dioxide conversion process of the present application. Among them, the value range of the preset distance between the second half water electrolysis unit 320 and the anion membrane 230 is: 1 mm - 3 mm. Preferably, the preset distance between the second half water electrolysis unit 320 and the anion membrane 230 is the same as the preset distance between the anion membrane 230 and the cation membrane 240, and the optimal value is also 1.8 mm.

[0036] In a possible implementation manner, the voltage range of the first power supply connected to the cathode plate 220 and the anode plate 210 is 1.8V - 2.5V.

[0037] Preferably, the material of the anode plate 210 is titanium plated with iridium tantalum; the material of the cathode plate 220 is graphite.

[0038] In a possible implementation manner, the thickness of the anode plate 210 is the same as the thickness of the cathode plate 220; preferably, the thicknesses of both the anode plate 210 and the cathode plate 220 are 2 mm.

[0039] The value range of the distance between the cathode plate 220 and the first half water electrolysis unit 310 is 1 mm - 3 mm; the optimal value is 1.8 mm.

[0040] The value range of the distance between the anode plate 210 and the second half water electrolysis unit 320 is 1 mm - 3 mm; the optimal value is 1.8 mm.

[0041] In summary, most preferably, in the anode plate 210, the second half water electrolysis unit 320, the anion membrane 230, the cation membrane 240, the first half water electrolysis unit 310, and the cathode plate 220 arranged in sequence, the distance between any two adjacent ones is the same.

[0042] It should also be noted that the anode plate 210, the second half water electrolysis unit 320, the anion membrane 230, the cation membrane 240, the first half water electrolysis 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 above are all independent spaces to avoid the phenomenon of communication between adjacent two chambers.

[0043] In a possible implementation, both the first water electrolysis unit 310 and the second water electrolysis unit 320 include: a cathode membrane 311, a catalytic anode 312, and an insulating diaphragm 313; the cathode membrane 311 is disposed opposite to the insulating diaphragm 313, 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 facing away from the insulating diaphragm 313, and the catalytic anode 312 is connected to the anode of the second power source.

[0044] It should be noted here that the first water electrolysis unit 310 and the second water electrolysis unit 320 are applicable to electrolyze water. A preset distance is provided between the insulating diaphragm 313 and the catalytic anode 312 to form a fourth chamber 440. The water in the electrochemical reactor 200 enters the fourth chamber 440. The catalytic anode 312 is connected to the anode of the second power source, which is applicable to provide a stable current for the catalytic anode 312. The catalytic anode 312 is applicable to reduce the activation energy of the water molecule oxidation reaction, improving the efficiency of water electrolysis. The cathode membrane 311 is applicable to allow hydroxide ions to pass through under the action of an electric field while preventing hydrogen ions from passing through, thereby realizing the selective transport of hydroxide ions.

[0045] Specifically, when the water in the electrochemical reactor 200 enters the fourth chamber 440 and the anode of the second power source supplies power to the catalytic anode 312, the electrolysis reaction starts. 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 reactants to be decomposed in the second chamber 420 to generate a second product.

[0046] Furthermore, the value range of the preset distance between the catalytic anode 312 and the insulating diaphragm 313 is 0.6 mm - 1 mm; preferably, the preset distance between the catalytic anode 312 and the insulating diaphragm 313 is 0.6 mm.

[0047] In a possible implementation, the main body of the insulating diaphragm 313 is in a rectangular sheet structure; the material of the insulating diaphragm 313 can be PP or PTFE; the thickness of the insulating diaphragm 313 is 0.5 mm.

[0048] In a possible implementation, the main body of the catalytic anode 312 is in a cuboid structure; the cathode membrane 311 and the catalytic anode 312 are parallel and opposite to each other, and a preset distance is provided between the cathode membrane 311 and the catalytic anode 312. Preferably, the value of the preset distance between the cathode membrane 311 and the catalytic anode 312 is 1.8 mm.

[0049] In a possible implementation, the cathode film 311 is made of polyarylpiperidine resin, and the thickness of the cathode film 311 ranges from 25 to 75 micrometers.

[0050] In one possible implementation, the first semi-water splitting unit 310 and the second semi-water splitting unit 320 also include: an anode membrane 314 and a catalytic cathode 315; the anode membrane 314 is arranged on the side of the insulating membrane 313 away from the cathode membrane 311, and the catalytic cathode 315 is arranged between the anode membrane 314 and the insulating membrane 313, and the anode membrane 314 is attached to the side of the catalytic cathode 315 away from the insulating membrane 313; the catalytic cathode 315 is connected to the cathode of the second power supply.

[0051] It should be noted here that a preset distance is provided between the insulating diaphragm 313 and the catalytic cathode 315 to form a fifth chamber 450. The water in the electrochemical reactor 200 enters the fifth chamber 450. The catalytic cathode 315 is connected to the cathode of the second power supply. The catalytic cathode 315 is suitable for reducing the activation energy of the hydrogen ions in the water molecules to obtain electrons on the catalytic cathode 315 and be reduced to hydrogen, 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 realizing the selective transmission of hydrogen ions.

[0052] Specifically, when the water in the electrochemical reactor 200 enters the fifth chamber 450 and the cathode of the second power supply supplies power to the catalytic cathode 315, the electrolysis reaction begins. The catalytic cathode 315 electrolyzes the water into hydrogen ions. Under the action of the anode membrane 314, the hydrogen ions can pass through the cathode membrane 311 to achieve the separation of the hydrogen ions. 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 a first product.

[0053] Furthermore, the preset distance between the catalytic cathode 315 and the insulating diaphragm 313 is in the range of 0.6 mm to 1 mm. Preferably, the preset distance between the catalytic cathode 315 and the insulating diaphragm 313 is 0.6 mm.

[0054] Furthermore, the insulating membrane 313 separates the semi-water splitting 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 design of the insulating membrane 313 avoids short circuiting of the two electrolytic cells of the semi-water splitting unit. The first electrolytic cell of the first semi-water splitting unit 310 is arranged on the side close to the cationic membrane 240, and the cathode membrane 311 is located between the insulating membrane 313 and the cationic membrane 240. The second electrolytic cell of the second semi-water splitting unit 320 is arranged on the side close to the anionic membrane 230, and the anode membrane 314 is located between the insulating membrane 313 and the anionic membrane 230.

[0055] Further, the voltage range of the second power supply is 0.35 - 0.65V to ensure that water is semi-dissociated into hydrogen ions and hydroxide ions, rather than electrolyzed into oxygen and hydrogen.

[0056] In a possible implementation, the main body of the catalytic cathode 315 is in a cuboid structure. The anode membrane 314 and the catalytic cathode 315 are parallel and oppositely arranged, and a preset distance is provided between the anode membrane 314 and the catalytic cathode 315. Preferably, the preset distance between the anode membrane 314 and the catalytic cathode 315 is 1.8mm.

[0057] Further, the material of the anode membrane 314 is a sulfonic acid type polymer; the thickness of the anode membrane 314 ranges from 25 to 75 microns.

[0058] In a possible implementation, a catalytic layer is attached to the surface of the catalytic anode 312; a catalytic layer is also attached to the surface of the catalytic cathode 315. The function of the catalytic layers on the catalytic anode 312 and the catalytic cathode 315 in this application is to promote the dissociation of water molecules under the action of an electric field; the material of the catalytic layer is a non-noble metal, preferably non-noble metals such as nickel, cobalt, and iron; the thickness of the catalytic layer ranges from 0.5 to 1 micron; the attachment method of the catalytic layer on the catalytic anode 312 and the catalytic cathode 315 is electro-deposition.

[0059] In a possible implementation, the first conversion unit includes: a first transfer tank 510, a second mixing chamber 520, and a first settler assembly 530; the first feed end of the first transfer tank 510 is communicated with the first discharge end of the electro-chemical reactor 200, the first discharge end of the first transfer tank 510 is communicated with the first feed end of the second mixing chamber 520, the second feed end of the second mixing chamber 520 is adapted to introduce a first compound, and the second mixing chamber 520 is configured to perform a neutralization reaction on the first product and the first compound to generate a fourth product; the discharge end of the second mixing chamber 520 is communicated with the feed end at the top of the first settler assembly 530; the first settler assembly 530 is configured to separate the fourth product generated by the second mixing chamber 520.

[0060] It should be noted here that the first transfer tank 510 is suitable for receiving the first product output by the electrochemical reactor 200. By setting up the first transfer tank 510, the temporary storage of the first product is realized, 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 liquid outlet pump 511. After the second mixing chamber 520 introduces the first compound into the second mixing chamber 520 for a neutralization reaction with the first product, the generated fourth product is transported to the first sedimentation unit 530, and the first sedimentation unit separates the fourth product generated in the second mixing chamber 520; through operations such as neutralization reaction and sedimentation separation in the first conversion unit for the first product, the subsequent separation and treatment process of the first product alone is greatly simplified, the treatment difficulty and cost are reduced, the recycling of the first product is realized, and the resource utilization efficiency is improved.

[0061] In a possible implementation manner, the first compound is an alkaline compound.

[0062] Preferably, the first compound is any one of the alkaline compounds: calcium hydroxide, barium hydroxide, lead hydroxide, strontium hydroxide.

[0063] In a possible implementation manner, it further includes a first recycling pump 540 and a second circulation pump 550; the return end of the first transfer tank 510 is communicated with the discharge port of the first sedimentation unit 530 through the first recycling pump 540. The first recycling pump 540 is configured to send the fourth product separated by the first sedimentation unit 530 back into the first transfer tank 510, and the second discharge end of the first transfer tank 510 is communicated with the first return end of the electrochemical reactor 200 through the second circulation pump 550.

[0064] It should be noted here that the separation operation of the first sedimentation unit 530 is to separate the fourth product. The first recycling pump 540 is suitable for sending the fourth product separated by the first sedimentation unit 530 back into the first transfer tank 510; enabling the fourth product to be recycled, this recycling method improves the utilization rate of the fourth product and reduces the production cost; the second circulation pump 550 is suitable for sending the fourth product in the first transfer tank 510 back to the electrochemical reactor 200, thereby reacting the fourth product containing impurities again, improving the utilization efficiency of the material.

[0065] In a possible implementation, the second conversion unit includes: a second transfer tank 610, an aeration tower assembly, and a second settler assembly 630; a first feed end of the second transfer tank 610 is communicated with a second feed end of the electrochemical reactor 200; a first discharge end of the second transfer tank 610 is communicated with a first feed end of the aeration tower assembly, and a 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 a second product to generate a third product; a first discharge end of the aeration tower assembly is communicated with a feed end of the second settler assembly 630; and the second settler assembly 630 is configured to separate the third product generated by the aeration tower assembly.

[0066] It should be noted here that the second transfer tank 610 is adapted to receive the second product output by the electrochemical reactor 200. The second transfer tank 610 transports the second product into the aeration tower assembly through a second liquid pump 611. The aeration tower assembly captures external carbon dioxide and introduces it into the aeration tower assembly. The captured and introduced carbon dioxide reacts with the second product in the aeration tower assembly to generate a third product. The second settler performs a separation operation on the third product generated by the reaction of the aeration tower assembly. The second settler assembly 630 utilizes the principle of gravitational sedimentation to effectively separate the third product, improving the purity and quality of the third product.

[0067] In a possible implementation, the aeration tower assembly includes: an aeration tower 621, a pressure equalizing tank 622, a gas booster pump 623, and a pressure buffer tank 624; a first feed port of the aeration tower 621 is communicated with a first discharge end of the second transfer tank 610, a second discharge end of the aeration tower 621 is communicated with a feed end of the pressure equalizing tank 622, a discharge end of the pressure equalizing tank 622 is communicated with a feed end of the pressure buffer tank 624 through the gas booster pump 623, and a discharge end of the pressure buffer tank 624 is communicated with a second feed port of the aeration tower 621; a first discharge end of the aeration tower 621 is communicated with a feed port of the second settler assembly 630.

[0068] It should be noted here that after the aeration tower 621 captures external carbon dioxide and enters the aeration tower 621 through the second feed port, the carbon dioxide reacts with the second product in the aeration tower 621 to generate a third product. The design of the aeration tower 621 enables the carbon dioxide and the second product to be fully mixed and reacted, improving the reaction efficiency. The pressure equalizing tank 622 is suitable for balancing the pressure of the discharged material from the aeration tower 621. Through its own volume and internal structure, the pressure equalizing tank 622 makes the pressure of the carbon dioxide and the second product in the aeration tower 621 tend to a stable state. The gas booster pump 623 is suitable for boosting the carbon dioxide and the second product in the aeration tower 621. Appropriate pressure can help the carbon dioxide dissolve better in the second product, thereby improving the production efficiency of the third product. The pressure buffer tank 624 is suitable for absorbing the pressure fluctuations generated due to 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 the carbon dioxide and the second product, and improving the reaction quality.

[0069] In a possible implementation manner, it further includes a second reuse pump 640 and a third circulation pump 650. The discharge end of the second settler assembly 630 is communicated with the return end of the second transfer tank 610 through the second reuse pump 640. The second reuse pump 640 is configured to send the third product separated by the second settler assembly 630 back into the second transfer tank 610. The second discharge end of the second transfer tank 610 is communicated with the second return end of the electrochemical reactor 200 through the third circulation pump 650.

[0070] It should be noted here that the second reuse pump 640 is suitable for sending the third product separated by the second settler assembly 630 back into the second transfer tank 610. By sending the third product back to the second transfer tank 610, the carbon dioxide conversion system of the present application can reuse the useful components in the third product, reduce the waste of raw materials, improve the utilization rate, and reduce the production cost. The third circulation pump 650 is suitable for sending the third product containing impurities in the second transfer tank 610 back to the electrochemical reactor 200, thereby reacting the third product containing impurities again, improving the conversion rate of the system. By setting the third circulation pump 650, the carbon dioxide conversion system of the present application can make more full use of the uncompletely converted third product for secondary reaction, reduce the emission of unreacted substances, and improve the economic and environmental benefits of the whole system.

[0071] In a possible implementation, it further includes a cooling component. The cooling component is suitable for cooling the electrochemical reactor 200, and can control the temperature within the optimal activity temperature range. Appropriate temperature conditions can accelerate the reaction rate of the reactants to be reacted, 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 water outlet of the cooling water tank 730 is connected to the input end of the cooling pump 720, the output end of the cooling pump 720 is connected to the input end of the cooler 710, the output end of the cooler 710 is connected to the input end of the cooling medium of the electrochemical reactor 200, and the output end of the cooling medium of the electrochemical reactor 200 is connected to the water return port of the cooling water tank 730.

[0072] According to another aspect of the application, a carbon dioxide conversion method is provided. The above carbon dioxide conversion system is used to convert carbon dioxide. The reactants to be reacted and water are introduced into the first mixing chamber and stirred and mixed therein. The mixed reactants to be reacted and water are transported into the electrochemical reactor 200, and the electrochemical reactor 200 performs a water splitting reaction on water to generate hydroxide ions and hydrogen ions, and based on the generated hydroxide ions and hydrogen ions, they react with the reactants to be reacted to generate a first product and a second product respectively. The second product generated by the electrochemical reactor 200 is transported to the second conversion unit, and the second conversion unit uses the second product decomposed by the electrochemical reactor 200 to capture and convert carbon dioxide into a third product. The first product generated by the electrochemical reactor 200 is transported to the first conversion unit, and the first conversion unit converts the first product generated by the electrochemical reactor 200.

[0073] Example 1: When the reactant to be reacted is selected as sodium sulfate: After the first mixing chamber mixes and dilutes the sodium sulfate solution and water to form a mixed solution, the first mixing chamber transports the mixed solution into the first chamber 410 of the electrochemical reactor 200. The anion membrane 230 can separate the negatively charged sulfate radicals in the sodium sulfate solution and gather them into the third chamber 430. Since the catalytic cathode 315 of the second water splitting unit 320 faces the anion membrane 230, when water enters the fifth chamber 450 of the second water splitting unit 320, the second water splitting unit 320 will electrolyze the positively charged hydrogen ions from the water, and the cathode membrane 311 will precipitate and gather the hydrogen ions into the third chamber 430 of the electrochemical reactor 200. At this time, the third chamber 430 contains the hydrogen ions electrolyzed from water and the sulfate radicals decomposed from sodium sulfate. At this time, the hydrogen ions can undergo a double decomposition reaction with the sulfate radicals to form sulfuric acid.

[0074] The cation exchange membrane 240 can decompose the sodium ions in sodium sulfate and collect them in the second chamber 420. Since the catalytic anode 312 of the first water electrolysis unit faces the cation exchange membrane 240, when water enters the fourth chamber 440 of the first water electrolysis unit 310, the first water electrolysis unit 310 will electrolyze water to produce hydroxide ions, and the anode membrane 314 will precipitate the hydroxide ions and collect them in the second chamber 420. At this time, the second chamber 420 contains hydroxide ions obtained by semi-electrolyzing water and sodium ions decomposed from sodium sulfate. At this time, the hydroxide ions and sodium ions undergo a double decomposition reaction to form sodium hydroxide. It should be noted that the purity of the sodium hydroxide obtained at this time is higher than 98%.

[0075] The reaction equation 1 of Example 1 is as follows: Na2SO4 + 2H2O → H2SO4 + 2NaOH.

[0076] In summary, the electrochemical reactor 200 can carry out a double decomposition reaction between water and sodium sulfate to obtain sulfuric acid and sodium hydroxide. The newly formed substances sulfuric acid and sodium hydroxide are both common chemical substances. Among them, the sodium hydroxide generated by the double decomposition reaction of Example 1 of the present application can realize the capture, storage, and high-value conversion of carbon dioxide through the second conversion unit. The specific application is as follows: 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 the external carbon dioxide and introduces it into the aeration tower assembly. After the captured and introduced carbon dioxide reacts with the sodium hydroxide in the aeration tower assembly, sodium bicarbonate is generated. The second sedimentation tank separates the sodium bicarbonate generated by the reaction of the aeration tower assembly. Since sodium bicarbonate appears in two forms, solid and liquid, after the reaction, the second sedimentation tank assembly 630 uses the principle of gravitational sedimentation to precipitate sodium bicarbonate, thereby realizing the effective separation of solid and liquid sodium bicarbonate and improving the purity and quality of sodium bicarbonate.

[0077] The reaction equation 2 is as follows: 2NaOH + 2CO2 = 2Na2CO3. It should be noted that the purity of the sodium bicarbonate obtained at this time is higher than 99.5%.

[0078] Further, it further includes a second recycling pump 640 and a third circulation pump 650; the second recycling pump 640 sends the liquid sodium bicarbonate separated by the second sedimentation unit 630 back to the second transfer tank 610. By sending the liquid sodium bicarbonate back to the second transfer tank 610, the carbon dioxide conversion system of the present application can reuse the useful components in the liquid sodium bicarbonate, reduce the waste of raw materials, improve the utilization rate, reduce the production cost. The third circulation pump 650 sends the sodium hydroxide containing impurities and the liquid sodium bicarbonate in the second transfer tank 610 back to the electro-chemical reactor 200, so as to react the sodium hydroxide containing impurities and the liquid sodium bicarbonate again, improve the conversion rate of the system. At the same time, the carbon dioxide conversion system of the present application can make more full use of the uncompletely converted raw materials for secondary reaction, reduce the emission of unreacted substances, and improve the economic and environmental benefits of the whole system.

[0079] Further, the sulfuric acid generated by the double decomposition reaction of Embodiment 1 of the present application can be converted through the first conversion unit. When the reactant to be reacted is selected as sodium sulfate, correspondingly, the first compound can be selected as calcium hydroxide. The specific application is as follows: The first transfer tank 510 transports the sulfuric acid generated by the electro-chemical reactor 200 to the second mixing chamber 520. The second mixing chamber 520 introduces calcium hydroxide into the second mixing chamber 520 and performs an acid-base neutralization reaction with the sulfuric acid to generate calcium sulfate and water. The separated calcium sulfate and water are transported to the first sedimentation unit. Since calcium sulfate is a precipitate and water is a liquid, the first sedimentation unit uses the principle of gravity sedimentation to separate the generated calcium sulfate and water. After the calcium sulfate precipitates, it is discharged from the bottom of the first sedimentation unit 530, and the upper water is discharged from one side of the first sedimentation unit 530; the first conversion unit converts the corrosive sulfuric acid into relatively more easily processed and valuable calcium sulfate and clean water by performing a neutralization reaction between sulfuric acid and calcium hydroxide in the second mixing chamber 520; calcium sulfate can be used for various purposes such as building materials and industrial fillers, and the water can be directly discharged into the natural environment without secondary treatment.

[0080] Reaction equation 3 is as follows: H2SO4 + Ca(OH)2 = CaSO4 + 2H2O.

[0081] In a possible implementation manner, the carbon dioxide conversion system of the present application is provided with a first recycling pump 540 and a second circulation pump 550. The first recycling pump 540 sends the water separated by the first settler assembly 530 back into the first transfer tank 510, enabling the water to be recycled in this part of the system. This way of recycling water 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 sends the water in the first transfer tank 510 and the sulfuric acid containing impurities back to the electrochemical reactor 200, thereby reacting the sulfuric acid containing impurities again and improving the utilization efficiency of the materials.

[0082] By applying the carbon dioxide conversion system of the present application, carbon dioxide can be converted into sodium bicarbonate with high economic value and large market capacity. The carbon dioxide is successfully utilized effectively, and is also converted into chemical products that can generate profits, carrying out carbon capture, utilization and storage. At the same time, it can also be applied to the value-added conversion and utilization of sodium sulfate solid waste. The water finally obtained by converting carbon dioxide can be directly discharged to the outside. The obtained calcium sulfate, as an inorganic compound, can be applied in the building industry, paper industry, and chemical industry. The obtained sodium bicarbonate, commonly known as baking soda, is an inorganic compound and can be applied in other fields such as the pharmaceutical industry, food processing, and fire-fighting equipment. Thus, zero emission of carbon dioxide is achieved.

[0083] Example 2: When the reactant to be used is potassium sulfate: After the first mixing chamber mixes the potassium sulfate solution with water to form a mixed solution, the first mixing chamber transports the mixed solution into the first chamber 410 of the electrochemical reactor 200. The anion membrane 230 can separate the sulfate ions in potassium sulfate and collect them in the third chamber 430. Since the catalytic cathode 315 of the second water electrolysis unit 320 faces the anion membrane 230, when water enters the fifth chamber 450 of the second water electrolysis unit 320, the second water electrolysis unit 320 will electrolyze the water to produce positively charged hydrogen ions, and the cathode membrane 311 will precipitate and collect the hydrogen ions in the third chamber 430 of the electrochemical reactor 200. At this time, the third chamber 430 contains hydrogen ions electrolyzed from water and sulfate ions decomposed from potassium sulfate. At this time, the hydrogen ions can undergo a double decomposition reaction with the sulfate ions to form sulfuric acid.

[0084] The cation membrane 240 can decompose the potassium ions in potassium sulfate and collect them in the second chamber 420. The first water electrolysis unit 310 will electrolyze the water to produce hydroxide ions, and the anode membrane 314 will precipitate and collect the hydroxide ions in the second chamber 420. At this time, the second chamber 420 contains hydroxide ions semi-electrolyzed from water and potassium ions decomposed from potassium sulfate. At this time, the hydroxide ions can react with the potassium ions to form potassium hydroxide.

[0085] The newly formed substances sulfuric acid and potassium hydroxide are both common chemical substances. Among them, the potassium hydroxide produced by the double decomposition reaction in Example 2 of this application can achieve the capture, storage, and high-value conversion of carbon dioxide through the second conversion unit. The specific application is as follows: 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 the external carbon dioxide and introduces it into the aeration tower assembly. The captured and introduced carbon dioxide undergoes an acid-base neutralization reaction with the potassium hydroxide in the aeration tower assembly to generate potassium carbonate and water. The second settler separates the potassium carbonate and water generated by the reaction of the aeration tower assembly, thereby effectively separating potassium carbonate and water.

[0086] The reaction equation 4 is as follows: 2KOH + CO2 = K2CO3 + H2O.

[0087] Furthermore, the sulfuric acid produced by the double decomposition reaction in Example 2 of this application can be converted through the first conversion unit. The specific steps of the conversion of sulfuric acid by the first conversion unit have been described in detail in Example 1 above and will not be elaborated here.

[0088] The potassium hydroxide obtained by applying the electrochemical reactor 200 of this application can convert carbon dioxide into potassium carbonate with high economic value. As an inorganic compound, it can be used in the production of soaps, glass tableware, and desiccants; the water finally obtained by converting carbon dioxide can be directly discharged to the outside.

[0089] Example 3: When the reactant to be selected is potassium chloride: After the first mixing chamber mixes the potassium chloride solution and water 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 membrane 230 can separate the chloride ions in potassium chloride and collect them in the third chamber 430. Since the catalytic cathode 315 of the second water electrolysis unit 320 faces the anion membrane 230, when water enters the fifth chamber 450 of the second water electrolysis unit 320, the second water electrolysis unit 320 will electrolyze the water to produce positively charged hydrogen ions. The cathode membrane 311 precipitates 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 electrolyzed from water and chloride ions decomposed from potassium chloride. At this time, the hydrogen ions can undergo a double decomposition reaction with the chloride ions to form hydrogen chloride; hydrogen chloride can be used to manufacture corrosion inhibitors, dyes, spices, drugs, and various chlorides.

[0090] The cationic membrane 240 can decompose the potassium ions in potassium chloride and gather them into the second chamber 420. The first water semi-electrolysis unit 310 will electrolyze water to produce hydroxide ions. The anode membrane 314 will precipitate and gather the hydroxide ions into the second chamber 420. At this time, the second chamber 420 contains hydroxide ions obtained by semi-electrolyzing water and potassium ions decomposed from potassium chloride. At this time, the hydroxide ions can react with the potassium ions to form potassium hydroxide.

[0091] In summary, the newly formed substances potassium chloride and potassium hydroxide are both common chemical substances. The potassium hydroxide generated by the reaction in Embodiment 3 of the present application can achieve the capture, storage, and high-value conversion of carbon dioxide through the second conversion unit. Among them, the specific steps of the second conversion unit for converting potassium hydroxide have been described in detail in the previous Embodiment 2, and will not be repeated here.

[0092] Embodiment 4: When the reactant to be selected is sodium chloride: After the first mixing chamber mixes sodium chloride with water to form a diluted mixture, the first mixing chamber transports the mixture to the first chamber 410 of the electro-chemical reactor 200. The anion membrane 230 can separate the chloride ions in sodium chloride and gather them into the third chamber 430. Since the catalytic cathode 315 of the second water semi-electrolysis unit 320 faces the anion membrane 230, when water enters the fifth chamber 450 of the second water semi-electrolysis unit 320, the second water semi-electrolysis unit 320 will electrolyze water to produce positively charged hydrogen ions. The cathode membrane 311 will precipitate and gather the hydrogen ions into the third chamber 430 of the electro-chemical reactor 200. At this time, the third chamber 430 contains hydrogen ions electrolyzed from water and chloride ions decomposed from sodium chloride. At this time, the hydrogen ions can undergo a double decomposition reaction with the chloride ions to generate hydrogen chloride; the hydrogen chloride can be directly applied to other industries or technologies.

[0093] The cationic membrane 240 can decompose the sodium ions in sodium chloride and gather them into the second chamber 420. The first water semi-electrolysis unit 310 will electrolyze water to produce hydroxide ions. The anode membrane 314 will precipitate and gather the hydroxide ions into the second chamber 420. At this time, the second chamber 420 contains hydroxide ions obtained by semi-electrolyzing water and sodium ions decomposed from sodium chloride. The hydroxide ions can react with the sodium ions to form sodium hydroxide.

[0094] In summary, the newly formed substances hydrogen chloride and sodium hydroxide are both common chemical substances. The sodium hydroxide generated by the reaction in Embodiment 4 of the present application can achieve the capture, storage, and high-value conversion of carbon dioxide through the second conversion unit. Among them, the specific steps of the second conversion unit for converting sodium hydroxide have been described in detail in the previous Embodiment 1, and will not be repeated here.

[0095] The carbon dioxide conversion system of the present application has the following beneficial effects: 1. By ingeniously combining electrocatalytic electrolysis technology, it realizes the conversion of sodium sulfate and carbon dioxide into sodium bicarbonate with low power consumption, and has competitiveness with traditional baking soda products in the market (potentially replacing sodium carbonate and sodium bicarbonate produced from traditional natural alkali mines). 2. It can solve the problem of urgently needed carbon dioxide emission reduction in the market to achieve positive benefits, realizes carbon dioxide emission reduction and generates positive benefits, and promotes the enthusiasm of enterprises for emission reduction.

[0096] 3. It can be applied to the value-added conversion and utilization of sodium sulfate solid waste; it can realize the conversion of anions and cations of salts (for example, potassium chloride can obtain potassium hydroxide and hydrochloric acid through a half electrolysis water unit).

[0097] 4. The reaction conditions are mild, and the starting reaction temperature is in the range of normal temperature 20 - 30 °C, which can meet the requirements of green power from wind and solar. All raw materials and auxiliary materials are purchased domestically and independently prepared, without relying on the industrial chain. High temperature, high pressure, and high-grade heat sources are not required in the overall process, saving the energy consumption of the evaporation process and improving the safety and reliability in the production process. The overall process flow meets the requirements of integrated gasification combined cycle.

[0098] 5. If a solid electrolyte layer SSE is added between the anion membrane 800 and the cation membrane 900, a battery voltage of 0.8 V can be formed. (SSE is a solid ion conductor and electron insulating material, which is a characteristic component of solid-state batteries). It is rinsed and circulated with deionized water to improve the ionic conductivity and stability of the solid electrolyte SSE, which can improve the energy efficiency of the electrolyzer and overall reduce the power consumption.

[0099] 6. For the sodium carbonate or sodium bicarbonate obtained by carbon capture, the CO2 inside can be dissociated again through a half electrolysis water unit.

[0100] 7. The cost is low; it is lower than the cost of traditional baking soda manufacturing in the market; at the same time, the cost of some traditional ways of treating carbon dioxide is relatively high (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 electrocatalytic production of protein from carbon dioxide is ten thousand times the cost of ordinary protein production), and compared with these traditional ways of treating carbon dioxide, the process flow of this application is not only simple but also has low cost.

[0101] The above has described the embodiments of this application. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technologies in the market, or to enable other ordinary skill in the art in the technical field to understand the disclosed embodiments.

Claims

1. A carbon dioxide conversion system, characterized in that, Comprising: 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 adapted to introduce reactants to be reacted and water; The discharge end of the first mixing chamber is in communication with the feed end of the electrochemical reactor, and the electrochemical reactor is configured to perform a water electrolysis 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 be reacted to generate a first product and a second product respectively; The feed end of the first conversion unit is in communication with 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 in communication with the second discharge end of the electrochemical reactor and is configured to capture carbon dioxide using the second product generated by the electrochemical reactor and convert it into a third product.

2. The carbon dioxide conversion system according to claim 1, wherein The first conversion unit includes: a first transfer tank, a second mixing chamber, and a first settler assembly; The first feed end of the first transfer tank is in communication with the first discharge end of the electrochemical reactor, the first discharge end of the first transfer tank is in communication with the first feed end of the second mixing chamber, the second feed end of the second mixing chamber is adapted to introduce a first compound, and the second mixing chamber is configured to perform a neutralization reaction on the first product and the first compound to generate a fourth product; The discharge end of the second mixing chamber is in communication with the feed end at the top of the first settler assembly; the first settler assembly is configured to separate the fourth product generated by the second mixing chamber.

3. The carbon dioxide conversion system according to claim 2, characterized in that, Also included are a first recycle pump and a second circulation pump; The recycle end of the first transfer tank is in communication with the discharge port of the first settler assembly through the first recycle pump, and the first recycle pump is configured to send the fourth product separated by the first settler assembly back into the first transfer tank, The second discharge end of the first transfer tank is in communication with the first recycle end of the electrochemical reactor through the second circulation pump.

4. The carbon dioxide conversion system according to claim 1, wherein, The second conversion unit includes: a second transfer tank, a stripping tower assembly, and a second settler assembly; The first feed end of the second transfer tank is in communication with the second feed end of the electrochemical reactor; the first discharge end of the second transfer tank is in communication with the first feed end of the stripping tower assembly, the second feed end of the stripping tower assembly is adapted to introduce carbon dioxide, and the stripping tower assembly is configured to react the captured carbon dioxide with the second product to generate a third product; The first discharge end of the stripping tower assembly is in communication with the feed end of the second settler assembly; the second settler assembly is configured to separate the third product generated by the stripping tower assembly.

5. The carbon dioxide conversion system according to claim 4, wherein Also included are a second recycle pump and a third circulation pump; The discharge end of the second settler assembly is in communication with the recycle end of the second transfer tank through the second recycle pump, and the second recycle pump is configured to send the third product separated by the second settler assembly back into the second transfer tank; The second discharge end of the second transfer tank is in communication with the second recycle end of the electrochemical reactor through the third circulation pump.

6. The carbon dioxide conversion system according to claim 1, characterized in that The electro-chemical reactor includes: an anode plate, a cathode plate, an anion membrane, a cation membrane, a first water electrolysis unit, and a second water electrolysis unit; The first water electrolysis unit and the second water electrolysis unit are arranged oppositely, and the anion membrane and the cation membrane are arranged between the two water electrolysis units; The anode plate is arranged on a side of the first water electrolysis unit away from the anion membrane, and the cathode plate is arranged on a side of the second water electrolysis unit away from the cation membrane.

7. The carbon dioxide conversion system according to claim 6, characterized in that, Each of the first water electrolysis unit and the second water electrolysis unit includes: a cathode membrane, a catalytic anode, and an insulating diaphragm; The cathode membrane and the insulating diaphragm are arranged oppositely, the catalytic anode is arranged between the cathode membrane and the insulating diaphragm, and the cathode membrane is attached to a side of the catalytic anode away from the insulating diaphragm; The catalytic anode is connected to the anode of a second power source.

8. The carbon dioxide conversion system according to claim 7, wherein Each of the first water electrolysis unit and the second water electrolysis unit further includes: an anode membrane and a catalytic cathode; The anode membrane is arranged on a side of the insulating diaphragm away from the cathode membrane, The catalytic cathode is arranged between the anode membrane and the insulating diaphragm, and the anode membrane is attached to a side of the catalytic cathode away from the insulating diaphragm; The catalytic cathode is connected to the cathode of the second power source.

9. A method for carbon dioxide conversion, which uses the carbon dioxide conversion system according to any one of claims 1-8 to convert carbon dioxide, characterized in that, Introduce the reactant to be treated and water into the first mixing chamber and stir and mix them in the first mixing chamber; Transport the mixed reactant to be treated and water into the electro-chemical reactor, and the electro-chemical reactor performs a water electrolysis reaction on water to generate hydroxide ions and hydrogen ions, and respectively react with the reactant to be treated based on the generated hydroxide ions and hydrogen ions to generate a first product and a second product; Transport the second product generated by the electro-chemical reactor to the second conversion unit, and the second conversion unit uses the second product decomposed by the electro-chemical reactor to capture carbon dioxide and convert it into a third product.

10. The carbon dioxide conversion method according to claim 9, characterized in that, It further includes: Transport the first product generated by the electro-chemical reactor to the first conversion unit, and the first conversion unit converts the first product generated by the electro-chemical reactor.

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