Carbon dioxide trapping and coupling modularized electrolytic hydrogen production system

Abstract

The embodiment of the invention provides a carbon dioxide trapping and coupling modularized electrolytic hydrogen production system which comprises an absorption device, and a carbon dioxide absorption liquid solution is arranged in the absorption device and used for absorbing carbon dioxide; the electrolytic hydrogen production device comprises a plurality of electrolytic units, each electrolytic unit comprises an anode chamber and a cathode chamber which are isolated from each other, an anode electrode is arranged in each anode chamber, a cathode electrode is arranged in each cathode chamber, the polarities of the two adjacent electrodes of the two adjacent electrolytic units are opposite, the anode chambers are communicated with the absorption liquid outlet of the absorption device, and the cathode chambers are communicated with the absorption liquid outlet of the absorption device. The cathode chamber is communicated with an absorption liquid inlet of the absorption device; the first gas-liquid separation device is communicated with an anode liquid outlet of the anode chamber, and the first gas-liquid separation device is communicated with a cathode liquid inlet of the cathode chamber; and the second gas-liquid separation device is communicated with a cathode liquid outlet of the cathode chamber, and the second gas-liquid separation device is communicated with an absorption liquid inlet of the absorption device.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of gas purification and separation, and specifically relate to a carbon dioxide capture-coupled modular electrolysis hydrogen production system. Background Art

[0002] Carbon dioxide (CO2) is the main greenhouse gas that causes global warming. The capture, utilization and storage of CO2 has become one of the hot topics of international concern. my country's coal-fired power generation CO2 emissions account for about 50% of total industrial emissions. The capture and separation of CO2 in the flue gas of coal-fired power plants is an important area for greenhouse gas emission reduction. In addition, there are also a large number of CO2 capture or separation processes in industrial fields such as steelmaking, cement, and chemical industry (such as synthetic ammonia, hydrogen production, and natural gas purification).

[0003] In the related art, a thermal regeneration amine capture process is used, but the regeneration of the amine solvent in the thermal regeneration amine capture process consumes a large amount of thermal energy, resulting in high energy consumption for CO2 capture and low resource utilization. Summary of the invention

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a carbon dioxide capture coupled modular electrolysis hydrogen production system.

[0005] An embodiment of the present disclosure provides a carbon dioxide capture coupled modular electrolysis hydrogen production system, the carbon dioxide capture coupled modular electrolysis hydrogen production system comprising:

[0006] An absorption device, wherein the absorption device contains a carbon dioxide absorption liquid, and the absorption device has an absorption air inlet, an absorption exhaust port, an absorption liquid discharge port and an absorption liquid inlet, wherein the absorption air inlet is used to introduce flue gas, and the absorption exhaust port is used to discharge the flue gas decarbonated with carbon dioxide;

[0007] An electrolytic hydrogen production device, comprising a plurality of electrolytic units, each of which comprises an anode chamber and a cathode chamber isolated from each other, wherein an anode electrode is disposed in the anode chamber, and a cathode electrode is disposed in the cathode chamber, and two electrodes close to each other in two adjacent electrolytic units have opposite polarities, each of which has an anode liquid inlet and an anode liquid discharge port, each of which is connected to the absorption liquid discharge port, and each of which has a cathode liquid inlet and a cathode liquid discharge port;

[0008] a first gas-liquid separation device, each of the anode liquid discharge ports being in communication with the first gas-liquid separation device, the first gas-liquid separation device being used to separate carbon dioxide, oxygen and an anode separation solution from the anode gas-liquid mixture transported by the anode liquid discharge port, the first gas-liquid separation device being in communication with each of the cathode liquid inlets to provide the anode separation solution to the cathode chamber;

[0009] The second gas-liquid separation device comprises a separation liquid inlet, a separation liquid discharge port and a separation exhaust port, wherein the separation liquid inlet is connected to each of the cathode liquid discharge ports, the separation liquid discharge port is connected to the absorption liquid inlet port, and the separation exhaust port is used to discharge hydrogen. The second gas-liquid separation device is used to separate hydrogen and the carbon dioxide absorption liquid from the cathode gas-liquid mixture transported by the cathode liquid discharge port.

[0010] In some embodiments of the present disclosure, the first gas-liquid separation device comprises:

[0011] A flash tank, wherein the flash tank has a flash liquid inlet, a flash liquid discharge port, a flash gas outlet and a flash liquid return port, wherein the flash liquid inlet is connected to each of the anode liquid discharge ports, and the flash liquid discharge port is connected to each of the cathode liquid inlet;

[0012] A condenser, wherein the condenser has a condensation air inlet, a condensation liquid drain port and a condensation exhaust port, wherein the condensation air inlet is connected to the flash exhaust port, the condensation liquid drain port is connected to the flash liquid return port, and the condensation exhaust port is used to discharge carbon dioxide and oxygen.

[0013] In some embodiments of the present disclosure, the carbon dioxide capture coupled modular electrolysis hydrogen production system further includes:

[0014] A desulfurization device, the desulfurization device has a desulfurization air inlet, a desulfurization exhaust port, a desulfurization liquid inlet and a desulfurization liquid discharge port, the desulfurization air inlet is used to introduce flue gas, the desulfurization exhaust port is connected with the absorption air inlet, the desulfurization liquid inlet is used to introduce desulfurization solution, and the desulfurization liquid discharge port is used to discharge sulfur-containing solution.

[0015] In some embodiments of the present disclosure, the carbon dioxide capture coupled modular electrolysis hydrogen production system further includes:

[0016] A removal device, the removal device having a removal air inlet, a removal liquid inlet and a removal liquid discharge port, the removal air inlet is connected to the absorption exhaust port, the removal liquid inlet is used to introduce the removal solution, the removal liquid discharge port is used to discharge the removal solution, and the removal device is used to absorb at least one of ammonia, organic amines, and amino acid salts.

[0017] In some embodiments of the present disclosure, the removal liquid discharge port is connected to the desulfurization liquid inlet port.

[0018] In some embodiments of the present disclosure, the removal device further includes a removal liquid return port, and the removal liquid return port is connected to the desulfurization liquid discharge port.

[0019] In some embodiments of the present disclosure, the carbon dioxide capture coupled modular electrolysis hydrogen production system further includes:

[0020] The first heat exchange device has a first cold end and a first hot end, the inlet of the first cold end is connected to the removal drainage port, the outlet of the first hot end is connected to the desulfurization liquid inlet, the inlet of the first hot end is connected to the desulfurization drainage port, and the outlet of the first hot end is connected to the removal liquid return port.

[0021] In some embodiments of the present disclosure, the carbon dioxide capture coupled modular electrolysis hydrogen production system further includes:

[0022] A recovery device is provided with a recovery liquid inlet, and the recovery liquid inlet is connected to the desulfurization liquid discharge port.

[0023] In some embodiments of the present disclosure, the carbon dioxide capture coupled modular electrolysis hydrogen production system further includes:

[0024] A second heat exchange device, wherein the second heat exchange device has a second cold end and a second hot end, the inlet of the second cold end is connected to the absorption drain port, the outlet of the second hot end is connected to each of the anode liquid inlets, the inlet of the second hot end is connected to the separation drain port, and the outlet of the second cold end is connected to the absorption liquid inlet.

[0025] In some embodiments of the present disclosure, the anode electrode in the anode chamber is an oxygen evolution electrode, and the oxygen evolution electrode is any one of a ruthenium oxide electrode, an iridium oxide electrode, a nickel-iron alloy electrode, and a nickel-iron oxide electrode;

[0026] The cathode electrode in the cathode chamber is a hydrogen evolution electrode, and the hydrogen evolution electrode is any one of a platinum-carbon electrode, a platinum-ruthenium-carbon electrode, a nickel-molybdenum alloy electrode, and a nickel-molybdenum oxide electrode.

[0027] According to the carbon dioxide capture coupled modular electrolytic hydrogen production system of the embodiment of the present disclosure, the carbon dioxide in the flue gas is absorbed by the carbon dioxide absorption liquid of the absorption device, and then the carbon dioxide in the carbon dioxide absorption liquid is analyzed by the electrolytic hydrogen production device. In the process of carbon dioxide analysis, the multiple electrolytic units of the electrolytic hydrogen production system can also realize electrolytic hydrogen production. Finally, the gas-liquid mixture of the anode chamber and the gas-liquid mixture of the cathode chamber are separated by the first gas-liquid separation device and the second gas-liquid separation device, respectively, to achieve the recovery of carbon dioxide, hydrogen and oxygen, thereby achieving the purpose of capturing carbon dioxide in the flue gas. At the same time, electrolytic hydrogen production is realized in the process of analyzing carbon dioxide to obtain hydrogen and oxygen, so as to improve the utilization rate of resources. In addition, the electrolytic hydrogen production device can also realize the regeneration of the carbon dioxide absorption liquid during the electrolysis process to realize the circulation of the carbon dioxide absorption liquid and achieve the purpose of saving resources. In addition, multiple hydrogen production units can improve the hydrogen production capacity and at the same time improve the analysis capacity of the carbon dioxide-rich solution output by the absorption device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of a carbon dioxide capture-coupled modular hydrogen production system according to an embodiment of the present disclosure.

[0029] The reference numerals in the accompanying drawings represent the following:

[0030] 100. Carbon dioxide capture coupled with modular electrolysis hydrogen production system;

[0031] 10. Absorption device;

[0032] 20. Electrolytic hydrogen production device; 201. Anode chamber; 202. Cathode chamber; 203. Anion exchange membrane; 21. Anode electrode; 22. Cathode electrode;

[0033] 30. First gas-liquid separation device; 31. Flash tank; 32. Condenser;

[0034] 40. A second gas-liquid separation device;

[0035] 50. Desulfurization device;

[0036] 60. Removal device;

[0037] 70. first heat exchange device; 71. first cold end; 72. first hot end;

[0038] 80. Recovery device;

[0039] 90. Second heat exchange device; 91. Second cold end; 92. Second hot end. DETAILED DESCRIPTION

[0040] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0041] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0042] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0043] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0044] like Figure 1As shown, an embodiment of the present disclosure provides a carbon dioxide capture coupled modular electrolysis hydrogen production system 100, the carbon dioxide capture coupled modular electrolysis hydrogen production system 100 comprises: an absorption device 10, an electrolysis hydrogen production device 20, a first gas-liquid separation device 30 and a second gas-liquid separation device 40, the absorption device 10 contains carbon dioxide absorption liquid, the absorption device 10 has an absorption air inlet, an absorption exhaust port, an absorption liquid discharge port and an absorption liquid inlet, the absorption air inlet is used to introduce flue gas, the absorption exhaust port is used to discharge the flue gas decarbonated with carbon dioxide, the electrolysis hydrogen production device 20 comprises a plurality of electrolysis units, each electrolysis unit comprises an anode chamber 201 and a cathode chamber 202 isolated from each other, an anode electrode 21 is provided in the anode chamber 201, a cathode electrode 22 is provided in the cathode chamber 202, the polarities of two electrodes close to each other in two adjacent electrolysis units are opposite, and each The anode chamber 201 has an anode liquid inlet and an anode liquid drain, each of which is connected to the absorption liquid drain. Each cathode chamber 202 has a cathode liquid inlet and a cathode liquid drain, each of which is connected to the first gas-liquid separation device 30. The first gas-liquid separation device 30 is used to separate the anode gas-liquid mixture transported by the anode liquid drain into carbon dioxide, oxygen and anode separation solution. The first gas-liquid separation device 30 is connected to each cathode liquid inlet to provide the cathode chamber 202 with an anode separation solution. The second gas-liquid separation device 40 has a separation liquid inlet, a separation liquid drain and a separation exhaust port. The separation liquid inlet is connected to each cathode liquid drain, the separation liquid drain is connected to the absorption liquid inlet, and the separation exhaust port is used to discharge hydrogen. The second gas-liquid separation device 40 is used to separate hydrogen and carbon dioxide absorption liquid from the cathode gas-liquid mixture transported by the cathode liquid drain.

[0045] The carbon dioxide capture coupled modular electrolysis hydrogen production system 100 disclosed in the present invention, flue gas enters the absorption device 10 through the absorption air inlet of the absorption device 10, the absorption liquid inlet of the absorption device 10 introduces the carbon dioxide absorption liquid into the absorption device 10, and contacts and reacts with the flue gas by spraying to absorb the carbon dioxide in the flue gas, and the carbon dioxide in the flue gas is discharged from the absorption device 10 through the hand washing exhaust port after being absorbed, and the carbon dioxide absorption liquid absorbs the carbon dioxide in the flue gas to form a carbon dioxide-rich solution, and the carbon dioxide-rich solution enters each anode chamber 201 through each anode liquid inlet, and the carbon dioxide-rich solution is used as the electrolyte solution of the anode chamber 201, and the anode chamber 201 undergoes a water electrolysis reaction and generates oxygen, and at the same time, the OH- concentration near the anode electrode 21 decreases, the acidity of the electrolyte solution increases, and carbon dioxide is resolved from the solution. Each anode liquid discharge port transports the gas-liquid mixture formed by oxygen, carbon dioxide and electrolyte solution to the first separation device, and the oxygen, carbon dioxide and electrolyte solution in the gas-liquid mixture are separated by the first separation device, and the electrolyte solution is transported to each cathode chamber 202 through the cathode liquid inlet. Water electrolysis reaction occurs in the cathode chamber 202 to generate hydrogen, and the OH- concentration near the cathode increases, the alkalinity of the solution in the cathode chamber 202 is enhanced, and the carbon dioxide absorption liquid is regenerated. The cathode chamber 202 transports the gas-liquid mixture of hydrogen and carbon dioxide absorption liquid to the second gas-liquid separation device 40 through each cathode discharge port, and the hydrogen and carbon dioxide absorption liquid are separated by the second gas-liquid separation device 40, and the carbon dioxide absorption liquid is transported to the absorption device 10 through the absorption inlet to achieve the circulation regeneration of the carbon dioxide absorption liquid.

[0046] The carbon dioxide capture coupled modular electrolytic hydrogen production system 100 disclosed in the present invention absorbs carbon dioxide in flue gas through the carbon dioxide absorption liquid of the absorption device 10, and then analyzes the carbon dioxide in the carbon dioxide absorption liquid through multiple electrolysis units of the electrolytic hydrogen production device 20. During the carbon dioxide analysis process, the electrolytic hydrogen production system can also realize electrolytic hydrogen production. Finally, the gas-liquid mixture of the anode chamber 201 and the gas-liquid mixture of the cathode chamber 202 are separated by gas and liquid through the first gas-liquid separation device 30 and the second gas-liquid separation device 40, respectively, to achieve the recovery of carbon dioxide, hydrogen and oxygen, thereby achieving the purpose of capturing carbon dioxide in flue gas. At the same time, electrolytic hydrogen production is achieved in the process of analyzing carbon dioxide to improve resource utilization. In addition, the electrolytic hydrogen production device 20 can also realize the regeneration of carbon dioxide absorption liquid during the electrolysis process to realize the circulation of carbon dioxide absorption liquid, reduce the additional supplement of carbon dioxide absorption liquid in the absorption device 10, and achieve the purpose of saving resources. In addition, multiple hydrogen production units can improve the hydrogen production capacity and at the same time improve the analysis capacity of the carbon dioxide-rich solution output by the absorption device.

[0047] In some embodiments of the present disclosure, the anode electrode 21 in the anode chamber 201 is an oxygen evolution electrode, and the oxygen evolution electrode includes but is not limited to any one of a ruthenium oxide electrode, an iridium oxide electrode, a nickel-iron alloy electrode, and a nickel-iron oxide electrode. According to the formula: 4OH--4e-=O2↑+2H2O, any one of the oxygen evolution electrodes undergoes an electrolytic oxygen production process in the anode chamber 201, and generates oxygen. The OH- in the anode chamber 201 decreases, the acidity of the electrolyte solution increases, and carbon dioxide is resolved from the solution, thereby achieving the resolution of carbon dioxide. The cathode chamber 202 and the anode chamber 201 are isolated by an anion exchange membrane 203.

[0048] In some embodiments of the present disclosure, the cathode electrode 22 in the cathode chamber 202 is a hydrogen evolution electrode, which includes but is not limited to any one of a platinum carbon electrode, a platinum ruthenium carbon electrode, a nickel molybdenum alloy electrode, and a nickel molybdenum oxide electrode. Any of the hydrogen evolution electrodes, according to the formula: 4H2O+4e-=2H2↑+4OH-, electrolyzes water in the cathode chamber 202 to generate hydrogen, and the OH- concentration near the cathode increases, and the alkalinity of the solution in the cathode chamber 202 is enhanced, thereby achieving the regeneration of the carbon dioxide absorption liquid.

[0049] Specifically, the absorption device 10 is an absorption tower, the absorption air inlet is arranged at the bottom of the absorption tower, the absorption liquid inlet is arranged at the top or upper part of the absorption tower, the carbon dioxide absorption liquid is sprayed to the bottom or lower part of the absorption tower through the absorption liquid inlet at the top or upper part of the absorption tower, the flue gas enters the absorption tower from the absorption air inlet at the bottom of the absorption tower and moves to the top of the absorption tower, the carbon dioxide absorption liquid sprayed downward is fully in contact with the flue gas moving upward, so that the carbon dioxide absorption liquid fully absorbs the carbon dioxide gas in the flue gas. The absorption liquid discharge port is arranged at the bottom of the absorption tower, after the carbon dioxide absorption liquid absorbs carbon dioxide, a carbon dioxide-rich solution is formed, and it is discharged from the absorption tower through the absorption liquid discharge port arranged at the bottom of the absorption tower, and then transported to the anode liquid inlet. The absorption exhaust port is arranged at the top of the absorption tower, after the flue gas and the carbon dioxide absorption liquid fully react, the flue gas decarbonated is discharged from the absorption tower through the absorption exhaust port at the top of the absorption tower.

[0050] The anode liquid inlet of the anode chamber 201 is arranged at the bottom of the anode chamber 201, and the anode liquid outlet of the anode chamber 201 is arranged at the top of the anode chamber 201, so as to discharge the carbon dioxide, oxygen and liquid mixture. The cathode liquid inlet of the cathode chamber 202 is arranged at the bottom of the cathode chamber 202, and the cathode liquid outlet of the cathode chamber 202 is arranged at the top of the cathode chamber 202, so as to discharge the hydrogen and liquid mixture.

[0051] The second gas-liquid separation device 40 is a gas-liquid separator, the separation liquid inlet of the gas-liquid separator is arranged at the bottom of the gas-liquid separator, the separation liquid discharge port is arranged at the middle or lower part of the gas-liquid separator, and the separation exhaust port is arranged at the top of the gas-liquid separator to facilitate the escape of hydrogen.

[0052] In some embodiments of the present disclosure, the first gas-liquid separation device 30 includes: a flash tank 31 and a condenser 32. Specifically, the flash tank 31 has a flash liquid inlet, a flash liquid discharge port, a flash gas outlet and a flash liquid return port. The flash liquid discharge port is arranged at the bottom of the flash tank 31, and the flash liquid discharge port is arranged at the top of the flash tank 31. The condenser 32 has a condensation air inlet, a condensation liquid discharge port and a condensation gas outlet. The condensation gas outlet is arranged at the top of the condenser tube, and the condensation liquid discharge port is arranged at the bottom of the condenser 32. The flash liquid inlet is connected to each anode liquid discharge port, the flash gas outlet is connected to the condensation air inlet, the condensation liquid discharge port is connected to the liquid return port of the flash tank 31, the flash liquid discharge port is connected to each cathode liquid inlet, and the condensation gas outlet is used to discharge carbon dioxide and oxygen. Specifically, the carbon dioxide, oxygen and solution mixture discharged from the anode liquid discharge port enters the flash tank 31 through the flash liquid inlet, and obtains the flash separation liquid and the flash separation gas by flash evaporation in the flash tank 31, and the flash separation gas is discharged from the flash tank 31 through the flash exhaust port, and enters the condensation inlet of the condenser 32. After entering the condenser 32, the flash separation gas is condensed and separated into the condensation separation gas and the condensation separation liquid. Among them, the condensation separation gas is carbon dioxide and oxygen, and the condensation separation gas is discharged from the condenser 32 through the condensation exhaust port, and the condensation separation liquid is discharged from the condenser 32 through the condensation liquid discharge port, and then enters the flash tank 31 through the flash liquid return port, and the condensation separation liquid and the flash separation liquid are both discharged from the flash tank 31 through the flash liquid discharge port, and then enter the cathode chamber 202 through the cathode liquid inlet.

[0053] In some embodiments of the present disclosure, the carbon dioxide capture coupled modular electrolysis hydrogen production system 100 further includes: a desulfurization device 50, the desulfurization device 50 having a desulfurization air inlet, a desulfurization exhaust port, a desulfurization liquid inlet and a desulfurization liquid discharge port, the desulfurization air inlet is arranged at the bottom of the desulfurization device 50, the desulfurization exhaust port is arranged at the top of the desulfurization device 50, the desulfurization liquid inlet is arranged at the bottom of the desulfurization device 50, and the desulfurization liquid inlet is arranged at the top or upper part of the desulfurization device 50. The desulfurization air inlet is used to introduce flue gas, the desulfurization exhaust port is connected to the absorption air inlet, the desulfurization liquid inlet is used to introduce a desulfurization solution, and the desulfurization liquid discharge port is used to discharge a sulfur-containing solution.

[0054] Specifically, the flue gas enters the desulfurization device 50 from the desulfurization air inlet, the desulfurization liquid inlet transports the desulfurization solution to the desulfurization device 50, the desulfurization solution is sprayed into the desulfurization device 50 from the top or upper part of the desulfurization device 50, and fully reacts with the flue gas entering the desulfurization device 50 from the bottom to desulfurize the flue gas. The desulfurized flue gas is discharged from the desulfurization device 50 through the desulfurization exhaust port, and enters the absorption device 10 through the absorption air inlet, and the carbon dioxide in the desulfurized flue gas is absorbed by the absorption device 10.

[0055] In some embodiments of the present disclosure, the carbon dioxide capture coupled modular electrolysis hydrogen production system 100 further includes: a removal device 60, the removal device 60 has a removal gas inlet, a removal liquid inlet and a removal liquid discharge port, the removal gas inlet is arranged at the bottom of the desulfurization device 50, the desulfurization liquid inlet is arranged at the top or upper part of the desulfurization device 50, and the desulfurization liquid discharge port is arranged at the bottom of the desulfurization device 50. The removal gas inlet is connected to the absorption exhaust port, the removal liquid inlet is used to introduce the removal solution, the removal liquid discharge port is used to discharge the solution removed by absorbing ammonia, organic amine or amino acid salt, and the removal device 60 is used to absorb at least one of ammonia, organic amine and amino acid salt.

[0056] Specifically, after the absorption device 10 absorbs the carbon dioxide in the flue gas, the absorption device 10 discharges the flue gas decarbonated from the absorption device 10 through the absorption exhaust port, and transports the flue gas decarbonated to the removal device 60 through the removal air inlet, and the removal solution enters the removal device 60 through the removal liquid inlet, and sprays the inside of the removal device 60 by spraying, and the removal solution fully reacts with the flue gas decarbonated to absorb the ammonia in the flue gas to achieve the purpose of removal. The flue gas after removal is discharged from the removal device 60 through the removal exhaust port, and the removal solution that absorbs ammonia is discharged from the removal device 60 through the removal liquid discharge port.

[0057] In some embodiments of the present disclosure, the removal liquid outlet is connected to the desulfurization liquid inlet. The removal solution that has absorbed ammonia is discharged from the removal device 60 through the removal liquid outlet, and then enters the desulfurization liquid inlet of the desulfurization device 50. The removal solution that has absorbed ammonia can desulfurize the flue gas, that is, the removal solution that has absorbed ammonia is used as a desulfurization solution to desulfurize the flue gas, reducing the additional desulfurization solution added in the desulfurization device 50, and realizing the effective utilization and circulation of resources.

[0058] In some embodiments of the present disclosure, the removal device 60 further includes a removal liquid return port, and the desulfurization liquid discharge port is connected to the removal liquid return port. When the desulfurization solution is in an unsaturated state after absorbing sulfur in the flue gas, the unsaturated desulfurization solution is transported to the removal liquid inlet by the desulfurization liquid discharge port and enters the removal device 60. After the desulfurization solution absorbs ammonia, the unsaturated desulfurization solution is transported to the desulfurization liquid inlet together with the desulfurization solution that has absorbed ammonia through the removal liquid discharge port, so that the unsaturated desulfurization solution absorbs sulfur in the flue gas.

[0059] In some embodiments of the present disclosure, the carbon dioxide capture-coupled modular electrolysis hydrogen production system 100 also includes: a first heat exchange device 70, which is arranged between the removal device 60 and the separation device, wherein the first heat exchange device 70 has a first cold end 71 and a first hot end 72, the inlet of the first cold end 71 is connected to the removal drainage port, and the outlet of the first hot end 72 is connected to the desulfurization inlet port, the removal solution that absorbs ammonia enters the inlet of the first cold end 71 through the removal drainage port, and is discharged from the outlet of the first hot end 72 to the desulfurization inlet port, the inlet of the first hot end 72 is connected to the desulfurization drainage port, and the outlet of the first cold end 71 is connected to the removal return liquid port, the desulfurization solution that absorbs sulfur enters the inlet of the first hot end 72 through the desulfurization drainage port, and is discharged from the outlet of the first cold end 71 to the removal return liquid port, and enters the removal device 60. The desulfurization solution that has absorbed sulfur transfers heat to the removal solution that has absorbed ammonia through the first heat exchange device 70, so as to increase the temperature of the removal solution that has absorbed ammonia and reduce the temperature of the desulfurization solution that has absorbed sulfur.

[0060] In some embodiments of the present disclosure, the carbon dioxide capture coupled modular electrolysis hydrogen production system 100 further includes: a recovery device 80, the recovery device 80 has a recovery liquid inlet, and the recovery liquid inlet is connected to the desulfurization liquid outlet of the desulfurization device 50. When the desulfurization solution in the desulfurization device 50 reaches saturation, the desulfurization solution in the desulfurization device 50 is transported to the recovery device 80 for treatment to obtain a sulfur dioxide product.

[0061] In some embodiments of the present disclosure, the carbon dioxide capture-coupled modular hydrogen production electrolysis system 100 also includes: a second heat exchange device 90, which is arranged between the absorption device 10 and the hydrogen production electrolysis device 20, wherein the second heat exchange device 90 has a second cold end 91 and a second hot end 92, the inlet of the second cold end 91 is connected to the absorption drain port, the outlet of the second hot end 92 is connected to each anode liquid inlet, the inlet of the second hot end 92 is connected to the separation drain port, and the outlet of the second cold end 91 is connected to the absorption inlet.

[0062] Specifically, the carbon dioxide absorption liquid enters the inlet of the second hot end 92 through the separation drain port, and is discharged from the outlet of the second cold end 91 of the second heat exchange device 90 to the absorption inlet, and enters the absorption device 10. The carbon dioxide-rich solution that absorbs carbon dioxide enters the inlet of the second cold end 91 of the second heat exchange device 90 from the absorption drain port of the absorption device 10, and is discharged from the outlet of the second hot end 92 to the anode inlet. The carbon dioxide absorption liquid and the carbon dioxide-rich solution achieve heat exchange in the second heat exchange device 90.

[0063] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A carbon dioxide capture coupled modular electrolysis hydrogen production system, characterized in that: The carbon dioxide capture coupled modular electrolysis hydrogen production system comprises: An absorption device, wherein the absorption device contains a carbon dioxide absorption liquid, and the absorption device has an absorption air inlet, an absorption exhaust port, an absorption liquid discharge port and an absorption liquid inlet, wherein the absorption air inlet is used to introduce flue gas, and the absorption exhaust port is used to discharge the flue gas decarbonated with carbon dioxide; An electrolytic hydrogen production device, comprising a plurality of electrolytic units, each of which comprises an anode chamber and a cathode chamber isolated from each other, wherein an anode electrode is disposed in the anode chamber, and a cathode electrode is disposed in the cathode chamber, and two electrodes close to each other in two adjacent electrolytic units have opposite polarities, each of which has an anode liquid inlet and an anode liquid discharge port, each of which is connected to the absorption liquid discharge port, and each of which has a cathode liquid inlet and a cathode liquid discharge port; a first gas-liquid separation device, each of the anode drain ports being communicated with the first gas-liquid separation device, the first gas-liquid separation device being used to separate carbon dioxide, oxygen and an anode separation solution from the anode gas-liquid mixture transported by the anode drain port, and the first gas-liquid separation device being communicated with each of the cathode liquid inlets to provide the anode separation solution to the cathode chamber; The second gas-liquid separation device comprises a separation liquid inlet, a separation liquid discharge port and a separation exhaust port, wherein the separation liquid inlet is connected to each of the cathode liquid discharge ports, the separation liquid discharge port is connected to the absorption liquid inlet port, and the separation exhaust port is used to discharge hydrogen. The second gas-liquid separation device is used to separate hydrogen and the carbon dioxide absorption liquid from the cathode gas-liquid mixture transported by the cathode liquid discharge port.

2. The carbon dioxide capture coupled modular electrolysis hydrogen production system according to claim 1, characterized in that: The first gas-liquid separation device comprises: A flash tank, wherein the flash tank has a flash liquid inlet, a flash liquid discharge port, a flash gas outlet and a flash liquid return port, wherein the flash liquid inlet is connected to each of the anode liquid discharge ports, and the flash liquid discharge port is connected to each of the cathode liquid inlet; A condenser, wherein the condenser has a condensation air inlet, a condensation liquid drain port and a condensation exhaust port, wherein the condensation air inlet is connected to the flash exhaust port, the condensation liquid drain port is connected to the flash liquid return port, and the condensation exhaust port is used to discharge carbon dioxide and oxygen.

3. The carbon dioxide capture coupled modular electrolysis hydrogen production system according to claim 1, characterized in that: The carbon dioxide capture coupled modular electrolysis hydrogen production system also includes: A desulfurization device, the desulfurization device has a desulfurization air inlet, a desulfurization exhaust port, a desulfurization liquid inlet and a desulfurization liquid discharge port, the desulfurization air inlet is used to introduce flue gas, the desulfurization exhaust port is connected with the absorption air inlet, the desulfurization liquid inlet is used to introduce desulfurization solution, and the desulfurization liquid discharge port is used to discharge sulfur-containing solution.

4. The carbon dioxide capture coupled modular electrolysis hydrogen production system according to claim 3 is characterized in that: The carbon dioxide capture coupled modular electrolysis hydrogen production system also includes: A removal device, the removal device having a removal air inlet, a removal liquid inlet and a removal liquid discharge port, the removal air inlet is connected to the absorption exhaust port, the removal liquid inlet is used to introduce the removal solution, the removal liquid discharge port is used to discharge the removal solution, and the removal device is used to absorb at least one of ammonia, organic amines, and amino acid salts.

5. The carbon dioxide capture coupled modular electrolysis hydrogen production system according to claim 4, characterized in that: The removal liquid discharge port is communicated with the desulfurization liquid inlet.

6. The carbon dioxide capture coupled modular electrolysis hydrogen production system according to claim 5, characterized in that: The removal device also includes a removal liquid return port, which is connected to the desulfurization liquid discharge port.

7. The carbon dioxide capture coupled modular electrolysis hydrogen production system according to claim 6, characterized in that: The carbon dioxide capture coupled modular electrolysis hydrogen production system also includes: The first heat exchange device has a first cold end and a first hot end, the inlet of the first cold end is connected to the removal drainage port, the outlet of the first hot end is connected to the desulfurization liquid inlet, the inlet of the first hot end is connected to the desulfurization drainage port, and the outlet of the first hot end is connected to the removal liquid return port.

8. The carbon dioxide capture coupled modular electrolysis hydrogen production system according to claim 4, characterized in that: The carbon dioxide capture coupled modular electrolysis hydrogen production system also includes: A recovery device is provided with a recovery liquid inlet, and the recovery liquid inlet is connected to the desulfurization liquid discharge port.

9. The carbon dioxide capture coupled modular electrolysis hydrogen production system according to claim 1, characterized in that: The carbon dioxide capture coupled modular electrolysis hydrogen production system also includes: A second heat exchange device, wherein the second heat exchange device has a second cold end and a second hot end, the inlet of the second cold end is connected to the absorption drain port, the outlet of the second hot end is connected to each of the anode liquid inlets, the inlet of the second hot end is connected to the separation drain port, and the outlet of the second cold end is connected to the absorption liquid inlet.

10. The carbon dioxide capture coupled modular electrolysis hydrogen production system according to claim 1, characterized in that: The anode electrode in the anode chamber is an oxygen evolution electrode, and the oxygen evolution electrode is any one of a ruthenium oxide electrode, an iridium oxide electrode, a nickel-iron alloy electrode, and a nickel-iron oxide electrode; The cathode electrode in the cathode chamber is a hydrogen evolution electrode, and the hydrogen evolution electrode is any one of a platinum-carbon electrode, a platinum-ruthenium-carbon electrode, a nickel-molybdenum alloy electrode, and a nickel-molybdenum oxide electrode.

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