Modularized carbon dioxide pregnant solution electrochemical desorption regeneration device

Abstract

The utility model discloses a modularized carbon dioxide pregnant solution electrochemical desorption regeneration device which comprises an electrolytic tank group, an acidification chamber accessory assembly, a cathode chamber accessory assembly and an electrolyte input assembly, and the electrolytic tank group is connected with the acidification chamber accessory assembly, the cathode chamber accessory assembly and the electrolyte input assembly; the electrolytic tank group comprises a plurality of three-chamber electrolytic tanks which are connected in parallel, each three-chamber electrolytic tank comprises an anode chamber, an acidification chamber and a cathode chamber, and the acidification chamber is arranged between the cathode chamber and the anode chamber. The device has the following advantages that an equipment pile body can be formed in a single body combination mode, and the device has the advantages of being convenient to install and transport, small in occupied area, low in construction cost and capable of being connected into a renewable power system.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide rich liquid desorption and regeneration, in particular to a modular carbon dioxide rich liquid electrochemical desorption and regeneration device. Background Art

[0002] Carbon Capture, Utilization and Storage (CCUS) refers to the removal of CO2 from the atmosphere through various methods and storing it underground or in other media to reduce its impact on climate change. The main CO2 capture technologies currently include absorption and adsorption, which are basically aimed at thermal power, steel, cement and other industries, and belong to point source CO2 capture.

[0003] Absorption is a technology that uses chemical absorbents to absorb CO2 from the air into liquid for treatment and storage. CO2 is fixed to the absorbent aqueous solution to form a CO2-rich liquid. Subsequently, the CO2-rich liquid will enter the corresponding analytical device to release CO2 and achieve regeneration. However, there are some shortcomings in the current analytical devices. Taking monoalcohol amine absorbent as an example, its CO2 release and absorbent regeneration process usually requires a large stripping tower, and the reaction can only be carried out effectively at 80-120°C; while inorganic alkali absorbents such as potassium hydroxide require a series of large and complex devices such as particle reactors, separation devices, and calciners. Finally, CO2 can be obtained after high-temperature calcination, and the calcination temperature is generally above 900°C. Most of these devices occupy a large area and have high construction and operation costs, and the CO2 release process has high energy consumption. In addition, these devices are difficult to couple with renewable energy, maintenance is troublesome, and it is difficult to upgrade and move after construction. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a modular carbon dioxide rich liquid electrochemical desorption and regeneration device in view of the above shortcomings. The device can be composed of a device stack by combining monomers, and has the advantages of convenient installation and transportation, small footprint, low construction cost, and access to renewable power systems.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A modular carbon dioxide rich liquid electrochemical desorption regeneration device comprises an electrolytic cell group, an acidification chamber accessory component, a cathode chamber accessory component and an electrolyte input component, wherein the electrolytic cell group is connected to the acidification chamber accessory component, the cathode chamber accessory component and the electrolyte input component;

[0007] The electrolytic cell group comprises a plurality of three-chamber electrolytic cells connected in parallel, wherein the three-chamber electrolytic cells comprise an anode chamber, an acidification chamber and a cathode chamber, wherein the acidification chamber is arranged between the cathode chamber and the anode chamber.

[0008] Furthermore, a cathode chamber membrane electrode is arranged between the acidification chamber and the cathode chamber, and an anode chamber membrane electrode is arranged between the acidification chamber and the anode chamber.

[0009] Furthermore, the acidification chamber auxiliary components include an acidification gas-liquid buffer tank and a first pressure detector, the inlet of the acidification gas-liquid buffer tank is connected to the acidification chamber, and the outlet of the acidification gas-liquid buffer tank is connected to the cathode chamber; the first pressure detector is a pressure sensor, and the first pressure detector is arranged on the upper part of the acidification gas-liquid buffer tank.

[0010] Furthermore, the inlet of the acidified gas-liquid buffer tank is connected to the first gas-liquid mixing main pipe, and the outlet of the acidification chamber is connected to the first gas-liquid mixing main pipe through the first gas-liquid mixing branch pipe; the outlet of the acidified gas-liquid buffer tank is connected to the liquid outlet main pipe, and the inlet of the cathode chamber of the three-chamber electrolytic cell is connected to the liquid outlet main pipe through the liquid outlet branch pipe, and a liquid control valve is provided on the liquid outlet branch pipe.

[0011] Furthermore, the acidified gas-liquid buffer tank is connected to a gas discharge pipeline for conveying CO2, and a gas control valve is arranged on the gas discharge pipeline for regulating gas output.

[0012] Furthermore, the first pressure detector is connected to a gas control valve circuit on a gas exhaust pipeline.

[0013] Furthermore, the cathode chamber accessory component includes a cathode gas-liquid buffer tank and a second pressure detector, the inlet of the cathode gas-liquid buffer tank is connected to the cathode chamber, the outlet of the cathode gas-liquid buffer tank is connected to the anode chamber, and the second pressure detector is a pressure sensor, which is arranged on the top of the cathode gas-liquid buffer tank.

[0014] Furthermore, the inlet of the cathode gas-liquid buffer tank is connected to a second gas-liquid mixing main pipe, and the outlet of the cathode chamber is connected to the second gas-liquid mixing main pipe through a second gas-liquid mixing branch pipe; the outlet of the cathode gas-liquid buffer tank is connected to a gas delivery main pipe, and the gas inlet of the anode chamber is connected to the gas delivery main pipe through a gas delivery branch pipe.

[0015] Furthermore, the cathode gas-liquid buffer tank is also connected to a regeneration liquid discharge pipeline, and a liquid control valve is provided on the regeneration liquid discharge pipe.

[0016] Furthermore, the electrolyte input assembly includes an electrolyte input main pipe, and the acidification chamber inlet is connected to the electrolyte input main pipe through an electrolyte input branch pipe.

[0017] The utility model adopts the above technical solution, and compared with the prior art, has the following technical effects:

[0018] 1. The utility model can form a device stack by combining monomers, which has the advantages of convenient installation and transportation, small footprint, low construction cost, and access to renewable power systems.

[0019] 2. It solves the problem of cathode hydrogen production in CO2 release technology of conventional electrolysis equipment, enables hydrogen to be utilized at the anode, and effectively reduces safety hazards in the production process.

[0020] 3. The problem of low purity of carbon dioxide caused by releasing carbon dioxide in the anode chamber in the prior art is avoided. The utility model can greatly improve the purity of CO2, and the purity of CO2 is ≥98%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0022] Figure 1 It is a structural schematic diagram of the modular carbon dioxide rich liquid electrochemical desorption and regeneration device in the utility model. DETAILED DESCRIPTION

[0023] Embodiment 1, as Figure 1 As shown, a modular carbon dioxide rich liquid electrochemical desorption and regeneration device includes an electrolytic cell group, an acidification chamber accessory component, a cathode chamber accessory component, and an electrolyte input component.

[0024] The electrolytic cell group includes a plurality of three-chamber electrolytic cells 1 connected in parallel, and the three-chamber electrolytic cells 1 include an anode chamber 11, an acidification chamber 12 and a cathode chamber 13. The anode chamber 11 is used for an anodic oxidation reaction, the cathode chamber 13 is used for a cathode reduction reaction, and the acidification chamber 12 is used for a carbon dioxide release reaction. The acidification chamber 12 is arranged between the cathode chamber 13 and the anode chamber 11, and a cathode chamber membrane electrode 15 is arranged between the acidification chamber 12 and the cathode chamber 13. The cathode chamber membrane electrode 15 functions to reduce water and generate hydrogen and hydroxide. The anode chamber membrane electrode 14 is arranged between the acidification chamber 12 and the anode chamber 11. The anode chamber membrane electrode 14 functions to oxidize hydrogen and provide protons to the acidification chamber 12.

[0025] The acidification chamber auxiliary components separate the liquid products from the acidification chamber and output the gas products, while the liquid products further flow into the cathode chamber and fill it up; the acidification chamber auxiliary components include an acidification gas-liquid buffer tank 17 and a first pressure detector 18, the inlet of the acidification gas-liquid buffer tank 17 is connected to the acidification chamber 12, and the outlet of the acidification gas-liquid buffer tank 17 is connected to the cathode chamber 13, and the acidification gas-liquid buffer tank 17 is used to separate the products flowing out of the acidification chamber 12; the first pressure detector is a pressure sensor, which is used to monitor the pressure in the acidification gas-liquid buffer tank and the connected acidification chamber; the first pressure detector 18 is arranged on the upper part of the acidification gas-liquid buffer tank 17.

[0026] The inlet of the acidified gas-liquid buffer tank 17 is connected to the first gas-liquid mixing main pipe 2, and the outlet of the acidification chamber 12 is connected to the first gas-liquid mixing main pipe 2 through the first gas-liquid mixing branch pipe 3; the outlet of the acidified gas-liquid buffer tank 17 is connected to the liquid outlet main pipe 4, and the inlet of the cathode chamber 13 of the three-chamber electrolytic cell is connected to the liquid outlet main pipe 4 through the liquid outlet branch pipe 5, and the liquid outlet branch pipe 5 is provided with a liquid control valve 20.

[0027] The acidified gas-liquid buffer tank 17 is connected to a gas discharge pipeline 6 for conveying CO2. A gas control valve 19 is provided on the gas discharge pipeline 6 for regulating gas output.

[0028] The first pressure detector 18 is circuit-connected to the gas control valve 19 on the gas exhaust pipeline 6, and is used to monitor and adjust the pressure in the acidification gas-liquid buffer tank in real time, and control the output flow rate of the gas product; when the pressure in the acidification gas-liquid buffer tank is ≥130kPa, the gas control valve opens and starts to transport CO2. When the pressure is less than this value, the gas control valve 19 closes and waits for the pressure to rise.

[0029] The cathode chamber accessory components are used to input hydrogen into the anode chamber and discharge the regenerated liquid into the CO2 capture device. The cathode chamber accessory components include a cathode gas-liquid buffer tank 21 and a second pressure detector 22. The cathode gas-liquid buffer tank 21 is used to separate the cathode chamber effluent product. The inlet of the cathode gas-liquid buffer tank 21 is connected to the cathode chamber 13, and the outlet of the cathode gas-liquid buffer tank 21 is connected to the anode chamber 11. The second pressure detector 22 is a pressure sensor for monitoring the pressure in the cathode gas-liquid buffer tank 21 and the connected anode chamber 11. The second pressure detector 22 is arranged on the top of the cathode gas-liquid buffer tank 21.

[0030] The inlet of the cathode gas-liquid buffer tank 21 is connected to the second gas-liquid mixing main pipe 7, and the outlet of the cathode chamber 13 is connected to the second gas-liquid mixing main pipe 7 through the second gas-liquid mixing branch pipe 8; the outlet of the cathode gas-liquid buffer tank 21 is connected to the gas delivery main pipe 9, and the gas inlet of the anode chamber is connected to the gas delivery main pipe 9 through the gas delivery branch pipe 10; the cathode gas-liquid buffer tank 21 is also connected to a regeneration liquid discharge pipeline 23, and a liquid control valve is provided on the regeneration liquid discharge pipeline 23. The regeneration liquid discharge pipeline 23 is connected to the CO2 capture device, and the regeneration liquid flows into the CO2 capture device again.

[0031] The electrolyte input assembly is used to input electrolyte into the electrolytic cell to release CO2. The electrolyte input assembly includes an electrolyte input main pipe 24, which is connected to the CO2 capture device. The inlet of the acidification chamber 12 is connected to the electrolyte input main pipe 24 through an electrolyte input branch pipe 25.

[0032] The captured liquid saturated with carbon dioxide is respectively transported to the acidification chamber and the cathode chamber of each electrolytic cell unit in the modular device;

[0033] Discharge other gases from the anode chamber and cathode gas-liquid buffer tank of each electrolytic cell unit in the modular device and fill them with hydrogen;

[0034] During the process of inputting hydrogen into the cathode gas-liquid buffer tank, there is a certain amount of electrolyte inside it, and the liquid level of this part of the electrolyte is above the outlet of the total cathode gas-liquid buffer tank, preventing hydrogen from overflowing from this outlet.

[0035] After the hydrogen is filled, turn on the power and the electrolysis reaction begins. After 1 to 3 minutes of electrolysis, open the valve on the electrolyte input pipeline to resume the electrolyte supply.

[0036] An oxidation reaction occurs in the anode chamber of each electrolytic cell unit in the modular device, and H2 is oxidized to generate protons;

[0037] The reaction formula is as follows:

[0038] H2-2e-→2H+;

[0039] The protons in the anode chamber of each electrolytic cell unit in the modular device enter the acidification chamber of each electrolytic cell unit in the modular device through the anode membrane electrode, and react with the capture liquid saturated with carbon dioxide (rich liquid). The gas product is carbon dioxide, and the liquid product is the capture liquid after releasing CO2 (lean liquid).

[0040] The reaction products of the acidification chamber of each electrolytic cell unit in the modular device flow into the acidification gas-liquid buffer tank. When the total pressure in the acidification gas-liquid buffer tank is ≥130kPa, the gas control valve on the gas discharge pipeline opens, and CO2 is output and collected. When the pressure is lower than this value, the gas control valve closes and waits for the pressure to rise, and the lean liquid enters the cathode chamber of each electrolytic cell unit in the modular device for regeneration.

[0041] After the reaction starts, the gas product composition is detected every 20 minutes. As the reaction proceeds, the purity of CO2 gradually increases, and the purity of the final product CO2 is ≥98%.

[0042] A reduction reaction occurs in the cathode chamber of each electrolytic cell unit in the modular device to generate hydroxide and hydrogen, and the hydrogen is transmitted to the anode chamber of each electrolytic cell unit in the modular device to be oxidized again, thereby realizing the recycling of hydrogen; the hydroxide and the lean solution combine and react to achieve regeneration, thereby obtaining a regenerated capture solution with capture capacity;

[0043] H2 and the regenerated capture liquid flow into the cathode gas-liquid buffer tank through the pipeline. When the pressure in the cathode gas-liquid buffer tank is ≥130kPa, hydrogen is transported to the anode chamber of each electrolytic cell unit in the modular device under pressure.

[0044] The reduction reaction is as follows:

[0045] 4H2 O+4e-→4OH-+2H 2 .

[0046] The description of the present invention is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present invention to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A modular carbon dioxide rich liquid electrochemical desorption and regeneration device, characterized in that: It includes an electrolytic cell group, an acidification chamber accessory component, a cathode chamber accessory component and an electrolyte input component, wherein the electrolytic cell group is connected to the acidification chamber accessory component, the cathode chamber accessory component and the electrolyte input component; The electrolytic cell group comprises a plurality of three-chamber electrolytic cells (1) connected in parallel, wherein the three-chamber electrolytic cells (1) comprise an anode chamber (11), an acidification chamber (12) and a cathode chamber (13), wherein the acidification chamber (12) is arranged between the cathode chamber (13) and the anode chamber (11).

2. A modular carbon dioxide rich liquid electrochemical desorption regeneration device as claimed in claim 1, characterized in that: A cathode chamber membrane electrode (15) is arranged between the acidification chamber (12) and the cathode chamber (13), and an anode chamber membrane electrode (14) is arranged between the acidification chamber (12) and the anode chamber (11).

3. A modular carbon dioxide rich liquid electrochemical desorption regeneration device according to claim 1, characterized in that: The acidification chamber auxiliary component comprises an acidification gas-liquid buffer tank (17) and a first pressure detector (18); the inlet of the acidification gas-liquid buffer tank (17) is connected to the acidification chamber (12), and the outlet of the acidification gas-liquid buffer tank (17) is connected to the cathode chamber (13); the first pressure detector is a pressure sensor, and the first pressure detector (18) is arranged on the upper part of the acidification gas-liquid buffer tank (17).

4. A modular carbon dioxide rich liquid electrochemical desorption regeneration device as claimed in claim 3, characterized in that: The inlet of the acidified gas-liquid buffer tank (17) is connected to a first gas-liquid mixing main pipe (2), and the outlet of the acidified chamber (12) is connected to the first gas-liquid mixing main pipe (2) through a first gas-liquid mixing branch pipe (3); the outlet of the acidified gas-liquid buffer tank (17) is connected to a liquid outlet main pipe (4), and the inlet of the cathode chamber (13) of the three-chamber electrolytic cell is connected to the liquid outlet main pipe (4) through a liquid outlet branch pipe (5), and a liquid control valve (20) is provided on the liquid outlet branch pipe (5).

5. A modular carbon dioxide rich liquid electrochemical desorption regeneration device as claimed in claim 3, characterized in that: The acidified gas-liquid buffer tank (17) is connected to a gas discharge pipeline (6) for conveying CO2. A gas control valve (19) is provided on the gas discharge pipeline (6) for regulating gas output.

6. A modular carbon dioxide rich liquid electrochemical desorption and regeneration device as claimed in claim 5, characterized in that: The first pressure detector (18) is connected to a gas control valve (19) on the gas exhaust pipeline (6) in an electrical circuit.

7. A modular carbon dioxide rich liquid electrochemical desorption regeneration device as claimed in claim 1, characterized in that: The cathode chamber auxiliary component comprises a cathode gas-liquid buffer tank (21) and a second pressure detector (22); the inlet of the cathode gas-liquid buffer tank (21) is connected to the cathode chamber (13); the outlet of the cathode gas-liquid buffer tank (21) is connected to the anode chamber (11); the second pressure detector (22) is a pressure sensor, and the second pressure detector (22) is arranged on the top of the cathode gas-liquid buffer tank (21).

8. A modular carbon dioxide rich liquid electrochemical desorption regeneration device as claimed in claim 7, characterized in that: The inlet of the cathode gas-liquid buffer tank (21) is connected to a second gas-liquid mixing main pipe (7), and the outlet of the cathode chamber (13) is connected to the second gas-liquid mixing main pipe (7) via a second gas-liquid mixing branch pipe (8); the outlet of the cathode gas-liquid buffer tank (21) is connected to a gas delivery main pipe (9), and the gas inlet of the anode chamber is connected to the gas delivery main pipe (9) via a gas delivery branch pipe (10).

9. A modular carbon dioxide rich liquid electrochemical desorption and regeneration device as claimed in claim 7, characterized in that: The cathode gas-liquid buffer tank (21) is also connected to a regeneration liquid discharge pipeline (23), and a liquid control valve is provided on the regeneration liquid discharge pipeline (23).

10. A modular carbon dioxide rich liquid electrochemical desorption regeneration device as claimed in claim 1, characterized in that: The electrolyte input assembly comprises an electrolyte input main pipe (24), and the inlet of the acidification chamber (12) is connected to the electrolyte input main pipe (24) via an electrolyte input branch pipe (25).

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