Device for directly capturing CO2 in air by using cooling tower

Abstract

The utility model discloses a device for directly capturing CO2 in air by using a cooling tower. The device comprises a CO2 capturing module and an electrolytic CO2 release and captured liquid regeneration module, the CO2 capture module comprises a circulating water cooling tower and a heat exchange system, the circulating water cooling tower is used for capturing CO2 in air, and the heat exchange system is a circulating water system served by the circulating water cooling tower; the CO2 electrolysis release and trapping liquid regeneration module comprises a three-chamber electrolytic tank, an acidification chamber accessory assembly, a cathode chamber accessory assembly, an electrolyte input assembly, an external hydrogen inlet and outlet assembly and power supply equipment. The circulating water cooling tower has the following advantages that on the basis that the circulating water cooling function of the cooling tower is achieved, an existing circulating water cooling tower is directly used as an air contactor to achieve direct CO2 air trapping.

Description

Technical Field

[0001] The utility model relates to the technical field of directly capturing carbon dioxide in the air, in particular to a device for directly capturing CO2 in the air by utilizing a cooling tower. Background Art

[0002] CO2 capture and storage technology (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 current main CO2 capture technologies include absorption and adsorption, which are basically aimed at thermal power, steel, cement and other industries, and belong to point source CO2 capture. When faced with CO2 produced by mobile sources such as cars, airplanes, and organisms, this model is powerless. In essence, these existing capture methods are limited by factors such as location and process. They can only reduce point source CO2 emissions and cannot effectively remove CO2 that has already been produced in the atmosphere. They fall into the category of "carbon emission reduction."

[0003] Currently, developing new technologies to capture CO2 directly from the air (Direct Air Capture, DAC) is an effective way to overcome the shortcomings of the traditional point source carbon capture model. This is also a "carbon sink" model that is different from "carbon emission reduction" and is of great significance in reducing the global atmospheric CO2 concentration. DAC can, in principle, be used with other negative carbon emission technologies to reduce CO2 emissions from various sources, including mobile and dispersed emission sources.

[0004] Air contactor is one of the core technologies of direct air capture, and it is an important device to ensure CO2 capture. Compared with flue gas capture, the CO2 content in the air is lower, which means that in the same period of time, the difference in the amount of CO2 contacted by the two is nearly 380 times. Therefore, from an engineering perspective, in order to maintain a large amount of CO2 capture, the volume and quantity of the air contactor cannot be effectively controlled. This large-scale facility that requires additional construction consumes a lot of resources and has a long cost recovery period, which is one of the important reasons restricting the development of DAC technology. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a method and device for directly capturing CO2 in the air by using a cooling tower in order to solve the above shortcomings, and to achieve the following invention purposes:

[0006] 1. On the basis of realizing the cooling function of the cooling tower, the existing circulating water cooling tower can be directly used as an air contactor to realize direct air capture of CO2;

[0007] 2. It can capture and release carbon dioxide and regenerate the captured liquid at room temperature, which can avoid the problem that the conventional CO2 release method requires heating, which conflicts with the basic function of the circulating water cooling tower (cooling circulating water); and it can realize the recycling of capture agents, maximize the reduction of agent cost investment, and has good economic benefits.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0009] A device for directly capturing CO2 in the air using a cooling tower, including a CO2 capture module and an electrolytic CO2 release and capture liquid regeneration module;

[0010] The CO2 capture module includes a circulating water cooling tower and a heat exchange system, the circulating water cooling tower is used to capture CO2 in the air, and the heat exchange system is a circulating water system served by the circulating water cooling tower;

[0011] The electrolysis CO2 release and capture liquid regeneration module includes a three-chamber electrolytic cell, an acidification chamber accessory component, a cathode chamber accessory component, an electrolyte input component, an external hydrogen inlet and outlet component, and a power supply device;

[0012] The three-chamber electrolytic cell comprises an anode chamber, an acidification chamber and a cathode chamber, the inlet of the acidification chamber is connected to an electrolyte input assembly, and a power supply device is connected to the acidification chamber and the cathode chamber;

[0013] The acidification chamber accessory assembly includes an acidification gas-liquid buffer tank, the acidification gas-liquid buffer tank is connected to the outlet of the acidification chamber through a first gas-liquid mixing pipeline, and the acidification gas-liquid buffer tank is connected to the inlet of the cathode chamber through a liquid outlet pipeline;

[0014] The cathode chamber auxiliary assembly includes a cathode gas-liquid buffer tank, which is connected to the outlet of the cathode chamber via a second gas-liquid mixing pipeline; and the cathode gas-liquid buffer tank is connected to an inlet of the anode chamber via a gas delivery pipeline;

[0015] The external hydrogen inlet and outlet assembly comprises an external hydrogen input pipeline and a hydrogen output pipeline. The external hydrogen input pipeline is connected to the inlet of the anode chamber, and the hydrogen output pipeline is connected to the outlet of the anode chamber.

[0016] Furthermore, the circulating water cooling tower comprises a cooling tower body, in which a water collecting tank, a packing layer, a spray system and a fan are arranged from bottom to top, the water collecting tank is arranged below the packing layer, the spray system is arranged above the packing layer; the fan is arranged at the air outlet at the top of the tower body;

[0017] The cooling tower body is provided with a cooling tower air inlet, and the cooling tower air inlet is between the spray system and the water collection tank;

[0018] The heat exchange system is connected with the spray system and the water collection tank through pipelines; a delivery centrifugal pump is arranged on the pipeline between the heat exchange system and the water collection tank.

[0019] Furthermore, the acidification chamber is arranged between the cathode chamber and the anode chamber, and a cathode chamber membrane electrode is arranged between the acidification chamber and the cathode chamber, and the cathode chamber membrane electrode functions to reduce water and produce hydrogen and hydroxyl, and an anode chamber membrane electrode is arranged between the acidification chamber and the anode chamber, and the anode chamber membrane electrode functions to oxidize hydrogen and provide protons to the acidification chamber.

[0020] Furthermore, the acidified gas-liquid buffer tank is connected to a gas discharge pipeline for conveying CO2, a gas control valve is provided on the gas discharge pipeline for regulating gas output, and a first liquid control valve is provided on the liquid outlet pipeline.

[0021] Furthermore, the acidification chamber accessory assembly further includes a first pressure detector, which is a pressure sensor for monitoring the pressure in the acidification gas-liquid buffer tank and the connected acidification chamber, and the first pressure detector is arranged on the upper part of the acidification gas-liquid buffer tank;

[0022] The first pressure detector is connected to the gas control valve circuit.

[0023] Furthermore, the cathode gas-liquid buffer tank is connected to a regeneration liquid discharge pipeline, the regeneration liquid discharge pipeline is connected to a CO2 capture module, a second liquid control valve is provided between the regeneration liquid discharge pipeline and the CO2 capture module; a second pressure detector is provided on the top of the cathode gas-liquid buffer tank.

[0024] Furthermore, the electrolyte input assembly includes an electrolyte input pipeline, which connects the inlet of the acidification chamber and the CO2 capture module. The electrolyte input pipeline is provided with a flow meter, a liquid inlet valve, a centrifugal pump and a pH detector.

[0025] The utility model adopts the above technical solution, and compared with the prior art, has the following technical effects:

[0026] 1. On the basis of realizing the cooling circulating water function of the cooling tower, the existing circulating water cooling tower is directly used as an air contactor to realize direct air capture of CO2.

[0027] 2. Capture and release carbon dioxide and regenerate the captured liquid at room temperature. The electrochemical method is used to release CO2 at room temperature. There is no need to repeatedly heat the water body and the renewable power system can be used. This can avoid the problem that the conventional CO2 release method requires heating, which conflicts with the basic function of the circulating water cooling tower (cooling circulating water). It can also realize the recycling of capture agents, maximize the reduction of agent cost investment, and has good economic benefits.

[0028] 3. It solves the problem of cathode hydrogen production in conventional electrolysis CO2 release technology, enables hydrogen to be utilized at the anode, and effectively reduces safety hazards in the production process.

[0029] 4. 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%.

[0030] 5. Low energy consumption and high CO2 release efficiency, CO2 release efficiency ≥95.

[0031] 6. Clean energy such as wind power generation, photovoltaic power generation, and tidal power generation can be utilized, which has good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 It is a schematic diagram of the structure of the device for directly capturing CO2 in the air by using a cooling tower in the utility model. DETAILED DESCRIPTION

[0034] Examples, such as Figure 1 As shown, a device for directly capturing CO2 in the air using a cooling tower includes a CO2 capture module and an electrolysis CO2 release and capture liquid regeneration module.

[0035] The CO2 capture module includes a circulating water cooling tower and a heat exchange system 7.

[0036] The circulating water cooling tower is used to capture CO2 in the air. The circulating water cooling tower includes a cooling tower body 1. A water collecting tank 2, a packing layer 3, a spray system 4 and a fan 5 are arranged from bottom to top in the cooling tower body 1. The water collecting tank 2 is arranged below the packing layer 3, and the spray system 4 is above the packing layer 3; the fan 5 is arranged at the air outlet at the top of the tower body.

[0037] The cooling tower body 1 is provided with a cooling tower air inlet, which is between the spray system and the water collection tank. The packing layer has a good gas-liquid exchange function, which promotes carbon dioxide capture and circulating water cooling.

[0038] The heat exchange system 7 is a circulating water system served by a circulating water cooling tower. The cooling tower body 1 cools the circulating water in the heat exchange system. The heat exchange system 7 is connected to the spray system 4 and the water collection tank 2 through a pipeline. A delivery centrifugal pump 6 is provided on the pipeline between the heat exchange system 7 and the water collection tank 2.

[0039] The electrolysis CO2 release and capture liquid regeneration module includes a three-chamber electrolytic cell, an acidification chamber accessory component, a cathode chamber accessory component, an electrolyte input component, an external hydrogen inlet and outlet component, and a power supply device.

[0040] The three-chamber electrolytic cell comprises an anode chamber 12, an acidification chamber 14 and a cathode chamber 16. The anode chamber 12 is used for an anodic oxidation reaction, the cathode chamber 16 is used for a cathode reduction reaction, and the acidification chamber 14 is used for a carbon dioxide release reaction. The acidification chamber 14 is arranged between the cathode chamber 16 and the anode chamber 12. A cathode chamber membrane electrode 15 is arranged between the acidification chamber 14 and the cathode chamber 16. The cathode chamber membrane electrode 15 functions to reduce water and generate hydrogen and hydroxide. An anode chamber membrane electrode 13 is arranged between the acidification chamber 14 and the anode chamber 12. The anode chamber membrane electrode 13 functions to oxidize hydrogen and provide protons to the acidification chamber 14.

[0041] The inlet of the acidification chamber 14 is connected to the electrolyte input component, the outlet of the acidification chamber 14 and the inlet of the cathode chamber 16 are connected to the acidification chamber auxiliary component, and the outlet of the cathode chamber 16 is connected to the cathode chamber auxiliary component; there are two inlets of the anode chamber 12, one inlet of the anode chamber 12 is connected to the cathode chamber auxiliary component, and the other inlet of the anode chamber 12 is connected to the air inlet part of the external hydrogen inlet and outlet component, and the outlet of the anode chamber 12 is connected to the air outlet part of the external hydrogen inlet and outlet component.

[0042] The acidification chamber auxiliary components separate the liquid products out of the acidification chamber 14 and output the gaseous products, while the liquid products further flow into the cathode chamber 16 and fill it up; the acidification chamber auxiliary components include an acidification gas-liquid buffer tank 17 and a first pressure detector 18; the acidification gas-liquid buffer tank 17 is used to separate the outflow products from the acidification chamber; the first pressure detector 18 is a pressure sensor used to monitor the pressure in the acidification gas-liquid buffer tank and the connected acidification chamber, and the first pressure detector 18 is arranged on the upper part of the acidification gas-liquid buffer tank 17.

[0043] The acidification gas-liquid buffer tank 17 is connected to the outlet of the acidification chamber 14 through a first gas-liquid mixing pipeline 31 , and is connected to the inlet of the cathode chamber 16 through a liquid outlet pipeline 32 , on which a first liquid control valve 20 is provided.

[0044] The acidified gas-liquid buffer tank 17 is also connected to a gas discharge pipeline 33 for conveying CO2. A gas control valve 19 is provided on the gas discharge pipeline 33 for regulating gas output.

[0045] The first pressure detector 18 is connected to the gas control valve 19 circuit, 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 closes and waits for the pressure to rise.

[0046] The cathode chamber accessory components are used to input hydrogen into the anode chamber and discharge the regenerated liquid into the CO2 capture module. 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 products flowing out of the cathode chamber 16; the second pressure detector 22 is a pressure sensor, which is used to monitor the pressure in the cathode gas-liquid buffer tank 21 and the connected anode chamber 12; the second pressure detector 22 is arranged on the top of the cathode gas-liquid buffer tank 21.

[0047] The cathode gas-liquid buffer tank 21 is connected to the outlet of the cathode chamber 16 through a second gas-liquid mixing pipeline 34; the cathode gas-liquid buffer tank 21 is connected to an inlet of the anode chamber 12 through a gas delivery pipeline 35; the cathode gas-liquid buffer tank 21 is connected to a regeneration liquid discharge pipeline 36, and a second liquid control valve 24 is provided on the regeneration liquid discharge pipeline 36.

[0048] The electrolyte input assembly includes an electrolyte input pipeline 37, which connects the inlet of the acidification chamber 14 and the CO2 capture module. The electrolyte input pipeline 37 is provided with a flow meter 11, a liquid inlet valve 10, a centrifugal pump 9 and a pH detector 8; the pH detector 8 is arranged between the water collection tank 2 and the centrifugal pump 9, and is used to detect the pH of the absorbent aqueous solution to determine whether it has reached a saturated state. The liquid inlet valve and the flow meter are connected in a circuit for synchronously controlling the liquid input and flow rate.

[0049] The external hydrogen inlet and outlet assembly includes an external hydrogen input pipeline 39 and a hydrogen output pipeline 38; the external hydrogen input pipeline 39 is connected to the inlet of the anode chamber 12, and the hydrogen output pipeline 38 is connected to the outlet of the anode chamber 12; the external hydrogen input pipeline 39 is provided with a gas flow meter and an inlet valve 26, which are respectively used to adjust the external hydrogen input flow and control the external hydrogen input, and the hydrogen output pipeline 38 is provided with an outlet valve 23.

[0050] Before the three-chamber electrolytic cell starts the electrolysis reaction to release CO2, hydrogen is input from an external hydrogen inlet and outlet assembly and other gases in the anode chamber are discharged to fill the anode chamber with hydrogen.

[0051] The power supply equipment includes a power converter and a power system; the power converter is used to convert alternating current into direct current, and the power system includes but is not limited to wind power, photovoltaic power generation, tidal power generation, nuclear power and conventional electricity; the power converter is connected to the power system, and the power converter is connected to the cathode chamber 16 and the anode chamber 12.

[0052] A method for directly capturing CO2 from the air using a cooling tower, including a CO2 capture method and an electrolytic desorption method of CO2 and a capture liquid regeneration method;

[0053] The CO2 capture method includes the following steps:

[0054] Step 1: Turn on the delivery centrifugal pump. After the CO2 capture liquid flows through the heat exchange system, it is sprayed by the spray system and flows through the packing layer from top to bottom under the action of gravity. At the same time, turn on the fan, and air enters the cooling tower body from the cooling tower air inlet and flows through the packing layer from bottom to top.

[0055] Step 2: The air flow and the CO2 capture liquid flow are fully contacted in the packing layer to capture the CO2 in the air; after repeating this process for 12-48 hours, the absorbent aqueous solution has basically reached the capture saturation state.

[0056] Step 3: Continue the capture reaction process for 48 hours, take 10 mL samples at 0, 2, 4, 6, 12, 24, 36, and 48 hours, and use a pH detector and an ion chromatograph to measure the pH and CO2 loading of the samples, respectively; if either the CO2 loading or the pH value is met, it can be judged that the absorbent aqueous solution is saturated.

[0057] Depending on the concentration of the absorbent aqueous solution, the CO2 loading after saturation is different;

[0058] The electrolytic desorption of CO2 and the capture liquid regeneration method comprises the following steps:

[0059] Step 4: Transport the captured liquid saturated with carbon dioxide to the electrolytic cell

[0060] When the pH detector detects that the pH is ≤ 9.40, open the liquid inlet valve on the electrolyte input pipeline, and use the centrifugal pump to transport the carbon dioxide saturated capture liquid (rich liquid) in turn and fill the acidification chamber and the cathode chamber. After the two chambers are filled, the saturated absorbent aqueous solution flows into the acidification gas-liquid buffer tank and covers its liquid outlet;

[0061] After the acidification chamber and cathode chamber are filled with liquid, close the liquid inlet valve on the electrolyte input pipeline and suspend the liquid supply.

[0062] Step 5, exhausting other gases from the anode chamber and cathode gas-liquid buffer tank and filling them with hydrogen;

[0063] Step 5.1, open the air inlet valve on the external hydrogen input pipeline to allow external hydrogen to be input into the anode chamber, the anode chamber is filled with hydrogen, open the air outlet valve on the hydrogen output pipeline, and the excess hydrogen is discharged from the outlet connected thereto; this process lasts for 1-10 minutes.

[0064] Step 5.2, open the second liquid control valve between the cathode gas-liquid buffer tank and the CO2 capture module, close the outlet valve on the hydrogen output pipeline, hydrogen will enter the cathode gas-liquid buffer tank, and other gases in the cathode gas-liquid buffer tank will be discharged. This process lasts for 1-10 minutes.

[0065] 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 cathode gas-liquid buffer tank, preventing hydrogen from overflowing from the outlet.

[0066] Step 6, electrolysis reaction

[0067] After the hydrogen is filled, close the second liquid control valve between the cathode gas-liquid buffer tank and the CO2 capture module, and the air inlet valve on the external hydrogen input pipeline; turn on the power, the electrolysis reaction starts, and after 1-3 minutes of electrolysis, open the valve on the electrolyte input assembly to resume the electrolyte supply.

[0068] Step 6.1, Anode chamber reaction

[0069] An oxidation reaction occurs in the anode chamber, and H2 is oxidized to generate protons;

[0070] The reaction formula is as follows:

[0071] H2-2 e- →2H + ;

[0072] Step 6.2 Acidification chamber reaction (release of CO2)

[0073] The protons in the anode chamber enter the acidification chamber through the anode membrane electrode and react with the capture liquid saturated with carbon dioxide. The gas product is carbon dioxide, and the liquid product is the capture liquid after the CO2 is released.

[0074] The reaction products of the acidification chamber flow into the acidification gas-liquid buffer tank. When the 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. The captured liquid after releasing CO2 enters the cathode chamber for regeneration.

[0075] 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%.

[0076] Step 6.3 Cathode chamber reaction (regeneration of capture solution)

[0077] A reduction reaction occurs in the cathode chamber to generate hydroxide and hydrogen, which is then transferred to the anode chamber to be oxidized again, thus realizing the recycling of hydrogen; the hydroxide combines with the lean solution and reacts to achieve regeneration, thus obtaining a regenerated capture solution with capture capacity;

[0078] H2 and the regenerated capture liquid flow into the cathode gas-liquid buffer tank along the pipeline. When the pressure in the cathode gas-liquid buffer tank is ≥130kPa, hydrogen is transported to the anode chamber under pressure.

[0079] The reduction reaction is as follows:

[0080] 4H2O + 4e - →4OH - +2H2.

[0081] Compared with the prior art, the utility model has the following technical effects:

[0082] 1. On the basis of realizing the cooling circulating water function of the cooling tower, the existing circulating water cooling tower is directly used as an air contactor to realize direct air capture of CO2.

[0083] 2. Capture and release carbon dioxide and regenerate the captured liquid at room temperature. The electrochemical method is used to release CO2 at room temperature. There is no need to repeatedly heat the water body and the renewable power system can be used. This can avoid the problem that the conventional CO2 release method requires heating, which conflicts with the basic function of the circulating water cooling tower (cooling circulating water). It can also realize the recycling of capture agents, maximize the reduction of agent cost investment, and has good economic benefits.

[0084] 3. It solves the problem of cathode hydrogen production in conventional electrolysis CO2 release technology, enables hydrogen to be utilized at the anode level, and effectively reduces safety hazards in the production process.

[0085] 4. 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%.

[0086] 5. Low energy consumption and high CO2 release efficiency, CO2 release efficiency ≥95.

[0087] 6. Clean energy such as wind power generation, photovoltaic power generation, and tidal power generation can be utilized, which has good economic benefits.

[0088] The electrolysis reaction parameters are as follows: the electrolysis reaction is carried out at room temperature; the current density range is 100-2000mA / cm2, and the cell voltage (electrolysis voltage) range is 0.3-30.0V.

[0089] Preferably, when the current density is 125 mA / cm2, the electrolysis voltage is about 5.0 V and the hydraulic retention time is 2 min. At this value, CO2 is almost 100% released and the energy consumption is low.

[0090] Furthermore, the CO2 capture object is carbon dioxide in the air, and the concentration of carbon dioxide in the air is about 420ppm; the initial pH value of the CO2 capture liquid is 7-10, and the optimal pH is 10, which can take into account both carbon dioxide capture and cooling tower operation at the same time, with the best effect. The pH value of the CO2 capture liquid is dynamically adjusted according to the requirements of the cooling tower;

[0091] The temperature of the captured liquid is 23-43°C (the operating temperature range of the cooling tower circulating water).

[0092] Furthermore, the CO2 capture liquid is a buffered capture liquid with a pH of 10.00, specifically an absorbent solution formed by an absorbent and circulating water from a cooling tower; wherein the absorbent is a mixture of glycine, sodium hydroxide, and sodium chloride; the concentration of the CO2 capture liquid is 1-3 mol / L; wherein the glycine concentration is 0.25-3.00 mol / L; the sodium hydroxide concentration is 0.15-1.50 mol / L; and the sodium chloride concentration is 0.50 mol / L. When the initial pH is 10.00, the proportions can be flexibly matched.

[0093] When the initial pH is 10.00, the preferred absorbent solution ratio is as follows:

[0094] The concentration of glycine is 3.00 mol / L, the concentration of sodium hydroxide is 1.50 mol / L, the concentration of sodium chloride is 0.50 mol / L, and the initial pH is 10.00. At this time, after the CO2 capture liquid captures the carbon dioxide in the air to saturation, the pH is ≈ 9.35, and the capture amount of CO2 is 0.47 mol / L.

[0095] The capture liquid has a low initial pH value while maintaining a high CO2 loading capacity, and can be used in most scenarios with strict pH restrictions. At the same time, the capture liquid is a sodium glycine buffer solution, which is green, efficient, and non-toxic. The buffered capture liquid can maintain a low pH while also having a high CO2 loading capacity, which is suitable for the pH requirements for normal operation of the cooling tower system. On the basis of ensuring the cooling circulating water function of the cooling tower, the circulating water cooling tower can be directly used as an air contactor to capture CO2 in the air.

[0096] 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 device for directly capturing CO2 from the air using a cooling tower, characterized in that: It includes a CO2 capture module and an electrolytic CO2 release and capture liquid regeneration module; The CO2 capture module comprises a circulating water cooling tower and a heat exchange system (7), wherein the circulating water cooling tower is used to capture CO2 in the air, and the heat exchange system (7) is a circulating water system served by the circulating water cooling tower; The electrolysis CO2 release and capture liquid regeneration module includes a three-chamber electrolytic cell, an acidification chamber accessory component, a cathode chamber accessory component, an electrolyte input component, an external hydrogen inlet and outlet component, and a power supply device. The three-chamber electrolytic cell is connected to the acidification chamber accessory component, the cathode chamber accessory component, the electrolyte input component, the external hydrogen inlet and outlet component, and the power supply device.

2. The device for directly capturing CO2 in the air using a cooling tower as claimed in claim 1, characterized in that: The circulating water cooling tower comprises a cooling tower body (1), wherein a water collecting tank (2), a packing layer (3), a spray system (4) and a fan (5) are arranged from bottom to top in the cooling tower body (1), wherein the water collecting tank (2) is arranged below the packing layer (3), and the spray system (4) is arranged above the packing layer (3); and the fan (5) is arranged at the air outlet at the top of the tower body; The cooling tower body (1) is provided with a cooling tower air inlet, and the cooling tower air inlet is between the spray system and the water collection tank; The heat exchange system (7) is connected to the spray system (4) and the water collection tank (2) through a pipeline; a delivery centrifugal pump (6) is provided on the pipeline between the heat exchange system (7) and the water collection tank (2).

3. The device for directly capturing CO2 in the air using a cooling tower as claimed in claim 1, characterized in that: The three-chamber electrolytic cell comprises an anode chamber (12), an acidification chamber (14) and a cathode chamber (16), wherein the acidification chamber (14) is arranged between the cathode chamber (16) and the anode chamber (12), and the acidification chamber (14) and the cathode chamber (16) are connected to a power supply device.

4. The device for directly capturing CO2 in the air using a cooling tower as claimed in claim 3, characterized in that: A cathode chamber membrane electrode (15) is arranged between the acidification chamber (14) and the cathode chamber (16), and the cathode chamber membrane electrode (15) functions to reduce water and generate hydrogen and hydroxyl radicals. An anode chamber membrane electrode (13) is arranged between the acidification chamber (14) and the anode chamber (12), and the anode chamber membrane electrode (13) functions to oxidize hydrogen and provide protons to the acidification chamber (14).

5. The device for directly capturing CO2 in the air using a cooling tower as claimed in claim 3, characterized in that: The acidification chamber auxiliary component comprises an acidification gas-liquid buffer tank (17), the acidification gas-liquid buffer tank (17) is connected to the outlet of the acidification chamber (14) via a first gas-liquid mixing pipeline (31), and the acidification gas-liquid buffer tank (17) is connected to the inlet of the cathode chamber (16) via a liquid outlet pipeline (32).

6. The device for directly capturing CO2 in the air using a cooling tower as claimed in claim 5, characterized in that: The acidified gas-liquid buffer tank (17) is connected to a gas discharge pipeline (33) for conveying CO2. The gas discharge pipeline (33) is provided with a gas control valve (19) for regulating gas output. The liquid outlet pipeline (32) is provided with a first liquid control valve (20).

7. The device for directly capturing CO2 in the air by using a cooling tower as claimed in claim 3, characterized in that: The cathode chamber auxiliary component comprises a cathode gas-liquid buffer tank (21), which is connected to an outlet of the cathode chamber (16) via a second gas-liquid mixing pipeline (34); and the cathode gas-liquid buffer tank (21) is connected to an inlet of the anode chamber (12) via a gas delivery pipeline (35).

8. The device for directly capturing CO2 in the air using a cooling tower as claimed in claim 7, characterized in that: The cathode gas-liquid buffer tank (21) is connected to a regeneration liquid discharge pipeline (36), the regeneration liquid discharge pipeline (36) is connected to a CO2 capture module, and a second liquid control valve (24) is provided between the regeneration liquid discharge pipeline (36) and the CO2 capture module; a second pressure detector (22) is provided on the top of the cathode gas-liquid buffer tank (21).

9. The device for directly capturing CO2 in the air by using a cooling tower as claimed in claim 3, characterized in that: The external hydrogen inlet and outlet assembly comprises an external hydrogen input pipeline (39) and a hydrogen output pipeline (38), wherein the external hydrogen input pipeline (39) is connected to the inlet of the anode chamber (12), and the hydrogen output pipeline (38) is connected to the outlet of the anode chamber (12). The external hydrogen input pipeline (39) is provided with a gas flow meter and an inlet valve (26) for adjusting the external hydrogen input flow and controlling the external hydrogen input, respectively, and the hydrogen output pipeline (38) is provided with an outlet valve (23).

10. The device for directly capturing CO2 in the air by using a cooling tower as claimed in claim 3, characterized in that: The electrolyte input assembly comprises an electrolyte input pipeline (37), the electrolyte input pipeline (37) is connected to the inlet of the acidification chamber (14) and the CO2 capture module, and the electrolyte input pipeline (37) is provided with a flow meter (11), a liquid inlet valve (10), a centrifugal pump (9) and a pH detector (8).

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