Carbon dioxide capture method and gas absorption system

Abstract

The present invention provides a carbon dioxide capture method and a gas absorption system. The carbon dioxide capture method includes the steps of: spraying an alkaline solution by a first spray structure to absorb carbon dioxide gas; temporarily storing the chemically reacted solution by a first temporary storage structure and allowing it to flow out by the first spray structure; detecting in real time the hydroxide ion concentration and / or carbonate ion concentration in the solution in the first temporary storage structure, and replenishing the first temporary storage structure with an alkaline solution or water based on the hydroxide ion concentration and carbonate ion concentration; and when it is detected in the process of detecting in real time the hydroxide ion concentration and / or carbonate ion concentration in the solution in the first temporary storage structure that the hydroxide ion concentration is m or less and the carbonate ion concentration is n, controlling the first pump or the third pump to stop operating, and putting the solution temporarily stored in the first temporary storage structure into an electrolysis device for electrolysis. The present invention solves the problem that it is difficult to control the carbon dioxide gas capture efficiency and the overall energy consumption of the carbon dioxide capture system in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture, and specifically to a carbon dioxide capture method and a gas absorption system.

Background Art

[0002] Currently, the mainstream CO2 capture methods at home and abroad mainly include liquid amine adsorption method, solid membrane adsorption method, etc. However, the above capture methods can only capture high-concentration CO2 and cannot capture CO2 in a wide concentration range. For example, they cannot capture low-concentration CO2 in the air.

[0003] In the prior art, in order to solve the above problems, a method of using an inorganic alkali such as potassium hydroxide as a liquid absorbent is used to simultaneously capture carbon sources in a wide concentration range such as air and flue gas. After capture, the inorganic alkali solution is converted into an aqueous carbonate solution, and the alkali solution can be regenerated by an electrolysis method.

[0004] However, in the electrolysis process, whether the concentration of the carbonate is too high or too low, the voltage of the electrolytic cell will increase, and the energy consumption of the system will increase. Regarding the residual inorganic alkali, if the concentration of the residual alkali solution is too high, first all the hydroxide ions in the inorganic alkali will be consumed, and then the carbonate can be electrolyzed, so a large amount of electricity costs will be consumed. If the concentration of the residual alkali solution is too low, the capture efficiency of carbon dioxide gas in the capture process cannot be effectively guaranteed. Therefore, in the prior art carbon dioxide gas capture system, it is difficult to control the capture efficiency of carbon dioxide gas and the overall energy consumption.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The main object of the present application is to provide a carbon dioxide capture method and a gas absorption system to solve the problem that it is difficult to control the capture efficiency of carbon dioxide gas and the overall energy consumption of the carbon dioxide gas capture system in the prior art.

Means for Solving the Problem

[0006] To achieve the above object, one aspect of the present application provides a carbon dioxide capture method. The carbon dioxide capture method includes spraying an alkaline solution by a first spray structure so that the alkaline solution flowing out of the first spray structure chemically reacts with carbon dioxide gas in the gas to absorb the carbon dioxide gas; temporarily storing the solution that has chemically reacted with the carbon dioxide gas by a first temporary storage structure, and flowing out the solution temporarily stored in the first temporary storage structure by the first spray structure; detecting in real time the hydroxide ion concentration and / or carbonate ion concentration in the solution in the first temporary storage structure, and replenishing the first temporary storage structure with an alkaline solution or water based on the hydroxide ion concentration and carbonate ion concentration; and in the process of detecting in real time the hydroxide ion concentration and / or carbonate ion concentration in the solution in the first temporary storage structure, when it is detected that the hydroxide ion concentration is m or less and the carbonate ion concentration is n, controlling the first pump or the third pump to stop operating, and putting the solution temporarily stored in the first temporary storage structure into an electrolysis device for electrolysis.

[0007] Furthermore, the method of flowing out the solution temporarily stored in the first temporary storage structure by the first spray structure includes starting the first pump or the third pump, and pumping the solution temporarily stored in the first temporary storage structure into the first spray structure from the pipeline by the first pump or the third pump.

[0008] Furthermore, the method of replenishing the first temporary storage structure with an alkaline solution or water based on the hydroxide ion concentration and / or carbonate ion concentration includes replenishing the first temporary storage structure with an alkaline solution when it is detected that the hydroxide ion concentration is less than m and the carbonate ion concentration is less than n; and replenishing the first temporary storage structure with water when it is detected that the hydroxide ion concentration is m or less and the carbonate ion concentration is greater than n.

[0009] Furthermore, the method for detecting the hydroxide ion concentration in the solution within the first temporary storage structure in real time is to feed the solution into a potentiometric titration apparatus, and H + drop a standard acid with calibrated H concentration into the solution. During the titration process, continuously stir and record the volume of the added standard acid and the first derivative curve of the solution potential. Do this until the first derivative curve of the solution potential reaches the first peak value, and calculate the hydroxide ion concentration of the solution with the volume of the standard acid consumed up to this point.

[0010] Furthermore, the method for detecting the carbonate ion concentration in the solution within the first temporary storage structure in real time is to feed the solution into a potentiometric titration apparatus, and H + drop a standard acid with calibrated H concentration into the solution. During the titration process, continuously stir and record the volume of the added standard acid and the first derivative curve of the solution potential. Do this until the first derivative curve of the solution potential reaches the first peak value, and record the volume of the standard acid consumed up to this point as V1. Then, continue to drop a standard acid with calibrated H + concentration into the solution. During the titration process, continuously stir and record the volume of the added standard acid and the first derivative curve of the solution potential. Do this until the first derivative curve of the solution potential reaches the second peak value, and record the volume of the standard acid consumed up to this point as V2. Calculate the carbonate ion concentration of the solution with the difference between V2 and V1.

[0011] Furthermore, m is 0.1 mol / L or more and 5 mol / L or less, and / or n is 1 mol / L or more and 6 mol / L or less.

[0012] Furthermore, m is 0.3 mol / L or more and 2 mol / L or less, and / or n is 2 mol / L or more and 5.5 mol / L or less.

[0013] Furthermore, in the process of electrolyzing the solution temporarily stored in the first temporary storage structure by putting it into the electrolysis device, the carbon dioxide capture method further includes a step of adjusting the amount of electricity applied to the electrolysis device so as to control the molar ratio and / or the production amount of carbon dioxide gas and hydrogen gas per unit time in the electrolysis device.

[0014] Furthermore, the method of adjusting the amount of electricity applied to the electrolysis device includes obtaining a predetermined amount of electricity value Q applied to the electrolysis device when the molar ratio of carbon dioxide gas to hydrogen gas produced is 1, and increasing nQ (n = 1, 2, 3,..., N (N ≤ n)) to the predetermined amount of electricity value Q so as to adjust the molar ratio of carbon dioxide gas to hydrogen gas produced.

[0015] Furthermore, in the process of adjusting the molar ratio of carbon dioxide gas to hydrogen gas produced, the carbon dioxide capture method includes a step of detecting in real time the content of the electrolyte in the electrolysis device and adding an electrolyte to the electrolysis device when the content of the electrolyte is less than a predetermined value, and the electrolyte is an alkali metal sulfate, an alkali metal nitrate or an alkali metal phosphate.

[0016] Furthermore, the method of temporarily storing the solution that has chemically reacted with carbon dioxide gas by the first temporary storage structure includes a step of installing at least two first temporary storage structures and operating them by switching, each of the first temporary storage structures can selectively temporarily store the solution that has chemically reacted with carbon dioxide gas, and when the carbonate ion concentration in one of the first temporary storage structures reaches a predetermined concentration value, this first temporary storage structure is stopped and another first temporary storage structure is started to be used.

[0017] Another aspect of the present application provides a gas absorption system, which is used to absorb carbon dioxide gas in the environment and uses the carbon dioxide capture method described above. The gas absorption system includes a housing having an air inlet and an exhaust port communicating with the air inlet, where the exhaust port is located above the air inlet or the air inlet and the exhaust port are installed opposite to each other in the horizontal direction, a gas pretreatment device installed in the housing and located at the air inlet for filtering impurities in the gas entering the air inlet, and a gas absorption assembly installed in the housing and located downstream of the gas pretreatment device. The gas absorption assembly includes a first liquid supply device and a first spray structure. The first liquid supply device is used to communicate with the first spray structure to provide an alkaline solution. The alkaline solution flowing out of the first spray structure chemically reacts with the carbon dioxide gas in the gas to absorb the carbon dioxide gas.

[0018] Furthermore, the gas absorption assembly further includes a first packing material installed opposite to the exhaust port and located below the first spray structure, and a first water collector located above the first spray structure.

[0019] Furthermore, the gas absorption assembly further includes a first temporary storage structure located below the first packing material for temporarily storing the solution that has chemically reacted with the carbon dioxide gas, a first pipeline with both ends communicating with the first temporary storage structure and the first spray structure respectively, and a first pump installed on the first pipeline for pumping the solution entering the first temporary storage structure into the first spray structure.

[0020] Furthermore, the gas pretreatment device includes a second packing material installed opposite to the air inlet, a second liquid supply device, and a second spray structure located above the second packing material and communicating with the second liquid supply device.

[0021] Furthermore, the gas pretreatment device further includes a second water collector installed opposite to the second packing material. The second water collector is either one or a plurality. At least one second water collector is located on the first side of the second packing material, and at least one second water collector is located on the second side of the second packing material.

[0022] Furthermore, the gas pretreatment device further includes a second temporary storage structure located below the second filler for temporarily storing the liquid flowing out from the second filler, a second pipeline with both ends communicating with the second spraying structure and the second temporary storage structure respectively, and a second pump installed in the second pipeline for pumping the liquid entering the second temporary storage structure into the second spraying structure.

[0023] Furthermore, the second temporary storage structure includes a first temporary storage main body and a first partition plate installed in the first temporary storage main body for partitioning the inner chamber of the first temporary storage main body into a first sub-storage chamber and a second sub-storage chamber. The first sub-storage chamber is located below the second filler, the second sub-storage chamber communicates with the second pipeline, the first partition plate has an overflow hole or forms an overflow part between it and the first temporary storage main body, and the first sub-storage chamber communicates with the second sub-storage chamber through the overflow hole or the overflow part.

[0024] Furthermore, the second filler includes a plurality of first sub-filler plates, and two adjacent first sub-filler plates are alternately installed to form a flow path. On the surface of each first sub-filler plate, a turbulent flow protrusion or a turbulent flow recess located in the flow path is installed.

[0025] Furthermore, the gas absorption system further includes a filter net or a filter film located between the gas pretreatment device and the air inlet.

[0026] Furthermore, the housing has a storage chamber, and the air inlet communicates with the exhaust port through the storage chamber. The gas absorption assembly is located in the storage chamber. There is one air inlet and one gas pretreatment device, or there are a plurality of air inlets, the plurality of air inlets are installed surrounding the storage chamber, there are a plurality of gas pretreatment devices, and the plurality of gas pretreatment devices are installed in one-to-one correspondence with the plurality of air inlets.

[0027] Furthermore, the gas absorption system further includes a gas transport device installed at the exhaust port and / or the intake port and used to transport gas from the intake port to the outside of the gas absorption system, and a first detection device installed in the first temporary storage structure and used to detect the concentration of carbonate ions in the solution. When the detection value of the first detection device reaches a first predetermined concentration value, the gas transport device is controlled to stop operating.

[0028] Furthermore, the gas transport device includes a fan installed at the exhaust port and / or a compressor installed at the intake port.

[0029] Furthermore, the gas absorption system further includes a second detection device installed in the first temporary storage structure and used to detect the concentration of hydroxide ions in the solution. When the detection value of the second detection device is less than a second predetermined concentration value, the first pump is controlled to start.

[0030] Furthermore, the bottom surface of the first temporary storage structure has a flow guiding slope.

[0031] Furthermore, the gas absorption system further includes a waterwheel and a generator. The waterwheel is located below the first temporary storage structure, the liquid located in the first temporary storage structure flows to the waterwheel through the flow guiding slope, and the generator is connected to the waterwheel.

[0032] Furthermore, the gas absorption system further includes a stirring device installed in the first temporary storage structure.

[0033] Furthermore, the gas absorption system further includes a gas transport device installed at the exhaust port and / or the intake port and used to transport gas from the intake port to the outside of the gas absorption system.

[0034] Furthermore, the gas transport device includes a fan installed at the exhaust port and / or a compressor installed at the intake port.

[0035] Furthermore, the gas absorption assembly includes a third filler located below the first spray structure and a third water collector installed opposite to the third filler. The third water collector is located between the exhaust port and the third filler, or between the third filler and the gas pretreatment device.

[0036] Furthermore, the gas absorption assembly further includes a third temporary storage structure. The third temporary storage structure is located below the third filler and is used to temporarily store the solution that has chemically reacted with carbon dioxide gas. The third temporary storage structure is one, or there are multiple third temporary storage structures and multiple third temporary storage structures can be selectively used.

[0037] Furthermore, there are multiple third temporary storage structures. The gas absorption assembly includes a second main pipeline with its first end communicating with the first spray structure, multiple third branch pipelines installed in one-to-one correspondence with the multiple third temporary storage structures, and multiple second control valves installed in one-to-one correspondence with the multiple third branch pipelines. Both ends of each third branch pipeline communicate with the corresponding third temporary storage structure and the second end of the second main pipeline respectively. Each second control valve controls the opening and closing state of the corresponding third branch pipeline. At any point in time, at least one second control valve is in the open state.

[0038] Furthermore, the gas absorption assembly further includes a third detection device installed on the second main pipeline and used to detect the concentration of carbonate radicals in the solution in the second main pipeline. When the detection value of the third detection device reaches a predetermined concentration value, at least one second control valve controls the third branch pipeline corresponding to the used third temporary storage structure to be in a blocked state, and at least one other second control valve controls at least one other third temporary storage structure to be in a used state.

[0039] Furthermore, the gas absorption assembly further includes a third pump installed on the second main pipeline or the third branch pipeline and used to pump the solution that has entered the third temporary storage structure into the first spray structure.

[0040] Furthermore, the gas pretreatment device includes a fourth filler installed opposite to the air inlet, a third liquid supply device, a third spray structure located above the fourth filler and communicating with the third liquid supply device, and a fourth water collector installed opposite to the fourth filler.

[0041] Furthermore, there is one fourth water collector, or there are a plurality of fourth water collectors, and at least one fourth water collector is located on the first side of the fourth filler, and at least one fourth water collector is located on the second side of the fourth filler.

[0042] Furthermore, the gas pretreatment device further includes a fourth temporary storage structure located below the fourth filler and used for temporarily storing the liquid flowing out from the fourth filler, a third main pipeline with both ends communicating with the third spray structure and the fourth temporary storage structure respectively, and a fourth pump installed on the third main pipeline and used for pumping the liquid entering the fourth temporary storage structure into the third spray structure.

[0043] Furthermore, the fourth temporary storage structure includes a second temporary storage body and a second partition plate installed in the second temporary storage body and partitioning the inner chamber of the second temporary storage body into a third sub-storage chamber and a fourth sub-storage chamber. The third sub-storage chamber is located below the fourth filler, the fourth sub-storage chamber communicates with the third main pipeline, the second partition plate has an overflow hole or forms an overflow part with the second temporary storage body, and the third sub-storage chamber communicates with the fourth sub-storage chamber through the overflow hole or the overflow part.

[0044] Furthermore, the fourth filler includes a plurality of second sub-filler plates, and two adjacent second sub-filler plates are alternately installed to form a flow path. On the surface of each second sub-filler plate, a turbulent flow protrusion or a turbulent flow recess located in the flow path is installed.

[0045] Furthermore, the gas absorption system further includes an electrolysis device, the electrolysis device is located downstream of the first temporary storage structure, and the electrolysis device electrolyzes the carbonic acid solution discharged from the first temporary storage structure, so that the cathode of the electrolysis device generates potassium hydroxide and hydrogen gas, and the anode of the electrolysis device generates a mixed gas of oxygen gas and carbon dioxide gas. Potassium hydroxide is used for carbon dioxide absorption in the gas absorption system.

Advantages of the Invention

[0046] According to the technical solution of the present application, an alkaline solution is sprayed by the first spraying structure. Therefore, the alkaline solution flowing out of the first spraying structure chemically reacts with carbon dioxide gas in the gas to absorb the carbon dioxide gas. In the above process, the solution chemically reacted with carbon dioxide gas is temporarily stored by the first temporary storage structure, and the solution temporarily stored in the first temporary storage structure is allowed to flow out again by the first spraying structure, thereby realizing the recycling of the solution. In the process of collecting carbon dioxide gas, the hydroxide ion concentration and / or carbonate ion concentration of the solution in the first temporary storage structure is detected in real time, and an alkaline solution or water is replenished into the first temporary storage structure based on the hydroxide ion concentration and carbonate ion concentration, and the concentrations of hydroxide ions and carbonate ions in the final solution are accurately controlled by means of alkaline solution replenishment or water replenishment, so as to meet the requirements of the subsequent electrolysis process, reduce the overall energy consumption of the system, and thus solve the problem that it is difficult to control the carbon dioxide gas collection efficiency and overall energy consumption of the carbon dioxide collection system in the prior art, and improve the collection efficiency of the carbon dioxide collection system. Here, in the process of detecting the hydroxide ion concentration and / or carbonate ion concentration of the solution in the first temporary storage structure in real time, when it is detected that the concentration of hydroxide ions is m or less and the carbonate ion concentration is n, the first pump or the third pump is controlled to stop operating, and the solution temporarily stored in the first temporary storage structure is put into the electrolysis device for electrolysis.

Brief Description of the Drawings

[0047] The drawings forming a part of this application are used to provide a further understanding of this application, and the schematic embodiments and descriptions of this application are used to interpret this application and do not unduly limit this application.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0048] Unless there is a contradiction, the embodiments in this application and the configurations in the embodiments can be combined with each other. Hereinafter, this application will be described in detail in relation to the embodiments with reference to the drawings.

[0049] Unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art.

[0050] In this application, unless otherwise specified, in the orientation terms used, "upper, lower" generally relates to the direction shown in the drawings or relates to the vertical, perpendicular or gravitational direction. Similarly, for the sake of easy understanding and explanation, usually, "left, right" refers to the left and right shown in the drawings, and "inside, outside" refers to the inside and outside with respect to the contour of each member itself. However, the above orientation terms do not limit this application.

[0051] In order to solve the problems that it is difficult to collect carbon dioxide gas in a carbon dioxide gas collection system in the prior art and the overall energy consumption, the present application provides a carbon dioxide collection method and a gas absorption system.

[0052] [Example 1] As shown in FIGS. 1 and 2, the method for collecting carbon dioxide includes the following steps 。 In S1, by spraying an alkaline solution with a first spray structure, the alkaline solution flowing out from the first spray structure chemically reacts with carbon dioxide gas in the gas so that the alkaline solution absorbs the carbon dioxide gas. In S2, the solution that has chemically reacted with the carbon dioxide gas is temporarily stored by a first temporary storage structure, and the solution temporarily stored in the first temporary storage structure is allowed to flow out by the first spray structure. In S3, the hydroxide concentration and / or carbonate concentration in the solution in the first temporary storage structure is detected in real time, and an alkaline solution or water is replenished into the first temporary storage structure based on the degree of change in the hydroxide concentration and carbonate concentration. When it is detected that the hydroxide concentration is m or less and the carbonate concentration is n, the first pump or the third pump is controlled to stop operating, and the solution temporarily stored in the first temporary storage structure is put into an electrolysis device for electrolysis.

[0053] According to the technical solution of this embodiment, an alkaline solution is sprayed by the first spray structure. Therefore, the alkaline solution flowing out from the first spray structure chemically reacts with carbon dioxide gas in the gas. In the above process, the solution that has chemically reacted with carbon dioxide gas is temporarily stored by the first temporary storage structure, and the alkaline solution temporarily stored in the first temporary storage structure is made to flow out again by the first spray structure, thereby realizing the recycling of the alkaline solution. In the process of collecting carbon dioxide gas, the hydroxide concentration and / or carbonate concentration in the solution in the first temporary storage structure is detected in real time, and an alkaline solution or water is replenished into the first temporary storage structure based on the degree of change in the hydroxide concentration and carbonate concentration. The concentrations of hydroxide and carbonate in the final solution are accurately controlled by means of alkaline solution replenishment or water replenishment, so that the concentration of the reaction solution meets the requirements of the subsequent electrolysis process, reducing the overall energy consumption of the system. Therefore, the problems of difficulty in controlling the carbon dioxide gas collection efficiency and overall energy consumption of the carbon dioxide collection system in the prior art are solved, and the collection efficiency of the carbon dioxide collection system is improved. Here, in the process of detecting the hydroxide concentration and / or carbonate concentration in the solution in the first temporary storage structure in real time, when it is detected that the hydroxide concentration is m or less and the carbonate concentration is n, the first pump or the third pump is controlled to stop operating, and the solution temporarily stored in the first temporary storage structure is put into the electrolysis device for electrolysis.

[0054] The method of making the solution temporarily stored in the first temporary storage structure flow out by the first spray structure includes the step of starting the first pump or the third pump and pumping the solution temporarily stored in the first temporary storage structure from the pipeline into the first spray structure by the first pump or the third pump.

[0055] Specifically, in the process of the carbon dioxide capture system capturing carbon dioxide gas, the solution temporarily stored in the first temporary storage structure by the first pump or the third pump is pumped from the pipeline into the first spray structure, and the solution is reused, thereby realizing the recycling of the solution and avoiding waste of resources. In addition, the first pump or the third pump pumps the solution into the first spray structure to ensure that the first spray structure can spray the alkaline solution and react with CO2, further improving the spray reliability of the first spray structure and the operation reliability of the carbon dioxide capture system.

[0056] The method of replenishing the alkaline solution or water into the first temporary storage structure based on the hydroxide concentration and / or carbonate concentration is as follows. When it is detected that the hydroxide concentration is less than m and the carbonate concentration is less than n, the step of replenishing the alkaline solution into the first temporary storage structure; When it is detected that the hydroxide concentration is less than or equal to m and the carbonate concentration is greater than n, the step of replenishing water into the first temporary storage structure, is included.

[0057] Specifically, an initial alkaline solution is placed in the first temporary storage structure located at the bottom of the carbon dioxide capture system, the first pump or the third pump is started to capture carbon dioxide gas, and the hydroxide concentration and carbonate concentration in the first temporary storage structure are detected in real time. When the solution in the first temporary storage structure has a hydroxide concentration ≥ m and a carbonate concentration < n or a hydroxide concentration > m and a carbonate concentration ≥ n, the first pump or the third pump continues to operate and no related treatment is performed. When the solution in the first temporary storage structure has a hydroxide concentration < m and a carbonate concentration < n, the alkaline solution replenishing device is started to replenish the alkaline solution into the first temporary storage structure, and the hydroxide and carbonate concentrations in the first temporary storage structure are continuously detected. When the solution in the first temporary storage structure has a hydroxide concentration ≤ m and a carbonate concentration > n, the water replenishing system is started to replenish water into the first temporary storage structure, and the hydroxide and carbonate concentrations in the first temporary storage structure are continuously detected.

[0058] Optionally, a method for detecting the hydroxide concentration in the solution within the first temporary storage structure in real time is as follows: Send the solution into a potentiometric titration apparatus, and add a standard acid with calibrated H + concentration dropwise to the solution. During the titration process, while stirring, record the volume of the added standard acid and the first derivative curve of the solution potential until the first derivative curve of the solution potential reaches the first peak value. Calculate the hydroxide concentration of the solution using the volume of the standard acid consumed up to this point.

[0059] In this example, a calibrated HCl solution with an actual concentration of 0.2404 mol / L is used as the titrant, and the solution is slowly titrated until the pH is below 2. Record the change in the volume of the added standard acid and the pH of the solution. Plot the recorded volume of the added standard acid and the pH on a pH-V curve. Calculate and plot the first derivative curve of ΔpH / ΔV-V based on the recorded curve. Use the maximum value of the above first derivative as the equivalence point, and obtain the titration equivalence point volume by the first derivative. The corresponding equivalence point is EP1 shown in the standard acid volume pH-V change diagram. Calculate the OH - concentration of the solution using the equivalence point volume and concentration. The titration takes about 10 minutes from start to end.

[0060] In other embodiments not shown in the drawings, the basicity measurement of the neutral leaching process solution is utilized. Use a calibrated HCl solution with a calibrated H + concentration of 0.1107 mol / L as the titrant, and slowly titrate the solution until the pH reaches about 3. Record the change in the volume of the consumed standard acid and the pH of the solution. Plot the recorded titration volume and pH on a pH-V diagram. Calculate and plot the first derivative curve of ΔpH / ΔV-V based on the recorded curve. Use the volume of the standard acid corresponding to the maximum value of the above first derivative as the equivalence point, and obtain the titration equivalence point volume by the first derivative. The pH of the corresponding equivalence point is 5.02. Calculate the OH - concentration of the solution using the equivalence point volume and concentration. The titration takes about 10 minutes from start to end.

[0061] In other embodiments not shown in the drawings, the measurement of the basicity after acidity adjustment with a single-stage subsequent liquid is utilized. A calibrated HCl solution with an actual concentration of 0.1107 mol / L is used as the titrant, and the solution is slowly titrated until the pH reaches approximately 3.8. The change in the standard acid consumption volume and the solution pH is recorded, the recorded titration volume and pH are plotted on a pH-V diagram, a first-order numerical differential curve of ΔpH / ΔV-V is calculated and plotted based on the recorded curve, the standard acid volume corresponding to the maximum value of the above first-order numerical differential is taken as the equivalence point, and the titration equivalence point volume is obtained by the first-order numerical differential. The pH of the corresponding equivalence point is 4.42, and the OH - concentration of the solution is calculated from the equivalence point volume and concentration. The titration takes approximately 10 minutes from start to end.

[0062] In other embodiments not shown in the drawings, the standard acid used in the calibration experiment is adopted (i.e., the H of the prepared hydrochloric acid aqueous solution +Calibrate the concentration by a well-known method and implement it with reference to the national standard GB / T601-2003. This method adopts two calibrations. First, calibrate the concentration of the standard alkali, and then use the alkali standard solution with a calibrated and known concentration for the calibration of the standard acid. An example of the calibration of the alkali solution is to dry the potassium hydrogen phthalate reference substance at 105-110°C to a constant weight, dissolve 110 g of sodium hydroxide in 100 ml of carbon dioxide-free water, place it in a sealed polyethylene container, and let it stand until the solution becomes clear. Then, take 10.8 ml of the upper clear solution, add water and dilute it to 1000 ml to prepare a sodium hydroxide titrant. Weigh 0.1377 g of the potassium hydrogen phthalate reference substance dried to a constant weight, add water until it reaches 50-60 ml, and stir until it is completely dissolved. Titrate and draw with an automatic potentiometric titrator according to the same endpoint determination principle as in the above example, and obtain the titration equivalence point volume by the first-order numerical differentiation of the above figure. When the equivalence point pH is 8.81, calculate the concentration of the sodium hydroxide titrant accordingly. The titration takes about 5 minutes from start to end. Use the titrant with a calibrated concentration according to this standard to calibrate the hydrochloric acid titrant. Dilute 27 ml of hydrochloric acid to 1000 ml with water to prepare a hydrochloric acid titrant. Put 3.0000 ml of the hydrochloric acid titrant into a beaker, add water until it reaches 50-60 ml, stir for 90 seconds, then titrate and draw with an automatic potentiometric titrator according to the same endpoint determination principle as in Examples 1-3, obtain the titration equivalence point volume by the first-order numerical differentiation of the drawn figure above, and the equivalence point pH is 7.45. Calculate with the concentration of the sodium hydroxide titrant and the volume of hydrochloric acid added to obtain the concentration of the standard acid H + to obtain the concentration. The titration takes about 5 minutes from start to end.

[0063] In this embodiment, the method for detecting the carbonate concentration in the solution in the first temporary storage structure in real time is H + Drop the standard acid with a calibrated concentration into the solution. During the titration process, record the volume of the added standard acid and the first-order differential curve of the solution potential while stirring until the first-order differential curve of the solution potential reaches the first peak value. Record the volume of the standard acid consumed at this time as V1, and H +Continuously drop the standard acid with calibrated concentration into the solution. During the titration process, while continuously stirring until the first derivative curve of the solution potential reaches the second peak value, record the volume of the added standard acid and the first derivative curve of the solution potential. At this time, let the volume of the consumed standard acid be V2, and calculate the carbonate concentration of the solution by the difference between V2 and V1.

[0064] Optionally, m is not less than 0.1 mol / L and not more than 5 mol / L, and / or n is not less than 1 mol / L and not more than 6 mol / L. Thus, with the above settings, the determination of the values of m and n becomes more flexible to meet different usage needs and operating conditions.

[0065] Optionally, m is not less than 0.3 mol / L and not more than 2 mol / L, and / or n is not less than 2 mol / L and not more than 5.5 mol / L. Thus, with the above settings, the determination of the values of m and n becomes more flexible to meet different usage needs and operating conditions.

[0066] In this embodiment, m is 0.1 mol / L and n is 6 mol / L. When the alkaline solution is sprayed by the spray structure and the carbon dioxide gas in the alkaline solution and the gas flowing out of the spray structure are chemically reacted to collect the carbon dioxide gas, the hydroxide concentration and carbonate concentration in the solution in the first temporary storage structure are detected in real time. When the solution in the first temporary storage structure has a hydroxide concentration ≥ 0.1 mol / L and a carbonate concentration < 6 mol / L or a hydroxide concentration > 0.1 mol / L and a carbonate concentration ≥ 6 mol / L, the first pump or the third pump continues to operate and no related measures are taken. When the solution in the first temporary storage structure has a hydroxide concentration < 0.1 mol / L and a carbonate concentration < 6 mol / L, the alkaline solution replenishing device is activated to replenish the alkaline solution into the first temporary storage structure, and the hydroxide and carbonate concentrations in the first temporary storage structure are continuously detected. When the solution in the first temporary storage structure has a hydroxide concentration ≤ 0.1 mol / L and a carbonate concentration > 6 mol / L, the water replenishing system is activated to replenish water into the first temporary storage structure, and the hydroxide and carbonate concentrations in the first temporary storage structure are continuously detected. When it is detected that the hydroxide concentration is 0.1 mol / L or less and the carbonate concentration is 6 mol / L, the first pump or the third pump is controlled to stop operating, and the solution temporarily stored in the first temporary storage structure is put into the electrolysis device for electrolysis.

[0067] Note that the values of m and n are not limited to this and can be adjusted according to the operating conditions and usage needs.

[0068] Note that the unit kWh / kgCO2 indicates the amount of electric energy (kWh) consumed by the electrolysis device during electrolysis to generate 1 kg of CO2.

[0069] In this embodiment, during the process of putting the solution temporarily stored in the first temporary storage structure into the electrolysis device for electrolysis, the carbon dioxide capture method is further including the step of controlling the molar ratio and / or production amount of carbon dioxide gas and hydrogen gas per unit time in the electrolysis device by adjusting the amount of electricity applied to the electrolysis device.

[0070] Specifically, in the process of electrolyzing to regenerate alkali, the absorbed carbon dioxide gas is released while generating high-value-added hydrogen gas. The combination of carbon dioxide gas and hydrogen can synthesize multiple types of chemical substances, providing a good solution basis for the comprehensive utilization of carbon dioxide gas. However, the production molar ratios of carbon dioxide gas and hydrogen gas required for different chemical substances are different. In the process of regenerating inorganic alkali, it is also very necessary to control the output ratio of carbon dioxide gas and hydrogen gas by electrolysis. By adding an electrolyte component to the electrolysis device to enhance conductivity and reduce electrolysis energy consumption, hydrogen gas can be generated by further electrolyzing water after the electrolysis of carbonate is completed. Therefore, by changing the amount of electricity applied, the production molar ratio of carbon dioxide gas and hydrogen gas in the electrolysis device per unit time can be controlled, greatly improving the application range of the system.

[0071] In this embodiment, the method for adjusting the amount of electricity applied in the electrolysis device is obtaining a predetermined amount of electricity value Q applied in the electrolysis device when the production molar ratio of carbon dioxide gas and hydrogen gas is 1, and including the step of increasing nQ (n = 1, 2, 3,..., N (N ≤ n)) to the predetermined amount of electricity value Q so as to adjust the production molar ratio of carbon dioxide gas and hydrogen gas. Specifically, taking the treatment of a solution containing 1 mol of carbonate ions per unit time as an example, the electrolyte added into the electrolysis device is potassium sulfate, and the concentration of potassium sulfate at the anode is set to be 0.5 mol / L. The amount of electricity applied to the electrolysis device is controlled so that the amount of electricity obtained by a 1-mol carbonate ion solution is 53.6 A·h, and the molar ratio of carbon dioxide gas to hydrogen gas generated is 1:1. Furthermore, every time the applied amount of electricity increases by 53.6 A·h, the generated amount of carbon dioxide gas is 0, and 1 mol more of hydrogen gas is generated. That is, the molar ratio of CO2 to H2 generated per unit time becomes 1:2, whereby the output molar ratio of carbon dioxide gas to hydrogen gas can be adjusted. In this example, the amount of electricity applied to the electrolysis device is controlled so that the amount of electricity obtained by a solution containing 1 mol of carbonate ions is 54.0 A·h, and it is detected that the electric energy consumption of the electrolysis device is 3.30 kWh / kgCO2, and the molar ratio of carbon dioxide gas to hydrogen gas generated is 1:1.01.

[0072] In this example, in the process of adjusting the molar ratio of carbon dioxide gas to hydrogen gas generated, the carbon dioxide capture method is detecting the content of the electrolyte in the electrolysis device in real time, and further including the step of adding an electrolyte into the electrolysis device when the content of the electrolyte is less than a predetermined value. The electrolyte is an alkali metal sulfate, an alkali metal nitrate, or an alkali metal phosphate.

[0073] Optionally, the predetermined value is 0. Specifically, in the process of adjusting the molar ratio of carbon dioxide gas to hydrogen gas generated, when the content of the electrolyte is less than a predetermined value, an electrolyte is added to the anode of the electrolysis device, and the applied amount of electricity is changed to control the molar ratio of carbon dioxide gas to hydrogen gas generated by the electrolysis device per unit time, greatly reducing the overall energy consumption of the system while ensuring the carbon dioxide capture efficiency, and contributing to the control of the carbon dioxide gas capture efficiency and the overall energy consumption by the carbon dioxide capture system.

[0074] Optionally, the alkali metal sulfate is potassium sulfate or sodium sulfate.

[0075] Optionally, the alkali metal nitrate is potassium nitrate or sodium nitrate.

[0076] Optionally, the alkali metal phosphate is potassium phosphate or sodium phosphate.

[0077] Optionally, the alkaline solution is an alkali metal hydroxide.

[0078] Optionally, the method of temporarily storing the solution that has chemically reacted with carbon dioxide gas in the first temporary storage structure is a step of installing at least two first temporary storage structures and switching and operating them, each first temporary storage structure being capable of selectively temporarily storing the solution that has chemically reacted with carbon dioxide gas, and when the carbonate concentration in one first temporary storage structure reaches a predetermined concentration value, stopping this first temporary storage structure and starting to use another first temporary storage structure.

[0079] In this embodiment, there are two first temporary storage structures. When the carbonate concentration in the first first temporary storage structure reaches a predetermined concentration value, start using the second first temporary storage structure, perform CO2 capture with the alkaline solution in the second first temporary storage structure, discharge the carbonate solution in the first first temporary storage structure, and then replenish with fresh alkaline solution again. After the carbonate concentration in the second first temporary storage structure reaches a predetermined concentration value, start using the first first temporary storage structure again, and repeat this alternately in this way.

[0080] Optionally, the alkali metal hydroxide is potassium hydroxide or sodium hydroxide.

[0081] As shown in FIGS. 3 to 5, the gas absorption system is used to absorb carbon dioxide gas in the environment. The gas absorption system includes a housing 10, a gas pretreatment device 20, and a gas absorption assembly 30. The housing 10 has an air inlet 11 and an exhaust outlet 12. The air inlet 11 communicates with the exhaust outlet 12, and the exhaust outlet 12 is located above the air inlet 11. The gas pretreatment device 20 is installed in the housing 10 and located at the air inlet 11, and is used to filter impurities in the gas entering the air inlet 11. The gas absorption assembly 30 is installed in the housing 10 and located downstream of the gas pretreatment device 20. The gas absorption assembly 30 includes a first liquid supply device and a first spray structure 31. The first liquid supply device communicates with the first spray structure 31 and is used to provide an alkaline solution. The alkaline solution flowing out of the first spray structure 31 chemically reacts with the carbon dioxide gas in the gas to absorb the carbon dioxide gas.

[0082] According to the technical solution of this embodiment, the gas pretreatment device 20 is installed in the housing 10 and located at the air inlet 11, and the gas absorption assembly 30 is located downstream of the gas pretreatment device 20. In this way, during the operation of the gas absorption system, air or flue gas enters the gas absorption system through the air inlet 11, and then first passes through the gas pretreatment device 20. The impurities in the air or flue gas are filtered by the gas pretreatment device 20, so that the above-mentioned impurities do not accumulate in the gas absorption system and then enter the gas absorption assembly 30 to affect the absorption and collection efficiency of carbon dioxide gas, avoiding the problem in the prior art that impurities such as solid particles mixed in the air or flue gas are likely to accumulate in the CO2 capture system, and further reducing the operation and maintenance costs of the gas absorption system. In addition, by absorbing the impurities in the air or flue gas, the purity of the solution formed after the chemical reaction between the alkaline solution and the carbon dioxide gas can be improved, and the cost of the post-treatment process can be reduced.

[0083] Optionally, the alkaline solution is sodium hydroxide, potassium hydroxide, potassium carbonate, or sodium carbonate, and solutions with different concentrations may be prepared using deionized water as needed.

[0084] In this embodiment, an alkaline solution is used as an absorbent, and not only high-concentration CO2 but also low-concentration CO2 can be captured, so that CO2 capture in a wide concentration range can be realized.

[0085] In this embodiment, the gas absorption system is a countercurrent absorption system, that is, the intake direction and the exhaust direction of air or flue gas are installed perpendicular to each other.

[0086] In this embodiment, there are a plurality of first spray structures 31, and the plurality of first spray structures 31 are installed at intervals along the gas flow direction in the gas absorption system, thereby increasing the spray amount of the alkaline solution of the first spray structure 31, and ensuring that the alkaline solution sprayed from the first spray structure 31 can sufficiently capture and absorb CO2 in air or flue gas.

[0087] Specifically, a staircase 80 is installed on the side wall of the housing 10, and an operator can climb to the top of the housing 10 through the staircase 80 to inspect the gas absorption system.

[0088] Optionally, the first spray structure 31 is a spray head.

[0089] As shown in FIGS. 3 to 5, the gas absorption assembly 30 further includes a first filler 32 and a first water collector 33. The first filler 32 and the exhaust port 12 are installed opposite to each other, and the first filler 32 is located below the first spray structure 31. The first water collector 33 is located above the first spray structure 31. In this way, the first filler 32 provides a sufficient contact surface between CO2 and the alkaline solution, so that CO2 in air or flue gas and the alkaline solution react sufficiently, and the efficiency of the gas absorption assembly 30 for capturing and absorbing CO2 is further improved. The first water collector 33 is used to recover the water vapor in the housing 10 and reduce the fine water droplet floating matter sandwiched in the gas discharged from the exhaust port 12, and can effectively prevent the loss of liquid water due to the water splashing phenomenon at the exhaust port 12.

[0090] Specifically, the alkaline solution drops from the first spray structure 31 into the first filler 32 in the form of droplets, flows in the form of a liquid film within the first filler 32, and after passing through the first filler 32, drops again in the form of droplets into the first temporary storage structure 34. After the impurities contained in the air or flue gas are removed by the gas pretreatment device 20, the air or flue gas enters the gas absorption assembly 30, and the pretreated gas comes into sufficient contact with the alkaline solution in the water-wetted area of the gas absorption assembly 30 and within the first filler 32. Thereby, a chemical reaction is caused between the CO2 in the air or flue gas and the alkaline solution to capture the CO2, and the captured CO2 exists in the first temporary storage structure 34 in the form of carbonate and bicarbonate radicals. The solution after the reaction is transported to a subsequent process system by the first pump 36 for treatment. Further, the first temporary storage structure 34 is provided with a first liquid supply device for replenishing the water and hydroxyl radicals consumed in the solution.

[0091] Optionally, the first filler 32 is a thin-film type splash filler.

[0092] Optionally, the first water collector 33 is a PVC water collector, and the support form of the first water collector 33 is a bracket type.

[0093] As shown in FIGS. 3 to 5, the gas absorption assembly 30 further includes a first temporary storage structure 34, a first pipeline 35, and a first pump 36. The first temporary storage structure 34 is located below the first filler 32 and is used to temporarily store the solution that has chemically reacted with carbon dioxide gas. Both ends of the first pipeline 35 communicate with the first temporary storage structure 34 and the first spray structure 31 respectively. The first pump 36 is installed in the first pipeline 35 to pump the solution that has entered the first temporary storage structure 34 into the first spray structure 31. In this way, by storing the solution that has chemically reacted with carbon dioxide gas through the first temporary storage structure 34, the post-treatment of the above solution can be facilitated, the recycling of the solution can be realized, and the waste of resources can be avoided. In addition, the solution is pumped into the first spray structure 31 by the first pump 36 to ensure that the first spray structure 31 can spray the alkaline solution to react with CO2, improve the spray reliability of the first spray structure 31, and improve the operation reliability of the gas absorption system.

[0094] In this embodiment, the first temporary storage structure 34 and the first liquid supply device have the same structure. At the initial stage when the gas absorption system operates, an alkaline solution is placed in the first temporary storage structure 34, and the alkaline solution is sprayed by the first spray structure 31 onto the first filler 32 to react with CO2 in air or flue gas. The reacted solution is temporarily stored in the first temporary storage structure 34, put into the first spray structure 31 again and continuously sprayed to realize the recycling of the alkaline solution. When the carbonate radical in the alkaline solution reaches a predetermined concentration value, the collection and absorption of CO2 are stopped, and the solution in the first temporary storage structure 34 is replaced with an alkaline solution.

[0095] Note that the relationship between the first temporary storage structure 34 and the first liquid supply device is not limited to this and can be adjusted according to the operating conditions and usage needs. Optionally, by communicating the first temporary storage structure 34 and the first liquid supply device, the first liquid supply device provides an alkaline solution into the first spray structure 31, the solution that has reacted with CO2 is temporarily stored in the first temporary storage structure 34, put into the first spray structure 31 again and continuously sprayed.

[0096] Optionally, there is one first temporary storage structure 34, or there are a plurality of first temporary storage structures 34 and the plurality of first temporary storage structures 34 can be selectively used. In this way, during the operation of the gas absorption system, according to the carbonate concentration in the first temporary storage structure 34, the usage state (in use or not in use) of the first temporary storage structure 34 is adjusted to replenish the first spray structure 31 with fresh alkaline solution, so as to achieve rapid and efficient capture of CO2 by the gas absorption system.

[0097] Optionally, there are a plurality of first temporary storage structures 34, and the gas absorption assembly 30 further includes a first pipeline 35, a plurality of first branch pipelines, and a plurality of first control valves. The first end of the first pipeline 35 communicates with the first spray structure 31. The plurality of first branch pipelines are installed in one-to-one correspondence with the plurality of first temporary storage structures 34, and both ends of each first branch pipeline communicate with the corresponding first temporary storage structure 34 and the second end of the first pipeline 35 respectively. The plurality of first control valves are installed in one-to-one correspondence with the plurality of first branch pipelines, and each first control valve controls the opening and closing state of the corresponding first branch pipeline. At any point in time, at least one first control valve is in an open state. In this way, by controlling the opening and closing state of the first branch pipeline corresponding to it by the first control valve, the usage state of the first temporary storage structure 34 communicating with the first branch pipeline is controlled, making it easier and simpler for the operator to control the usage state of the first temporary storage structure 34 and reducing the control difficulty. Also, through the above installation, a plurality of first temporary storage structures 34 are installed in parallel, and at any point in time, at least one first temporary storage structure 34 is controlled to be used to provide alkaline solution to the first spray structure 31.

[0098] As shown in FIGS. 3 to 5, the gas pretreatment device 20 includes a second filler 21, a second liquid supply device, and a second spray structure 22. The second filler 21 is installed opposite to the air inlet 11. The second spray structure 22 is located above the second filler 21, and the second liquid supply device communicates with the second spray structure 22. Specifically, the second spray structure 22 is used to spray water. In the process of the gas pretreatment device 20 filtering impurities in air or flue gas, the second filler 21 provides a sufficient contact surface between the impurities and water in the air or flue gas, so that the water knocks down the impurities and avoids the impurities from entering the gas absorption assembly 30.

[0099] Specifically, after passing through the gas pretreatment device 20, the humidity of the gas increases, the evaporation amount of water in the gas absorption system is reduced, the loss of deionized water is decreased, and the cost of CO2 capture can be reduced.

[0100] In this embodiment, the second liquid supply device is used to supply tap water.

[0101] Optionally, the second spray structure 22 is a spray head.

[0102] Optionally, the second filler 21 is a thin-film splash filler.

[0103] Optionally, the second water collector 23 is a PVC water collector.

[0104] As shown in FIGS. 3 to 5, the gas absorption assembly 30 further includes a first main pipeline 51 and a plurality of second branch pipelines 52. Here, the first main pipeline 51 is connected to the first pipeline 35, and there are a plurality of second branch pipelines 52. Each second branch pipeline 52 is connected to the first main pipeline 51. There are a plurality of first spray structures 31, and a plurality of first spray structures 31 are installed on each second branch pipeline 52.

[0105] As shown in FIGS. 3 to 5, the gas pretreatment device 20 further includes a second water collector 23. The second water collector 23 is installed opposite to the second filler 21. In this way, the second water collector 23 is used to collect the water vapor in the housing 10, reduce the fine water droplet floating matter sandwiched in the gas discharged from the exhaust port 12, and effectively prevent the loss of liquid water due to the water splashing phenomenon at the exhaust port 12.

[0106] Optionally, there is one second water collector 23, or there are a plurality of second water collectors 23, and at least one second water collector 23 is located on the first side of the second filler 21 and at least one other second water collector 23 is located on the second side of the second filler 21. In this way, the above installation makes the selection of the number of the second water collectors 23 more flexible, meets different usage needs and operating conditions, and also improves the processing flexibility of the operator. In addition, the plurality of second water collectors 23 can improve the water vapor recovery efficiency and further prevent the loss of liquid water due to the water splashing phenomenon at the exhaust port 12.

[0107] In this embodiment, there are two second water collectors 23. One second water collector 23 is located on the first side of the second filler 21, and the other second water collector 23 is located on the second side of the second filler 21, thereby sufficiently collecting the water vapor in the housing 10.

[0108] It should be noted that the number of the second water collectors 23 is not limited to this and can be adjusted according to the operating conditions and usage needs. Optionally, there are three, four, five, or a plurality of second water collectors 23.

[0109] As shown in FIGS. 3 to 5, the gas pretreatment device 20 further includes a second temporary storage structure 24, a second pipeline 25, and a second pump 26. The second temporary storage structure 24 is located below the second filler 21 and temporarily stores the liquid flowing out of the second filler 21. Both ends of the second pipeline 25 communicate with the second spray structure 22 and the second temporary storage structure 24 respectively. The second pump 26 is installed in the second pipeline 25 and is used to pump the liquid that has entered the second temporary storage structure 24 into the second spray structure 22. In this way, the water flowing from the second filler 21 is stored by the second temporary storage structure 24, realizing the recycling of water and avoiding the waste of resources. In addition, by pumping water into the second spray structure 22 by the second pump 26, it is ensured that the second spray structure 22 can spray water to sink impurities, improving the spray reliability of the second spray structure 22 and the operating reliability of the gas pretreatment device 20.

[0110] Optionally, the second temporary storage structure 24 includes a first temporary storage body and a first partition plate. The first partition plate is installed in the first temporary storage body and divides the inner chamber of the first temporary storage body into a third sub-storage chamber and a fourth sub-storage chamber. The third sub-storage chamber is located below the second filler 21, and the fourth sub-storage chamber communicates with the second pipeline 25. The first partition plate has an overflow hole or forms an overflow part between it and the first temporary storage body, and the third sub-storage chamber communicates with the fourth sub-storage chamber through the overflow hole or the overflow part. In this way, due to the above installation of the first partition plate, it is ensured that the impurities that enter the third sub-storage chamber after being sprayed by the second spray structure 22 can precipitate sufficiently in the third sub-storage chamber, avoiding the impurities entering the second pipeline 25 and clogging the second spray structure 22, and improving the spray efficiency of the second spray structure 22. In addition, due to the above installation, the overflow mode of the liquid in the second temporary storage structure 24 is made more diverse, meeting different usage needs and operating conditions, and also improving the processing flexibility of the operator.

[0111] Optionally, the second filling material 21 includes a plurality of first sub-filling material plates. Two adjacent first sub-filling material plates are alternately installed to form a flow path. Turbulent flow protrusions or turbulent flow recesses located within the flow path are installed on the surfaces of the respective first sub-filling material plates. In this way, when the gas and liquid mixed with impurities gather within the flow path, due to the above installation of the turbulent flow protrusions or turbulent flow recesses, turbulence is generated here in the gas, further increasing the contact area between the gas and the liquid. Thereby, it is ensured that the impurities mixed in the gas come into contact with the liquid as much as possible and are flowed into the second temporary storage structure 24 by the liquid.

[0112] In other embodiments not shown, the gas absorption system further includes a filter net or a filter film located between the gas pretreatment device 20 and the air inlet 11. In this way, the above installation performs preliminary filtration by the filter net or the filter film, and performs secondary filtration by the gas pretreatment device 20, improving the overall filtration efficiency of the gas absorption system.

[0113] Optionally, the bottom surface of the first temporary storage structure 34 has a flow guiding inclined surface. In this way, due to the above installation, the solution gathers at a relatively low position on the bottom surface within the first temporary storage structure 34, and the solution easily enters the first pipeline 35, avoiding the solution accumulating in dead corners within the first temporary storage structure 34 and increasing the cleaning difficulty for the operator.

[0114] In this embodiment, the bottom surface of the first temporary storage structure 34 is an inclined surface. In this way, due to the above installation, the bottom surface of the first temporary storage structure 34 is easier to process, reducing the processing cost of the gas absorption system.

[0115] In other embodiments not shown in the drawings, the bottom surface of the first temporary storage structure 34 is a conical surface.

[0116] In this embodiment, the second temporary storage structure 24 and the second liquid supply device have the same structure, reducing the number of structures of the gas absorption system and making it easier for the operator to perform attachment, detachment, and maintenance on the gas absorption system.

[0117] Note that the relationship between the second temporary storage structure 24 and the second liquid supply device is not limited to this and can be adjusted according to the operating conditions and usage needs. Optionally, the second temporary storage structure 24 communicates with the second liquid supply device to provide water into the second spray structure 22 by the second liquid supply device, temporarily store the water and impurities flowing from the second filler 21 in the second temporary storage structure 24, and then put it back into the second spray structure 22 to continue spraying.

[0118] As shown in FIG. 3, the housing 10 has a storage chamber 13, the air inlet 11 communicates with the exhaust port 12 through the storage chamber 13, and the gas absorption assembly 30 is located in the storage chamber 13. There is one air inlet 11 and one gas pretreatment device 20, or there are multiple air inlets 11 and the multiple air inlets 11 are installed around the storage chamber 13, and there are multiple gas pretreatment devices 20 and the multiple gas pretreatment devices 20 are installed in one-to-one correspondence with the multiple air inlets 11. In this way, through the above installation, the selection of the number of air inlets 11 is made more flexible, different usage needs and operating conditions are satisfied, and the processing flexibility of the operator is also improved.

[0119] In this embodiment, there are two air inlets 11, the two air inlets 11 are respectively located on both sides of the storage chamber 13, there are two gas pretreatment devices 20, the two gas pretreatment devices 20 are installed in one-to-one correspondence with the two air inlets 11, and each gas pretreatment device 20 filters the impurities in the air or flue gas entering from the corresponding air inlet 11 to ensure that all the air or flue gas entering the gas absorption system has passed through the impurity filtration step, and to avoid the deposition of impurities in the gas absorption system and the influence on the CO2 capture efficiency of the gas absorption system.

[0120] Note that the number of air inlets 11 is not limited to this and can be adjusted according to the operating conditions and usage needs. Preferably, the number of air inlets 11 is three, four, five, or more.

[0121] Note that the number of gas pretreatment devices 20 is not limited to this and may just match the number of air inlets 11.

[0122] As shown in FIGS. 3 and 5, the gas absorption system further includes a gas transport device 40 and a first detection device. The gas transport device 40 is installed at the exhaust port 12 and / or the intake port 11 and is used to transport gas from the intake port 11 outside the gas absorption system. The first detection device is installed in the first temporary storage structure 34 and is used to detect the concentration of carbonate ions in the solution. When the detection value of the first detection device reaches a first predetermined concentration value, the gas transport device 40 is controlled to stop operating. In this way, during the operation of the gas absorption system, when the detection value of the first detection device reaches a predetermined concentration value, it is determined that the collection and absorption of CO2 in the air or flue gas by the gas absorption system is completed, or the collection of CO2 by the alkaline solution is saturated. In this case, the gas absorption system is controlled to stop exhausting or replenish the alkaline solution.

[0123] Optionally, the gas transport device 40 includes a fan installed at the exhaust port 12 and / or the gas transport device 40 includes a compressor installed at the intake port. In this way, the above installation of the fan can suck the gas that has completed absorption in the gas absorption system outside the gas absorption system and ensure the smooth flow of gas in the gas absorption system. In addition, the compressor compresses the gas located at the intake port into high-pressure gas and puts it into the gas absorption system, increases the flow rate of the gas, and improves the CO2 capture efficiency of the gas absorption system.

[0124] In this embodiment, the gas transport device 40 includes a fan, and the fan is installed at the exhaust port 12.

[0125] Optionally, when the detection value of the first detection device reaches a predetermined concentration value, it is determined that the collection and absorption capacity of the alkaline solution in the first temporary storage structure 34 in use for CO2 cannot meet the usage requirements of the gas absorption system. At this time, the first temporary storage structure 34 in use is replaced to improve the stability of the CO2 collection and absorption capacity of the gas absorption system.

[0126] Optionally, the gas absorption system further includes a second detection device. The second detection device is installed in the first temporary storage structure 34 and is used to detect the concentration of hydroxide in the solution. When the detection value of the second detection device is less than the second predetermined concentration value, the first pump 36 is controlled to start. In this way, when the detection value of the second detection device is less than the second predetermined concentration value, it is determined that the alkaline solution in the first temporary storage structure 34 is saturated and the collection efficiency for CO2 cannot meet the usage requirements. At this time, it is necessary to replenish the alkaline solution into the first temporary storage structure 34 by the alkaline solution pump, and stop the liquid supply when the detection value of the second detection device reaches the required value.

[0127] Optionally, the gas absorption assembly 30 further includes a first liquid level gauge. The first liquid level gauge is installed in the first temporary storage structure 34 and is used to detect the height of the solution in the first temporary storage structure 34. When the liquid level is lower than the first liquid level value, water is replenished into the first temporary storage structure 34 by a water replenishing pump, and the water replenishment is stopped when the liquid level reaches the predetermined liquid level.

[0128] Optionally, the gas pretreatment device 20 further includes a second liquid level gauge. The second liquid level gauge is installed in the second temporary storage structure 24 and is used to detect the water level of the second temporary storage structure 24. When the liquid level is lower than the second liquid level value, water is replenished into the second temporary storage structure 24 by a water replenishing pump, and the water replenishment is stopped when the liquid level reaches the predetermined liquid level.

[0129] As shown in FIGS. 3 and 5, the gas absorption system further includes a blower 60 and a gear box 70. The blower 60 is connected to the housing and is located at the exhaust port 12 to deflect the gas discharged from the exhaust port 12. The gear box 70 is drivingly connected to the fan to operate the fan.

[0130] Optionally, there is one first filler 32, or there are a plurality of first fillers 32, and the plurality of first fillers 32 are installed at intervals along the longitudinal direction of the gas absorption system.

[0131] Optionally, there is one second filler 21, or there are a plurality of second fillers 21, and the plurality of second fillers 21 are installed at intervals along the longitudinal direction of the gas absorption system.

[0132] Optionally, the first spray structure 31 has a spray density of 0 to 20 m 3 <m 2 ×h, and deionized water is used.

[0133] Optionally, the gas absorption system further includes a waterwheel and a generator. The waterwheel is located under the first temporary storage structure 34, and the liquid located in the first temporary storage structure 34 flows to the waterwheel through a diversion slope. The generator is connected to the waterwheel. Thus, during the operation of the gas absorption system, the waterwheel is rotationally driven by the liquid position energy to realize the power generation function of the generator, and the generator can supply power to the first pump 36 and the second pump 26 to recover and utilize the liquid position energy, and reduce the overall energy consumption of the gas absorption system.

[0134] Optionally, the gas absorption system further includes a stirring device. The stirring device is installed in the first temporary storage structure 34. Thus, due to the above installation of the stirring device, the mixing of fresh water and fresh alkaline liquid becomes more uniform.

[0135] In this embodiment, the carbon dioxide capture method is applied to the gas absorption system, and the gas absorption system is used to absorb carbon dioxide gas. Here, the gas absorption system includes a housing and a gas absorption assembly, has an air inlet and an exhaust port, and the air inlet and the exhaust port are installed opposite to each other. The gas absorption assembly is installed in the housing and is located downstream of the gas pretreatment device. The gas absorption assembly includes a liquid supply device and a spray structure that communicate with each other and is used to provide an alkaline solution. The alkaline solution flowing out of the spray structure chemically reacts with the carbon dioxide gas in the gas to absorb the carbon dioxide gas.

[0136] Optionally, the gas absorption system is a cross-flow absorption system or a counter-current absorption system. Here, in the cross-flow absorption system, the intake direction and the exhaust direction of air or flue gas are the same. The counter-current absorption system is installed at an included angle between the intake direction and the exhaust direction of air or flue gas.

[0137] Optionally, the spray structure is a spray head.

[0138] Optionally, the gas absorption assembly includes a packing material and a water collector. The packing material is located below the spray structure. The water collector is installed opposite to the packing material. In this way, the packing material provides a sufficient contact surface for CO2 and the alkaline solution, enabling sufficient reaction between CO2 in the air or flue gas and the alkaline solution, and further improving the collection and absorption efficiency of CO2 by the gas absorption assembly. The water collector is used to recover the absorption liquid in the gas absorption assembly and reduce the fine water droplet floating matter sandwiched in the gas discharged from the gas absorption assembly. Also, due to the above installation, the installation position of the water collector becomes more flexible, meeting different usage needs and operating conditions, and also improving the processing flexibility of the operator.

[0139] Specifically, the alkaline solution drops from the spray structure into the packing material in the form of droplets, flows in the form of a liquid film within the packing material, and after passing through the packing material, drops again in the form of droplets into the first temporary storage structure. The pretreated gas comes into sufficient contact with the alkaline solution in the wetted area of the gas absorption assembly and within the packing material, causing a chemical reaction between CO2 in the air or flue gas and the alkaline solution to capture CO2. The captured CO2 exists in the form of carbonate and bicarbonate within the first temporary storage structure, and the solution after the reaction is transported to the subsequent process system for treatment by the first pump or the third pump. Also, the first temporary storage structure is equipped with a first liquid supply device to replenish the consumed water and hydroxyl groups in the solution.

[0140] Optionally, the packing material is a thin-film splash packing material.

[0141] Optionally, the water collector is a PVC water collector, and the supporting form of the water collector is a bracket type.

[0142] In this embodiment, the gas absorption assembly further includes a first temporary storage structure. The first temporary storage structure is located under the filler and is used to temporarily store the solution after the chemical reaction with carbon dioxide gas. In this way, by storing the solution after the chemical reaction with carbon dioxide gas in the first temporary storage structure, it contributes to the post-treatment of the above solution, while realizing the recycling of the solution and avoiding waste of resources.

[0143] In this embodiment, the first temporary storage structure and the liquid supply device have the same structure. At the initial stage when the gas absorption system operates, an alkaline solution is placed in the first temporary storage structure, and the alkaline solution is sprayed onto the filler by the spray structure to react with CO2 in the air or flue gas. The solution after the reaction is temporarily stored in the first temporary storage structure and then put into the spray structure again for continuous spraying. In this way, the recycling of the alkaline solution is realized. When the carbonate radical in the alkaline solution reaches a predetermined concentration value, the collection and absorption of CO2 are stopped, and the solution in the first temporary storage structure is replaced with an alkaline solution.

[0144] Note that the relationship between the first temporary storage structure and the liquid supply device is not limited to this and can be adjusted according to the operating conditions and usage needs. Optionally, the first temporary storage structure and the liquid supply device are in communication. The liquid supply device provides an alkaline solution into the spray structure, and the solution reacted with CO2 is temporarily stored in the first temporary storage structure and then put into the spray structure again for continuous spraying.

[0145] Optionally, there is one first temporary storage structure, or there are a plurality of first temporary storage structures, and the plurality of first temporary storage structures can be selectively used. In this way, during the operation of the gas absorption system, the usage state (in use or not in use) of the first temporary storage structure is adjusted based on the carbonate radical concentration in the first temporary storage structure, and fresh alkaline solution is replenished into the spray structure to realize the rapid and efficient collection of CO2 by the gas absorption system.

[0146] Optionally, there are a plurality of first temporary storage structures, and the gas absorption assembly further includes a main pipeline, a plurality of branch pipelines, and a plurality of control valves. The first end of the main pipeline communicates with the spray structure. The plurality of branch pipelines are installed in one-to-one correspondence with the plurality of first temporary storage structures, and both ends of each branch pipeline communicate with the corresponding first temporary storage structure and the second end of the main pipeline respectively. The plurality of control valves are installed in one-to-one correspondence with the plurality of branch pipelines, and each control valve controls the opening and closing state of the corresponding branch pipeline. At any time, at least one control valve is in an open state. In this way, by controlling the opening and closing state of the corresponding branch pipeline, the control valve controls the usage state of the first temporary storage structure communicated with the branch pipeline, making it easier and more simplified for the operator to control the usage state of the first temporary storage structure and reducing the difficulty of control. Also, by the above installation, the plurality of first temporary storage structures are installed in parallel, and at any time, at least one first temporary storage structure is controlled to be in use to provide an alkaline solution to the spray structure.

[0147] In this embodiment, the gas absorption assembly further includes a first pump or a third pump. The first pump or the third pump is installed in the main pipeline or the branch pipeline and is used to pump the solution that has entered the first temporary storage structure into the spray structure. In this way, by pumping the solution into the spray structure by the first pump or the third pump, it is ensured that the spray structure sprays the alkaline solution to react with CO2, further improving the spray reliability of the spray structure and the operation reliability of the gas absorption system.

[0148] In this embodiment, the gas absorption system further includes an electrolysis device. The electrolysis device is located downstream of the first temporary storage structure. The electrolysis device electrolyzes the carbonic acid solution discharged from the first temporary storage structure to generate potassium hydroxide and hydrogen gas at the cathode of the electrolysis device, and generates a mixed gas of oxygen gas and carbon dioxide gas at the anode of the electrolysis device. Potassium hydroxide is used for carbon dioxide absorption by the gas absorption system.

[0149] [Embodiment 2] The carbon dioxide capture method in Example 2 differs from that in Example 1 in that the values of m and n and the amount of electricity applied by the electrolysis device are different.

[0150] In this example, m is 0.3 mol / L, n is 5.5 mol / L, and the amount of electricity applied by the electrolysis device is controlled so that the amount of electricity obtained for a solution containing 1 mol of carbonate is 55.1 A·h. It was measured that the electrical energy consumption of the electrolysis device is 3.36 kWh / kgCO2 and the molar ratio of the generated carbon dioxide gas to hydrogen gas is 1:1.03.

[0151] [Example 3] The carbon dioxide capture method in Example 3 differs from that in Example 1 in that the values of m and n and the amount of electricity applied by the electrolysis device are different.

[0152] In this example, m is 5 mol / L, n is 1 mol / L, and it was measured that the electrical energy consumption of the electrolysis device is 11.46 kWh / kgCO2. The amount of electricity applied by the electrolysis device is controlled so that the amount of electricity obtained for a solution containing 1 mol of carbonate is 187.6 A·h, and the molar ratio of the generated carbon dioxide gas to hydrogen gas is 1:3.5.

[0153] [Example 4] The carbon dioxide capture method in Example 4 differs in that the values of m and n and the amount of electricity applied by the electrolysis device are different.

[0154] In this example, m is 0.1 mol / L, n is 5.3 mol / L, and the amount of electricity applied by the electrolysis device is controlled so that the amount of electricity obtained for a solution containing 1 mol of carbonate is 54.1 A·h. It was measured that the electrical energy consumption of the electrolysis device is 3.29 kWh / kgCO2 and the molar ratio of the generated carbon dioxide gas to hydrogen gas is 1:1.

[0155] [Example 5] The carbon dioxide capture method in Example 5 is different from that in Example 1 in that the values of m and n and the amount of electricity applied by the electrolysis device are different.

[0156] In this example, m is 2.5 mol / L, n is 0.5 mol / L, the amount of electricity applied by the electrolysis device is controlled so that the amount of electricity required to obtain a solution containing 1 mol of carbonate is 187.6 A·h, the electricity energy consumption of the electrolysis device is 11.83 kWh / kgCO2, and the production molar ratio of carbon dioxide gas to hydrogen gas is measured to be 1:3.5.

[0157] [Example 6] The carbon dioxide capture method in Example 6 is different from that in Example 1 in that the amount of electricity applied by the electrolysis device is different.

[0158] In this example, the amount of electricity applied by the electrolysis device is controlled so that the amount of electricity required to obtain a solution containing 1 mol of carbonate is 107.2 A·h, the electricity energy consumption of the electrolysis device is 6.63 kWh / kgCO2, and the production molar ratio of carbon dioxide gas to hydrogen gas is measured to be 1:2.01.

[0159] Table 1 shows the comparison results of the electricity energy consumption of the electrolysis device and the production molar ratio of carbon dioxide gas to hydrogen gas measured in all the above examples.

[0160] Table 1 is a comparison table of the electricity energy consumption of the electrolysis device and the production molar ratio of carbon dioxide gas to hydrogen gas in each example.

[0161]

Table 1

[0162] From the above comparison, the following conclusions can be obtained.

[0163] 1. Comparing Example 3 and Example 5, according to the carbon dioxide capture method in this example, the hydroxide concentration and / or carbonate concentration in the solution within the temporary storage structure can be precisely controlled. When the solution within the temporary storage structure is fed into an electrolysis device for electrolysis, the concentration ranges of hydroxide and carbonate in the solution include, but are not limited to, the preferred ranges of this application. Limiting these within the preferred ranges of this application is advantageous for reducing the energy consumption of the electrolysis device, further reducing the process cost of the carbon dioxide capture system, and effectively solving the problem that it is relatively difficult to capture carbon dioxide gas and the overall energy consumption in the carbon dioxide capture system in the prior art.

[0164] 2. Comparing Examples 1 to 6, according to the carbon dioxide capture method in this example, the molar ratio of carbon dioxide gas to hydrogen gas generated during the electrolysis process can be adjusted, and the molar ratio of carbon dioxide gas to hydrogen gas in the system can be flexibly adjusted according to the actual needs of the downstream carbon dioxide gas utilization device, significantly improving the application range of the system.

[0165] [Example 7] The gas absorption system in Example 7 is different from that in Example 1 in that the air intake and exhaust directions of the gas absorption system are different.

[0166] As shown in FIGS. 6 and 7, the gas absorption system is used to absorb carbon dioxide gas in the environment. The gas absorption system includes a housing 10, a gas pretreatment device 20, a gas absorption assembly 30, and a gas transport device 40. The housing 10 has an air inlet 11 and an exhaust outlet 12 that communicate with each other, and the air inlet 11 and the exhaust outlet 12 are arranged opposite to each other. The gas pretreatment device 20 is installed in the housing 10, located at the air inlet 11, and is used to filter impurities in the gas entering the air inlet 11. The gas absorption assembly 30 is installed in the housing 10, located downstream of the gas pretreatment device 20. The gas absorption assembly 30 includes a first liquid supply device and a first spray structure 31. The first liquid supply device is used to supply an alkaline solution in communication with the first spray structure 31. The alkaline solution flowing out from the first spray structure 31 chemically reacts with the carbon dioxide gas in the gas to absorb the carbon dioxide gas. The gas transport device 40 is installed at the exhaust outlet 12 and / or the air inlet 11 and is used to send the gas from the air inlet 11 outside the gas absorption system.

[0167] Specifically, the gas pretreatment device 20 is installed in the housing 10 and located at the air inlet 11, and the gas absorption assembly 30 is located downstream of the gas pretreatment device 20. In this way, during the operation of the gas absorption system, after air or flue gas enters the gas absorption system from the air inlet 11, it first passes through the gas pretreatment device 20. The gas pretreatment device 20 filters impurities in the air or flue gas to prevent the impurities from accumulating in the gas absorption system, and thus from entering the gas absorption assembly 30 and affecting the absorption and collection efficiency of carbon dioxide gas. This solves the problem in the prior art that impurities such as solid particles mixed in air or flue gas are likely to accumulate in the CO2 capture system, and reduces the operation and maintenance costs of the gas absorption system. In addition, by absorbing impurities in the air or flue gas, the purity of the solution formed after the chemical reaction between the alkaline solution and the carbon dioxide gas can be improved, and the cost of the post-treatment process can be reduced.

[0168] Optionally, the gas transport device 40 includes a fan installed at the exhaust port 12, and / or the gas transport device 40 includes a compressor installed at the intake port 11 . Thus, by the above installation of the fan, the gas that has completed absorption and is located within the gas absorption system can be suctioned outside the gas absorption system, and it can be ensured that the gas flows smoothly within the gas absorption system. Further, the compressor compresses the gas located at the intake port 11 into high-pressure gas and introduces it into the gas absorption system, increasing the flow rate of the gas and improving the CO2 capture efficiency of the gas absorption system.

[0169] In this embodiment, the gas transport device 40 includes a fan, and the fan is installed at the exhaust port 12.

[0170] Optionally, the alkaline solution is sodium hydroxide, potassium hydroxide, potassium carbonate, or sodium carbonate, and solutions with different concentrations can be prepared using deionized water as needed.

[0171] In this embodiment, by using an alkaline solution as the absorbent, not only high-concentration CO2 but also low-concentration CO2 can be captured, realizing the capture of CO2 in a wide concentration range.

[0172] In this embodiment, the gas absorption system is a direct and alternating current type absorption system, that is, the intake direction and the exhaust direction of the air or flue gas are the same.

[0173] In this embodiment, there are a plurality of first spray structures 31, and the plurality of first spray structures 31 are installed at intervals along the gas flow direction within the gas absorption system, increasing the spray amount of the alkaline solution of the first spray structure 31 and ensuring that the alkaline solution sprayed from the first spray structure 31 can sufficiently capture and absorb CO2 in the air or flue gas.

[0174] Optionally, the first spray structure 31 is a spray head.

[0175] Optionally, the gas absorption assembly 30 includes a third filler 132 and a third water collector 133. The third filler 132 is located below the first spray structure 31. The third water collector 133 and the third filler 132 are arranged oppositely. The third water collector 133 is located between the exhaust port 12 and the third filler 132, and / or the third water collector 133 is located between the third filler 132 and the gas pretreatment device 20. In this way, by providing a sufficient contact surface between CO2 and the alkaline solution by the third filler 132, the CO2 in the air or flue gas reacts sufficiently with the alkaline solution, and the collection and absorption efficiency of CO2 by the gas absorption assembly 30 is further improved. The third water collector 133 is a housing 10 used to recover the water vapor in the housing and reduce the fine water droplet suspensions sandwiched in the gas discharged from the exhaust port 12, and can effectively prevent the loss of liquid water due to the water splashing phenomenon at the exhaust port 12. Also, with the above installation, the installation position of the third water collector 133 becomes more flexible, meeting different usage needs and operating conditions, and also improving the processing flexibility of the operator.

[0176] Specifically, the alkaline solution falls from the first spray structure 31 into the third filler 132 in the form of droplets, flows in the form of a liquid film in the third filler 132, and after passing through the third filler 132, falls into the third temporary storage structure 134 in the form of droplets again. After the impurities contained in the air or flue gas are removed by the gas pretreatment device 20, the air or flue gas enters the gas absorption assembly 30, and the pretreated gas sufficiently contacts the alkaline solution in the water-wetted area of the gas absorption assembly 30 and within the third filler 132. Thereby, the CO2 in the air or flue gas reacts chemically with the alkaline solution to capture the CO2, and the captured CO2 exists in the third temporary storage structure 134 in the form of carbonate and bicarbonate, and the reacted solution is transported to the subsequent process system by the third pump 136 for treatment. Also, the third temporary storage structure 134 is provided with a first liquid supply device for replenishing the water and hydroxide ions consumed in the solution.

[0177] In this embodiment, the third water collector 133 is located between the exhaust port 12 and the third filler 132, and collects fine water droplet suspensions sandwiched in the gas discharged from the exhaust port 12.

[0178] Note that the installation position of the third water collector 133 is not limited to this and can be adjusted according to the operating conditions and usage needs.

[0179] In other embodiments not shown, the third water collector 133 is located between the third packing material 132 and the gas pretreatment device 20.

[0180] In other embodiments not shown, there are a plurality of third water collectors 133. At least one third water collector 133 is located between the exhaust port 12 and the third packing material 132, and at least one third water collector 133 is located between the third packing material 132 and the gas pretreatment device 20, thereby sufficiently recovering the water vapor in the housing 10.

[0181] Optionally, the third packing material 132 is a thin-film type splash packing material.

[0182] Optionally, the third water collector 133 is a PVC water collector, and the support form of the third water collector 133 is a bracket type.

[0183] As shown in FIG. 6, the gas absorption assembly 30 further includes a third temporary storage structure 134. The third temporary storage structure 134 is located below the third packing material 132 and is used to temporarily store the solution that has chemically reacted with carbon dioxide gas. In this way, by storing the solution that has chemically reacted with carbon dioxide gas in the third temporary storage structure 134, it is possible to facilitate the post-treatment of the above solution, realize the recycling of the solution, and avoid resource waste.

[0184] In this embodiment, the third temporary storage structure 134 and the first liquid supply device have the same structure. At the initial stage when the gas absorption system operates, an alkaline solution is placed in the third temporary storage structure 134, and the alkaline solution is sprayed by the first spray structure 31 onto the third filler 132 to react with CO2 in air or flue gas. The reacted solution is temporarily stored in the third temporary storage structure 134, put back into the first spray structure 31 again, and continuously sprayed. Thereby, the recycling use of the alkaline solution is realized. When the carbonate radical in the alkaline solution reaches a predetermined concentration value, the collection and absorption of CO2 are stopped, and the solution in the third temporary storage structure 134 is replaced with an alkaline solution.

[0185] Note that the relationship between the third temporary storage structure 134 and the first liquid supply device is not limited to this and can be adjusted according to the operating conditions and usage needs. Optionally, by communicating the third temporary storage structure 134 and the first liquid supply device, the first liquid supply device provides an alkaline solution into the first spray structure 31, the solution reacted with CO2 is temporarily stored in the third temporary storage structure 134, enters the first spray structure 31 again, and is continuously sprayed.

[0186] Optionally, there is one third temporary storage structure 134, or there are multiple third temporary storage structures 134 and multiple third temporary storage structures 134 can be selectively used. In this way, during the operation of the gas absorption system, according to the carbonate radical concentration in the third temporary storage structure 134, the usage state (in use or not in use) of the third temporary storage structure 134 is adjusted to replenish a fresh alkaline solution into the first spray structure 31, and rapid and efficient collection of CO2 by the gas absorption system can be realized.

[0187] Optionally, there are a plurality of third temporary storage structures 134, and the gas absorption assembly 30 further includes a second main pipeline 135, a plurality of third branch pipelines, and a plurality of control valves. The first end of the second main pipeline 135 communicates with the first spray structure 31. The plurality of third branch pipelines are installed in one-to-one correspondence with the plurality of third temporary storage structures 134, and both ends of each third branch pipeline communicate with the corresponding third temporary storage structure 134 and the second end of the second main pipeline 135 respectively. The plurality of control valves are installed in one-to-one correspondence with the plurality of third branches, and each control valve controls the opening and closing state of the corresponding third branch pipeline. At any point in time, at least one control valve is in the open state. In this way, by controlling the opening and closing state of the corresponding third branch pipeline by the control valve, the use state of the third temporary storage structure 134 communicating with the third branch pipeline is controlled, making it easier and simpler for the operator to control the use state of the third temporary storage structure 134 and reducing the difficulty of control. Also, with the above installation, a plurality of third temporary storage structures 134 are installed in parallel, and at any point in time, at least one third temporary storage structure 134 is controlled to be in use to provide an alkaline solution to the first spray structure 31.

[0188] Optionally, the gas absorption assembly 30 further includes a third detection device. The third detection device is installed in the second main pipeline 135 and is used to detect the concentration of carbonate ions in the solution in the second main pipeline 135. When the detection value of the third detection device reaches a predetermined concentration value, at least one control valve controls the third branch pipeline corresponding to the used third temporary storage structure 134 to be in a blocked state, and at least one other control valve controls at least one other third temporary storage structure 134 to be used. In this way, during the operation of the gas absorption system, when the detection value of the third detection device reaches the predetermined concentration value, it is determined that the ability of the alkaline solution in the used third temporary storage structure 134 to capture and absorb CO2 cannot meet the usage requirements of the gas absorption system. At this time, the used third temporary storage structure 134 is replaced to improve the stability of the ability of the gas absorption system to capture and absorb CO2.

[0189] As shown in FIGS. 6 and 7, the gas absorption assembly 30 further includes a third pump 136. The third pump 136 is installed in the second main pipeline 135 or the third branch pipeline and is used to pump the solution that has entered the third temporary storage structure 134 into the first spray structure 31. In this way, the third pump 136 pumps the solution into the first spray structure 31 to ensure that the first spray structure 31 sprays the alkaline solution to react with CO2, improve the spray reliability of the first spray structure 31, and improve the operation reliability of the gas absorption system.

[0190] Optionally, the third pump 136 is the first pump P is.

[0191] As shown in FIGS. 6 and 7, the gas pretreatment device 20 includes a fourth filler 121, a third liquid supply device, a third spray structure 122, and a fourth water collector 123. The fourth filler 121 is installed opposite to the air inlet 11. The third spray structure 122 is located above the fourth filler 121, and the third liquid supply device communicates with the third spray structure 122. The fourth water collector 123 is installed opposite to the fourth filler 121. Specifically, the third spray structure 122 is used to spray water. In the process of the gas pretreatment device 20 filtering impurities in air or flue gas, the fourth filler 121 provides a sufficient contact surface between the impurities in air or flue gas and water, ensuring that water knocks down the impurities and avoiding the entry of impurities into the gas absorption assembly 30. The fourth water collector 123 is used to collect the water vapor in the housing 10 and can reduce the fine water droplet floating matter sandwiched in the gas discharged from the exhaust port 12, effectively preventing the loss of liquid water due to water splashing at the exhaust port 12.

[0192] Specifically, after passing through the gas pretreatment device 20, the humidity of the gas increases, the evaporation amount of water in the gas absorption system is reduced, the loss of deionized water is decreased, and the cost of CO 2 collection can be reduced.

[0193] In this embodiment, the third liquid supply device is used to supply tap water.

[0194] Optionally, the third spray structure 122 is a spray head.

[0195] Optionally, the fourth filler 121 is a thin-film splash filler.

[0196] Optionally, the fourth receiver 123 is a PVC water collector.

[0197] Optionally, there is one fourth water collector 123, or there are multiple fourth water collectors 123, with at least one fourth water collector 123 located on the first side of the fourth filler 121 and at least one fourth water collector 123 located on the second side of the fourth filler 121. In this way, with the above installation, the number of the fourth water collectors 123 can be selected more flexibly to meet different usage needs and operating conditions, and the flexibility of the operator's processing is also improved. In addition, multiple fourth water collectors 123 can improve the water vapor recovery efficiency and further prevent the loss of liquid water due to the water splashing phenomenon at the exhaust port 12.

[0198] In this embodiment, there are two fourth water collectors 123, one fourth water collector 123 is located on the first side of the fourth filler 121, and the other fourth water collector 123 is located on the second side of the fourth filler 121, thereby 10 fully recovering the water vapor inside the housing.

[0199] Note that the number of the fourth water collectors 123 is not limited to this and can be adjusted according to the operating conditions and usage needs. Optionally, the number of the fourth water collectors 123 is three, four, five, or more.

[0200] As shown in FIGS. 6 and 7, the gas pretreatment device 20 further includes a fourth temporary storage structure 124, a third main pipeline 125, and a fourth pump 126. Here, the fourth temporary storage structure 124 is located under the fourth filler 121 and temporarily stores the liquid flowing out from the fourth filler 121. Both ends of the third main pipeline 125 communicate with the third spray structure 122 and the fourth temporary storage structure 124 respectively. The fourth pump 126 is installed in the third main pipeline 125 and is used to pump the liquid entering the fourth temporary storage structure 124 into the third spray structure 122. In this way, the fourth temporary storage structure 124 stores the water flowing from the fourth filler 121, realizes the recycling of water, and avoids waste of resources. In addition, by pumping water into the third spray structure 122 by the fourth pump 126, the third spray structure 122 sprays water to sink impurities, improves the spraying reliability of the third spray structure 122, and improves the operating reliability of the gas pretreatment device 20.

[0201] Optionally, the fourth temporary storage structure 124 includes a second temporary storage body and a second partition plate. The second partition plate is installed in the second temporary storage body to partition the inner chamber of the second temporary storage body into a first sub-storage chamber and a second sub-storage chamber. The first sub-storage chamber is located below the fourth filler 121, and the second sub-storage chamber communicates with the third main pipeline 125. The second partition plate has an overflow hole or forms an overflow portion between the second partition plate and the second temporary storage body. The first sub-storage chamber communicates with the second sub-storage chamber through the overflow hole or the overflow portion. In this way, due to the above installation of the second partition plate, it is ensured that the impurities that enter the first sub-storage chamber after being sprayed by the third spraying structure 122 are sufficiently precipitated in the first sub-storage chamber, avoiding the impurities from entering the third main pipeline 125 and clogging the third spraying structure 122, and improving the spraying efficiency of the third spraying structure 122. Also, due to the above installation, the overflow mode of the liquid in the fourth temporary storage structure 124 is made more diverse to meet different usage needs and operating conditions, and the processing flexibility of the operator is also improved.

[0202] Optionally, the fourth filler 121 includes a plurality of second sub-filler plates. Two adjacent second sub-filler plates are alternately installed to form a flow path. Turbulence protrusions or turbulence recesses located in the flow path are installed on the surface of each second sub-filler plate. In this way, when the gas and liquid mixed with impurities gather in the flow path, due to the above installation of the turbulence protrusions or turbulence recesses, the gas generates turbulence here, further increasing the contact area between the gas and the liquid. Thereby, it is ensured that the impurities mixed in the gas come into contact with the liquid as much as possible and are washed into the fourth temporary storage structure 124 by the liquid.

[0203] In other embodiments not shown, the gas pretreatment device 20 is a filter net or a filter film. In this way, due to the above installation, the processing cost and processing difficulty of the gas pretreatment device 20 are reduced.

[0204] Optionally, the bottom surface of the third temporary storage structure 134 has a flow guiding inclined surface. In this way, due to the above installation, the solution gathers at a relatively low position on the bottom surface within the third temporary storage structure 134, making it easier for the solution to enter the second main pipeline 135, and avoiding the solution from accumulating in dead corners within the third temporary storage structure 134 and increasing the cleaning difficulty for the operator.

[0205] In this embodiment, the bottom surface of the third temporary storage structure 134 is an inclined surface. In this way, due to the above installation, the bottom surface of the third temporary storage structure 134 becomes easier to process, reducing the processing cost of the gas absorption system.

[0206] In other embodiments not shown in the drawings, the bottom surface of the third temporary storage structure 134 is a conical surface.

[0207] In this embodiment, the fourth temporary storage structure 124 and the third liquid supply device have the same structure, thereby reducing the number of structures of the gas absorption system and making it easier for the operator to perform attachment, detachment, and maintenance on the gas absorption system.

[0208] Note that the relationship between the fourth temporary storage structure 124 and the third liquid supply device is not limited to this and can be adjusted according to the operating conditions and usage needs. Optionally, the fourth temporary storage structure 124 communicates with the third liquid supply device, and the third liquid supply device provides water into the third spray structure 122, temporarily stores the water and impurities flowing from the fourth filler 121 within the fourth temporary storage structure 124, and then puts it back into the third spray structure 122 to continue spraying.

[0209] Optionally, the gas absorption assembly 30 further includes a first liquid level gauge, which is installed within the third temporary storage structure 134 and is used to detect the height of the solution within the third temporary storage structure 134. When the liquid level is lower than the first liquid level value, water is replenished to the third temporary storage structure 134 by a water replenishing pump, and when the liquid level reaches the predetermined liquid level, the water replenishment stops.

[0210] Optionally, the gas pretreatment device 20 further includes a second liquid level gauge, which is installed in the fourth temporary storage structure 124 and used to detect the water level of the fourth temporary storage structure 124. When the liquid level is lower than the second liquid level value, water is replenished into the fourth temporary storage structure 124 by a water replenishing pump, and when the liquid level reaches a predetermined liquid level, the water replenishment is stopped.

[0211] As shown in FIGS. 6 and 7, the housing 10 has a storage chamber 13, and the gas absorption assembly 30 is located within the storage chamber 13. The gas absorption system further includes a blower 60 and a gear box 70. The blower 60 is connected to the housing 10 and is located at the exhaust port 12 to deflect the gas discharged from the exhaust port 12 . The gear box 70 is drivingly connected to the fan to operate the fan.

[0212] In this embodiment, the gas flows in from one side of the gas absorption system. The third temporary storage structure 134 and the fourth temporary storage structure 124 are adjacent to each other and separated by concrete, and the interior of the third temporary storage structure 134 is corrosion-proof treated.

[0213] Optionally, there is one third filler 132, or there are a plurality of third fillers 132, and the plurality of third fillers 132 are installed at intervals along the longitudinal direction of the gas absorption system.

[0214] Optionally, the fourth filler 121 is one or Fourth filler 121 there are a plurality of them, and the plurality of Fourth filler 121 are installed at intervals along the longitudinal direction of the gas absorption system.

[0215] Optionally, the first spraying structure 31 has a spraying density of 0-20 m 3 / m 2 ×h and uses deionized water.

[0216] From the above description, the above embodiments of the present application achieve the following technical effects.

[0217] By spraying an alkaline solution using the first spray structure, the alkaline solution flowing out from the first spray structure is made to chemically react with carbon dioxide gas in the gas to absorb the carbon dioxide gas. In the above process, the solution that has chemically reacted with the carbon dioxide gas is temporarily stored by the first temporary storage structure, and the solution temporarily stored in the first temporary storage structure is made to flow out again by the first spray structure, thereby realizing the recycling of the solution. In the process of collecting carbon dioxide gas, the hydroxide concentration and / or carbonate concentration in the solution in the first temporary storage structure is detected in real time, and an alkaline solution or water is replenished into the first temporary storage structure based on the hydroxide concentration and carbonate concentration, and the concentrations of hydroxide and carbonate in the solution at the final state are accurately controlled by means of alkaline solution replenishment or water replenishment, so as to meet the requirements of the subsequent electrolysis process, reduce the energy consumption of the entire system, and further solve the problem that it is difficult to control the carbon dioxide gas collection efficiency and the overall energy consumption of the carbon dioxide collection system in the prior art, thereby improving the collection efficiency of the carbon dioxide collection system. In the process of detecting the hydroxide concentration and / or carbonate concentration in the solution in the first temporary storage structure in real time, when it is detected that the hydroxide concentration is m or less and the carbonate concentration is n, the first pump or the third pump is controlled to stop operating, and the solution temporarily stored in the first temporary storage structure is put into the electrolysis device for electrolysis.

[0218] Note that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless otherwise clearly indicated in the context. Also, when terms such as "including" and / or "having" are used in this specification, it indicates the presence of a configuration, step, operation, component, assembly, and / or a combination thereof.

[0219] Note that terms such as "first" and "second" in the specification, claims, and the above drawings of this application are for distinguishing similar objects and do not necessarily explain a specific order or sequence. In addition, data used in this way can be appropriately exchanged so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0220] The above description is only a preferred embodiment of this application and does not limit this application. For those skilled in the art, various changes and modifications are possible to this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application should be included within the protection scope of this application.

Description of Reference Numerals

[0221] 10 housing 11 air inlet 12 exhaust port 13 accommodation chamber 20 gas pretreatment device 21 second filler 22 second spraying structure 23 second water collector 24 second temporary storage structure 25 second pipeline 26 second pump 30 gas absorption assembly 31 first spraying structure 32 first filler 33 first water collector 34 first temporary storage structure 35 first pipeline 36 first pump 40 gas transport device 51 first main pipeline 52 second branch pipeline 60 air duct 70 gear case 80 staircase 121 fourth filler 122 third spraying structure 123 fourth water collector 124 fourth temporary storage structure 125 Third main pipeline 126 Fourth pump P 132 Third filling material 133 Third water collector 134 Third temporary storage structure 135 Second main pipeline 136 Third pump

Claims

1. A carbon dioxide capture method, comprising: spraying an alkaline solution by a first spray structure so that the alkaline solution flowing out of the first spray structure chemically reacts with carbon dioxide gas in the gas to absorb the carbon dioxide gas; temporarily storing the solution chemically reacted with the carbon dioxide gas by a first temporary storage structure, and flowing out the solution temporarily stored in the first temporary storage structure by the first spray structure; detecting in real time the hydroxide concentration and / or carbonate concentration in the solution in the first temporary storage structure, and replenishing an alkaline solution or water into the first temporary storage structure based on the hydroxide concentration and the carbonate concentration; in the process of detecting in real time the hydroxide concentration and / or carbonate concentration in the solution in the first temporary storage structure, when it is detected that the hydroxide concentration is m or less and the carbonate concentration is n, controlling the first pump or the third pump to stop operating, and putting the solution temporarily stored in the first temporary storage structure into an electrolysis device for electrolysis; A carbon dioxide capture method, characterized in that.

2. The method of flowing out the solution temporarily stored in the first temporary storage structure by the first spray structure is: starting the first pump or the third pump, and pumping the solution temporarily stored in the first temporary storage structure from a pipeline into the first spray structure by the first pump or the third pump. The carbon dioxide capture method according to claim 1, characterized in that.

3. The method of replenishing an alkaline solution or water into the first temporary storage structure based on the hydroxide concentration and / or the carbonate concentration is: when it is detected that the hydroxide concentration is less than m and the carbonate concentration is less than n, replenishing an alkaline solution into the first temporary storage structure; when it is detected that the hydroxide concentration is m or less and the carbonate concentration is greater than n, replenishing water into the first temporary storage structure. The carbon dioxide capture method according to claim 1, characterized in that.

4. The method of detecting in real time the hydroxide concentration in the solution in the first temporary storage structure is: Feed the solution into a potentiometric titration apparatus, and titrate a standard acid with calibrated H ＋ concentration into the solution. During the titration process, continuously stir and record the volume of the added standard acid and the first derivative curve of the solution potential. Perform this until the first derivative curve of the solution potential reaches the first peak value, and calculate the hydroxide ion concentration of the solution using the volume of the standard acid consumed up to this point. The method includes the step of The carbon dioxide capture method according to claim 1, characterized in that.

5. The method of detecting in real time the carbonate concentration in the solution in the first temporary storage structure is: Feed the solution into a potentiometric titration apparatus, and add a standard acid with calibrated H ＋ concentration dropwise to the solution. During the titration process, continuously stir and record the volume of the added standard acid and the first derivative curve of the solution potential until the first derivative curve of the solution potential reaches the first peak value. Record the volume of the standard acid consumed up to this point as V1, and H ＋ continue to add the standard acid with calibrated H concentration dropwise to the solution. During the titration process, continuously stir and record the volume of the added standard acid and the first derivative curve of the solution potential until the first derivative curve of the solution potential reaches the second peak value. Record the volume of the standard acid consumed up to this point as V2, and calculate the carbonate concentration of the solution using the difference between V2 and V1, including the step of The carbon dioxide capture method according to claim 1, characterized in that...

6. m is 0.1 mol / L or more and 5 mol / L or less, and / or n is 1 mol / L or more and 6 mol / L or less. The carbon dioxide capture method according to claim 1, characterized in that...

7. m is 0.3 mol / L or more and 2 mol / L or less, and / or n is 2 mol / L or more and 5.5 mol / L or less. The carbon dioxide capture method according to claim 6, characterized in that...

8. In the process of putting the solution temporarily stored in the first temporary storage structure into the electrolysis device for electrolysis, the carbon dioxide capture method includes: Further including the step of controlling the production molar ratio and / or production amount of carbon dioxide gas and hydrogen gas per unit time in the electrolysis device by adjusting the amount of electricity applied to the electrolysis device. The carbon dioxide capture method according to claim 1, characterized in that...

9. The method for adjusting the amount of electricity applied to the electrolysis device is: Obtaining a predetermined amount of electricity value Q applied to the electrolysis device when the production molar ratio of the carbon dioxide gas and the hydrogen gas becomes 1, and increasing nQ to the predetermined amount of electricity value Q to adjust the production molar ratio of the carbon dioxide gas and the hydrogen gas, including the step of where n = 1, 2, 3,..., N and N ≤ n. The carbon dioxide capture method according to claim 8, characterized in that...

10. In the process of adjusting the production molar ratio of the carbon dioxide gas and the hydrogen gas, the carbon dioxide capture method includes: Detecting the content of the electrolyte in the electrolysis device in real time, and further including the step of adding electrolyte to the electrolysis device when the content of the electrolyte is less than a predetermined value. The electrolyte is an alkali metal sulfate, an alkali metal nitrate, or an alkali metal phosphate. The carbon dioxide capture method according to claim 9, characterized in that...

11. The method for temporarily storing the solution that has chemically reacted with the carbon dioxide gas by the first temporary storage structure is: Installing and operating at least two first temporary storage structures by switching, each of the first temporary storage structures being capable of selectively temporarily storing the solution that has chemically reacted with the carbon dioxide gas, and when the carbonate ion concentration in one of the first temporary storage structures reaches a predetermined concentration value, stopping this temporary storage structure and starting another first temporary storage structure, including the step of The carbon dioxide capture method according to claim 1, characterized in that...

12. A gas absorption system used for absorbing carbon dioxide gas in the environment and using the carbon dioxide capture method according to any one of Claims 1 to 11, wherein the gas absorption system includes a housing (10) having an air inlet (11) and an exhaust port (12) communicating with the air inlet (11), wherein the exhaust port (12) is located above the air inlet (11), or the air inlet (11) and the exhaust port (12) are oppositely installed in the horizontal direction, and a gas pretreatment device (20) installed in the housing (10) and located at the air inlet (11) for filtering impurities in the gas entering the air inlet (11), a gas absorption assembly (30) installed in the housing (10) and located downstream of the gas pretreatment device (20), the gas absorption assembly (30) includes a first liquid supply device and a first spray structure (31), the first liquid supply device is used to communicate with the first spray structure (31) to provide an alkaline solution, and the alkaline solution flowing out of the first spray structure (31) chemically reacts with carbon dioxide gas in the gas to absorb the carbon dioxide gas, characterized in that it is a gas absorption system.

13. The gas absorption assembly (30) further includes a first packing material (32) oppositely installed at the exhaust port (12) and located below the first spray structure (31), and a first water collector (33) located above the first spray structure (31), characterized in that it is the gas absorption system according to Claim 12.

14. The gas absorption assembly (30) further includes a first temporary storage structure (34) located below the first packing material (32) for temporarily storing the solution chemically reacted with the carbon dioxide gas, a first pipeline (35) with both ends communicating with the first temporary storage structure (34) and the first spray structure (31) respectively, and a first pump (36) installed in the first pipeline (35) for pumping the solution entering the first temporary storage structure (34) into the first spray structure (31), characterized in that it is the gas absorption system according to Claim 13.

15. The gas pretreatment device (20) includes a second packing material (21) oppositely installed at the air inlet (11), and a second liquid supply device, A second spray structure (22) located above the second filler (21) and communicating with the second liquid supply device. The gas absorption system according to claim 12, characterized in that.

16. The gas pretreatment device (20) Further includes a second water collector (23) installed opposite to the second filler (21). The second water collector (23) is one, or The second water collector (23) is plural, at least one of the second water collectors (23) is located on the first side of the second filler (21), and at least one other of the second water collectors (23) is located on the second side of the second filler (21). The gas absorption system according to claim 15, characterized in that.

17. The gas pretreatment device (20) A second temporary storage structure (24) located below the second filler (21) and used to temporarily store the liquid flowing out of the second filler (21). A second pipeline (25) with both ends communicating with the second spray structure (22) and the second temporary storage structure (24) respectively. Further includes a second pump (26) installed in the second pipeline (25) and used to pump the liquid entering the second temporary storage structure (24) into the second spray structure (22). The gas absorption system according to claim 15, characterized in that.

18. The second temporary storage structure (24) A first temporary storage body, A first partition plate installed in the first temporary storage body and partitioning the inner chamber of the first temporary storage body into a first sub-storage chamber and a second sub-storage chamber. The first sub-storage chamber is located below the second filler (21), the second sub-storage chamber communicates with the second pipeline (25), the first partition plate has an overflow hole or forms an overflow part with the first temporary storage body, and the first sub-storage chamber communicates with the second sub-storage chamber through the overflow hole or the overflow part. The gas absorption system according to claim 17, characterized in that.

19. The second filler (21) includes a plurality of first sub-filler plates, two adjacent first sub-filler plates are alternately installed to form a flow path, and on the surface of each first sub-filler plate, a turbulent flow protrusion or a turbulent flow recess located in the flow path is installed. The gas absorption system according to claim 15, characterized in that.

20. The gas absorption system further includes a filter net or a filter film located between the gas pretreatment device (20) and the air inlet (11). The gas absorption system according to claim 12, characterized in that.

21. The housing (10) has a storage chamber (13), the air inlet (11) communicates with the exhaust port (12) through the storage chamber (13), and the gas absorption assembly (30) is located in the storage chamber (13). The air inlet (11) is one and the gas pretreatment device (20) is one, or The air inlets (11) are plural, the plural air inlets (11) are installed around the storage chamber (13), the gas pretreatment devices (20) are plural, and the plural gas pretreatment devices (20) are installed in a one-to-one correspondence with the plural air inlets (11). The gas absorption system according to claim 12, characterized in that.

22. The gas absorption system A gas transport device (40) installed at the exhaust port (12) and / or the air inlet (11) and used to transport gas from the air inlet (11) to the outside of the gas absorption system, and A first detection device installed in the first temporary storage structure (34) and used to detect the concentration of carbonate ions in the solution, further included, When the detection value of the first detection device reaches a first predetermined concentration value, the gas transport device (40) is controlled to stop operating. The gas absorption system according to claim 14, characterized in that.

23. The gas transport device (40) A fan installed at the exhaust port (12), and / or A compressor installed at the air inlet, included. The gas absorption system according to claim 22, characterized in that.

24. The gas absorption system A second detection device installed in the first temporary storage structure (34) and used to detect the concentration of hydroxide ions in the solution, further included, When the detection value of the second detection device is smaller than a second predetermined concentration value, the first pump (36) is controlled to start. The gas absorption system according to claim 14, characterized in that.

25. The bottom surface of the first temporary storage structure (34) has a flow guiding inclined surface. The gas absorption system according to claim 14, characterized in that.

26. The gas absorption system further includes a waterwheel and a generator. The waterwheel is located below the first temporary storage structure (34), and the liquid located within the first temporary storage structure (34) flows to the waterwheel via the diversion slope. The generator is connected to the waterwheel. The gas absorption system according to claim 25, characterized in that.

27. The gas absorption system further includes a stirring device installed within the first temporary storage structure (34). The gas absorption system according to claim 14, characterized in that.

28. The gas absorption system further includes a gas transport device (40) installed at the exhaust port (12) and / or the intake port (11) and used to transport gas from the intake port (11) to the outside of the gas absorption system. The gas absorption system according to claim 12, characterized in that.

29. The gas transport device (40) includes a fan installed at the exhaust port (12) and / or a compressor installed at the intake port. The gas absorption system according to claim 28, characterized in that.

30. The gas absorption assembly (30) includes a third filler (132) located below the first spray structure (31) and a third water collector (133) installed opposite to the third filler (132), wherein the third water collector (133) is located between the exhaust port (12) and the third filler (132) or between the third filler (132) and the gas pretreatment device (20). The gas absorption system according to claim 12, characterized in that.

31. The gas absorption assembly (30) further includes a third temporary storage structure (134). The third temporary storage structure (134) is located below the third filler (132) and is used to temporarily store the solution that has chemically reacted with the carbon dioxide gas. The third temporary storage structure (134) is one or a plurality of the third temporary storage structures (134) are selectively usable. The gas absorption system according to claim 30, characterized in that.

32. There are a plurality of the third temporary storage structures (134). The gas absorption assembly (30) includes a second main pipeline (135) with a first end communicating with the first spray structure (31), a plurality of third branch pipelines installed in one-to-one correspondence with the plurality of the third temporary storage structures (134), and a plurality of second control valves installed in one-to-one correspondence with the plurality of the third branch pipelines. Both ends of each of the third branch pipelines communicate with the corresponding third temporary storage structure (134) and the second end of the second main pipeline (135), respectively. Each of the second control valves controls the opening and closing state of the corresponding third branch pipeline. At any given time, at least one of the second control valves is in an open state. The gas absorption system according to claim 31, characterized in that.

33. The gas absorption assembly (30) further includes a third detection device installed in the second main pipeline (135) and used to detect the concentration of carbonate ions in the solution in the second main pipeline (135). When the detection value of the third detection device reaches a predetermined concentration value, the third branch pipeline corresponding to the third temporary storage structure (134) in use is controlled by at least one second control valve to be in a blocked state, and at least one other third temporary storage structure (134) is controlled by at least one other second control valve to be in a use state. The gas absorption system according to claim 32, characterized in that.

34. The gas absorption assembly (30) further includes a third pump (136) installed in the second main pipeline (135) or the third branch pipeline and used to pump the solution that has entered the third temporary storage structure (134) into the first spray structure (31). The gas absorption system according to claim 32, characterized in that.

35. The gas pretreatment device (20) includes a fourth filler (121) installed opposite to the air inlet (11), a third liquid supply device, a third spray structure (122) located above the fourth filler (121) and communicating with the third liquid supply device, and a fourth water collector (123) installed opposite to the fourth filler (121). The gas absorption system according to claim 12, characterized in that.

36. The fourth water collector (123) is one, or the fourth water collector (123) is plural, at least one of the fourth water collectors (123) is located on the first side of the fourth filler (121), and at least one other fourth water collector (123) is located on the second side of the fourth filler (121). The gas absorption system according to claim 35, characterized in that.

37. The gas pretreatment device (20) includes a fourth temporary storage structure (124) located below the fourth filler (121) and used to temporarily store the liquid flowing out of the fourth filler (121). A third main pipeline (125) with both ends communicating with the third spray structure (122) and the fourth temporary storage structure (124) respectively; A fourth pump (126) installed in the third main pipeline (125) and used to pump the liquid that has entered the fourth temporary storage structure (124) into the third spray structure (122); The gas absorption system according to claim 35, characterized in that.

38. The fourth temporary storage structure (124) A second temporary storage body; A second partition plate installed in the second temporary storage body and partitioning the inner chamber of the second temporary storage body into a third sub-storage chamber and a fourth sub-storage chamber; The third sub-storage chamber is located below the fourth filler (121), the fourth sub-storage chamber communicates with the third main pipeline (125), the second partition plate has an overflow hole or forms an overflow part between the second partition plate and the second temporary storage body, and the third sub-storage chamber communicates with the fourth sub-storage chamber through the overflow hole or the overflow part; The gas absorption system according to claim 37, characterized in that.

39. The fourth filler (121) includes a plurality of second sub-filler plates, two adjacent second sub-filler plates are alternately installed to form a flow path, and on the surface of each second sub-filler plate, a turbulent flow protrusion or a turbulent flow recess located in the flow path is installed; The gas absorption system according to claim 35, characterized in that.

40. The gas absorption system further includes an electrolysis device, the electrolysis device is located downstream of the first temporary storage structure, the electrolysis device electrolyzes the carbonic acid solution discharged from the first temporary storage structure to generate potassium hydroxide and hydrogen gas at the cathode of the electrolysis device, and a mixed gas of oxygen gas and carbon dioxide at the anode of the electrolysis device; The potassium hydroxide is used for carbon dioxide absorption in the gas absorption system; The gas absorption system according to claim 12, characterized in that.

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