Device for capturing carbon dioxide generated in sodium hydroxide production process

Abstract

The utility model relates to a device for capturing carbon dioxide generated in a sodium hydroxide production process, which comprises a pre-capturing device, a circulating device, a power device and a capturing tower, and is characterized in that the pre-capturing device is externally connected with a first conveying device; the first conveying device is used for conveying carbon dioxide generated in the sodium hydroxide production process to the pre-trapping device, the pre-trapping device and the circulating device are further externally connected with a second conveying device, and the trapping tower is formed by sequentially and mutually fixing a plurality of reaction cylinders. And the second conveying equipment is used for providing a low-concentration sodium hydroxide solution for the pre-trapping equipment and the circulating equipment. According to the utility model, the low-concentration sodium hydroxide solution is uninterruptedly provided into the circulating equipment through the second conveying equipment, is conveyed to the trapping tower through the power equipment main body, and reacts with the carbon dioxide conveyed by the first conveying equipment to generate sodium carbonate, so that the trapping tower is effectively prevented from being blocked.

Description

Technical Field

[0001] This invention belongs to the field of sodium hydroxide production technology, specifically a device for capturing carbon dioxide generated during the sodium hydroxide production process. Background Technology

[0002] The process of producing sodium hydroxide from saturated brine by electrolysis generates substandard chlorine gas, and waste chlorine gas is also generated during the liquid chlorine filling process. These waste gases cannot be directly introduced into the normal production process; therefore, they need to be collected in a specialized waste gas collection device and absorbed by sodium hydroxide to produce bleaching agents, thus turning waste into valuable resources.

[0003] Traditional waste gas capture devices use sodium hydroxide solution spraying to capture chlorine gas. However, the production process of sodium hydroxide produces carbon dioxide gas containing a small amount of chlorine. This carbon dioxide gas reacts with sodium hydroxide to form soda ash. As the waste gas capture device continues to operate, the concentration of soda ash gradually increases, which may lead to the precipitation of sodium carbonate crystals. This crystals can then clog the inlet or outlet of the waste gas capture device, posing a significant safety hazard to the enterprise and potentially causing the waste gas capture device to malfunction. Summary of the Invention

[0004] In view of this, the present invention provides a device for capturing carbon dioxide generated during the production of sodium hydroxide, in order to solve the above problems.

[0005] An apparatus for capturing carbon dioxide generated during sodium hydroxide production includes a pre-capture device for initial carbon dioxide absorption, a circulation device connected to the pre-capture device, a power device connected to the circulation device and providing power to the circulation device, and a capture tower connected to the power device for capturing carbon dioxide. The pre-capture device includes a pre-capture tank containing a sodium hydroxide solution and a first gas delivery pipe connected to the capture tower for supplying gas to the capture tower. The sodium hydroxide solution and carbon dioxide in the pre-capture tank undergo a preliminary reaction to achieve initial capture of the carbon dioxide. The pre-capture device is connected to a first delivery device, a second delivery device, and a liquid receiving device. The pre-capture device further includes a second gas delivery pipe connected to the first delivery device for transmitting carbon dioxide generated by the first delivery device. The first delivery device transmits carbon dioxide generated during sodium hydroxide production to the pre-capture device. The second delivery device provides a low-concentration sodium hydroxide solution to both the pre-capture device and the circulation device. The liquid receiving device receives soda ash generated within the pre-capture device. The solution and the sodium hydroxide solution overflowing from the circulation device, the circulation device including a circulation tank containing the sodium hydroxide solution, a first conveying pipe connected between the circulation tank and the power equipment for transporting the sodium hydroxide solution, and a second conveying pipe connected between the circulation tank and the collection tower, the power equipment including a power equipment body connected to the first conveying pipe and a third conveying pipe connected between the power equipment body and the collection tower, the power equipment body being used to extract the sodium hydroxide solution in the circulation tank through the first conveying pipe and through the third conveying pipe. The gas is conveyed to the collection tower. The first gas delivery pipe is located at the bottom of the collection tower. The collection tower includes a plurality of reaction cylinders stacked in sequence. Each reaction cylinder includes a cylinder body, a tray disposed in the cylinder body, and a spray assembly. The tray is used to receive the sodium hydroxide solution flowing into the collection tower. The tray also includes a flow hole formed on the tray for the flow of sodium hydroxide solution and carbon dioxide. The spray assembly is spaced apart from the tray and has a plurality of liquid outlet holes. When sodium hydroxide is discharged from the liquid outlet holes, the sodium hydroxide reacts with carbon dioxide to capture the carbon dioxide.

[0006] Furthermore, the pre-collection tank is made of fiberglass material and is sealed.

[0007] Furthermore, the pre-collection device also includes a first level gauge for testing the level of the sodium hydroxide solution in the pre-collection tank.

[0008] Furthermore, the second gas delivery pipe is also provided with a sampling port for sampling the mass of carbon dioxide delivered by the first delivery device.

[0009] Furthermore, the circulation tank is made of fiberglass.

[0010] Furthermore, the circulation device also includes a second level gauge for measuring the level of sodium hydroxide solution in the circulation tank, and a fourth delivery pipe for discharging excess sodium hydroxide solution in the circulation tank to the liquid receiving device.

[0011] Furthermore, the second conveying device continuously replenishes the circulation tank with sodium hydroxide solution to prevent the collection tower from failing to react normally due to insufficient sodium hydroxide solution in the circulation tank.

[0012] Furthermore, the main body of the power equipment is a circulating pump, and one end of the third delivery pipe is connected to the main body of the power equipment, while the other end includes multiple branch pipes.

[0013] Furthermore, the reaction cylinder also includes a diversion pipe communication hole formed on the side wall of the cylinder for the diversion pipe to pass through. The spray assembly includes a main spray pipe and a plurality of spray branch pipes spaced apart on both sides of the main spray pipe and communicating with the main spray pipe. Each spray branch pipe is provided with a plurality of liquid outlet holes.

[0014] Furthermore, the collection tower also includes a valve installed on the collection tower for controlling the direction of gas flow. The collection tower is also externally connected to a chlorine gas delivery pipe for transmitting high-purity chlorine gas and a waste gas collection device for transmitting low-purity chlorine gas. Both the chlorine gas delivery pipe and the waste gas collection device are under negative pressure.

[0015] Compared with existing technologies, the device provided by this utility model for capturing carbon dioxide generated during the production of sodium hydroxide continuously supplies a low-concentration sodium hydroxide solution to the circulation tank via a second conveying device, which is then transported to the capture tower via the main body of the power equipment. The solution reacts with the carbon dioxide gas transported by the first conveying device to generate soda ash. The reaction tanks are fixedly connected by flanges, a connection method that facilitates disassembly and replacement, and allows for easy cleaning of the capture tower, thus effectively preventing blockage. Furthermore, the second conveying device continuously supplies sodium hydroxide solution to the pre-capture tank, avoiding the problem of the sodium hydroxide solution level becoming too low due to periodic discharge from the pre-capture tank, which would render the pre-capture tank ineffective. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the process structure of the device for capturing carbon dioxide generated during the production of sodium hydroxide, provided by this utility model.

[0017] Figure 2 This is a schematic diagram of the capture tower of the device for capturing carbon dioxide generated during the production of sodium hydroxide, provided by this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the cylinder of the device for capturing carbon dioxide generated during the production of sodium hydroxide, provided by this utility model.

[0019] Figure 4 This is a schematic diagram of the reaction cylinder of the device for capturing carbon dioxide generated during the production of sodium hydroxide, provided by this utility model. Detailed Implementation

[0020] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0021] like Figure 1 The diagram shows a structural schematic of an apparatus for capturing carbon dioxide generated during the production of sodium hydroxide, as provided by this utility model. In a specific step of sodium hydroxide production, substandard chlorine gas containing carbon dioxide is generated. The apparatus for capturing carbon dioxide generated during sodium hydroxide production includes a pre-capture device 10 for initial absorption of carbon dioxide, a circulation device 20 connected to the pre-capture device 10, a power device 30 connected to the circulation device 20 and providing power to the circulation device 20, and a capture tower 40 connected to the power device 30 and used for capturing carbon dioxide. It is conceivable that the apparatus for capturing carbon dioxide generated during sodium hydroxide production also includes other functional modules, such as piping components, electrical connection components, waste gas and wastewater treatment devices, etc., which should be known to those skilled in the art and will not be described in detail here.

[0022] The pre-capture device 10 includes a pre-capture tank 11 containing a sodium hydroxide solution, a first gas delivery pipe 12 connected to the capture tower 40 for supplying gas to the capture tower 40, and a second gas delivery pipe 13 connected to the first delivery device 50 described below. The sodium hydroxide solution in the pre-capture tank 11 will undergo a preliminary reaction with the carbon dioxide supplied to the pre-capture tank 11 by the first delivery device 50, thereby performing preliminary capture of the carbon dioxide.

[0023] The pre-collection tank 11 contains a sodium hydroxide solution for initial reaction with carbon dioxide, thereby achieving preliminary absorption of the carbon dioxide. During this process, the carbon dioxide reacts with the sodium hydroxide to produce soda ash. Preferably, the pre-collection tank 11 is made of fiberglass for better corrosion resistance. The pre-collection tank 11 is sealed, and the sodium hydroxide solution within it is discharged periodically. The solution is then replenished via the second conveying device 60 according to the scale value of the first liquid level scale 142. The first gas conveying pipe 12 is used to transport the carbon dioxide gas that has not fully reacted after the initial reaction in the pre-collection tank 11 into the collection tower 40. One end of the first gas conveying pipe 12 is located at the lower part of the collection tower 40, allowing the carbon dioxide to rise naturally from the lower part to the top of the tower, where it reacts with the sodium hydroxide during its ascent for collection.

[0024] The pre-collection device 10 further includes a first level gauge 14 for testing the level of the sodium hydroxide solution in the pre-collection tank 11. Preferably, the first level gauge 14 is a glass tube level gauge. The first level gauge 14 includes two first level terminals 141 located at both ends of the first level gauge 14, and a first level scale 142 located between the two first level terminals 141. The first level terminals 141 are inserted into the pre-collection tank 11 and used to measure the water pressure of the sodium hydroxide solution in the pre-collection tank 11, and the water pressure is converted into a scale value on the first level scale 142 by the first level gauge 14. The amount of sodium hydroxide solution in the pre-collection tank 11 is determined by reading the scale value on the first level scale 142. The first level gauge 14 is an instrument for measuring the level of a liquid, which is prior art and will not be described in detail here.

[0025] The pre-collection device 10 is also connected to a first conveying device 50, a second conveying device 60, and a liquid receiving device 70.

[0026] The first conveying device 50 is used to transfer carbon dioxide generated during the sodium hydroxide production process to the pre-collection device 10. The first conveying device 50 also transfers carbon dioxide generated during the sodium hydroxide production process to the pre-collection device 10 via the second gas conveying pipe 13. The second gas conveying pipe 13 has a sampling port 131 for sampling the gas conveyed by the first conveying device 50. By sampling through the sampling port 131, the purity of chlorine in the gas conveyed by the first conveying device 50 is detected, and based on the purity of the chlorine, the gas is selected to either enter the chlorine conveying pipe 80 or the waste gas collection device 90 described below.

[0027] The second conveying device 60 is used to provide a low concentration of sodium hydroxide solution to the pre-collection device 10 and the circulation device 20.

[0028] The liquid receiving device 70 is used to receive the soda ash solution generated in the pre-collection device 10 and the sodium hydroxide solution overflowing from the circulation device 20 for subsequent use.

[0029] The circulation device 20 includes a circulation tank 21 containing sodium hydroxide solution, a first delivery pipe 22 connected to the power device 30 for conveying sodium hydroxide solution, and a second delivery pipe 23 connected to the collection tower 40.

[0030] Preferably, the circulation tank 21 is made of fiberglass, thus possessing good corrosion resistance. The first conveying pipe 22 connects the circulation tank 21 to the power equipment 30. The second conveying pipe 23 connects the collection tower 40 to the circulation tank 21, allowing the sodium hydroxide solution containing soda ash generated in the collection tower 40 to flow into the circulation tank 21 for subsequent use. Simultaneously, the circulation tank 21 is connected and communicates with both the second conveying device 60 and the liquid receiving device 70; that is, the second conveying device 60 provides the sodium hydroxide solution, and the liquid receiving device 70 receives the sodium hydroxide solution containing soda ash for subsequent use.

[0031] The circulation device 20 further includes a second level gauge 24 for measuring the level of sodium hydroxide solution in the circulation tank 21, and a fourth delivery pipe 25 for discharging excess sodium hydroxide solution in the circulation tank 21 to the liquid receiving device 70. The second level gauge 24 includes second level terminals 241 located at both ends of the second level gauge 24 for measuring the water pressure of the sodium hydroxide solution in the circulation tank 21, and a second level scale 242 located between the two second level terminals 241. The second level gauge 24 has the same structure and function as the first level gauge 13, and will not be described in detail here. During production, to ensure the normal operation of the production process, the second level gauge 24 can prevent the circulation tank 21 from lacking sodium hydroxide solution, thus preventing the collection device from malfunctioning. Since the second delivery device 60 needs to continuously replenish sodium hydroxide solution to the circulation tank 21, when the sodium hydroxide solution in the circulation tank 21 overflows, it can overflow to the liquid receiving device 70 through the fourth delivery pipe 25.

[0032] The power equipment 30 includes a power equipment body 31 connected to the first conveying pipe 22 and a third conveying pipe 32 connected at one end to the power equipment body 31 and at the other end to the collection tower 40.

[0033] The main body 31 of the power equipment can be a circulation pump, which is used to extract the sodium hydroxide solution in the circulation tank 21 through the first delivery pipe 22 and transport it to the collection tower 40 through the third delivery pipe 32. The sodium hydroxide solution transported to the collection tower 40 will react with the carbon dioxide that has been preliminarily purified by the collection tank 11 and is transported to the collection tower 40 through the first gas delivery pipe 12 to capture the carbon dioxide.

[0034] The third delivery pipe 32 is connected at one end to the main body 31 of the power equipment and at the other end to the collection tower 40. The latter end includes multiple branch pipes 321. Sodium hydroxide solution is delivered in layers through these branch pipes 321 to multiple reaction cylinders 41. The number of branch pipes 321 is determined according to actual needs; in this embodiment, there are four branch pipes 321.

[0035] The collection tower 40 includes a plurality of reaction cylinders 41 stacked sequentially. Each reaction cylinder 41 includes a cylinder body 411, a tray 412 disposed within the cylinder body 411, and a spray assembly 413 disposed within the cylinder body 411 and spaced apart from the tray 412. The cylinder body 411 is a hollow cylinder with four sides and one side open. The reaction cylinder 41 also includes a diversion pipe communication hole 414 disposed on the side wall of the cylinder body 411 for connecting and communicating with the diversion pipe 321. The cylinder bodies 411 can be fixed together by flanges and bolts. The tray 412 is used to receive sodium hydroxide solution flowing into the collection tower 40. The tray 412 also includes a flow hole 4121 formed on the tray 412 for the flow of sodium hydroxide solution and carbon dioxide. The spray assembly 413 includes a main spray pipe 4131 and multiple spray branch pipes 4132 spaced apart on both sides of the main spray pipe 4131 and connected to it. Each spray branch pipe 4132 has multiple outlet holes 4133. When sodium hydroxide solution flows into the distribution pipe 321, it first flows through the main spray pipe 4131, then sequentially flows through each of the spray branch pipes 4132, and finally flows out through the outlet holes 4133. This allows the sodium hydroxide solution to flow out evenly from the distribution pipe 321 and react effectively with carbon dioxide. The collection tower 40 is composed of multiple reaction cylinders 41. Preferably, the number of reaction cylinders 41 can be set according to actual needs. In this embodiment, the number of reaction cylinders 41 is four. Since the multiple reaction cylinders 41 are stacked sequentially, they are easy to disassemble and replace, and also easy to clean. It is conceivable that the collection tower 40 is also provided with a cylindrical bottom cover at the bottom of the reaction cylinder 41, and a cylindrical top cover at the top of the reaction cylinder 41. This is current technology and will not be described in detail here. Of course, it should be noted that the first gas delivery pipe 12 is provided on the side wall of the cylindrical bottom cover.

[0036] Carbon dioxide, after preliminary treatment in the pre-collection tank 11, enters the collection tower 40 through the first gas delivery pipe 12. Sodium hydroxide solution in the circulation tank 21 flows through the first delivery pipe 22 and the third delivery pipe 32 via the power supply of the main body of the power equipment 31 before entering the collection tower 40. At this point, any unreacted carbon dioxide reacts again with the sodium hydroxide solution to produce soda ash, thus achieving the reabsorption of carbon dioxide.

[0037] The collection tower 40 is also externally connected to a chlorine gas delivery pipe 80 for transmitting high-purity chlorine gas and a waste gas collection device 90 for transmitting low-purity chlorine gas. Both the chlorine gas delivery pipe 80 and the waste gas collection device 90 are mounted on the cylindrical top cover. If the chlorine gas purity is high, it is collected through the chlorine gas delivery pipe 80 for use in the production of bulk commodity polyvinyl chloride (PVC). If the chlorine gas purity is low, it is collected through the waste gas collection device 90 for use in the production of bleaching agents. Because the chlorine gas delivery pipe 80 and the waste gas collection device 90 are under negative pressure, the chlorine gas moves towards the chlorine gas delivery pipe 80 or the waste gas collection device 90 under pressure. In a specific process of sodium hydroxide production, substandard chlorine gas containing carbon dioxide may be generated. The carbon dioxide in the substandard chlorine gas containing carbon dioxide enters the pre-collection tank 11 through the first conveying device 50 and reacts initially with the sodium hydroxide solution. After the initial reaction, the carbon dioxide in the substandard chlorine gas containing carbon dioxide that has not fully reacted enters the collection tower 40 through the first gas conveying pipe 12 and reacts again with the sodium hydroxide solution to absorb the remaining carbon dioxide. At this point, the gas contains almost no carbon dioxide, only chlorine gas of varying purities.

[0038] The collection tower 40 also includes a valve 42 for controlling the gas flow direction. The valve 42 is a bidirectional valve, capable of opening to both sides. A portion of the gas located in the second gas delivery pipe 13 is sampled through the sampling port 131 to detect the gas purity. The opening direction of the valve 42 is selected based on the detected gas purity, thereby determining the gas flow direction. In this embodiment, the remaining gas collected by the collection tower 40 is chlorine. The sodium hydroxide solution, transported by the power unit 31, enters the collection tower 40 and flows from the end of the collection tower 40 away from the ground to the end closer to the ground under the influence of gravity. The carbon dioxide gas, transported by the first gas delivery pipe 12 and pre-reacted in the pre-collection tank 11, moves from the side of the collection tower 40 closer to the ground to the side farther away from the ground under the suction force provided by the chlorine delivery pipe 80 or the waste gas collection device 90. The flow rate of sodium hydroxide solution conveyed through the power unit 31 can be controlled by the power of the power unit 31 to ensure that the flow rate of sodium hydroxide solution entering the collection tower 40 is not too large. The flow rate of sodium hydroxide solution entering the collection tower 40 is less than the flow rate of sodium hydroxide solution flowing out through the flow hole 4121, thereby ensuring that the sodium hydroxide solution does not completely fill the flow hole 4121 when flowing down, ensuring that carbon dioxide gas can pass through the flow hole 4121 normally, thus ensuring the normal progress of the reaction. Sodium hydroxide reacts with carbon dioxide to produce soda ash. The solubility of soda ash is much lower than that of sodium hydroxide. If the concentration of sodium hydroxide solution is too high or even saturated, soda ash will precipitate during the reaction, which can easily clog the collection tower 40. Therefore, in this embodiment, the sodium hydroxide solution provided by the second conveying device 60 is of low concentration. The low concentration of sodium hydroxide solution provided by the second conveying device 60 can, to a certain extent, avoid clogging the collection tower 40. The sodium hydroxide solution containing soda ash generated in the collection tower 40 flows into the circulation tank 21 through the second conveying pipe 23, and together with the original waste sodium hydroxide solution in the circulation tank 21, it is discharged into the liquid receiving device 70 through the fourth conveying pipe 25 for subsequent use.

[0039] Compared with the prior art, the device provided by this utility model for capturing carbon dioxide generated during the production of sodium hydroxide continuously supplies a low-concentration sodium hydroxide solution to the circulation tank 21 via the second conveying device 60, and then transports it to the capturing tower 40 via the power equipment body 31. The solution reacts with the carbon dioxide gas transported by the first conveying device 50 to generate soda ash. The cylinders 41 are fixedly connected by flanges, a connection method that facilitates disassembly and replacement, and allows for easy cleaning of the capturing tower 40, thus effectively preventing blockage. Furthermore, the second conveying device 60 continuously supplies sodium hydroxide solution to the pre-capture tank 11, thus avoiding the problem of the sodium hydroxide solution level becoming too low due to periodic discharge from the pre-capture tank 11, which would render the pre-capture tank 11 ineffective.

[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A device for capturing carbon dioxide generated during the production of sodium hydroxide, characterized in that: The apparatus for capturing carbon dioxide generated during sodium hydroxide production includes a pre-capture device for initial carbon dioxide absorption, a circulation device connected to the pre-capture device, a power device connected to the circulation device and providing power to the circulation device, and a capture tower connected to the power device for capturing carbon dioxide. The pre-capture device includes a pre-capture tank containing sodium hydroxide solution and a first gas delivery pipe connected to the capture tower for supplying gas to the capture tower. The sodium hydroxide solution and carbon dioxide in the pre-capture tank undergo a preliminary reaction to achieve initial capture of the carbon dioxide. The pre-capture device is connected to a first delivery device, a second delivery device, and a liquid receiving device. The pre-capture device also includes a second gas delivery pipe connected to the first delivery device for transmitting carbon dioxide generated by the first delivery device. The first delivery device transmits carbon dioxide generated during sodium hydroxide production to the pre-capture device. The second delivery device provides a low-concentration sodium hydroxide solution to the pre-capture device and the circulation device. The liquid receiving device receives sodium carbonate solution generated within the pre-capture device. The circulating equipment includes a circulation tank containing the sodium hydroxide solution, a first conveying pipe connected between the circulation tank and the power equipment for transporting the sodium hydroxide solution, and a second conveying pipe connected between the circulation tank and the collection tower. The power equipment includes a power equipment body connected to the first conveying pipe and a third conveying pipe connected between the power equipment body and the collection tower. The power equipment body is used to extract the sodium hydroxide solution from the circulation tank through the first conveying pipe and transport it through the third conveying pipe. The gas is fed to the collection tower. The first gas delivery pipe is located at the bottom of the collection tower. The collection tower includes a plurality of reaction cylinders stacked in sequence. Each reaction cylinder includes a cylinder body, a tray disposed in the cylinder body, and a spray assembly. The tray is used to receive the sodium hydroxide solution flowing into the collection tower. The tray also includes a flow hole formed on the tray for the flow of sodium hydroxide solution and carbon dioxide. The spray assembly is spaced apart from the tray and has a plurality of liquid outlet holes. When sodium hydroxide is discharged from the liquid outlet holes, the sodium hydroxide reacts with carbon dioxide to capture the carbon dioxide.

2. The apparatus for capturing carbon dioxide generated during the production of sodium hydroxide as described in claim 1, characterized in that: The pre-collection tank is made of fiberglass and is sealed.

3. The apparatus for capturing carbon dioxide generated during the production of sodium hydroxide as described in claim 1, characterized in that: The pre-collection device also includes a first level gauge for testing the level of sodium hydroxide solution in the pre-collection tank.

4. The apparatus for capturing carbon dioxide generated during the production of sodium hydroxide as described in claim 1, characterized in that: The second gas delivery pipe is also provided with a sampling port for sampling the mass of carbon dioxide delivered by the first delivery device.

5. The apparatus for capturing carbon dioxide generated during the production of sodium hydroxide as described in claim 1, characterized in that: The circulation tank is made of fiberglass.

6. The apparatus for capturing carbon dioxide generated during the production of sodium hydroxide as described in claim 1, characterized in that: The circulation device also includes a second level gauge for measuring the level of sodium hydroxide solution in the circulation tank, and a fourth delivery pipe for discharging excess sodium hydroxide solution in the circulation tank to the liquid receiving device.

7. The apparatus for capturing carbon dioxide generated during the production of sodium hydroxide as described in claim 1, characterized in that: The second conveying device continuously replenishes the circulation tank with sodium hydroxide solution to prevent the collection tower from failing to react normally due to insufficient sodium hydroxide solution in the circulation tank.

8. The apparatus for capturing carbon dioxide generated during the production of sodium hydroxide as described in claim 1, characterized in that: The main body of the power equipment is a circulating pump, and one end of the third delivery pipe is connected to the main body of the power equipment, while the other end includes multiple branch pipes.

9. The apparatus for capturing carbon dioxide generated during the production of sodium hydroxide as described in claim 8, characterized in that: The reaction cylinder also includes a branch pipe communication hole formed on the side wall of the cylinder for the branch pipe to pass through. The spray assembly includes a main spray pipe and multiple spray branch pipes spaced apart on both sides of the main spray pipe and connected to the main spray pipe. Each spray branch pipe is provided with multiple liquid outlet holes.

10. The apparatus for capturing carbon dioxide generated during the production of sodium hydroxide as described in claim 1, characterized in that: The collection tower also includes a valve installed on the collection tower for controlling the direction of gas flow. The collection tower is also externally connected to a chlorine gas delivery pipe for transmitting high-purity chlorine gas and a waste gas collection device for transmitting low-purity chlorine gas. Both the chlorine gas delivery pipe and the waste gas collection device are under negative pressure.

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