Photocatalytic and electrochemical coupling sulfur hexafluoride degradation device

Abstract

The application discloses a kind of photocatalysis and electrochemical coupling sulfur hexafluoride degradation device, it is related to technical field, including electrochemical component and photochemical component, electrochemical component includes power supply, cathode piece, anode piece, first container and second container, cathode piece and anode piece are located first container and second container respectively, and connect power supply, first container is communicated with second container.Light chemical component includes photochemical reactor, photocatalyst and light source, photochemical reactor is equipped with photochemical cavity, the outlet of photochemical cavity is communicated first container, light source and photocatalyst are located photochemical cavity, and the ultraviolet light emitted by light source can be photocatalyzed under the catalysis of photocatalyst to sulfur hexafluoride entering photochemical cavity and carry out photochemical reaction degradation.The application is degraded to sulfur hexafluoride by electrochemical component and photochemical component together for multiple times, and the pollution degree of gas discharged finally is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas degradation, in particular to a sulfur hexafluoride degradation device coupled with photocatalysis and electrochemistry. BACKGROUND

[0002] Sulfur hexafluoride has excellent insulation and arc extinguishing performance and is widely used in electrical equipment. However, SF6 is a strong greenhouse gas with a very high global warming potential (GWP), about 23500 times that of carbon dioxide, and is extremely stable in the atmosphere, can exist for a long time, and has a significant impact on global climate warming. Therefore, developing an efficient SF6 degradation method and device is of great significance for environmental protection.

[0003] The prior art with publication number CN118320586A discloses an electrochemical device for degrading sulfur hexafluoride waste gas, which includes an electrolytic cell and two washing assemblies, including a cathode area, an anode area, and a cation exchange membrane separating the cathode area and the anode area, a cathode is arranged in the cathode area, and an anode is arranged in the anode area, the cathode and the anode are respectively electrically connected with the negative electrode and the positive electrode of a direct current power supply; the washing assembly includes a washing column and a spraying assembly, two washing columns are respectively communicated with the cathode area and the anode area, the washing column of the cathode area is communicated with the anode area through a gas pipeline, the spraying assembly is connected with the washing column and the cathode area or the anode area, and the spraying assembly is used for extracting electrolyte and spraying into the washing column. This application can perform countercurrent washing on the escaped or incompletely degraded SF6 and other intermediate gas products, thereby realizing deep degradation of SF6.

[0004] However, the prior art still has deficiencies, for example, the electrochemical device only degrades sulfur hexafluoride through electrochemical reaction, the degradation capacity is limited, and the gas discharged after the last degradation still contains gas with a high degree of pollution. SUMMARY

[0005] The present application aims to overcome the above technical deficiencies and proposes a sulfur hexafluoride degradation device coupled with photocatalysis and electrochemistry, which solves the technical problem that the electrochemical device in the prior art only degrades sulfur hexafluoride through electrochemical reaction, the degradation capacity is limited, and the gas discharged after the last degradation still contains gas with a high degree of pollution.

[0006] To achieve the above technical purpose, the present application adopts the following technical scheme:

[0007] The present application provides a sulfur hexafluoride degradation device coupled with photocatalysis and electrochemistry, which includes:

[0008] An electrochemical assembly comprises a power source, a cathode component, an anode component, a first container and a second container, the cathode component and the anode component are respectively located in the first container and the second container and connected to the power source, the first container is in communication with the second container; and

[0009] A photochemical assembly comprises a photo-reaction container, a photocatalyst and a light source, the photo-reaction container is provided with a photo-reaction cavity, the outlet of the photo-reaction cavity is in communication with the first container, the light source and the photocatalyst are both located in the photo-reaction cavity, and the ultraviolet light emitted by the light source can degrade the sulfur hexafluoride entering the photo-reaction cavity under the catalysis of the photocatalyst.

[0010] In some embodiments, the photo-reaction container is located inside the first container, and a holding cavity for containing electrolyte is formed between the outer wall of the photo-reaction container and the inner wall of the first container.

[0011] In some embodiments, the photochemical assembly further comprises an aeration head, the aeration head is arranged at the outlet of the photo-reaction cavity, and the outlet of the photo-reaction cavity is arranged at the bottom of the holding cavity.

[0012] In some embodiments, the photochemical assembly further comprises a plurality of transparent partitions, the plurality of transparent partitions are arranged in an alternating and spaced manner in the photo-reaction cavity and form a continuous arc-shaped channel, and the arc-shaped channel is in communication with the outlet of the photo-reaction cavity.

[0013] In some embodiments, the photocatalyst and the light source are arranged on opposite sides of the transparent partition.

[0014] In some embodiments, the electrochemical assembly further comprises a connecting container and a cation exchange membrane, two ends of the connecting container are in communication with the first container and the second container, and the cation exchange membrane is located in the connecting container and separates the first container and the second container.

[0015] In some embodiments, the photochemical assembly has two groups, one group of the photochemical assembly is located in the first container, and the other group of the photochemical assembly is located in the second container and is in communication with the gas outlet of the first container through a connecting pipe.

[0016] In some embodiments, the photocatalysis and electrochemical coupling sulfur hexafluoride degradation device further comprises a tail gas detection assembly, the tail gas detection assembly comprises a concentration detector, a three-way valve and a tail gas treatment component, the concentration detector is connected to the outlet of the second container and the three-way valve, and the three-way valve is connected to the tail gas treatment component.

[0017] In some embodiments, the tail gas treatment device comprises a lye absorption tower and an adsorbent packing, the adsorbent packing is located in the lye absorption tower, the lye absorption tower has a sodium hydroxide solution, and the adsorbent packing is active alumina.

[0018] In some embodiments, the photocatalysis and electrochemical coupling sulfur hexafluoride degradation device further comprises a sulfur hexafluoride cylinder, an inert gas cylinder and a confluence pipe, one end of the confluence pipe is connected to the sulfur hexafluoride cylinder and the inert gas cylinder, and the other end of the confluence pipe is connected to the inlet of the photo-reaction container.

[0019] Compared with the prior art, the photocatalysis and electrochemical coupling sulfur hexafluoride degradation device provided by the present application has a photo-reaction cavity that can communicate with the sulfur hexafluoride to be degraded. After the sulfur hexafluoride enters the photo-reaction cavity, the sulfur hexafluoride is subjected to a photocatalytic degradation reaction to degrade the sulfur hexafluoride into a secondary pollution gas. The gas then flows into the first container and is subjected to an electrochemical reaction with the electrolyte and the cathode of the first container to degrade the gas again, so that the gas is degraded into a gas with a lower pollution degree. Since the first container is connected to the second container, the gas can enter the second container again and be subjected to an electrochemical reaction with the electrolyte and the anode of the second container to degrade the gas again. The present application degrades the sulfur hexafluoride multiple times through the electrochemical assembly and the photochemical assembly, and the finally discharged gas has a low pollution degree. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the photocatalysis and electrochemical coupling sulfur hexafluoride degradation device provided by the present application;

[0021] Figure 2 is a top view schematic diagram of the first container. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0023] In order to solve the technical problem that the electrochemical device in the prior art only degrades the sulfur hexafluoride through an electrochemical reaction, the degradation capacity is limited, and the finally discharged gas still contains a gas with a high pollution degree, the present application provides a photocatalysis and electrochemical coupling sulfur hexafluoride degradation device, which can degrade the sulfur hexafluoride multiple times through the electrochemical assembly and the photochemical assembly, and the finally discharged gas has a low pollution degree.

[0024] Please refer to Figure 1 , Figure 1Figure 1 is a structural schematic diagram of a photocatalysis and electrochemical coupling sulfur hexafluoride degradation device according to an embodiment of the present application. The photocatalysis and electrochemical coupling sulfur hexafluoride degradation device comprises an electrochemical assembly and a photochemical assembly. The electrochemical assembly comprises a power supply 1, a cathode 2, an anode 3, a first container 4, and a second container 5. The cathode 2 and the anode 3 are respectively located in the first container 4 and the second container 5, and are connected to the positive and negative poles of the power supply 1. The first container 4 is in communication with the second container 5.

[0025] The photochemical assembly comprises a photochemical reaction container 6 and a light source 7. The photochemical reaction container 6 is provided with a photochemical reaction cavity 61. The outlet of the photochemical reaction cavity 61 is in communication with the first container 4. The light source 7 is located in the photochemical reaction cavity 61 and is used to emit ultraviolet light to irradiate the sulfur hexafluoride in the photochemical reaction cavity 61. The light source 7 comprises a light column 71 and a light belt 72 (shown in Figure 2). The light column 71 can emit light in all directions, and the light belt 72 can assist in light emission to enhance illumination. Figure 2

[0026] The photochemical reaction container 6 of the present embodiment is used to connect the sulfur hexafluoride to be treated. The sulfur hexafluoride flows into the photochemical reaction cavity 61 of the photochemical reaction container 6. The light source 7 can emit ultraviolet light to perform photocatalytic degradation reaction on the sulfur hexafluoride in the photochemical reaction cavity 61, so as to degrade the sulfur hexafluoride into secondary pollution gas. The secondary pollution gas flows into the first container 4 again, and electrochemical reaction occurs between the secondary pollution gas, the electrolyte in the first container 4, and the cathode 2, so as to degrade the gas again, so that the gas is degraded into a gas with lower pollution degree. Since the first container 4 is in communication with the second container 5, the gas can enter the second container 5 again, and electrochemical reaction occurs between the gas, the electrolyte in the second container 5, and the anode 3, so as to degrade the gas again. The present application degrades the sulfur hexafluoride multiple times through the electrochemical assembly and the photochemical assembly, and finally degrades the discharged gas to a low pollution degree, which does not have a great impact on the environment.

[0027] The cathode 2 is preferably a nano-copper impregnated carbon fiber modified electrode. This electrode has unique physical and chemical properties, which can significantly improve the efficiency of electrochemical reaction. The anode 3 is preferably a platinum electrode. The good electrical conductivity and chemical inertness of the platinum electrode help to maintain the stable progress of the anode reaction.

[0028] In one embodiment, as shown in Figure 1, the photochemical reaction container 6 is located inside the first container 4. An accommodation cavity 41 for accommodating electrolyte is formed between the outer wall of the photochemical reaction container 6 and the inner wall of the first container 4. Figure 1 In one embodiment, as shown in Figure 1, the photochemical reaction container 6 is located inside the first container 4. An accommodation cavity 41 for accommodating electrolyte is formed between the outer wall of the photochemical reaction container 6 and the inner wall of the first container 4.

[0029] Figure 1 ​​, the photochemical assembly further comprises an aeration head 8, the aeration head 8 is arranged at the outlet of the light reaction cavity 61, the outlet of the light reaction cavity 61 is arranged close to the bottom of the accommodating cavity 41. In the embodiment, by arranging the aeration head 8, the gas generated in the light reaction cavity 61 and the residual sulfur hexafluoride can be fully introduced into the accommodating cavity 41 to contact the alkaline solution, further enhancing the gas-liquid contact area and improving the reaction efficiency.

[0030] In one embodiment, referring to Figure 1 and Figure 2 , the photochemical assembly further comprises a plurality of transparent partitions 62, the plurality of transparent partitions 62 are arranged in staggered intervals in the light reaction cavity 61 and form a continuous arc-shaped channel 63, the arc-shaped channel 63 communicates with the outlet of the light reaction cavity 61. In the embodiment, the light source 7 is arranged on one of the transparent partitions 62, or the light source 7 can be arranged in multiple, and the light source 7 is arranged on each transparent partition 62, the light source 7 can emit ultraviolet light to irradiate the sulfur hexafluoride to decompose the sulfur hexafluoride.

[0031] Further, referring to Figure 2 , the photochemical assembly further comprises a photocatalyst 9, the photocatalyst 9 and the lamp strip 72 are arranged on opposite sides of the transparent partition 62. In the embodiment, the photocatalyst 9 is arranged to improve the decomposition efficiency of the sulfur hexafluoride, the photocatalyst 9 in the embodiment is a polyisoprene nanoparticle, the polyisoprene nanoparticle is loaded on a porous carrier material activated carbon fiber, and the activated carbon fiber is installed on the other side of the transparent partition 62 of the light reaction cavity to increase the contact area of the photocatalyst and the sulfur hexafluoride and improve the photocatalytic efficiency. The polyisoprene nanoparticle generates reducing free radicals (mainly allyl free radicals and excited state C=C bonds) under ultraviolet irradiation through double bond rupture, hydrogen extraction and chain rupture path

[0032] R is an allyl free radical, R1 is an excited state C=C bond, and all generated decomposition products are SO2F2, SiF4, SF4, SiH4, HF and SO2, etc.

[0033] In one embodiment, referring to Figure 1The electrochemical assembly further includes a connecting container 10 connected to the first container 4 and the second container 5 at both ends, and a cation exchange membrane 11 located in the connecting container 10 and separating the first container 4 and the second container 5. In this embodiment, the cation exchange membrane is a Nafion 117 type cation exchange membrane, which has high selectivity and good ion conduction performance, and can effectively realize ion separation and transmission. The cathode 2 and the anode 3 are respectively connected to the negative electrode and the positive electrode of the power supply 1 through wires. Such a connection mode enables electrons to flow smoothly between the cathode 2 and the power supply 1 during the electrochemical reaction, thereby driving the redox reaction to proceed. In addition, the power supply 1 is a direct current stabilized power supply, which has the function of adjustable voltage and current. This feature enables the electrochemical system to flexibly adjust the voltage and current parameters according to different reaction conditions and requirements. By precisely controlling the voltage and current, the reaction rate and product selectivity can be optimized, and the performance and efficiency of the entire device can be improved.

[0034] In one embodiment, referring to Figure 1 The photochemical assembly has two groups, one of which is located in the first container 4, and the other is located in the second container 5 and is connected to the gas outlet of the first container 4 through the connecting pipe 12. In this embodiment, the gas generated after the reaction of sulfur hexafluoride in the first container 4 can enter the photochemical assembly in the second container 5 through the connecting pipe 12 and undergo photocatalytic reaction again to degrade the gas. After the degradation, the gas is fully contacted with the electrolyte in the second container after being aerated by the aeration head, improving the reaction efficiency. The connecting pipe 12 is provided with a control valve 121 for controlling the opening and closing of the connecting pipe 12 to control whether the gas generated in the first container 5 enters the second container 6.

[0035] The electrolyte 51 in the second container 5 is a silver ion-containing sulfuric acid solution, and silver ions will undergo oxidation reaction in the anode reaction to generate corresponding products. The selection and configuration of this electrolyte are based on the in-depth understanding and optimization design of the electrochemical reaction mechanism, aiming to realize an efficient sulfur hexafluoride degradation process.

[0036] In one embodiment, referring to Figure 1, the photocatalysis and electrochemistry coupling sulfur hexafluoride degradation device further comprises a tail gas detection assembly, the tail gas detection assembly comprises a concentration detector 13, a three-way valve 14, a tail gas treatment component 15 and an alarm 21, the concentration detector 13 is connected with the outlet of the second container 5 and the three-way valve 14, the three-way valve 14 is connected with the tail gas treatment component 15, and the alarm 21 is connected with the concentration detector 13. In the embodiment, the tail gas detection assembly is arranged to detect whether there is still a large amount of harmful gas in the tail gas after the sulfur hexafluoride is treated by photocatalysis and electrochemistry. The concentration detector 13 is used to detect the concentration of the harmful gas, when the concentration of the harmful gas exceeds the standard, the alarm 21 gives an alarm, and the three-way valve 14 controls the switch direction, so that the tail gas flows into the tail gas treatment component 15 to absorb the tail gas, thereby avoiding air pollution caused by the tail gas. When the concentration detector 13 detects that the harmful gas in the tail gas does not exceed the standard, the three-way valve 14 controls the tail gas to be directly discharged.

[0037] In one of the embodiments, referring to Figure 1 The tail gas treatment component comprises a lye absorption tower 16 and an adsorbent filler 17, the adsorbent filler 17 is located in the lye absorption tower 16, the lye absorption tower 16 has a sodium hydroxide solution, and the adsorbent filler 17 is active alumina. In the embodiment, the sodium hydroxide solution is used to absorb the acid gas such as sulfur dioxide and hydrogen fluoride in the tail gas after the reaction. The adsorbent bed is filled with active alumina, which is used to further adsorb the residual harmful gas, so as to ensure that the tail gas meets the discharge standard.

[0038] In one of the embodiments, referring to Figure 1 The photocatalysis and electrochemistry coupling sulfur hexafluoride degradation device further comprises a sulfur hexafluoride cylinder 18, an inert gas cylinder 19 and a confluence pipe 20, the sulfur hexafluoride cylinder 18 is connected with one end of the confluence pipe 20, the inert gas cylinder 19 is connected with the other end of the confluence pipe 20, and the other end of the confluence pipe 20 is connected with the inlet of the light reaction container 6. In the embodiment, the sulfur hexafluoride cylinder 18 stores sulfur hexafluoride, and the inert gas cylinder 19 stores helium. The sulfur hexafluoride and the helium enter the confluence pipe 20 together, are mixed, and then enter the light reaction container 6 together to perform photocatalysis reaction. A first pressure reducing valve 181, a first flow meter 182 and a first electromagnetic valve 183 are sequentially arranged on a line through which the sulfur hexafluoride cylinder 18 is connected with the confluence pipe 20. The first pressure reducing valve 181 is used to adjust the gas pressure of the sulfur hexafluoride cylinder 18, the first flow meter 182 is used to adjust the output speed of the sulfur hexafluoride, and the first electromagnetic valve 183 is used to control the output or non-output of the sulfur hexafluoride.

[0039] A second pressure reducing valve 191, a second flow meter 192 and a second electromagnetic valve 193 are sequentially arranged on a line through which the inert gas cylinder 19 is connected with the confluence pipe 20. The second pressure reducing valve 191 is used to adjust the gas pressure of the inert gas cylinder 19, the second flow meter 192 is used to adjust the output speed of the helium, and the second electromagnetic valve 193 is used to control the output or non-output of the helium.

[0040] The total electromagnetic valve 201 is arranged on the confluence pipe 20, and the total electromagnetic valve 201 can be used to control the mixed gas of sulfur hexafluoride and helium to enter or not to enter the light reaction container 6.

[0041] In order to better understand the present application, the following is combined with Figure 1 The technical solutions of the present application are described in detail:

[0042] The light catalysis and electrochemical coupling sulfur hexafluoride degradation device provided by the present application is used, the gas supply source, the sulfur hexafluoride cylinder 18 and the inert gas cylinder 19 respectively store sulfur hexafluoride and helium, the first flowmeter 182 and the second flowmeter 192 accurately control the flow of the two, so that the sulfur hexafluoride and helium are preliminarily mixed in a certain proportion through the pipeline and then transported to the gas inlet of the light reaction container 6. Before the gas is introduced, the power supply 1 is turned on, the working voltage is set to 4.0V, and after waiting for ten minutes, the gas is introduced. The initial gas flow of sulfur hexafluoride is 8ml / min, the initial gas flow of helium is 800ml / min, and the gas is subjected to light catalysis and electrochemical coupling reaction.

[0043] After the mixed gas is subjected to light catalysis reaction in the light reaction container 6, the sulfur hexafluoride molecules are gradually decomposed into SO2F2, SiF4, SF4, SiH4, HF and SO2 and other more easily degradable substances.

[0044] In the electrochemical system, the cathode member 2 of the first container 4 adopts a nano copper impregnated carbon fiber modified electrode 11, the anode member 3 of the second container 5 adopts a platinum electrode 13, a Nafion117 type cation exchange film 11 is installed between the first container 4 and the second container 5, the cathode member 2 and the anode member 3 are respectively connected with the negative electrode and the positive electrode of the direct current stabilized power supply 1, the power supply 1 can adjust the voltage and the current, and by accurately controlling the voltage and the current, the reaction rate and the product selectivity can be optimized. The electrolyte of the first container 4 is potassium hydroxide solution 41, and the electrolyte of the second container 5 is silver ion containing sulfuric acid solution 51. After the electrochemical reaction, the sulfur hexafluoride waste gas and the intermediate product which are not completely degraded by the light catalysis reaction are further degraded; part of the intermediate product which is not degraded enters the light catalysis assembly of the second container 5 to be degraded again. Then, the formed intermediate product is degraded again in the second container 5, and the degraded product enters the concentration detector. After detection, under this working condition, the final sulfur hexafluoride degradation rate reaches 95%, and the degradation effect can be kept stable within eight hours of continuous reaction, and the tail gas basically does not contain toxic and harmful gases such as sulfur dioxide and hydrogen fluoride. If the concentration of sulfur hexafluoride in the tail gas is too high, the gas inlet amount of helium can be appropriately increased.

[0045] After a period of operation, it is found through the concentration detector 13 that the sulfur hexafluoride degradation effect decreases slightly, and the alarm 21 gives an alarm. The operator adjusts the voltage and the current in time to optimize the reaction conditions.

[0046] Electrocatalytic reaction:

[0047] The chemical reaction occurring in the first container is:

[0048] 6X + + 3 SF6 + 12 HO2 - + 3 H2O → 6X 2+ + SOF2↑ + SO2↑ + 6 OF2↑ + SF4↑ + 18 OH -

[0049] X can be Ni, Co or Cu.

[0050] The chemical reaction occurring in the second container is:

[0051] 6 Ag 2+ + SF4 + SOF2 + SO2 + 9 H2O → 6 Ag + + 3 SO4 2- + 6 HF + 12 H +

[0052] 6 OF2 + 6 H2O → 12 HF + 6 O2↑

[0053] The total reaction equation of the electrocatalytic degradation of sulfur hexafluoride is as follows:

[0054] 3 SF6 + 12 HO2 - + 6 H + → 3 SO4 2- + 18 HF + 6 O2↑

[0055] The above examples are only part of the examples of the present application, and in actual application, the parameters of the device can be adjusted according to the specific situation to achieve the best degradation effect.

[0056] The specific embodiments of the present application described above do not constitute a limitation on the protection scope of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A photocatalytic and electrochemical coupling sulfur hexafluoride degradation device, characterized in that, include: An electrochemical assembly includes a power source, a cathode, an anode, a first container, and a second container. The cathode and the anode are located in the first container and the second container, respectively, and are connected to the power source. The first container and the second container are in communication. A photochemical component includes a photoreaction container, a photocatalyst, and a light source. The photoreaction container is provided with a photoreaction chamber, and the outlet of the photoreaction chamber is connected to the first container. The light source and the photocatalyst are both located in the photoreaction chamber. The ultraviolet light emitted by the light source can photodegrade sulfur hexafluoride entering the photoreaction chamber under the catalysis of the photocatalyst. The photoreaction container is located inside the first container, and a accommodating cavity for containing electrolyte is formed between the outer periphery of the photoreaction container and the inner periphery of the first container. The electrochemical assembly further includes a connecting container and a cation exchange membrane, wherein the two ends of the connecting container are connected to the first container and the second container, and the cation exchange membrane is located in the connecting container and isolates the first container and the second container; The photochemical component has two sets, one set of which is located in the first container and the other set of which is located in the second container, and is connected to the gas outlet of the first container through a connecting pipe.

2. The photocatalytic and electrochemically coupled sulfur hexafluoride degradation device according to claim 1, wherein, The photochemical component also includes an aeration head, which is located at the outlet of the photoreaction chamber, and the outlet of the photoreaction chamber is located at the bottom of the accommodating cavity.

3. The photocatalytic and electrochemically coupled sulfur hexafluoride degradation device of claim 2, wherein, The photochemical component also includes multiple transparent partitions, which are staggered and spaced apart in the photoreaction cavity to form a continuous arc-shaped channel that connects to the outlet of the photoreaction cavity.

4. The photocatalytic and electrochemically coupled sulfur hexafluoride degradation device of claim 3, wherein, The photocatalyst and the light source are located on opposite sides of the transparent partition.

5. The photocatalytic and electrochemically coupled sulfur hexafluoride degradation device of claim 1, wherein, The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device also includes an exhaust gas detection component, which includes a concentration detector, a three-way valve, and an exhaust gas treatment component. The concentration detector is connected to the outlet of the second container and the three-way valve, and the three-way valve is connected to the exhaust gas treatment component.

6. The photocatalytic and electrochemically coupled sulfur hexafluoride degradation device of claim 5, wherein, The exhaust gas treatment unit includes an alkaline absorption tower and an adsorbent packing material. The adsorbent packing material is located in the alkaline absorption tower, which contains a sodium hydroxide solution. The adsorbent packing material is activated alumina.

7. The photocatalytic and electrochemically coupled sulfur hexafluoride degradation device of claim 1, wherein, The photocatalytic and electrochemical coupled sulfur hexafluoride degradation device also includes a sulfur hexafluoride gas cylinder, an inert gas cylinder, and a merging pipe. The sulfur hexafluoride gas cylinder and the inert gas cylinder are connected to one end of the merging pipe, and the other end of the merging pipe is connected to the inlet of the photoreaction container.

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