Sulfur hexafluoride degradation device and method

Abstract

The invention discloses a sulfur hexafluoride degradation device and method. The degradation device comprises collection pressurization equipment, a valve II, heating catalysis equipment, a valve I and a pressure adsorption storage tank which are connected in sequence; the collecting and pressurizing equipment is at least used for collecting mixed sulfur hexafluoride, water vapor and air and conveying the mixed gas to the heating and catalyzing equipment; the heating catalytic equipment is at least used for heating and catalytically degrading sulfur hexafluoride under the atmosphere of water vapor and air; the heating catalysis equipment comprises a front section, a catalyst packing layer and a rear section which are sequentially arranged along the airflow direction; the rear section is provided with a discharge port with a valve IV; the pressure adsorption storage tank is at least used for adsorbing sulfur-oxygen-fluorine by-products generated by degradation of sulfur hexafluoride; the pressure adsorption storage tank comprises a first area, a by-product adsorption layer and a second area which are sequentially arranged along the airflow direction; the second area is connected with the front section through a return pipe; a valve III is arranged on the return pipe; and the return pipe between the second area and the third valve is connected with a regeneration discharge pipe with a fifth valve.

Description

Technical Field

[0001] The invention relates to the technical field of sulfur hexafluoride treatment, and in particular to a sulfur hexafluoride degradation device and method. Background Art

[0002] Sulfur hexafluoride molecule, sulfur hexafluoride gas is colorless, odorless, non-toxic, non-flammable and non-corrosive. It has an octahedral configuration and is non-polar. It is one of the most chemically stable substances known. Therefore, as one of the six greenhouse gases under control, sulfur hexafluoride has a life cycle in the atmosphere of up to 3,200 years, and it is difficult to be effectively treated.

[0003] Sulfur hexafluoride in the atmosphere mainly comes from the application process in the electrical field. Sulfur hexafluoride has strong thermal stability and high breakdown strength, and is widely used in circuit breakers, gas-insulated substations, transformers, etc.; some are used in semiconductor manufacturing and scientific research fields as etching gas, leak detection gas, diffusion model gas, etc. Leakage and exhaust during the use of sulfur hexafluoride cause the concentration of sulfur hexafluoride in the atmosphere to increase. In addition, the degradation process of sulfur hexafluoride is often accompanied by the production of micro-toxic substances such as SO2F2 and SOF2, which cause certain harm to the environment.

[0004] Reducing the use of sulfur hexafluoride, improving the recovery rate, and degrading sulfur hexafluoride gas are three means to reduce emissions. The patent specification with the announcement number CN210434241U discloses a portable sulfur hexafluoride tail gas recovery and purification device, including an equipment interface connected to the gas outlet of the detection instrument, the equipment interface is connected to the buffer tank, the buffer tank is equipped with a differential pressure sensor that stabilizes the flow of sulfur hexafluoride, and an electric needle valve that can control the opening according to the pressure is connected to the back of the buffer tank. An adsorbent tank that can absorb decomposition products such as moisture and sulfide in the gas is connected to the back of the electric needle valve. The adsorbent tank is connected to the compressor inlet through a three-way solenoid valve, and the compressor outlet is connected to the liquefier, and the liquefier is connected to the gas cylinder through a one-way valve and a gas cylinder interface.

[0005] At present, the sulfur hexafluoride recovery and treatment technology needs to be further improved and promoted, and the cost is relatively high. There is still a lot of residual sulfur hexafluoride gas discharged into the atmosphere. In some remote areas, the maintenance waste gas of small gas-insulated equipment is still discharged directly in violation of regulations. In the above situations, there is a partial or complete leakage of sulfur hexafluoride, and the harmless treatment of sulfur hexafluoride needs to be further resolved.

[0006] Chinese patent application CN115999358A discloses a thermal catalytic cycle degradation device for sulfur hexafluoride mixed gas with hydrogen added, which includes a gas mixing tank and a reaction tank. The reaction tank is equipped with a motor and a screw. The reaction tank is divided into two parts by a catalyst layer. The screw crosses the catalyst layer. The power provided by the screw is used to repeatedly cross the catalyst layer to achieve the effect of sulfur hexafluoride degradation. The device not only provides the basic reaction conditions for sulfur hexafluoride degradation, but also creates conditions for sulfur hexafluoride to repeatedly penetrate the catalyst in the same tank body to achieve a better degradation rate. The sulfur hexafluoride degradation efficiency is high. The device has high safety, high degradation rate, and a relatively simple structure, but has the disadvantages of long degradation time and limited application scenarios. Summary of the invention

[0007] The present invention provides a sulfur hexafluoride degradation device and method, which can effectively treat sulfur hexafluoride gas on site and regenerate by-product adsorption materials such as catalysts and activated carbon. It is suitable for the treatment of sulfur hexafluoride gas residual in high-voltage power equipment and the treatment of sulfur hexafluoride gas in scenarios where gas is difficult to collect, such as small gas-insulated equipment in remote areas.

[0008] [1] A sulfur hexafluoride degradation device, comprising a collecting and pressurizing device, a second valve, a heating and catalytic device, a first valve and a pressure adsorption storage tank connected in sequence;

[0009] The collecting and pressurizing device is at least used for collecting the mixed sulfur hexafluoride, water vapor and air and delivering the mixed gas containing sulfur hexafluoride, water vapor and air to the heating catalytic device;

[0010] The heating catalytic device is at least used for heating and catalytically degrading sulfur hexafluoride in a water vapor and air atmosphere; the heating catalytic device comprises a front section, a catalyst packing layer and a rear section arranged in sequence along the air flow direction; the rear section is provided with a discharge port with a valve four;

[0011] The pressure adsorption storage tank is at least used for adsorbing sulfur, oxygen and fluorine byproducts generated by the degradation of sulfur hexafluoride; the pressure adsorption storage tank comprises a first zone, a byproduct adsorption layer and a second zone arranged in sequence along the air flow direction, the second zone is connected to the front section through a reflux pipe; a valve three is provided on the reflux pipe; a regeneration discharge pipe with a valve five is connected to the reflux pipe between the second zone and the valve three.

[0012] In some embodiments, the sulfur hexafluoride degradation device may further include a one-way valve; the two ends of the one-way valve may be connected to the collecting and pressurizing device and valve two respectively, to ensure that the gas flows from the collecting and pressurizing device to valve two to prevent backflow.

[0013] In some embodiments, in the sulfur hexafluoride degradation device, a heating wire may be arranged on the surface of the heating catalytic device, and the heating wire is used to heat the heating catalytic device. Further, a heat preservation protective cover may be installed on the outer surface of the heating wire, and the heat preservation protective cover is used to keep warm and protect the heating catalytic device.

[0014] In some embodiments, the front section, catalyst packing layer and rear section of the sulfur hexafluoride degradation device can be connected by a threaded detachable seal.

[0015] In some embodiments, the catalyst packing layer of the sulfur hexafluoride degradation device may include a fixing sleeve and a catalyst packing; the fixing sleeve is used to support the catalyst packing and can be separated from the catalyst packing. The catalyst packing can be taken out by unscrewing the thread and replaced.

[0016] Furthermore, the two ends of the fixing sleeve may be provided with front internal threads and rear internal threads respectively, the front end connected to the catalyst packing layer may be provided with front external threads, and the rear end connected to the catalyst packing layer may be provided with rear external threads.

[0017] In some embodiments, the front section of the sulfur hexafluoride degradation device may be provided with a front pressure gauge, a front inspection port and a front observation hole.

[0018] In some embodiments, the rear section of the sulfur hexafluoride degradation device may be provided with a rear pressure gauge, a rear inspection port and a rear observation hole.

[0019] In some embodiments, a cooling device may be provided between the valve 1 and the pressure adsorption storage tank of the sulfur hexafluoride degradation device; the cooling device is used to cool the sulfur hexafluoride degradation product from the heating catalytic device to a temperature suitable for adsorption or desorption of the byproduct adsorption layer. The cooling medium in the cooling device may be water at room temperature, etc.

[0020] In some embodiments, the sulfur hexafluoride degradation device and the pressure adsorption tank may be provided with a pressure gauge A. Further, the pressure gauge A may be provided in the second zone. The pressure gauge A may display the mixed gas pressure in the pressure adsorption tank and guide the working status of the collection pressurization equipment and each valve.

[0021] In some embodiments, in the sulfur hexafluoride degradation device, a drain port may be provided at the bottom of the pressure adsorption tank, and a pressure release valve may be provided at the top. The drain port may be manually opened regularly to drain water. The pressure release valve is used to protect the pressure adsorption tank to prevent excessive pressure.

[0022] In some embodiments, the sulfur hexafluoride degradation device may further include a loading vehicle; the collecting and pressurizing device, the heating and catalytic device, and the pressure adsorption storage tank may all be arranged on the loading vehicle. Optionally, the collecting and pressurizing device is fixedly mounted on the loading vehicle via a fixed base 1. Optionally, the heating and catalytic device is fixedly mounted on the loading vehicle via a front fixed base corresponding to the front section and a rear fixed base corresponding to the rear section. Optionally, the pressure adsorption storage tank is fixedly mounted on the loading vehicle via a fixed base 2.

[0023] In some embodiments, in the sulfur hexafluoride degradation device, the byproduct adsorption layer may be an activated carbon layer.

[0024] Each valve involved in the sulfur hexafluoride degradation device described in the present invention can be independently an electric pressure control valve.

[0025] In the sulfur hexafluoride degradation device of the present invention, the catalyst filler in the catalyst filler layer may be a thermal catalytic degradation catalyst.

[0026] [2] Use of the sulfur hexafluoride degradation device described in [1] in degrading sulfur hexafluoride.

[0027] [3] A sulfur hexafluoride degradation method, using the sulfur hexafluoride degradation device described in [1].

[0028] [3] The sulfur hexafluoride degradation method may include:

[0029] Phase I: valves 1 and 2 are opened, valves 3, 4 and 5 are closed, sulfur hexafluoride, water vapor and air are sucked into the collecting pressurizing equipment, and are conveyed to the heating catalytic equipment after pressurization. The mixed gas containing sulfur hexafluoride, water vapor and air passes through the catalyst packing layer to perform thermal catalytic degradation of sulfur hexafluoride. The degradation products enter the pressure adsorption storage tank, and the sulfur, oxygen and fluorine byproducts generated by the degradation of sulfur hexafluoride are adsorbed and removed by the byproduct adsorption layer;

[0030] Phase II: After a period of time in Phase I, the collecting and pressurizing equipment stops running, valves three and four are opened, valves one, two and five are closed, and the mixed gas in the pressure adsorption tank is pressed into the heating catalytic equipment through the reflux pipe under residual pressure, passes through the catalyst packing layer for secondary thermal catalytic degradation, and is discharged through the discharge port.

[0031] The sulfur hexafluoride degradation method may also include stage III:

[0032] After the end of stage II, valves one, two and five are opened, valves three and four are closed, and the collecting and pressurizing equipment inhales nitrogen to purge the catalyst packing layer and the by-product adsorption layer, thereby activating and regenerating the catalyst packing layer and the by-product adsorption layer.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] In view of the fact that residual sulfur hexafluoride gas after sulfur hexafluoride recovery of high-voltage insulation equipment and the maintenance waste gas of small gas insulation equipment in remote areas are still illegally discharged directly, the present invention provides a vehicle-mounted sulfur hexafluoride degradation device and method, which can solve the sulfur hexafluoride emission problem of small facilities on the spot. At the same time, the present invention improves the sulfur hexafluoride degradation efficiency by making sulfur hexafluoride contact the catalyst for multiple times for thermal catalytic degradation, and the residual sulfur hexafluoride concentration in the exhaust gas is lower. In addition, by adding activated carbon and other adsorption processes, the content of sulfur, oxygen, and fluorine byproducts such as SO2F2 and SOF2 in the exhaust gas can be effectively reduced. At the same time, the activation and regeneration of catalysts and byproduct adsorption materials such as activated carbon are taken into account. Sulfur, oxygen, and fluorine byproducts such as SO2F2 and SOF2 can be centrally treated after adsorption enrichment-desorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the overall structure of a sulfur hexafluoride degradation device of the present invention;

[0036] Figure 2 This is a schematic diagram of the main structure of a sulfur hexafluoride degradation device of the present invention;

[0037] Figure 3 It is a partial cross-sectional schematic diagram of a heating catalytic device in a sulfur hexafluoride degradation device of the present invention;

[0038] Figure 4 It is a partial internal cross-sectional schematic diagram of a heating catalytic device in a sulfur hexafluoride degradation device of the present invention;

[0039] Figure 5 It is a schematic cross-sectional view of a catalyst layer of a heating catalytic device in a sulfur hexafluoride degradation device of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0041] The terms "connection" and "installation" in the present invention should be understood in a broad sense, and may refer to a fixed connection, a detachable connection, a rigid connection, or a flexible connection. A person skilled in the art can understand the meaning of the above terms in the present invention according to the specific circumstances.

[0042] The disclosure below provides different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. The application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the application provides various specific processes and examples of materials, but those of ordinary skill in the art may appreciate the application of other processes and / or the use of other materials.

[0043] Reference Figures 1 to 5 A sulfur hexafluoride degradation device includes a loading vehicle 24 and a collecting and pressurizing device 2, a one-way valve 7, a valve 2 37, a heating and catalytic device 5, a mixed gas delivery pipe 19 and a pressure adsorption storage tank 6 which are arranged on the loading vehicle 24 and are connected in sequence. The one-way valve 7 is used to ensure that the gas flows from the collecting and pressurizing device 2 to the valve 2 37 to prevent backflow. A valve 15 is provided on the mixed gas delivery pipe 19, and both ends of the valve 15 are respectively connected to the heating and catalytic device 5 and the pressure adsorption storage tank 6 through the mixed gas delivery pipe 19.

[0044] The collecting and pressurizing device 2 is at least used to collect mixed sulfur hexafluoride, water vapor and air and to pressurize and deliver the mixed gas containing sulfur hexafluoride, water vapor and air to the heating catalytic device 5. The collecting and pressurizing device 2 is fixedly installed on the loading vehicle 24 through a fixed base 25. The air inlet end of the collecting and pressurizing device 2 is connected to a four-way, and the other three ports of the four-way are respectively connected to the sulfur hexafluoride delivery pipe 1, the water vapor delivery pipe 3 and the air delivery pipe 4. The other end of the sulfur hexafluoride delivery pipe 1 can be connected to a high-voltage power device or other equipment containing sulfur hexafluoride. The air inlet end of the collecting and pressurizing device 2 can also be connected to a nitrogen delivery pipe for providing nitrogen for purging.

[0045] The heating catalytic device 5 is at least used for heating and catalytically degrading sulfur hexafluoride under a water vapor and air atmosphere. A heating wire 16 is arranged on the surface of the heating catalytic device 5, and the heating wire 16 is used to heat the heating catalytic device 5. A heat preservation protective cover 23 is installed on the outer surface of the heating wire 16, and the heat preservation protective cover 23 is used to keep warm and protect the heating catalytic device 5. The heating catalytic device 5 includes a front section 27, a catalyst packing layer 12 and a rear section 28 arranged in sequence along the air flow direction; the rear section 28 is provided with a discharge port 9 with a valve 4 18. The heating catalytic device 5 is fixedly installed on the loading vehicle 24 through a front fixed base 11 corresponding to the front section 27 and a rear fixed base 30 corresponding to the rear section 28. The front section 27, the catalyst packing layer 12 and the rear section 28 are connected by a threaded detachable seal. The front section 27 is provided with a front pressure gauge 8, a front inspection port 10 and a front observation hole 17; the end of the front section 27 connected to the catalyst packing layer 12 is provided with a front external thread 20. The catalyst packing layer 12 includes a fixing sleeve 22 and a catalyst packing 33; the fixing sleeve 22 is used to support the catalyst packing 33 and can be separated from the catalyst packing 33; the fixing sleeve 22 is provided with a front internal thread 21 and a rear internal thread 35 at both ends. The rear section 28 is provided with a rear pressure gauge 13, a rear inspection port 29 and a rear observation hole 31; the rear section 28 is provided with a rear external thread 34 at one end connected to the catalyst packing layer 12. The catalyst packing 33 can be taken out by unscrewing the thread and replaced.

[0046] The pressure adsorption storage tank 6 is fixedly installed on the loading vehicle 24 through the fixed base 26. The pressure adsorption storage tank 6 is at least used to adsorb sulfur, oxygen and fluorine byproducts generated by the degradation of sulfur hexafluoride. The pressure adsorption storage tank 6 includes a first zone 44, a byproduct adsorption layer 39 and a second zone 45 arranged in sequence along the air flow direction, wherein the byproduct adsorption layer 39 is an activated carbon layer, and the second zone 45 is connected to the front section 27 through a reflux pipe 42; a valve 38 is provided on the reflux pipe 42; a regeneration discharge pipe 43 with a valve 5 41 is connected to the reflux pipe 42 between the second zone 45 and the valve 3 38. The pressure adsorption storage tank 6 is provided with a pressure gauge A14, which is arranged in the second zone 45. The pressure gauge A14 can display the pressure of the mixed gas in the pressure adsorption storage tank 6 and guide the working status of the collection pressurization equipment 2 and each valve. A drain port 36 is provided at the bottom of the pressure adsorption storage tank 6, and a pressure release valve 32 is provided at the top. The drain port 36 can be manually opened regularly for drainage. The pressure release valve 32 is used to protect the pressure adsorption storage tank 6 to prevent excessive pressure.

[0047] A cooling device 40 is provided between the valve 15 and the pressure adsorption storage tank 6; the cooling device 40 is used to cool the sulfur hexafluoride degradation product from the heating catalytic device 5 to a temperature suitable for adsorption or desorption by the byproduct adsorption layer 39. The cooling medium in the cooling device 40 can be water at room temperature, etc. For example, the cooling device 40 can be a cooling water tank, and the mixed gas delivery pipe 19 between the valve 15 and the pressure adsorption storage tank 6 can be partially immersed in the normal temperature water in the cooling water tank, so that the sulfur hexafluoride degradation product in the mixed gas delivery pipe 19 can be cooled to the required temperature of the pressure adsorption storage tank 6.

[0048] Each valve involved in the above-mentioned sulfur hexafluoride degradation device can be independently an electric pressure control valve.

[0049] In the above sulfur hexafluoride degradation device, the catalyst filler 33 in the catalyst filler layer 12 may be a thermal catalytic degradation catalyst.

[0050] Using the above Figures 1 to 5 The sulfur hexafluoride degradation device shown in the figure performs a sulfur hexafluoride degradation method. The sulfur hexafluoride degradation method comprises:

[0051] Phase I: valve one 15 and valve two 37 are opened, valve three 38, valve four 18 and valve five 41 are closed, sulfur hexafluoride, water vapor and air are collected and sucked into the pressurizing device 2, and are conveyed to the heating catalytic device 5 after pressurization, the heating wire 16 works, and the heating catalytic device 5 is continuously heated and kept warm, and the mixed gas containing sulfur hexafluoride, water vapor and air passes through the catalyst packing layer 12 to perform thermal catalytic degradation of sulfur hexafluoride, and the degradation product is cooled by the cooling device 40 and enters the pressure adsorption storage tank 6, and the sulfur, oxygen and fluorine byproducts such as SO2F2 and SOF2 generated by the degradation of sulfur hexafluoride are adsorbed and removed by the byproduct adsorption layer 39;

[0052] Stage II: After stage I is carried out for a period of time or the pressure gauge A14 reaches the set value, the collecting and pressurizing device 2 stops running, valve three 38 and valve four 18 are opened, valve one 15, valve two 37 and valve five 41 are closed, the heating wire 16 works, and the heating catalytic device 5 is continuously heated and kept warm. The mixed gas in the pressure adsorption storage tank 6 is pressed into the heating catalytic device 5 through the reflux pipe 42 under residual pressure, passes through the catalyst packing layer 12 for secondary thermal catalytic degradation, and is discharged through the discharge port 9, completing one cycle of sulfur hexafluoride degradation;

[0053] Stage III: After the end of stage II, valve 1 15, valve 2 37 and valve 5 41 are opened, valve 3 38 and valve 4 18 are closed, and the heating wire 16 is operated to continuously heat and keep the heating catalytic device 5 warm, for example, the temperature can be kept at 600-800° C. The nitrogen gas inhaled by the pressurizing device 2 is collected to purge the catalyst packing layer 12 and the by-product adsorption layer 39, so as to activate and regenerate the catalyst packing layer 12 and the by-product adsorption layer 39. In stage III, the cooling device 40 may not be operated.

[0054] In addition, it should be understood that after reading the above description of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A sulfur hexafluoride degradation device, characterized in that: It comprises a collecting and pressurizing device (2), a valve 2 (37), a heating and catalytic device (5), a valve 1 (15) and a pressure adsorption storage tank (6) which are connected in sequence; The collecting and pressurizing device (2) is at least used to collect the mixed sulfur hexafluoride, water vapor and air and to deliver the mixed gas containing sulfur hexafluoride, water vapor and air to the heating and catalytic device (5); The heating catalytic device (5) is at least used for heating and catalytically degrading sulfur hexafluoride in a water vapor and air atmosphere; the heating catalytic device (5) comprises a front section (27), a catalyst packing layer (12) and a rear section (28) arranged in sequence along the air flow direction; the rear section (28) is provided with a discharge port (9) with a valve four (18); The pressure adsorption storage tank (6) is at least used for adsorbing sulfur, oxygen and fluorine byproducts generated by the degradation of sulfur hexafluoride; the pressure adsorption storage tank (6) comprises a first zone (44), a byproduct adsorption layer (39) and a second zone (45) arranged in sequence along the gas flow direction; the second zone (45) is connected to the front section (27) via a reflux pipe (42); a valve three (38) is provided on the reflux pipe (42); and a regeneration discharge pipe (43) with a valve five (41) is connected to the reflux pipe (42) between the second zone (45) and the valve three (38).

2. The sulfur hexafluoride degradation device according to claim 1, characterized in that: The sulfur hexafluoride degradation device also includes a one-way valve (7); the two ends of the one-way valve (7) are respectively connected to the collecting and pressurizing device (2) and the second valve (37), so as to ensure that the gas flows from the collecting and pressurizing device (2) to the second valve (37) to prevent backflow.

3. The sulfur hexafluoride degradation device according to claim 1, characterized in that: A heating wire (16) is arranged on the surface of the heating catalytic device (5), and the heating wire (16) is used to heat the heating catalytic device (5); A heat-insulating protective sleeve (23) is installed on the outer surface of the heating wire (16), and the heat-insulating protective sleeve (23) is used for heat preservation and protection of the heating catalytic device (5); The front section (27), the catalyst packing layer (12) and the rear section (28) are detachably sealed and connected via threads; The front section (27) is provided with a front pressure gauge (8), a front inspection port (10) and a front observation hole (17); one end of the front section (27) connected to the catalyst packing layer (12) is provided with a front external thread (20); The catalyst packing layer (12) comprises a fixed sleeve (22) and a catalyst packing (33); the fixed sleeve (22) is used to support the catalyst packing (33) and can be separated from the catalyst packing (33); the fixed sleeve (22) is provided with a front internal thread (21) and a rear internal thread (35) at both ends thereof; The rear section (28) is provided with a rear pressure gauge (13), a rear inspection port (29) and a rear observation hole (31); and one end of the rear section (28) connected to the catalyst packing layer (12) is provided with a rear external thread (34).

4. The sulfur hexafluoride degradation device according to claim 1, characterized in that: A cooling device (40) is provided between the valve 1 (15) and the pressure adsorption storage tank (6); the cooling device (40) is used to cool the sulfur hexafluoride degradation product from the heating catalytic device (5) to a temperature suitable for adsorption or desorption by the by-product adsorption layer (39).

5. The sulfur hexafluoride degradation device according to claim 1, characterized in that: The pressure adsorption storage tank (6) is provided with a pressure gauge A (14), and the pressure gauge A (14) is arranged in the second zone (45); A drainage port (36) is provided at the bottom of the pressure adsorption storage tank (6), and a pressure release valve (32) is provided at the top.

6. The sulfur hexafluoride degradation device according to claim 1, characterized in that: The sulfur hexafluoride degradation device also includes a loading vehicle (24); the collecting and pressurizing device (2), the heating and catalytic device (5) and the pressure adsorption storage tank (6) are all arranged on the loading vehicle (24); The collecting and pressurizing device (2) is fixedly mounted on the loading vehicle (24) via a fixed base (25); The heating catalytic device (5) is fixedly mounted on the loading vehicle (24) via a front fixed base (11) corresponding to the front section (27) and a rear fixed base (30) corresponding to the rear section (28); The pressure adsorption storage tank (6) is fixedly mounted on the loading vehicle (24) via a second fixed base (26).

7. The sulfur hexafluoride degradation device according to claim 1, characterized in that: The byproduct adsorption layer (39) is an activated carbon layer.

8. Use of the sulfur hexafluoride degradation device according to any one of claims 1 to 7 in degrading sulfur hexafluoride.

9. A method for degrading sulfur hexafluoride, characterized in that: A sulfur hexafluoride degradation device according to any one of claims 1 to 7; The sulfur hexafluoride degradation method comprises: Phase I: valve one (15) and valve two (37) are opened, valve three (38), valve four (18) and valve five (41) are closed, and the pressurizing device (2) absorbs sulfur hexafluoride, water vapor and air, and conveys them to the heating catalytic device (5) after pressurization. The mixed gas containing sulfur hexafluoride, water vapor and air passes through the catalyst packing layer (12) to perform thermal catalytic degradation of sulfur hexafluoride. The degradation products enter the pressure adsorption storage tank (6), and the sulfur, oxygen and fluorine byproducts generated by the degradation of sulfur hexafluoride are adsorbed and removed by the byproduct adsorption layer (39); Stage II: After a period of time in stage I, the collecting and pressurizing device (2) stops operating, valve three (38) and valve four (18) are opened, valve one (15), valve two (37) and valve five (41) are closed, and the mixed gas in the pressure adsorption storage tank (6) is pressed into the heating catalytic device (5) through the reflux pipe (42) under residual pressure, passes through the catalyst packing layer (12), undergoes secondary thermal catalytic degradation, and is discharged through the discharge port (9).

10. The sulfur hexafluoride degradation method according to claim 9, characterized in that: The sulfur hexafluoride degradation method also includes stage III: After the completion of stage II, valve one (15), valve two (37) and valve five (41) are opened, valve three (38) and valve four (18) are closed, and the collecting and pressurizing device (2) inhales nitrogen to purge the catalyst packing layer (12) and the by-product adsorption layer (39), thereby activating and regenerating the catalyst packing layer (12) and the by-product adsorption layer (39).

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