A sulfur hexafluoride degradation apparatus and method

Abstract

The application discloses a sulfur hexafluoride degradation device and method. The degradation device comprises a collecting and pressurizing device, a valve two, a heating and catalyzing device, a valve one and a pressure adsorption storage tank which are connected in sequence; the collecting and pressurizing device is used at least for collecting mixed sulfur hexafluoride, water vapor and air and conveying the mixed gas to the heating and catalyzing device; the heating and catalyzing device is used at least for heating and catalyzing degradation of the sulfur hexafluoride under the atmosphere of the water vapor and the air; the heating and catalyzing device comprises a front section, a catalyst filling layer and a rear section which are arranged in sequence along the airflow direction; the rear section is provided with a discharge port with a valve four; the pressure adsorption storage tank is used at least for adsorbing sulfur oxyfluoride by-products generated in the sulfur hexafluoride degradation; the pressure adsorption storage tank comprises a first area, a by-product adsorption layer and a second area which are arranged in sequence along the airflow direction and are connected with the front section through a reflux pipe; the reflux pipe is provided with a valve three; the reflux pipe between the second area and the valve three is connected with a regeneration discharge pipe with a valve five.

Description

Technical Field

[0001] This invention relates to the field of sulfur hexafluoride treatment technology, and specifically to a sulfur hexafluoride degradation device and method. Background Technology

[0002] Sulfur hexafluoride (SF6) molecules and gases are colorless, odorless, non-toxic, non-flammable, and non-corrosive. They have an octahedral structure, are non-polar, and are among the most chemically stable substances known. As a result, SF6 is one of the six greenhouse gases that are subject to control, with an atmospheric lifespan of up to 3,200 years, and it is difficult to effectively manage.

[0003] Sulfur hexafluoride (SF6) in the atmosphere primarily originates from its applications in the electrical field. SF6 possesses strong thermal stability and high breakdown strength, making it widely used in circuit breakers, gas-insulated substations, and transformers. It is also partially used in semiconductor manufacturing and scientific research as an etching gas, leak detection gas, and diffusion modeling gas. Leaks and venting during SF6 use lead to an increase in atmospheric SF6 concentration. Furthermore, the degradation of SF6 often produces slightly toxic substances such as SO2F2 and SOF2, posing certain environmental hazards.

[0004] Reducing sulfur hexafluoride (SF6) usage, improving recovery rates, and degrading SF6 gas are three means of reducing emissions. Patent specification CN210434241U discloses a portable SF6 tail gas recovery and purification device, including an interface connected to the outlet of a detection instrument. This interface is connected to a buffer tank equipped with a differential pressure sensor to stabilize the SF6 flow rate. An electric needle valve, whose opening can be controlled based on pressure, is connected after the buffer tank. An adsorbent tank, capable of adsorbing moisture and sulfide decomposition products from the gas, is connected after the electric needle valve. The adsorbent tank is connected to the compressor inlet via a three-way solenoid valve. The compressor outlet is connected to a liquefier, which is then connected to a gas cylinder via a one-way valve and a gas cylinder interface.

[0005] Currently, sulfur hexafluoride (SF6) recovery and treatment technologies require further improvement and wider adoption, and the costs are relatively high, with a significant amount of residual SF6 gas still being emitted into the atmosphere. Furthermore, in some remote areas, maintenance exhaust gases from small gas-insulated equipment are still being illegally and directly emitted. In all of these cases, there is partial or complete leakage of SF6, and the harmless treatment of SF6 needs further resolution.

[0006] Chinese patent application CN115999358A discloses a thermocatalytic cyclic degradation device for sulfur hexafluoride (SF6) mixed gas with added hydrogen. It 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 traverses the catalyst layer, and the power provided by the screw causes the mixed gas to repeatedly traverse the catalyst layer, thereby achieving the degradation effect of SF6. This device not only provides the basic reaction conditions for SF6 degradation but also creates conditions that allow SF6 to repeatedly penetrate the catalyst within the same tank to achieve a better degradation rate, resulting in high SF6 degradation efficiency. While this device offers high safety, high degradation rate, and a relatively simple structure, it suffers from drawbacks such as long degradation time and limited application scenarios. Summary of the Invention

[0007] This invention provides a sulfur hexafluoride (SF6) degradation device and method, which can effectively treat SF6 gas on-site and regenerate by-product adsorption materials such as catalysts and activated carbon. It is suitable for treating SF6 gas residues in high-voltage power equipment and SF6 gas in remote areas and other scenarios where gas collection is difficult.

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

[0009] The pressurization and collection equipment is used at least to collect the mixture of sulfur hexafluoride, water vapor and air and to deliver the mixture containing sulfur hexafluoride, water vapor and air to the heated catalytic equipment;

[0010] The heated catalytic device is used at least for the catalytic degradation of sulfur hexafluoride under steam and air atmosphere; the heated catalytic device includes a front section, a catalyst packing layer and a rear section arranged sequentially along the airflow direction; the rear section is provided with an exhaust port with valve four;

[0011] The pressure adsorption tank is used at least to adsorb sulfur, oxygen and fluorine byproducts generated from the degradation of sulfur hexafluoride; the pressure adsorption tank includes a first zone, a byproduct adsorption layer and a second zone arranged sequentially along the airflow direction, the second zone is connected to the front section through a return pipe; a valve three is provided on the return pipe; a regeneration discharge pipe with a valve five is connected to the return 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 a collection and pressurization device and a valve two, respectively, to ensure that the gas flow direction is from the collection and pressurization device to the valve two, and to prevent backflow.

[0013] In some embodiments, the sulfur hexafluoride degradation device may have heating wires arranged on the surface of the heating catalytic device for heating the catalytic device. Furthermore, an insulating protective sleeve may be installed on the outer surface of the heating wires for heat preservation and protection of the heating catalytic device.

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

[0015] In some embodiments, the sulfur hexafluoride degradation device may include a catalyst packing layer comprising a fixing sleeve and catalyst packing; the fixing sleeve supports the catalyst packing and is separable from it. The catalyst packing can be removed and replaced by unscrewing the threads.

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

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

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

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

[0020] In some embodiments, the sulfur hexafluoride degradation device may include a pressure gauge A in the pressure adsorption tank. Furthermore, pressure gauge A may be located in a second zone. Pressure gauge A displays the pressure of the mixed gas inside the pressure adsorption tank, guiding the operation of the collection pressurization equipment and various valves.

[0021] In some embodiments, the sulfur hexafluoride degradation device may have a drain outlet at the bottom of the pressure adsorption tank and a pressure relief valve at the top. The drain outlet can be manually opened periodically to drain water. The pressure relief valve is used to protect the pressure adsorption tank and prevent excessive pressure.

[0022] In some embodiments, the sulfur hexafluoride degradation device may further include a loading vehicle; the collection and pressurization device, the heating and catalytic device, and the pressure adsorption tank may all be mounted on the loading vehicle. Optionally, the collection and pressurization device is fixedly mounted on the loading vehicle via a fixed base one. 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 tank is fixedly mounted on the loading vehicle via a fixed base two.

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

[0024] Each valve involved in the sulfur hexafluoride degradation device described in this invention can be an independently electrically controlled pressure valve.

[0025] In the sulfur hexafluoride degradation device of the present invention, the catalyst packing in the catalyst packing layer can be a thermocatalytic degradation catalyst.

[0026] [2] Application of the sulfur hexafluoride degradation device according to [1] in the degradation of sulfur hexafluoride.

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

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

[0029] Stage I: Valves 1 and 2 are opened, while valves 3, 4, and 5 are closed. The pressurizing equipment draws in sulfur hexafluoride, water vapor, and air, which are then pressurized and transported to the heating catalytic equipment. The mixed gas containing sulfur hexafluoride, water vapor, and air passes through the catalyst packing layer for the thermocatalytic degradation of sulfur hexafluoride. The degradation products enter the pressure adsorption storage tank, where the sulfur, oxygen, and fluorine byproducts generated during 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 collection and pressurization equipment stops operating, valves three and four open, and valves one, two and five close. The mixed gas in the pressure adsorption tank is forced into the heating catalytic equipment through the return pipe under residual pressure, and after passing through the catalyst packing layer for secondary thermal catalytic degradation, it is discharged through the discharge port.

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

[0032] After Phase II is completed, valves 1, 2 and 5 are opened, and valves 3 and 4 are closed. Nitrogen gas is drawn into the pressurization equipment to purge the catalyst packing layer and by-product adsorption layer, thereby activating and regenerating them.

[0033] Compared with the prior art, the beneficial effects of this invention are as follows:

[0034] To address the issue of residual sulfur hexafluoride (SF6) gas after recovery from high-voltage insulation equipment, and the continued illegal direct emission of maintenance exhaust gas from small gas insulation equipment in remote areas, this invention provides a vehicle-mounted SF6 degradation device and method. This method can solve the SF6 emission problem of small facilities on-site. Furthermore, by repeatedly contacting the catalyst with the SF6 for thermocatalytic degradation, the degradation efficiency is improved, resulting in a lower concentration of residual SF6 in the exhaust gas. Additionally, by adding an adsorption process using activated carbon, the content of sulfur-oxygen-fluorine byproducts such as SO2F2 and SOF2 in the exhaust gas can be effectively reduced. Simultaneously, the activation and regeneration of the catalyst and byproduct adsorption materials such as activated carbon are also considered. After adsorption enrichment and desorption, the sulfur-oxygen-fluorine byproducts such as SO2F2 and SOF2 can be centrally treated. Attached Figure Description

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

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

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

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

[0039] Figure 5 This is a cross-sectional schematic diagram of the catalyst layer in the heating catalytic device of a sulfur hexafluoride degradation apparatus according to the present invention. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0041] The terms "connection" and "installation" in this invention should be interpreted broadly, and can refer to fixed connections, detachable connections, rigid connections, or flexible connections. Those skilled in the art can understand the meaning of the above terms in this invention according to the specific circumstances.

[0042] The following disclosure provides different embodiments or examples to implement different structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Furthermore, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize 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 collection and pressurization device 2, a one-way valve 7, a second valve 37, a heating and catalytic device 5, a mixed gas delivery pipe 19, and a pressure adsorption storage tank 6, all sequentially connected on the loading vehicle 24. The one-way valve 7 ensures that the gas flow direction is from the collection and pressurization device 2 to the second valve 37, preventing backflow. The mixed gas delivery pipe 19 is equipped with a first valve 15, with both ends of the first valve 15 connected to the heating and catalytic device 5 and the pressure adsorption storage tank 6 respectively through the mixed gas delivery pipe 19.

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

[0045] The heating catalytic device 5 is used at least for the catalytic degradation of sulfur hexafluoride under steam and air atmospheres. Heating wires 16 are arranged on the surface of the heating catalytic device 5 for heating it. A heat-insulating protective sleeve 23 is installed on the outer surface of the heating wires 16 for heat preservation and protection of 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 sequentially along the airflow direction; the rear section 28 has a discharge port 9 with a valve 18. The heating catalytic device 5 is fixedly mounted on a 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 front section 27, the catalyst packing layer 12, and the rear section 28 are connected by a threaded, detachable sealing connection. The front section 27 has 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 has a front external thread 20. The catalyst packing layer 12 includes a fixing sleeve 22 and catalyst packing 33; the fixing sleeve 22 supports the catalyst packing 33 and is separable from the catalyst packing 33; the fixing sleeve 22 has 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 end of the rear section 28 connected to the catalyst packing layer 12 is provided with a rear external thread 34. The catalyst packing 33 can be removed and replaced by unscrewing the threads.

[0046] The pressure adsorption tank 6 is fixedly mounted on the loading vehicle 24 via a fixed base 26. The pressure adsorption tank 6 is used at least to adsorb sulfur-oxygen-fluorine byproducts generated from the degradation of sulfur hexafluoride. The pressure adsorption tank 6 includes a first zone 44, a byproduct adsorption layer 39, and a second zone 45 arranged sequentially along the airflow direction. The byproduct adsorption layer 39 is an activated carbon layer. The second zone 45 is connected to the front section 27 via a return pipe 42. A valve 38 is installed on the return pipe 42. A regeneration discharge pipe 43 with a valve 41 is connected to the return pipe 42 between the second zone 45 and the valve 38. The pressure adsorption tank 6 is equipped with a pressure gauge A14, which is located in the second zone 45. The pressure gauge A14 displays the pressure of the mixed gas inside the pressure adsorption tank 6, guiding the operation of the collection pressurization equipment 2 and each valve. A drain outlet 36 is opened at the bottom of the pressure adsorption tank 6, and a pressure relief valve 32 is installed at the top. The drain outlet 36 can be manually opened periodically for drainage. The pressure relief valve 32 is used to protect the pressure adsorption tank 6 and prevent excessive pressure.

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

[0048] Each valve involved in the aforementioned sulfur hexafluoride degradation device can be an independently electrically controlled pressure valve.

[0049] In the above-mentioned sulfur hexafluoride degradation device, the catalyst packing 33 in the catalyst packing layer 12 can be a thermocatalytic degradation catalyst.

[0050] Using the above-mentioned methods Figures 1 to 5 The sulfur hexafluoride degradation device shown is used for a sulfur hexafluoride degradation method. The sulfur hexafluoride degradation method includes:

[0051] Stage I: Valves 15 and 27 are opened, while valves 38, 48, and 51 are closed. The collecting and pressurizing device 2 draws in sulfur hexafluoride, water vapor, and air, which are then pressurized and transported to the heating and catalytic device 5. The heating wire 16 operates to continuously heat and maintain the temperature of the heating and catalytic device 5. The mixed gas containing sulfur hexafluoride, water vapor, and air passes through the catalyst packing layer 12 for the thermocatalytic degradation of sulfur hexafluoride. The degradation products are cooled by the cooling device 40 and then enter the pressure adsorption storage tank 6. The byproduct adsorption layer 39 adsorbs and removes sulfur, oxygen, and fluorine byproducts such as SO2F2 and SOF2 generated during the degradation of sulfur hexafluoride.

[0052] Phase II: After a period of time in Phase I or after pressure gauge A14 reaches the set value, the collection and pressurization equipment 2 stops operating, valves 38 and 418 open, valves 15, 27 and 51 close, heating wire 16 operates, continuously heating and maintaining the temperature of the heating catalytic equipment 5, and the mixed gas in the pressure adsorption storage tank 6 is forced into the heating catalytic equipment 5 through the return 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] Phase III: After Phase II, valves 1-15, 37-2, and 41-5 are opened, while valves 3-38 and 4-4-18 are closed. Heating wire 16 operates to continuously heat and maintain the temperature of the catalytic heating device 5, for example, at 600–800°C. Nitrogen gas is drawn into the pressurization device 2 to purge the catalyst packing layer 12 and the byproduct adsorption layer 39, thereby activating and regenerating them. During Phase III, the cooling device 40 may not be operational.

[0054] Furthermore, it should be understood that after reading the above description of the present invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A sulfur hexafluoride degradation apparatus, characterized by, The device comprises a collecting and pressurizing device (2), a valve (37), a heating and catalyzing device (5), a valve (15) and a pressure adsorption storage tank (6) connected in sequence. The collecting and pressurizing device (2) is used for collecting and delivering the mixture of sulfur hexafluoride, water vapor and air to the heating and catalyzing device (5). The heating and catalyzing device (5) is used for heating and catalyzing the degradation of sulfur hexafluoride in the atmosphere of water vapor and air. The heating and catalyzing device (5) comprises a front section (27), a catalyst filling layer (12) and a rear section (28) arranged in sequence along the direction of air flow. The rear section (28) is provided with a discharge port (9) with a valve (18). The heating and catalyzing device (5) is provided with heating wires (16) on the surface for heating. The outer surface of the heating wires (16) is provided with a heat preservation sleeve (23) for heat preservation and protection of the heating and catalyzing device (5). The front section (27), the catalyst filling layer (12) and the rear section (28) are connected by screw threads. The front section (27) is provided with a front pressure gauge (8), a front maintenance opening (10) and a front observation hole (17). The end of the front section (27) connected with the catalyst filling layer (12) is provided with a front outer thread (20). The catalyst filling layer (12) comprises a fixing sleeve (22) and a catalyst filling (33). The fixing sleeve (22) is used for supporting the catalyst filling (33) and can be separated from the catalyst filling (33). The two ends of the fixing sleeve (22) are provided with a front inner thread (21) and a rear inner thread (35), respectively. The rear section (28) is provided with a rear pressure gauge (13), a rear maintenance opening (29) and a rear observation hole (31). The end of the rear section (28) connected with the catalyst filling layer (12) is provided with a rear outer thread (34). The pressure adsorption storage tank (6) is used for adsorbing the by-product of sulfur, oxygen and fluorine generated by the degradation of sulfur hexafluoride. The pressure adsorption storage tank (6) comprises a first zone (44), a by-product adsorption layer (39) and a second zone (45) arranged in sequence along the direction of air flow. The second zone (45) is connected with the front section (27) through a reflux pipe (42). The reflux pipe (42) is provided with a valve (38). The reflux pipe (42) between the second zone (45) and the valve (38) is connected with a regeneration discharge pipe (43) with a valve (41). The device further comprises a loading vehicle (24). The collecting and pressurizing device (2), the heating and catalyzing device (5) and the pressure adsorption storage tank (6) are arranged on the loading vehicle (24). The collecting and pressurizing device (2) is fixedly installed on the loading vehicle (24) through a fixing base (25). The heating and catalyzing device (5) is fixedly installed on the loading vehicle (24) through a front fixing base (11) corresponding to the front section (27) and a rear fixing base (30) corresponding to the rear section (28). The pressure adsorption storage tank (6) is fixedly installed on the loading vehicle (24) through a fixing base (26).

2. The sulfur hexafluoride degradation apparatus of claim 1, wherein, The sulfur hexafluoride degradation device further comprises a one-way valve (7), two ends of the one-way valve (7) are connected with the collection and pressurization device (2) and the valve two (37) respectively, and the one-way valve (7) is used for ensuring that the gas flow direction is from the collection and pressurization device (2) to the valve two (37) and preventing backflow.

3. The sulfur hexafluoride degradation apparatus of claim 1, wherein, A cooling device (40) is arranged between the valve one (15) and the pressure adsorption storage tank (6), and the cooling device (40) is used for cooling the sulfur hexafluoride degradation product from the heating and catalysis device (5) to a temperature suitable for adsorption or desorption of the by-product adsorption layer (39).

4. The sulfur hexafluoride degradation apparatus of claim 1, wherein, 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 area (45). The pressure adsorption storage tank (6) is provided with a drain port (36) at the bottom and a pressure release valve (32) at the top.

5. The sulfur hexafluoride degradation apparatus of claim 1, wherein, The by-product adsorption layer (39) is an activated carbon layer.

6. The sulfur hexafluoride degradation device according to any one of claims 1-5 is used for degrading sulfur hexafluoride.

7. A method of degradation of sulfur hexafluoride, characterized by, The sulfur hexafluoride degradation device according to any one of claims 1-5 is used; The sulfur hexafluoride degradation method comprises: Stage I: the valve one (15) and the valve two (37) are opened, the valve three (38), the valve four (18) and the valve five (41) are closed, the collection and pressurization device (2) inhales sulfur hexafluoride, water vapor and air, and then the sulfur hexafluoride, the water vapor and the air are pressurized and delivered to the heating and catalysis device (5), the mixed gas containing the sulfur hexafluoride, the water vapor and the air passes through the catalyst filler layer (12) to perform thermal catalytic degradation of the sulfur hexafluoride, and the degradation product enters the pressure adsorption storage tank (6) to remove the sulfur oxyfluoride by-product generated by the sulfur hexafluoride degradation through the by-product adsorption layer (39); Stage II: after a period of time in stage I, the collection and pressurization device (2) stops running, the valve three (38) and the valve four (18) are opened, the valve one (15), the valve two (37) and the valve five (41) are closed, and the mixed gas in the pressure adsorption storage tank (6) is pressurized into the heating and catalysis device (5) through the reflux pipe (42) under residual pressure, and then the mixed gas passes through the catalyst filler layer (12) to perform secondary thermal catalytic degradation and is discharged through the discharge port (9).

8. The sulfur hexafluoride degradation method of claim 7, wherein, The sulfur hexafluoride degradation method further comprises stage III: After stage II is completed, the valve one (15), the valve two (37) and the valve five (41) are opened, the valve three (38) and the valve four (18) are closed, the collection and pressurization device (2) inhales nitrogen, the catalyst filler layer (12) and the by-product adsorption layer (39) are purged, and the catalyst filler layer (12) and the by-product adsorption layer (39) are activated and regenerated.

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