SF6 / N2 mixed gas separation and recovery simulation system and method

Abstract

The invention relates to an SF6 / N2 mixed gas separation and recovery simulation system and method, and the system comprises an environment simulation assembly, a gas distribution and supplement device, a mixed gas buffer assembly, a subzero treatment filling device, a separation and recovery device and a control system. The control system is electrically connected with the environment simulation assembly, the gas distributing and supplementing device, the mixed gas temporary storage assembly, the subzero treatment filling device and the separation and recovery device. The environment simulation assembly is used for reducing the SF6 / N2 mixed gas field recovery environment temperature; the gas distributing and supplementing device is used for preparing mixed gas from pure SF6 and N2 according to a proportion required by an experiment; the mixed gas caching assembly is used for storing mixed gas configured by the gas matching and supplementing device and providing test source gas for the separation and recovery device; the subzero treatment filling device and the separation and recovery device are used for treating SF6 / N2 mixed gas, and the separation and recovery device is arranged in an environment simulation assembly environment bin. According to the invention, SF6 / N2 mixed gas separation and recovery in a real environment can be simulated, and theoretical basis and experimental data support are provided for multi-technology collaborative mixed gas recovery and separation.

Description

Technical Field

[0001] The present invention relates to the technical field of gas recovery in transformer substations, and in particular to a SF6 / N2 mixed gas separation and recovery simulation system and method. Background Art

[0002] Sulfur hexafluoride (SF6) gas is widely used in the power industry due to its excellent insulation and arc extinguishing properties. However, sulfur hexafluoride has a significant greenhouse effect and is one of the six greenhouse gases that are prohibited from being emitted, so it needs to be strictly controlled during use. In order to adapt to new international environmental protection requirements and reduce greenhouse gas emissions, domestic and foreign power grid companies have begun to use SF6 / N2 mixed gas to replace pure sulfur hexafluoride insulation gas to reduce the use of sulfur hexafluoride gas.

[0003] At present, for the recovery of SF6 / N2 mixed gas, membrane separation technology is often used to extract N2 from sulfur hexafluoride mixed insulating gas. After treatment, the residual SF6 is discharged after meeting environmental protection requirements. After separation, the SF6 is recovered to cylinders or tanks for storage, and then deeply purified and recycled. However, the separation performance of polymer membrane groups has strict requirements on the membrane inlet pressure, temperature and gas cleanliness. In complex on-site working environments and with the increase in the operating years of the membrane group, the quality of the separated gas often fluctuates greatly and cannot meet the environmental emission requirements. The process parameters need to be adjusted repeatedly manually and the technical level of the personnel is extremely high, which seriously affects the progress of the recovery operation. At the same time, due to global climate change in recent years, my country's extremes of high temperatures in summer and severe cold in winter are significant, with long duration, wide range, high intensity and strong extremes, which have put forward new requirements and severe challenges for the front-line personnel of on-site production operations.

[0004] Therefore, it is very urgent to develop a method that can simulate various environments of on-site recovery of SF6 / N2 mixed gas, carry out research on SF6 / N2 mixed gas membrane separation fusion recovery and purification process optimization and control strategy, and test and evaluate the performance of corresponding devices, so as to provide theoretical basis and experimental data support for the recovery and separation of mixed gas with multi-technology collaboration. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to simulate various environments for on-site recovery of SF6 / N2 mixed gas, so as to carry out research on the optimization and control strategy of the membrane separation, fusion, recovery and purification process of SF6 / N2 mixed gas.

[0006] The present invention solves the above technical problems through the following technical means: an SF6 / N2 mixed gas separation and recovery simulation system, comprising an environmental simulation component (1), a gas supply device (2), a mixed gas buffer component (3), a cryogenic treatment filling device (4), a separation and recovery device (5) and a control system, wherein the control system is electrically connected to the environmental simulation component (1), the gas supply device (2), the mixed gas buffer component (3), the cryogenic treatment filling device (4), and the separation and recovery device (5); the environmental simulation component (1) is used to restore the environmental temperature of the SF6 / N2 mixed gas on-site recovery; the gas supply device (2) is used to prepare a mixed gas with pure SF6 and N2 according to the required proportion of the experiment; the mixed gas buffer component (3) is used to store the mixed gas prepared by the gas supply device (2) and provide a test source gas for the separation and recovery device (5); the cryogenic treatment filling device (4) and the separation and recovery device (5) are used to process the SF6 / N2 mixed gas, and the separation and recovery device (5) is arranged in the environmental chamber of the environmental simulation component (1).

[0007] As an optimized technical solution, the environmental simulation component (1) includes a temperature control unit (12), a heat exchange evaporator (13), an environmental chamber and an environmental simulation controller, wherein the temperature control unit (12) provides a cold and hot source for the heat exchange evaporator (13); the heat exchange evaporator (13) is arranged in the environmental chamber; and the environmental simulation controller is electrically connected to the temperature control unit (12) and the heat exchange evaporator (13), and is communicatively connected to the control system.

[0008] As an optimized technical solution, the mixed gas buffer component (3) comprises a mixed gas storage tank (31) and a wheeled base (32), the mixed gas storage tank 31 being placed on the wheeled base (32), a manual ball valve V1 being arranged between the mixed gas storage tank (31) and the gas supply device (2), a manual ball valve V2 being arranged between the mixed gas storage tank (31) and the separation and recovery device (5), a pressure sensor P1, a mechanical pressure gauge PG1, and a safety valve SV1 being arranged on the mixed gas storage tank (31), the pressure sensor P1 being electrically connected to a control system, a self-sealing joint J2 being arranged at the other end of the manual ball valve V1, a self-sealing joint J3 being arranged at the other end of the manual ball valve V2, and a self-sealing joint J1 being arranged at the output end of the gas supply device (2).

[0009] As an optimized technical solution, the separation and recovery device (5) comprises a vacuum pipeline system and a separation and recovery pipeline system.

[0010] As an optimized technical solution, the vacuum pipeline system includes manual valves V3 and V4, a vacuum gauge, a solenoid valve DV1, and a vacuum pump M4 which are connected in series in sequence, and a self-sealing joint J4 is provided at the other end of the manual valve V3.

[0011] As an optimized technical solution, the connection relationship of the separation and recovery pipeline system is as follows: the manual valve V3 is connected to the electric ball valve MV1, the flow meter, and the filter (571) in sequence, wherein the pipeline in front of the electric ball valve MV1 is provided with a mechanical pressure gauge PG2 and a pressure sensor P2, and the filter (571) is divided into two routes, one of which passes through the electric ball valve MV, and the other passes through the electric ball valve MV2, the vacuum compressor M5, and the solenoid valve DV2 in sequence, the common end of the electric ball valve MV and the solenoid valve DV2 is connected to the buffer tank (58), and the common end of the electric ball valve MV and the solenoid valve DV2 is provided with a self-sealing joint J7, and the buffer tank (58) is provided with a safety valve SV2, a mechanical pressure gauge PG3, and a pressure sensor P2. The sensor P3 and the buffer tank (58) are connected in sequence to a precision filter (572), a compressor M1, and a one-way valve CV1. The other end of the one-way valve CV1 is provided with a mechanical pressure gauge PG4, a pressure sensor P4, and a temperature sensor T1. The other end of the one-way valve CV1 is provided with a self-sealing joint J9. The two ends of the heating component (55) are provided with self-sealing joints J10 and J11, respectively. The first-stage membrane component (541) is provided with self-sealing joints J12, J13, and J17, respectively. The second-stage membrane component (542) is provided with self-sealing joints J14, J15, and J24, respectively. The third-stage membrane component (543) is provided with self-sealing joints J20, J21, and J22, respectively. A three-channel self-sealing joint JK is arranged between the three-stage membrane assembly (543), and self-sealing joints J8 and J23 are arranged at both ends of a connecting line, respectively. The self-sealing joint J8 is opposite to the self-sealing joint J7, and the three joints of the three-channel self-sealing joint JK are opposite to the self-sealing joints J24, J22 and J23 respectively. A mechanical pressure gauge PG5, a pressure sensor P5 and a temperature sensor T2 are arranged on the second compressor M2, and self-sealing joints J18 and J19 are arranged on the second compressor M2. The self-sealing joint J19 is opposite to the self-sealing joint J17 of the first-stage membrane assembly (541), and the self-sealing joint J19 is opposite to the self-sealing joint J20 of the third-stage membrane assembly (543). The other path after the manual valve V3 is connected in sequence to the electric The ball valve MV4 and the electric ball valve MV5 are provided with a third compressor M3 on the pipeline between the electric ball valve MV4 and the electric ball valve MV5. The third compressor M3 is provided with a mechanical pressure gauge PG6, a pressure sensor P6, and a temperature sensor T3. The other end of the third compressor M3 is provided with a self-sealing joint J16. The pipeline between the electric ball valve MV4 and the electric ball valve MV5 is also provided with a manual valve V5. The other end of the manual valve V5 is provided with a self-sealing joint J6. The other end of the electric ball valve MV5 is respectively connected to the exhaust gas treatment monitoring component (56) and the manual valve V6. The other end of the manual valve V6 is provided with a self-sealing joint J26. The other end of the exhaust gas treatment monitoring component (56) is provided with a self-sealing joint J25.

[0012] As an optimized technical solution, the heating component (55) includes a self-sealing joint J10, a manual valve V8, an electric ball valve MV7, a buffer tank (551), a temperature sensor T4, a multi-channel heater (552), an electric ball valve MV6, a manual valve V7 and a self-sealing joint J11 which are connected in series in sequence. The metal surface layer of the multi-channel heater (552) is sprayed with graphene thermal radiation paint. The multi-channel heater (552) includes left and right side converging copper tubes (5521), heat exchange fins (5522) and a far-infrared heater (5523). The heat exchange fins (5522) are arranged between the left and right side converging copper tubes (5521), and the far-infrared heater (5523) is respectively arranged above and below the combination of the heat exchange fins (5522) and the converging copper tube (5521).

[0013] As an optimized technical solution, the exhaust gas treatment monitoring component (56) includes an adsorption tank (561), a base (562), a weighing sensor (563), and an SF6 detector (564), wherein the adsorption tank (561) is filled with SF6 adsorbent, a weighing sensor (563) is arranged between the bottom of the adsorption tank (561) and the base (562), the base (562) is provided with wheels, and an SF6 detector (564) is arranged at the top of the adsorption tank (561), and the inlet and outlet of the adsorption tank (561) are respectively arranged on two sides of the top, and are connected to the outside through manual ball valves V9 and V10 respectively.

[0014] As an optimized technical solution, the cryogenic treatment filling device (4) adopts a single-stage compression mixed working medium refrigeration method, and the cryogenic treatment filling device (4) is provided with self-sealing joints J5, J26, and J27.

[0015] As an optimized technical solution, the original states of the manual ball valves V1~10, the electric ball valves MV1~7, and the solenoid valves DV1~2 are all closed, and the self-sealing joints J1~28 are all closed when not connected to the high-pressure corrugated hose, and are open after being connected to the high-pressure corrugated hose; it can simulate the SF6 / N2 mixed gas separation and recovery test and the SF6 / N2 mixed gas separation and recovery key component performance test.

[0016] As an optimized technical solution, the SF6 / N2 mixed gas separation and recovery test includes:

[0017] ①Membrane separation recovery

[0018] Preparation: Connect the self-sealing joints J1-2, J3-4, J5-6, J7-8, J9-10, J11-12, J13-14, J15-16, J17-18, J19-20, J21 / J25, J22 / JK, J23 / JK, and J24 / JK through high-pressure corrugated hoses respectively, and connect the self-sealing joint J26 to the discharge port of the detection room through a high-pressure corrugated hose for further analysis;

[0019] Vacuum self-cleaning: Open the manual ball valves V1~3 and V5~10. The operator clicks the function button to select the vacuum function on the industrial computer display interface. After startup, the electric ball valves MV1~7, vacuum pump M4, and solenoid valve DV1 are turned on. At this time, the operator slowly opens the manual ball valve V4 to vacuum and self-clean the membrane separation recovery pipeline. During the process, the system compares the vacuum value collected by the vacuum gauge with the parameter setting value. When the vacuum value is less than the parameter value, the system starts timing. After the preset timing time, the system alarms. After confirmation, the electric ball valves MV1~7, solenoid valve DV1, and vacuum pump M4 are closed in turn, prompting the operator to close the manual ball valves V1~10. The vacuum self-cleaning ends and the membrane separation recovery test begins;

[0020] Membrane separation recovery test: The operator clicks the function button of membrane separation recovery test on the display interface of the industrial computer. After startup, the environmental simulation component (1) is turned on to simulate the working environment temperature, the air supply device (2) prepares the SF6 / N2 mixed gas, the cryogenic treatment filling device (4) precools, and the heating component (55) is preheated. The system compares the P1 pressure value of the mixed gas storage tank (31) collected by the pressure sensor P1 with the lower limit of the parameter setting value. When the P1 pressure value is greater than the lower limit of the parameter value, the system alarms. When the P1 pressure value is greater than the upper limit of the parameter value, the air supply device (2) is automatically closed. After confirmation, the compressor M3 and the pressure sensor M4 are turned on in sequence. The compressor M2, the compressor M1, the electric ball valve MV1, and the electric ball valve MV3 are used to separate and recycle the SF6 / N2 mixed gas into the cryogenic treatment filling device (4). The system records and stores the flow meter, the weighing sensor (563) of the tail gas treatment monitoring component (56), the SF6 monitor (564), the temperature of the temperature controller, the pressure sensors P1-6, and the data information temperature sensors T1-4 in real time. During the process, the liquid level value of the cryogenic treatment filling device (4) collected by the system is compared with the parameter setting value. When the liquid level value is greater than the parameter value, the system alarms and resets the above electrical components. The membrane separation recovery test is completed and the data is sorted.

[0021] ②Membrane separation fusion recovery

[0022] Preparation: Connect the self-sealing joints J1 / 4, J9 / 2, J3 / 5, J27 / 10, J11 / 20, J21 / 25, J7~8, and J23 / J22 through high-pressure corrugated hoses respectively, and connect J26 to the discharge port of the test chamber through a high-pressure corrugated hose for further analysis;

[0023] Vacuum self-cleaning: Open the manual ball valves V1~3 and V7~8. The operator clicks the function button to select the vacuum function on the industrial computer display interface. After startup, the electric ball valves MV1 / MV3 / MV6 / MV7, vacuum pump M4 and solenoid valve DV1 are turned on. At this time, the operator slowly opens the manual ball valve V4 to vacuum and self-clean the membrane separation fusion recovery pipeline. During the process, the vacuum value collected by the system is compared with the parameter setting value. When the vacuum value is less than the parameter value, the system starts timing. After the preset timing time, the system alarms. After confirmation, the electric ball valves MV1 / MV3 / MV6 / MV7, solenoid valve DV1 and vacuum pump M4 are closed in turn, prompting the operator to close the manual ball valves V1~3 and V7~8. The vacuum self-cleaning ends and the membrane separation fusion recovery test begins;

[0024] Membrane separation fusion recovery: The operator clicks the function button of membrane separation fusion recovery test on the display interface of the industrial computer. After startup, the environmental simulation component (1) is turned on to simulate the working environment temperature, the air supply device (2) is equipped to prepare the SF6 / N2 mixed gas, the cryogenic treatment filling device (4) is precooled, and the heating component (55) is preheated. The precooling temperature value of the cryogenic treatment filling device (4) collected by the system is compared with the parameter setting value. When the precooling temperature value is less than the parameter value, the system alarms. After confirmation, the compressor M1, the electric ball valve MV1, and the electric ball valve MV3 are opened in sequence to pump the mixed gas into the gas storage tank of the mixed gas buffer component (3). The P1 pressure value collected by the system is compared with the parameter setting value. When the P1 pressure value is greater than the parameter value, the system alarms and opens the manual valve V2. The pressurized mixed gas enters The liquid enters the cryogenic treatment filling device (4) for cooling and liquefaction collection. The pressure value of the cryogenic treatment filling device (4) collected by the system is compared with the parameter setting value. When the pressure value of the cryogenic treatment filling device (4) is greater than the parameter value, the system alarms and opens the exhaust valve of the cryogenic treatment filling device (4) to enter the heating component (55), the three-stage membrane component, and the tail gas treatment monitoring component (56) to separate and recover the tail gas membrane combined with the adsorbent. The system records and stores the flow meter, weighing instrument, SF6 monitor, temperature controller temperature, pressure sensors P1~4 and data information temperature sensor T1 / 4 in real time. During the process, the liquid level value of the cryogenic treatment filling device (4) collected by the system is compared with the parameter setting value. When the liquid level value is greater than the parameter value, the system alarms and resets the above-mentioned electrical components. The membrane separation fusion recovery test is completed and data is sorted.

[0025] As an optimized technical solution, the performance test of key components of SF6 / N2 mixed gas separation and recovery also includes:

[0026] Preparation: Connect the self-sealing joints J1-2, J3-4, J5-6, J7-8, J9-10, J11-12, J13-14, J15-16, J17-18, J19-20, J21 / J25, J22 / JK, J23 / JK, and J24 / JK through high-pressure corrugated hoses respectively, and connect J26 to the discharge port of the detection room through a high-pressure corrugated hose for further analysis;

[0027] ①Recycling speed test

[0028] Vacuum self-cleaning: Open the manual ball valves V1~3 and V5~10. The operator clicks the function button to select the vacuum function on the industrial computer display interface. After startup, the electric ball valves MV1~7, vacuum pump M4, and solenoid valve DV1 are turned on. At this time, the operator slowly opens the manual ball valve V4 to vacuum and self-clean the membrane separation recovery pipeline. During the process, the vacuum value collected by the system is compared with the parameter setting value. When the vacuum value is less than the parameter value, the system starts timing. After the preset timing time, the system alarms. After confirmation, the electric ball valves MV1~7, solenoid valve DV1, and vacuum pump M4 are closed in turn, prompting the operator to close the manual ball valves V1~10. The vacuum self-cleaning ends and the membrane separation recovery test begins;

[0029] Recovery speed test: the operator clicks the function button for selecting membrane separation recovery speed test on the display interface of the industrial computer. After startup, the environmental simulation component (1) is turned on to adjust the temperature of the environmental chamber to 20°C, the air supply device (2) is equipped to prepare the SF6 / N2 mixed gas, the cryogenic treatment filling device (4) is precooled, and the heating component (55) is preheated. When the P1 pressure value collected by the system = 0.8MPa, the system alarms. After confirmation, the compressor M3, the compressor M2, the compressor M1, the electric ball valve MV1, and the electric ball valve MV3 are turned on in sequence to separate and recover the SF6 / N2 mixed gas into the cryogenic treatment filling device (4). When the P2 pressure value reaches a predetermined value, the system opens the solenoid valve DV2, the vacuum compressor M5 and the electric ball valve MV2. When the P1 pressure value collected by the system reaches a predetermined value, the recovery time and the flow meter data are recorded to calculate the recovery speed.

[0030] ② Vacuuming speed test: Confirm that the manual ball valves V1~10 are in the closed state and the PG1 pressure is at the preset value. The operator clicks the function button for vacuuming speed test on the industrial computer display interface. After startup, the environmental simulation component (1) is turned on to adjust the temperature of the environmental chamber to the target temperature value. After the temperature of the environmental chamber reaches the target temperature value, the vacuum pump M4 and the solenoid valve DV1 are turned on and the operator opens the manual ball valves V2~4. Vacuuming is performed until the vacuum gauge displays a preset value. The vacuuming time and the vacuum gauge data are recorded and the vacuuming speed is calculated.

[0031] ③ Exhaust quality durability test: The operator clicks the function button for membrane separation recovery speed test on the industrial computer display interface. After startup, the environmental simulation component (1) is turned on to adjust the temperature of the environmental chamber to the target temperature, the air supply device (2) is equipped to prepare the SF6 / N2 mixed gas, the cryogenic treatment filling device (4) is precooled, and the heating component (55) is preheated. When the P1 pressure value collected by the system reaches a predetermined value, the system alarms. After confirmation, the compressor M3, the compressor M2, the compressor M1, the electric ball valve MV1, and the electric ball valve MV3 are turned on in sequence to separate and recover the SF6 / N2 mixed gas into the cryogenic treatment filling device (4). When the P2 pressure value reaches a predetermined value, the system opens the solenoid valve DV2, the vacuum compressor M5 and the electric ball valve MV2. When the residual SF6 content in the discharge port N2 is monitored by the SF6 monitor in real time and reaches a predetermined value, the weighing weight, the flow meter mass and the separation recovery time are recorded.

[0032] The present invention also provides a method for simulating an SF6 / N2 mixed gas separation and recovery simulation system described in any of the above schemes, wherein the original states of all manual ball valves, electric ball valves, and solenoid valves are closed, and all self-sealing joints are closed when not connected to a high-pressure corrugated hose, and are open after being connected to the high-pressure corrugated hose. The simulation method includes: SF6 / N2 mixed gas separation and recovery test and SF6 / N2 mixed gas separation and recovery key component performance test.

[0033] The advantages of the present invention are as follows: the present invention provides an SF6 / N2 mixed gas separation and recovery simulation system, which simulates the SF6 / N2 mixed gas separation and recovery under real environment, provides theoretical basis and experimental data support for mixed gas recovery and separation with multi-technology collaboration, enhances the environmental adaptability of existing recovery systems, makes up for the deficiencies in membrane separation performance testing and evaluation research, and provides an effective way to realize efficient and intelligent on-site SF6 / N2 mixed gas recovery operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 : is an overall structural diagram of the SF6 / N2 mixed gas separation and recovery simulation system according to an embodiment of the present invention;

[0035] Figure 2 yes Figure 1 Schematic diagram of the heating component in;

[0036] Figure 3 yes Figure 1 Schematic diagram of the exhaust gas treatment monitoring components in;

[0037] Figure 4 It is a schematic diagram of a control system of a SF6 / N2 mixed gas separation and recovery simulation system according to an embodiment of the present invention;

[0038] Figure 5 It is a circuit schematic diagram of a control system of a SF6 / N2 mixed gas separation and recovery simulation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] like Figure 1 As shown, the present invention provides a SF6 / N2 mixed gas separation and recovery simulation system, including an environmental simulation component 1, a gas supply device 2, a mixed gas buffer component 3, a cryogenic treatment filling device 4, a separation and recovery device 5 and a control system. The control system is electrically connected to the environmental simulation component 1, the gas supply device 2, the mixed gas buffer component 3, the cryogenic treatment filling device 4, and the separation and recovery device 5 and monitors their related working states; the environmental simulation component 1 is used to truly restore the environmental temperature of the SF6 / N2 mixed gas on-site recovery; the gas supply device 2 is used to mix pure SF6 and N2 according to the required proportion of the experiment; the mixed gas buffer component 3 is used to store the mixed gas after the gas supply device 2 is mixed, and provide the test source gas for the separation and recovery device 5; the cryogenic treatment filling device 4 and the separation and recovery device 5 are used to process the SF6 / N2 mixed gas, so as to carry out the research on the optimization and control strategy of the membrane separation, fusion, recovery and purification process of the SF6 / N2 mixed gas. The gas supply device, mixed gas buffer component, cryogenic treatment filling device, and separation and recovery device are sealed and connected through high-pressure corrugated hoses according to simulation needs, and the separation and recovery device 5 is arranged in the environmental bin of the environmental simulation component 1.

[0041] The environmental simulation component 1 includes a temperature control unit 12, a heat exchange evaporator 13, an environmental chamber (not shown) and an environmental simulation controller (not shown). The temperature control unit 12 provides a cold and heat source of -35 to 50°C for the heat exchange evaporator 13, and is welded and sealed with a copper tube of the heat exchange evaporator 13 for thermal insulation; the heat exchange evaporator 13 is a wind heat exchange type, arranged in the environmental chamber, and efficiently exchanges heat with the environmental chamber by heat conduction and heat convection; the environmental simulation controller is electrically connected to the temperature control unit 12 and the heat exchange evaporator 13, and is connected to the control system 485 for communication, and receives control system commands to execute corresponding instructions.

[0042] A self-sealing joint J1 is provided at the output end of the gas supply device 2.

[0043] The mixed gas buffer component 3 includes 1m 3Mixed gas storage tank 31 and wheeled base 32, the mixed gas storage tank 31 is placed on the wheeled base 32 for easy movement. A manual ball valve V1 is set between the mixed gas storage tank 31 and the gas supply device 2, and a manual ball valve V2 is set between the mixed gas storage tank 31 and the separation and recovery device 5. The mixed gas storage tank 31 is provided with a pressure sensor P1, a mechanical pressure gauge PG1, and a safety valve SV1. The pressure sensor P1 is electrically connected to the control system to feed back the tank pressure signal to the control system in real time. The other end of the manual ball valve V1 is a self-sealing joint J2, and the other end of the manual ball valve V2 is a self-sealing joint J3.

[0044] The cryogenic treatment filling device 4 adopts a single-stage compression mixed working medium refrigeration method, and the unloaded limit temperature during refrigeration is <-90°C, the loaded temperature is <-50°C, and the heating temperature is >25°C. The cryogenic treatment filling device 4 is provided with self-sealing joints J5, J26, and J27.

[0045] The separation and recovery device 5 includes compressors M1~M3, a vacuum pump M4, a vacuum compressor M5, first to third stage membrane components 541~543, a heating component 55, an exhaust gas treatment monitoring component 56, a filter 57, a buffer tank 58, various instruments (vacuum gauge, flow meter, weighing instrument, SF6 monitor, temperature sensor, pressure sensor, mechanical pressure gauge), valves (check valve, safety valve, manual valve, electric ball valve, solenoid valve), joints, pipeline components and a vacuum pipeline system and a separation and recovery pipeline system composed of the above devices.

[0046] The vacuum pipeline system includes manual valves V3 and V4, a vacuum gauge, a solenoid valve DV1, and a vacuum pump M4 which are connected in series in sequence. A self-sealing joint J4 is provided at the other end of the manual valve V3.

[0047] The separation and recovery pipeline system includes a manual valve V3, an electric ball valve MV1, a flow meter, a filter 571, an electric ball valve MV2, a vacuum compressor M5, a solenoid valve DV2, an electric ball valve MV3, a buffer tank 58, a precision filter 572, a compressor M1, a one-way valve CV1, a heating component 55, first to third stage membrane components 541 to 543, a second compressor M2, a third compressor M3, an electric ball valve MV4, an electric ball valve MV5, an exhaust gas treatment monitoring component 56, a manual valve V5, and a manual valve V6. The manual valve V3 is connected to the electric ball valve MV1, the flow meter, and the filter 571 in sequence. The pipeline in front of the electric ball valve MV1 is provided with a mechanical pressure gauge PG2 and a pressure sensor P2. The filter 571 is divided into two routes, one of which passes through the electric ball valve MV, and the other passes through the electric ball valve MV2, the vacuum compressor M5, and the solenoid valve DV2 in sequence. The common end of the electric ball valve MV and the solenoid valve DV2 is connected to the buffer tank 58, and the common end of the electric ball valve MV and the solenoid valve DV2 is provided with a self-sealing joint J7. The buffer tank 58 is provided with a safety valve SV2, a mechanical pressure gauge PG3, and a pressure sensor P3. The buffer tank 58 is connected to the precision filter 572, the compressor M1, and the one-way valve CV1 in sequence. The other end of the one-way valve CV1 is provided with a mechanical pressure gauge PG4, a pressure sensor P4, and a temperature sensor T1, and the other end of the one-way valve CV1 is provided with a self-sealing joint J9. Self-sealing joints J10 and J11 are provided at both ends of the heating component 55, respectively. The first-stage membrane assembly 541 is provided with self-sealing joints J12, J13, and J17, the second-stage membrane assembly 542 is provided with self-sealing joints J14, J15, and J24, and the third-stage membrane assembly 543 is provided with self-sealing joints J20, J21, and J22, wherein a three-channel self-sealing joint JK is provided between the second-stage membrane assembly 542 and the third-stage membrane assembly 543, and self-sealing joints J8 and J23 are provided at both ends of a connecting line, respectively, and the self-sealing joint J8 is opposite to the self-sealing joint J7, and the three joints of the three-channel self-sealing joint JK are opposite to the self-sealing joints J24, J22, and J23, respectively. The second compressor M2 is provided with a mechanical pressure gauge PG5, a pressure sensor P5, and a temperature sensor T2, and the second compressor M2 is provided with self-sealing joints J18 and J19, and the self-sealing joint J19 is opposite to the self-sealing joint J17 of the first-stage membrane assembly 541, and the self-sealing joint J19 is opposite to the self-sealing joint J20 of the third-stage membrane assembly 543.The other route after the manual valve V3 is connected to the electric ball valve MV4 and the electric ball valve MV5 in sequence. A third compressor M3 is arranged on the pipeline between the electric ball valve MV4 and the electric ball valve MV5. A mechanical pressure gauge PG6, a pressure sensor P6, and a temperature sensor T3 are arranged on the third compressor M3. A self-sealing joint J16 is arranged at the other end of the third compressor M3. A manual valve V5 is also arranged on the pipeline between the electric ball valve MV4 and the electric ball valve MV5. A self-sealing joint J6 is arranged at the other end of the manual valve V5. The other end of the electric ball valve MV5 is respectively connected to the exhaust gas treatment monitoring component 56 and the manual valve V6. A self-sealing joint J26 is arranged at the other end of the manual valve V6. A self-sealing joint J25 is arranged at the other end of the exhaust gas treatment monitoring component 56.

[0048] See also Figure 2 , the heating component 55 includes a self-sealing joint J10, a manual valve V8, an electric ball valve MV7, a temperature sensor T4, a multi-channel heater 551, a buffer tank 552, an electric ball valve MV6, a manual valve V7 and a self-sealing joint J11 connected in series in sequence. The heating component 55 adopts a shunt method far-infrared heating method, and the metal surface layer of the multi-channel heater 551 is sprayed with graphene thermal radiation paint to improve the infrared thermal radiation effect, so as to achieve non-contact and efficient heat exchange with the SF6 / N2 mixed gas to improve the heating efficiency. The multi-channel heater 551 includes left and right side converging copper tubes 5521, heat exchange fins 5522 and far-infrared heaters 5523. The heat exchange fins 5522 are arranged between the left and right side converging copper tubes 5521, and the far-infrared heaters 5523 are respectively arranged above and below the combination of the heat exchange fins 5522 and the converging copper tubes 5521.

[0049] The thermal radiation coefficient of metal is generally low, so the thermal radiation effect of the metal surface in the whole heat exchange process can be ignored, but if a layer of graphene thermal radiation coating is sprayed on the metal surface, its thermal radiation effect will have a qualitative leap. Experiments have shown that under the same power, the heating plate sprayed with graphene thermal radiation coating heats up faster than ordinary heating plates. In the experiment with an initial temperature of 17.7 degrees Celsius, the heater with graphene spraying runs at 2000W for 120 minutes, and the ambient temperature rises by 10.2 degrees Celsius. The heater without graphene spraying runs at 2000W for 120 minutes, and the ambient temperature only rises by 5.5 degrees Celsius.

[0050] See also Figure 3The exhaust gas treatment monitoring component 56 includes an adsorption tank 561, a base 562, a weighing sensor 563, and an SF6 detector 564. The adsorption tank 561 is filled with SF6 adsorbent, and a weighing sensor 563 is arranged between the bottom of the adsorption tank 561 and the base 562. The base 562 has wheels for easy movement at any time. The SF6 detector 564 is arranged on the top of the adsorption tank 561. The inlet and outlet of the adsorption tank 561 are respectively arranged on two sides of the top, and are connected to the outside through manual ball valves V9 and V10 respectively.

[0051] Figure 1 , 2 In the above SF6 / N2 mixed gas separation and recovery simulation system, connectors J1~28 are self-sealing connectors, connector JK is a three-channel self-sealing connector, DV1 and DV2 are solenoid valves, V1~10 are manual ball valves, MV1~7 are electric ball valves, PG1~6 are mechanical pointer pressure gauges, P1~6 are 4-20ma output pressure sensors, P1~6 pressure sensors have a range of -0.1MPa~4MPa, T1~T4 are platinum resistance PT100 temperature sensors, SV1~2 are safety valves, F1 is a mass flow meter, and CV1 is a one-way valve.

[0052] See also Figures 4 to 5The control system includes an industrial computer, a display, a keyboard and a control component. The industrial computer is connected to the controller of the gas supply device 2, the controller of the deep cold treatment filling device 4, the weighing instrument, the SF6 monitor, the temperature controller, the vacuum meter, the flow meter and the environmental simulation controller via RS485 communication. The control component includes a circuit breaker QF connected to an AC380V power supply through a three-phase five-wire five-core cable, a circuit breaker QF1 / contactor KM1 combination for disconnecting and protecting the main power supply of compressor M1, a circuit breaker QF2 / contactor KM2 combination for disconnecting and protecting the main power supply of compressor M2, a circuit breaker QF3 / contactor KM3 combination for disconnecting and protecting the main power supply of compressor M3, a circuit breaker QF4 / contactor KM4 combination for disconnecting and protecting the main power supply of vacuum pump M4, a circuit breaker QF5 / contactor KM5 combination for disconnecting and protecting the main power supply of vacuum compressor M5, a circuit breaker QF6 / contactor KM6 / solid-state relay SSR combination for disconnecting and protecting the main power supply of far-infrared heater 5523, a phase sequence protector K00 for the correct operating power supply phase sequence of compressors M1-3, vacuum pump M4, and vacuum compressor M5, a circuit breaker QF7, an isolation transformer, and a filter for protecting the control circuit and anti-interference processing before data acquisition, and a PLC main The machine, temperature module, and current module are used to control the compressor M1~3, vacuum pump M4, vacuum compressor M5, temperature rise, solenoid valve DV1~2, electric ball valve MV1~7, and sound and light alarm start and stop, and collect and analyze temperature T1~4 and pressure sensor P1~6, and collect data in real time and accurately during the working state. The button switches SB1, SB2, phase sequence protector K00, and intermediate relay KA1 control the opening and closing of the main power supply of the device, and provide AC220V power supply for the switching power supply DV, weighing instrument, SF6 monitor, temperature controller, vacuum meter, flow meter, PLC, industrial computer, display and switching power supply DY. The 24VDC output end of the switching power supply DY provides DC24V power supply for the power indicator HL1, phase sequence protection indicator HL2, solid-state relay SSR analog control input port, temperature module, current module and pressure sensor P1~6. The output end of the PLC host is divided into 16 channels Q0.0~1.7, 16 outputs are connected to 16 intermediate relays KA2~KA6, KA0, KA7~KA16 respectively. Intermediate relay KA2 controls the on / off of compressor M1, intermediate relay KA3 controls the on / off of compressor M2, intermediate relay KA4 controls the on / off of compressor M3, intermediate relay KA5 controls the on / off of vacuum pump M4, intermediate relay KA6 controls the on / off of vacuum compressor M5, intermediate relay KA0 controls the on / off of heating component 55, intermediate relay KA7 controls the on / off of solenoid valve DV1, intermediate relay KA8 controls the start / stop of solenoid valve DV2, intermediate relay KA9 controls the on / off of solenoid valve DV1. The start and stop of the electric ball valve MV1, the intermediate relay KA10 controls the opening and closing of the electric ball valve MV2, the intermediate relay KA11 controls the opening and closing of the electric ball valve MV3, the intermediate relay KA12 controls the opening and closing of the electric ball valve MV4, the intermediate relay KA13 controls the opening and closing of the electric ball valve MV5, the intermediate relay KA14 controls the opening and closing of the electric ball valve MV6, the intermediate relay KA15 controls the opening and closing of the electric ball valve MV7, and the intermediate relay KA16 controls the start and stop of the sound and light alarm. At the same time, the industrial computer is connected with a keyboard and a display, which are used for human-computer interaction, setting and displaying the key parameters of the device operation status. The communication address of the controller of the gas supply device 2 is set to 01, the communication address of the PLC host is set to 02, the communication address of the controller of the deep cold treatment filling device 4 is set to 03, the communication address of the weighing instrument and SF6 monitor is set to 04, the communication address of the temperature controller, vacuum gauge, and flow meter is set to 05, and the communication address of the environmental simulation controller is set to 06, so as to achieve neat wiring and convenient data collection and analysis. .

[0053] The working principle of the SF6 / N2 mixed gas separation and recovery simulation system is described as follows.

[0054] The original states of the manual ball valves V1~10, the electric ball valves MV1~7, and the solenoid valves DV1~2 are all closed. The self-sealing joints J1~28 are all closed when they are not connected to the high-pressure corrugated hose, and are open after they are connected to the high-pressure corrugated hose.

[0055] 1. SF6 / N2 mixed gas separation and recovery test

[0056] ①Membrane separation recovery

[0057] Preparation: Connect the self-sealing joints J1-2, J3-4, J5-6, J7-8, J9-10, J11-12, J13-14, J15-16, J17-18, J19-20, J21 / J25, J22 / JK, J23 / JK and J24 / JK through high-pressure corrugated hoses respectively, and connect the self-sealing joint J26 to the discharge port of the detection room through a high-pressure corrugated hose for further analysis.

[0058] Vacuum self-cleaning: Open the manual ball valves V1~3 and V5~10. The operator clicks the function button to select the vacuum function on the industrial computer display interface. After startup, the electric ball valves MV1~7, vacuum pump M4 and solenoid valve DV1 are turned on. At this time, the operator slowly opens the manual ball valve V4 to vacuum and self-clean the membrane separation recovery pipeline. During the process, the system compares the vacuum value collected by the vacuum gauge 59 with the parameter setting value. When the vacuum value is less than the parameter value, the system starts timing. After 30 minutes of timing, the system alarms. After confirmation, the electric ball valves MV1~7, solenoid valve DV1 and vacuum pump M4 are closed in turn, prompting the operator to close the manual ball valves V1~10. The vacuum self-cleaning ends and the membrane separation recovery test begins.

[0059] Membrane separation recovery test: The operator clicks the function button of membrane separation recovery test on the display interface of the industrial computer. After startup, the environmental simulation component 1 is turned on to simulate the working environment temperature, the air supply device 2 prepares SF6 / N2 mixed gas, the cryogenic treatment filling device 4 precools, and the heating component 55 preheats. The system compares the P1 pressure value of the mixed gas storage tank 31 collected by the pressure sensor P1 with the lower limit of the parameter setting value. When the P1 pressure value is greater than the lower limit of the parameter value, the system alarms. When the P1 pressure value is greater than the upper limit of the parameter value, the air supply device 2 is automatically closed. After confirmation, the compressor M3 and the compressor M4 are turned on in sequence. Machine M2, compressor M1, electric ball valve MV1, electric ball valve MV3, separate and recycle the SF6 / N2 mixed gas into the cryogenic treatment filling device 4. The system records and stores the flow meter, the weighing sensor 563 of the tail gas treatment monitoring component 56, the SF6 monitor 564, the temperature controller temperature, the pressure sensor P1~6 and the data information temperature sensor T1~4 in real time. During the process, the liquid level value of the cryogenic treatment filling device 4 collected by the system is compared with the parameter setting value. When the liquid level value is greater than the parameter value, the system alarms and resets the above electrical components, and the membrane separation recovery test is completed, and data is sorted. This process tests the environmental adaptability, separation efficiency and other indicators of the membrane component by setting the values ​​of the environmental simulation component 1, the heating component 55 and the SF6 monitor 564. It can also quickly replace the first to third level membrane components 541~543 through the self-sealing joint for the molecular membrane in service to carry out regular performance testing, optimize the process parameters of the membrane separation system and improve the operation efficiency.

[0060] ②Membrane separation fusion recovery

[0061] Preparation: Connect the self-sealing joints J1 / 4, J9 / 2, J3 / 5, J27 / 10, J11 / 20, J21 / 25, J7~8, and J23 / J22 through high-pressure corrugated hoses respectively, and connect J26 to the discharge port of the detection room through a high-pressure corrugated hose for further analysis.

[0062] Vacuum self-cleaning: Open the manual ball valves V1~3, V7~8, and the operator clicks the function selection vacuum function button on the industrial computer display interface. After starting, open the electric ball valves MV1 / MV3 / MV6 / MV7, vacuum pump M4, and solenoid valve DV1. At this time, the operator slowly opens the manual ball valve V4 to vacuum and self-clean the membrane separation fusion recovery pipeline. During the process, the vacuum value collected by the system is compared with the parameter setting value. When the vacuum value is less than the parameter value, the system starts timing. After 30 minutes of timing, the system alarms. After confirmation, the electric ball valves MV1 / MV3 / MV6 / MV7, solenoid valve DV1, and vacuum pump M4 are closed in turn, prompting the operator to close the manual ball valves V1~3, V7~8. The vacuum self-cleaning ends and enters the membrane separation fusion recovery test.

[0063] Membrane separation fusion recovery: The operator clicks the function button of membrane separation fusion recovery test on the display interface of the industrial computer. After startup, the environmental simulation component 1 is turned on to simulate the operating environment temperature, the air supply device 2 is equipped to prepare the SF6 / N2 mixed gas, the cryogenic treatment filling device 4 is precooled, and the heating component 55 is preheated. The precooling temperature value of the cryogenic treatment filling device 4 collected by the system is compared with the parameter setting value. When the precooling temperature value is less than the parameter value, the system alarms. After confirmation, the compressor M1, the electric ball valve MV1, and the electric ball valve MV3 are opened in turn to pump the mixed gas into the gas tank of the mixed gas buffer component 3. The P1 pressure value collected by the system is compared with the parameter setting value. When the P1 pressure value is greater than the parameter value, the system alarms and opens the manual valve V2. The pressurized mixed gas Enter the cryogenic treatment filling device 4 to cool down and liquefy and collect. The pressure value of the cryogenic treatment filling device 4 collected by the system is compared with the parameter setting value. When the pressure value of the cryogenic treatment filling device 4 is greater than the parameter value, the system alarms and opens the exhaust valve of the cryogenic treatment filling device 4 to enter the heating component 55, the three-stage membrane component, and the tail gas treatment monitoring component 56 to separate and recover the tail gas membrane combined with the adsorbent. The system records and stores the flow meter, weighing instrument, SF6 monitor, temperature controller temperature, pressure sensors P1~4 and data information temperature sensor T1 / 4 in real time. During the process, the liquid level value of the cryogenic treatment filling device 4 collected by the system is compared with the parameter setting value. When the liquid level value is greater than the parameter value, the system alarms and resets the above electrical components. The membrane separation fusion recovery test is completed and data is sorted. This process tests the environmental adaptability, separation efficiency and other indicators of the membrane separation fusion recovery process by setting the parameters of the environmental simulation component 1, the heating component 55 value and the SF6 monitor, and optimizes the existing recovery system process parameters to improve the operation efficiency.

[0064] 2SF6 / N2 mixed gas separation and recovery key component performance test

[0065] Preparation: Connect the self-sealing joints J1-2, J3-4, J5-6, J7-8, J9-10, J11-12, J13-14, J15-16, J17-18, J19-20, J21 / J25, J22 / JK, J23 / JK, and J24 / JK through high-pressure corrugated hoses respectively, and connect J26 to the discharge port of the detection room through a high-pressure corrugated hose for further analysis.

[0066] ①Recycling speed test

[0067] Vacuum self-cleaning: Open the manual ball valves V1~3, V5~10, and the operator clicks the function selection vacuum function button on the industrial computer display interface. After starting, open the electric ball valves MV1~7, vacuum pump M4, and solenoid valve DV1. At this time, the operator slowly opens the manual ball valve V4 to vacuum and self-clean the membrane separation recovery pipeline. During the process, the vacuum value collected by the system is compared with the parameter setting value. When the vacuum value is less than the parameter value, the system starts timing. After 30 minutes of timing, the system alarms. After confirmation, close the electric ball valves MV1~7, solenoid valve DV1, and vacuum pump M4 in turn, prompting the operator to close the manual ball valves V1~10, and the vacuum self-cleaning ends, and enters the membrane separation recovery test.

[0068] Recovery speed test: The operator clicks the function button of membrane separation recovery speed test on the display interface of the industrial computer. After startup, the environmental simulation component 1 is turned on to adjust the temperature of the environmental chamber to 20°C, the air supply device 2 is equipped to prepare the SF6 / N2 mixed gas, the cryogenic treatment filling device 4 is precooled, and the heating component 55 is preheated. When the P1 pressure value collected by the system is 0.8MPa, the system alarms. After confirmation, the compressor M3, compressor M2, compressor M1, electric ball valve MV1, and electric ball valve MV3 are turned on in sequence to separate and recover the SF6 / N2 mixed gas into the cryogenic treatment filling device 4. When the P2 pressure value is less than 0.1MPa, the system opens the solenoid valve DV2, vacuum compressor M5 and electric ball valve MV2, and the P1 pressure value collected by the system reaches 5×10 -3 MPa, record the recovery time and flow meter data, calculate the recovery speed, which should meet 5m 3 / h、10m 3 / h、30m 3 / h. In this process, the environmental simulation component 1, the temperature rise component 55 value and the SF6 monitor can be set by parameters to test the environmental adaptability and separation efficiency of the membrane component. The first to third-level membrane components can be quickly replaced by self-sealing joints to carry out regular performance testing and evaluation and analysis for the molecular membrane after service, so as to optimize the process parameters of the membrane separation system and improve the operating efficiency.

[0069] ② Vacuuming speed test: Confirm that the manual ball valves V1~10 are closed and the PG1 pressure = 0.1MPa. The operator clicks the function button to select the vacuuming speed test function on the industrial computer display interface. After startup, turn on the environmental simulation component 1 to adjust the environmental chamber temperature to the target temperature value. After the environmental chamber temperature reaches the target temperature value, turn on the vacuum pump M4, solenoid valve DV1 and the personnel open the manual ball valves V2~4. Vacuum until the vacuum gauge display value is <133Pa, record the vacuuming time and vacuum gauge data, and calculate the vacuuming speed. It should meet 1m 3 / h、2m 3 / h、5m 3 / h.

[0070] ③ Tail gas quality durability test: The operator clicks the function button of membrane separation recovery speed test on the industrial computer display interface, and after startup, the environmental simulation component 1 is turned on to adjust the temperature of the environmental chamber to the target temperature, the air supply device 2 is equipped to prepare the SF6 / N2 mixed gas, the cryogenic treatment filling device 4 is precooled, and the heating component 55 is preheated. When the P1 pressure value collected by the system = 0.8MPa, the system alarms. After confirmation, the compressor M3, the compressor M2, the compressor M1, the electric ball valve MV1, and the electric ball valve MV3 are turned on in sequence to separate and recover the SF6 / N2 mixed gas into the cryogenic treatment filling device 4. When the P2 pressure value is <0.1MPa, the system opens the solenoid valve DV2, the vacuum compressor M5 and the electric ball valve MV2. When the SF6 monitor monitors the residual SF6 content in the discharge port N2 in real time ≥0.05%, the weighing instrument weight, the flow meter mass and the separation and recovery time are recorded, and the optimal treatment parameters of the tail gas treatment monitoring component 56 are evaluated to provide a theoretical basis for timely replacement of the adsorbent.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A SF6 / N2 mixed gas separation and recovery simulation system, characterized by: The invention comprises an environmental simulation component (1), a gas supply device (2), a mixed gas buffer component (3), a cryogenic treatment filling device (4), a separation and recovery device (5) and a control system, wherein the control system is electrically connected to the environmental simulation component (1), the gas supply device (2), the mixed gas buffer component (3), the cryogenic treatment filling device (4) and the separation and recovery device (5); the environmental simulation component (1) is used to restore the environmental temperature of the SF6 / N2 mixed gas on-site recovery; the gas supply device (2) is used to prepare a mixed gas of pure SF6 and N2 according to the required proportion of the experiment; the mixed gas buffer component (3) is used to store the mixed gas prepared by the gas supply device (2) and provide a test source gas for the separation and recovery device (5); the cryogenic treatment filling device (4) and the separation and recovery device (5) are used to process the SF6 / N2 mixed gas, and the separation and recovery device (5) is arranged in the environmental chamber of the environmental simulation component (1).

2. A SF6 / N2 mixed gas separation and recovery simulation system as claimed in claim 1, characterized in that: The mixed gas buffer assembly (3) comprises a mixed gas storage tank (31) and a wheeled base (32), the mixed gas storage tank 31 being placed on the wheeled base (32), a manual ball valve V1 being arranged between the mixed gas storage tank (31) and the gas supply device (2), a manual ball valve V2 being arranged between the mixed gas storage tank (31) and the separation and recovery device (5), a pressure sensor P1, a mechanical pressure gauge PG1, and a safety valve SV1 being arranged on the mixed gas storage tank (31), the pressure sensor P1 being electrically connected to a control system, a self-sealing joint J2 being arranged at the other end of the manual ball valve V1, a self-sealing joint J3 being arranged at the other end of the manual ball valve V2, and a self-sealing joint J1 being arranged at the output end of the gas supply device (2).

3. A SF6 / N2 mixed gas separation and recovery simulation system as claimed in claim 2, characterized in that: The separation and recovery device (5) comprises a vacuum pipeline system and a separation and recovery pipeline system; The vacuum pipeline system includes manual valves V3, V4, a vacuum gauge, a solenoid valve DV1, and a vacuum pump M4 connected in series in sequence, and a self-sealing joint J4 is provided at the other end of the manual valve V3; The connection relationship of the separation and recovery pipeline system is as follows: the manual valve V3 is connected to the electric ball valve MV1, the flow meter, and the filter (571) in sequence, wherein the pipeline in front of the electric ball valve MV1 is provided with a mechanical pressure gauge PG2 and a pressure sensor P2, and the filter (571) is divided into two routes, one of which passes through the electric ball valve MV, and the other passes through the electric ball valve MV2, the vacuum compressor M5, and the solenoid valve DV2 in sequence, the common end of the electric ball valve MV and the solenoid valve DV2 is connected to the buffer tank (58), and the common end of the electric ball valve MV and the solenoid valve DV2 is provided with a self-sealing joint J7, the buffer tank (58) is provided with a safety valve SV2, a mechanical pressure gauge PG3, and a pressure sensor P3, and the buffer tank (58) is provided with a safety valve SV2, a mechanical pressure gauge PG3, and a pressure sensor P3. After the tank (58) is flushed, it is connected in sequence to a precision filter (572), a compressor M1, and a one-way valve CV1. The other end of the one-way valve CV1 is provided with a mechanical pressure gauge PG4, a pressure sensor P4, and a temperature sensor T1. The other end of the one-way valve CV1 is provided with a self-sealing joint J9. Self-sealing joints J10 and J11 are provided at both ends of the heating component (55). Self-sealing joints J12, J13, and J17 are provided on the first-level membrane component (541). Self-sealing joints J14, J15, and J24 are provided on the second-level membrane component (542). Self-sealing joints J20, J21, and J22 are provided on the third-level membrane component (543). A three-channel self-sealing joint JK is arranged between (543), and self-sealing joints J8 and J23 are arranged at both ends of a connecting line respectively. The self-sealing joint J8 is opposite to the self-sealing joint J7. The three joints of the three-channel self-sealing joint JK are opposite to the self-sealing joints J24, J22 and J23 respectively. A mechanical pressure gauge PG5, a pressure sensor P5, and a temperature sensor T2 are arranged on the second compressor M2, and self-sealing joints J18 and J19 are arranged on the second compressor M2. The self-sealing joint J19 is opposite to the self-sealing joint J17 of the first-stage membrane assembly (541), and the self-sealing joint J19 is opposite to the self-sealing joint J20 of the third-stage membrane assembly (543). The other way after the manual valve V3 is connected in sequence to the electric ball valve MV4 and the electric ball valve MV5, a third compressor M3 is arranged on the pipeline between the electric ball valve MV4 and the electric ball valve MV5, a mechanical pressure gauge PG6, a pressure sensor P6, and a temperature sensor T3 are arranged on the third compressor M3, a self-sealing joint J16 is arranged at the other end of the third compressor M3, a manual valve V5 is also arranged on the pipeline between the electric ball valve MV4 and the electric ball valve MV5, a self-sealing joint J6 is arranged at the other end of the manual valve V5, the other end of the electric ball valve MV5 is respectively connected to the exhaust gas treatment monitoring component (56) and the manual valve V6, the other end of the manual valve V6 is arranged with a self-sealing joint J26, and the other end of the exhaust gas treatment monitoring component (56) is arranged with a self-sealing joint J25.

4. A SF6 / N2 mixed gas separation and recovery simulation system as claimed in claim 3, characterized in that: The heating component (55) comprises a self-sealing joint J10, a manual valve V8, an electric ball valve MV7, a buffer tank (551), a temperature sensor T4, a multi-channel heater (552), an electric ball valve MV6, a manual valve V7 and a self-sealing joint J11 which are sequentially connected in series. The metal surface layer of the multi-channel heater (552) is sprayed with graphene thermal radiation paint. The multi-channel heater (552) comprises left and right side converging copper tubes (5521), heat exchange fins (5522) and a far-infrared heater (5523). The heat exchange fins (5522) are arranged between the left and right side converging copper tubes (5521), and the far-infrared heater (5523) is respectively arranged above and below the combination of the heat exchange fins (5522) and the converging copper tube (5521).

5. A SF6 / N2 mixed gas separation and recovery simulation system as claimed in claim 3, characterized in that: The exhaust gas treatment monitoring component (56) comprises an adsorption tank (561), a base (562), a weighing sensor (563), and an SF6 detector (564), wherein the adsorption tank (561) contains SF6 adsorbent, a weighing sensor (563) is arranged between the bottom of the adsorption tank (561) and the base (562), the base (562) is provided with wheels, and an SF6 detector (564) is arranged at the top of the adsorption tank (561), and the inlet and outlet of the adsorption tank (561) are respectively arranged on two sides of the top, and are connected to the outside through manual ball valves V9 and V10 respectively.

6. A SF6 / N2 mixed gas separation and recovery simulation system as claimed in claim 3, characterized in that: The cryogenic treatment filling device (4) adopts a single-stage compression mixed working medium refrigeration method, the no-load limit temperature during refrigeration is <-90°C, the loaded temperature is <-50°C, and the heating temperature is >25°C. The cryogenic treatment filling device (4) is provided with self-sealing joints J5, J26, and J27.

7. A SF6 / N2 mixed gas separation and recovery simulation system as claimed in claim 6, characterized in that: The manual ball valves V1-10, electric ball valves MV1-7, and solenoid valves DV1-2 are originally in a closed state; the self-sealing joints J1-28 are in a closed state when not connected to the high-pressure corrugated hose, and are in an open state after being connected to the high-pressure corrugated hose; they can simulate SF6 / N2 mixed gas separation and recovery tests and SF6 / N2 mixed gas separation and recovery key component performance tests.

8. A SF6 / N2 mixed gas separation and recovery simulation system as claimed in claim 7, characterized in that: The SF6 / N2 mixed gas separation and recovery test includes: ①Membrane separation recovery Preparation: Connect the self-sealing joints J1-2, J3-4, J5-6, J7-8, J9-10, J11-12, J13-14, J15-16, J17-18, J19-20, J21 / J25, J22 / JK, J23 / JK, and J24 / JK through high-pressure corrugated hoses respectively, and connect the self-sealing joint J26 to the discharge port of the detection room through a high-pressure corrugated hose for further analysis; Vacuum self-cleaning: Open the manual ball valves V1~3 and V5~10. The operator clicks the function button to select the vacuum function on the industrial computer display interface. After startup, the electric ball valves MV1~7, vacuum pump M4, and solenoid valve DV1 are turned on. At this time, the operator slowly opens the manual ball valve V4 to vacuum and self-clean the membrane separation recovery pipeline. During the process, the system compares the vacuum value collected by the vacuum gauge with the parameter setting value. When the vacuum value is less than the parameter value, the system starts timing. After the preset timing time, the system alarms. After confirmation, the electric ball valves MV1~7, solenoid valve DV1, and vacuum pump M4 are closed in turn, prompting the operator to close the manual ball valves V1~10. The vacuum self-cleaning ends and the membrane separation recovery test begins; Membrane separation recovery test: The operator clicks the function button of membrane separation recovery test on the display interface of the industrial computer. After startup, the environmental simulation component (1) is turned on to simulate the working environment temperature, the air supply device (2) prepares the SF6 / N2 mixed gas, the cryogenic treatment filling device (4) precools, and the heating component (55) is preheated. The system compares the P1 pressure value of the mixed gas storage tank (31) collected by the pressure sensor P1 with the lower limit of the parameter setting value. When the P1 pressure value is greater than the lower limit of the parameter value, the system alarms. When the P1 pressure value is greater than the upper limit of the parameter value, the air supply device (2) is automatically closed. After confirmation, the compressor M3 and the pressure sensor M4 are turned on in sequence. The compressor M2, the compressor M1, the electric ball valve MV1, and the electric ball valve MV3 are used to separate and recycle the SF6 / N2 mixed gas into the cryogenic treatment filling device (4). The system records and stores the flow meter, the weighing sensor (563) of the tail gas treatment monitoring component (56), the SF6 monitor (564), the temperature of the temperature controller, the pressure sensors P1-6, and the data information temperature sensors T1-4 in real time. During the process, the liquid level value of the cryogenic treatment filling device (4) collected by the system is compared with the parameter setting value. When the liquid level value is greater than the parameter value, the system alarms and resets the above electrical components. The membrane separation recovery test is completed and the data is sorted. ②Membrane separation fusion recovery Preparation: Connect the self-sealing joints J1 / 4, J9 / 2, J3 / 5, J27 / 10, J11 / 20, J21 / 25, J7~8, and J23 / J22 through high-pressure corrugated hoses respectively, and connect J26 to the discharge port of the test chamber through a high-pressure corrugated hose for further analysis; Vacuum self-cleaning: Open the manual ball valves V1~3 and V7~8. The operator clicks the function button to select the vacuum function on the industrial computer display interface. After startup, the electric ball valves MV1 / MV3 / MV6 / MV7, vacuum pump M4 and solenoid valve DV1 are turned on. At this time, the operator slowly opens the manual ball valve V4 to vacuum and self-clean the membrane separation fusion recovery pipeline. During the process, the vacuum value collected by the system is compared with the parameter setting value. When the vacuum value is less than the parameter value, the system starts timing. After the preset timing time, the system alarms. After confirmation, the electric ball valves MV1 / MV3 / MV6 / MV7, solenoid valve DV1 and vacuum pump M4 are closed in turn, prompting the operator to close the manual ball valves V1~3 and V7~8. The vacuum self-cleaning ends and the membrane separation fusion recovery test begins; Membrane separation fusion recovery: The operator clicks the function button of membrane separation fusion recovery test on the display interface of the industrial computer. After startup, the environmental simulation component (1) is turned on to simulate the working environment temperature, the air supply device (2) is equipped to prepare the SF6 / N2 mixed gas, the cryogenic treatment filling device (4) is precooled, and the heating component (55) is preheated. The precooling temperature value of the cryogenic treatment filling device (4) collected by the system is compared with the parameter setting value. When the precooling temperature value is less than the parameter value, the system alarms. After confirmation, the compressor M1, the electric ball valve MV1, and the electric ball valve MV3 are opened in sequence to pump the mixed gas into the gas storage tank of the mixed gas buffer component (3). The P1 pressure value collected by the system is compared with the parameter setting value. When the P1 pressure value is greater than the parameter value, the system alarms and opens the manual valve V2. The pressurized mixed gas enters The liquid enters the cryogenic treatment filling device (4) for cooling and liquefaction collection. The pressure value of the cryogenic treatment filling device (4) collected by the system is compared with the parameter setting value. When the pressure value of the cryogenic treatment filling device (4) is greater than the parameter value, the system alarms and opens the exhaust valve of the cryogenic treatment filling device (4) to enter the heating component (55), the three-stage membrane component, and the tail gas treatment monitoring component (56) to separate and recover the tail gas membrane combined with the adsorbent. The system records and stores the flow meter, weighing instrument, SF6 monitor, temperature controller temperature, pressure sensors P1~4 and data information temperature sensor T1 / 4 in real time. During the process, the liquid level value of the cryogenic treatment filling device (4) collected by the system is compared with the parameter setting value. When the liquid level value is greater than the parameter value, the system alarms and resets the above-mentioned electrical components. The membrane separation fusion recovery test is completed and data is sorted.

9. A SF6 / N2 mixed gas separation and recovery simulation system as claimed in claim 7, characterized in that: The performance test of key components of SF6 / N2 mixed gas separation and recovery includes: Preparation: Connect the self-sealing joints J1-2, J3-4, J5-6, J7-8, J9-10, J11-12, J13-14, J15-16, J17-18, J19-20, J21 / J25, J22 / JK, J23 / JK, and J24 / JK through high-pressure corrugated hoses respectively, and connect J26 to the discharge port of the detection room through a high-pressure corrugated hose for further analysis; ①Recycling speed test Vacuum self-cleaning: Open the manual ball valves V1~3 and V5~10. The operator clicks the function button to select the vacuum function on the industrial computer display interface. After startup, the electric ball valves MV1~7, vacuum pump M4, and solenoid valve DV1 are turned on. At this time, the operator slowly opens the manual ball valve V4 to vacuum and self-clean the membrane separation recovery pipeline. During the process, the vacuum value collected by the system is compared with the parameter setting value. When the vacuum value is less than the parameter value, the system starts timing. After the preset timing time, the system alarms. After confirmation, the electric ball valves MV1~7, solenoid valve DV1, and vacuum pump M4 are closed in turn, prompting the operator to close the manual ball valves V1~10. The vacuum self-cleaning ends and the membrane separation recovery test begins; Recovery speed test: the operator clicks the function button for selecting membrane separation recovery speed test on the display interface of the industrial computer. After startup, the environmental simulation component (1) is turned on to adjust the temperature of the environmental chamber to 20°C, the air supply device (2) is equipped to prepare the SF6 / N2 mixed gas, the cryogenic treatment filling device (4) is precooled, and the heating component (55) is preheated. When the P1 pressure value collected by the system = 0.8MPa, the system alarms. After confirmation, the compressor M3, the compressor M2, the compressor M1, the electric ball valve MV1, and the electric ball valve MV3 are turned on in sequence to separate and recover the SF6 / N2 mixed gas into the cryogenic treatment filling device (4). When the P2 pressure value reaches a predetermined value, the system opens the solenoid valve DV2, the vacuum compressor M5 and the electric ball valve MV2. When the P1 pressure value collected by the system reaches a predetermined value, the recovery time and the flow meter data are recorded to calculate the recovery speed. ② Vacuuming speed test: Confirm that the manual ball valves V1~10 are in the closed state and the PG1 pressure is at the preset value. The operator clicks the function button for vacuuming speed test on the industrial computer display interface. After startup, the environmental simulation component (1) is turned on to adjust the temperature of the environmental chamber to the target temperature value. After the temperature of the environmental chamber reaches the target temperature value, the vacuum pump M4 and the solenoid valve DV1 are turned on and the operator opens the manual ball valves V2~4. Vacuuming is performed until the vacuum gauge displays a preset value. The vacuuming time and the vacuum gauge data are recorded and the vacuuming speed is calculated. ③ Exhaust quality durability test: The operator clicks the function button for membrane separation recovery speed test on the industrial computer display interface. After startup, the environmental simulation component (1) is turned on to adjust the temperature of the environmental chamber to the target temperature, the air supply device (2) is equipped to prepare the SF6 / N2 mixed gas, the cryogenic treatment filling device (4) is precooled, and the heating component (55) is preheated. When the P1 pressure value collected by the system reaches a predetermined value, the system alarms. After confirmation, the compressor M3, the compressor M2, the compressor M1, the electric ball valve MV1, and the electric ball valve MV3 are turned on in sequence to separate and recover the SF6 / N2 mixed gas into the cryogenic treatment filling device (4). When the P2 pressure value reaches a predetermined value, the system opens the solenoid valve DV2, the vacuum compressor M5 and the electric ball valve MV2. When the residual SF6 content in the discharge port N2 is monitored by the SF6 monitor in real time and reaches a predetermined value, the weighing weight, the flow meter mass and the separation recovery time are recorded.

10. A method for simulation using a SF6 / N2 mixed gas separation and recovery simulation system according to any one of claims 1 to 9, characterized in that: The original state of all manual ball valves, electric ball valves and solenoid valves is closed. All self-sealing joints are closed when not connected to high-pressure corrugated hoses and open after being connected to high-pressure corrugated hoses. The simulation methods include: SF6 / N2 mixed gas separation and recovery test and SF6 / N2 mixed gas separation and recovery key component performance test.

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