A pneumatic gas butterfly valve sealing test system and test method

Abstract

The application provides a kind of pneumatic gas butterfly valve tightness test system, including gas generating device, import side pneumatic butterfly valve, gas heating device, export side pneumatic butterfly valve and waste gas treatment device;The gas generating device is connected by first pneumatic tee valve and main gas pipeline, and the waste gas treatment device is connected by second pneumatic tee valve and main gas pipeline;It also includes temperature sensor and first gas pressure sensor arranged at the gas outlet side of gas heating device, second gas pressure sensor installed at the air outlet of export side pneumatic butterfly valve and first smoke sensor installed on export side pneumatic butterfly valve.The beneficial effect: the test system generates gas by gas generating device, secondary heating and pressure regulating method to meet the strict test requirements.Test gas can be recycled multiple times by gas heating device and cooling device for multiple variable tests, reducing test cost and improving gas utilization rate.

Description

Technical Field

[0001] This invention relates to a sealing performance testing system, specifically a sealing performance testing system and method for a pneumatic gas butterfly valve, belonging to the field of sealing performance testing technology. Background Technology

[0002] The STC pneumatic butterfly valve is a key component controlling the intake and exhaust pipes of a marine diesel engine's sequential turbocharging system. Its operating temperature reaches up to 650℃, and its pressure reaches 4 kg. The gas flowing through the pipes is high-temperature, toxic exhaust gas produced by the marine engine's combustion. If the butterfly valve's sealing performance is poor, causing exhaust gas leakage, the increased gas concentration in the compartment can easily lead to poisoning or explosion, seriously endangering safety.

[0003] The sealing performance of pneumatic butterfly valves used in marine engine STC systems is mainly reflected in two aspects: the seal between the butterfly plate and the valve seat in the bore direction and the axial seal of the valve shaft. Using the engine directly as the gas generator for high-temperature sealing tests is expensive and has low gas utilization. When the gas flow rate in the pipeline is too slow during the test, the engine is prone to surge, affecting the accuracy of the test results. Furthermore, sealing tests require testing multiple sets of data under various temperature and pressure conditions, while engines are typically set to a fixed operating cycle, which cannot meet the actual testing requirements.

[0004] By employing a gas generator to generate gas for secondary heating and pressure regulation, the experimental environment requirements can be accurately controlled. After the experiment, the gas is cooled by a cooling device and can be recycled to complete multiple sets of experiments, improving gas utilization while reducing costs and environmental pollution. Summary of the Invention

[0005] Objective of the Invention: To address the shortcomings of existing technologies, this invention provides a pneumatic gas butterfly valve sealing performance testing system and method. This testing system utilizes a gas generator to generate gas, which is then heated and pressurized to meet stringent testing requirements. The test gas can be repeatedly recycled through a gas heating and cooling device for multiple sets of variable tests, reducing testing costs and improving gas utilization.

[0006] Technical Solution: A pneumatic gas butterfly valve sealing performance testing system includes a gas generator, an inlet-side pneumatic butterfly valve, a gas heating device, an outlet-side pneumatic butterfly valve, and an exhaust gas treatment device. The gas generator is connected to the main gas pipeline via a first pneumatic three-way ball valve, and the exhaust gas treatment device is connected to the main gas pipeline via a second pneumatic three-way ball valve. The system also includes a temperature sensor and a first gas pressure sensor located on the outlet side of the gas heating device, a second gas pressure sensor installed at the outlet of the outlet-side pneumatic butterfly valve, and a first smoke sensor installed on the direct sealing cover of the outlet-side pneumatic butterfly valve. The temperature sensor and the first gas pressure sensor are respectively connected to the control host via a digital-to-analog converter.

[0007] This invention replaces the engine with a gas generator for testing. Through a gas heating device and the control of two butterfly valves (the inlet-side pneumatic butterfly valve is a tested and qualified valve, while the outlet-side pneumatic butterfly valve is the valve to be tested), the experimental gas is heated to simulate the working environment of the pneumatic butterfly valve and test its sealing performance. This solves the problems of low gas utilization and high cost associated with directly using an engine as the gas generator for high-temperature sealing tests, and the need to test multiple sets of data under various temperature and pressure conditions, while engines are typically set to a fixed working cycle, failing to meet actual testing requirements. High-precision pressure and temperature sensors are used, and a digital-to-analog converter transmits the pressure and temperature information to a computer. This method enables real-time monitoring and remote control of the testing environment, allowing for timely intervention when pressure and temperature change during the test, ensuring the accuracy of the test results.

[0008] A flow control assembly is provided in the pipeline between the first pneumatic three-way ball valve and the inlet-side pneumatic butterfly valve. The flow control assembly includes a flow proportional control solenoid valve, a controller, and a current input meter. The flow proportional control solenoid valve is installed on the main gas pipeline. The controller is signal-connected to the flow proportional control solenoid valve, and the current input meter is signal-connected to the controller.

[0009] Using a flow ratio control solenoid valve can achieve quantitative control of the gas flow rate in the pipeline. When the gas flow rate in the pipeline is too slow, the input current value of the input meter is reduced, the solenoid valve plunger and valve seat descend, the valve opening radius decreases, the gas pressure before the valve is greater than the pressure after the valve, the gas flow rate increases, and the gas circulation in the pipeline is promoted.

[0010] The gas heating device is connected to an auxiliary gas chamber, which is equipped with a push plate. The push plate is moved by an electric push rod to change the gas pressure inside the main gas pipeline.

[0011] By utilizing the internal circulation of the test gas pipeline and the pressure regulation of the variable volume auxiliary gas chamber, multiple sets of tests with different requirements can be completed using a small amount of gas, thus shortening the test time and saving costs.

[0012] A gas cooling device is installed in the pipeline between the pneumatic butterfly valve on the outlet side and the waste gas treatment device. The gas cooling device includes a cooling box and spiral condenser tubes arranged in parallel inside the cooling box. The two ends of the condenser tubes are connected to water tanks on both sides, and the water tanks on both sides are provided with water inlet and water outlet respectively. The middle part of the cooling box is separated by a gas-liquid separation plate.

[0013] In the experiment, the experimental gas was cooled once after each set of tests to avoid multiple consecutive tests. If the pneumatic butterfly valve leaks, the number of gas moles in the high-temperature experimental area will gradually decrease, affecting the accuracy of the test. At the same time, multiple consecutive tests will cause the push plate to push outward continuously, eventually exceeding the limited range of the push rod, resulting in a decrease in test accuracy. By adopting the method of multiple cooling and multiple tests, the accuracy of the test data can be effectively increased.

[0014] The gas heating device includes a heating chamber and a heating rod. The heating chamber is provided with an outer lining, a heat insulation layer and an inner lining in sequence from the outside to the inside. Flanges are fixedly installed at both ends of the heating chamber, and the heating rod is fixedly connected to the flanges on both sides at both ends.

[0015] In the gas heating device, the electromagnetic coil is made of cast copper, and the heating metal rods are multiple rods connected in parallel, made of tantalum. The metal rods do not directly contact the electromagnetic heating coil to prevent the coil from failing due to excessive temperature.

[0016] The inlet pipe of the exhaust gas treatment device is equipped with a second smoke sensor.

[0017] The auxiliary gas chamber has the same structure as the gas heating device, wherein the heat insulation layer is rock wool, and the edge of the push plate is tightly connected to the inner wall of the auxiliary gas chamber through a K-type metal sealing ring.

[0018] A method for testing the sealing performance of a pneumatic gas butterfly valve includes the following steps:

[0019] Step 1: Prepare for the test. Open the pneumatic butterfly valves on the inlet and outlet sides of the main gas pipeline. Connect the gas generator and the exhaust gas treatment device to the main gas pipeline. Turn on the gas generator and add heavy oil fuel and oxidant. Turn on the exhaust gas treatment device. The test gas is generated by the gas generator and introduced into the pipeline. Expel the air from the main gas pipeline. Use the concentration of particulate matter in the environment detected by the second smoke sensor to determine whether the test gas fills the entire system loop.

[0020] Step 2: Perform a pneumatic butterfly valve sealing test. Close the inlet and outlet pneumatic butterfly valves. Heat the gas in the closed pipeline according to the current experimental requirements. The temperature and pressure sensors transmit the temperature and pressure signals of the test area to the control host through a digital-to-analog converter.

[0021] By pushing the push plate, the gas pressure inside the tube is controlled to meet the pressure requirements of different tests.

[0022] Record the change in pressure over time measured by the second gas pressure sensor after the outlet pneumatic butterfly valve and the change in smoke concentration over time measured by the first smoke sensor at the direct sealing cover of the inlet pneumatic butterfly valve.

[0023] Step 3: Clean up after the test, turn off the gas heating device and the gas cooling device, open the inlet side pneumatic butterfly valve and the outlet side pneumatic butterfly valve, open the second pneumatic three-way ball valve to connect the pipeline to the exhaust gas treatment device, turn on the exhaust gas treatment device, introduce air to discharge the exhaust gas in the pipeline into the exhaust gas treatment device, and use the concentration of environmental particulate matter detected by the second smoke sensor to determine whether the test exhaust gas has been discharged completely.

[0024] In step 1, when the concentration of ambient particulate matter displayed by the second smoke sensor rises sharply and then tends to stabilize, it is determined that the air inside the pipe has been discharged.

[0025] In step 2, after completing a set of temperature and pressure values, open the inlet pneumatic butterfly valve and the outlet pneumatic butterfly valve, open the gas cooling device, and pass the high-temperature gas through the gas cooling device to lower the temperature of the experimental gas. The gas then circulates in the pipeline. When the temperature of the experimental gas in the pipeline drops to 250°C~300°C, the next set of tests can begin.

[0026] The method for determining the axial sealing performance of a pneumatic butterfly valve is to observe the change in smoke concentration over time measured by the first smoke sensor at the direct sealing cover of the inlet side of the pneumatic butterfly valve. When the detected ambient particulate matter concentration exceeds 35 μg / m³, the axial sealing performance is determined. 3 If so, the axial sealing performance of the pneumatic butterfly valve is deemed unqualified.

[0027] The method for judging the axial sealing performance of a pneumatic butterfly valve is to observe the change in pressure measured by the second gas pressure sensor after the outlet side of the pneumatic butterfly valve over time. When the change in the value of the second pressure sensor during the experiment exceeds 0.3 MPa, the radial sealing performance of the pneumatic butterfly valve is deemed unqualified.

[0028] In step 3, when the concentration of ambient particulate matter displayed by the second smoke sensor drops sharply and tends to stabilize, it is determined that the experimental gas in the tube has been discharged. Beneficial effects

[0029] This testing system solves the problems of low gas utilization and high cost associated with directly using engines as gas generators for high-temperature sealing tests. Furthermore, sealing tests require multiple sets of data under various temperature and pressure conditions, while engines are typically set to a fixed operating cycle, failing to meet practical testing requirements. By utilizing internal circulation in the test gas pipeline and a variable-volume auxiliary gas chamber for pressure regulation, a smaller amount of gas can be reused to complete multiple sets of tests with different requirements, shortening testing time and saving costs.

[0030] High-precision pressure and temperature sensors are used, and a digital-to-analog converter is used to transmit the pressure and temperature information in the experiment to a computer. This method enables real-time monitoring and remote control of the experimental environment. When the pressure and temperature change during the experiment, corresponding measures are taken in a timely manner to ensure the accuracy of the experimental results.

[0031] Using a flow ratio control solenoid valve can achieve quantitative control of the gas flow rate in the pipeline. When the gas flow rate in the pipeline is too slow, the input current value of the input meter is reduced, the solenoid valve plunger and valve seat descend, the valve opening radius decreases, the gas pressure before the valve is greater than the pressure after the valve, the gas flow rate increases, and the gas circulation in the pipeline is promoted. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the overall structure of the experimental apparatus of the present invention.

[0034] Figure 2 This is a structural diagram of the gas cooling device of the present invention.

[0035] Figure 3 This is a structural diagram of the gas heating device and the auxiliary gas chamber of the present invention.

[0036] Figure 4 This is a structural diagram of the pneumatic butterfly valve installation on the outlet side of the present invention.

[0037] Figure 5 This is a structural diagram of the second smoke sensor of the present invention.

[0038] Figure 6 This is a schematic diagram of the test system of the present invention.

[0039] Figure 7 This is a flowchart of the testing process for this invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] A pneumatic gas butterfly valve sealing performance testing system includes a gas generator 1, an inlet-side pneumatic butterfly valve 2, a gas heating device 3, an outlet-side pneumatic butterfly valve 4, and an exhaust gas treatment device 5. The gas generator 1 is connected to the main gas pipeline via a first pneumatic three-way ball valve 6, and the exhaust gas treatment device 5 is connected to the main gas pipeline via a second pneumatic three-way ball valve 7. The system also includes a temperature sensor 8 and a first gas pressure sensor 9 installed on the outlet side of the gas heating device 3, a second gas pressure sensor 10 installed at the outlet of the outlet-side pneumatic butterfly valve 4, and a first smoke sensor 11 installed on the direct sealing cover of the outlet-side pneumatic butterfly valve 4. The temperature sensor 8 and the first gas pressure sensor 9 are respectively connected to the control host 12 via a digital-to-analog converter 13.

[0044] This invention replaces the engine with a gas generator 1 for testing. The experimental gas is heated by a gas heating device 3 and controlled by butterfly valves on both sides, simulating the working environment of the pneumatic butterfly valve to test its sealing performance. This solves the problems of low gas utilization and high cost associated with directly using an engine as the gas generator for high-temperature sealing tests, and the need to test multiple sets of data under various temperature and pressure conditions, while engines are typically set to a fixed working cycle, failing to meet actual testing requirements. High-precision pressure and temperature sensors 8 are used, and a digital-to-analog converter 13 transmits the pressure and temperature information to a computer. This method enables real-time monitoring and remote control of the testing environment, allowing for timely intervention when pressure and temperature change during the test, ensuring the accuracy of the test results.

[0045] A flow control assembly is provided in the pipeline between the first pneumatic three-way ball valve 6 and the inlet-side pneumatic butterfly valve 2. The flow control assembly includes a flow proportional control solenoid valve 14, a controller 15, and a current value input meter 16. The flow proportional control solenoid valve 14 is installed on the main gas pipeline. The controller 15 is signal-connected to the flow proportional control solenoid valve 14, and the current value input meter 16 is signal-connected to the controller 15.

[0046] Using the flow ratio control solenoid valve 14, the gas flow rate in the pipeline can be quantitatively controlled. When the gas flow rate in the pipeline is too slow, the input current value of the input current in the input table 16 is reduced, the solenoid valve plunger and valve seat descend, the valve opening radius decreases, the gas pressure before the valve is greater than the pressure after the valve, the gas flow rate increases, and the gas circulates in the pipeline.

[0047] The gas heating device 3 is connected to an auxiliary gas chamber 18, and a push plate 19 is provided in the auxiliary gas chamber 18. The push plate 19 is moved by an electric push rod 20 to change the gas pressure inside the main ventilation pipe.

[0048] By utilizing the internal circulation of the test gas pipeline and the pressure regulation of the variable volume auxiliary gas chamber 18, a small amount of gas can be reused to complete multiple sets of tests with different requirements, shortening the test time and saving costs.

[0049] A gas cooling device 21 is installed in the pipeline between the pneumatic butterfly valve 4 on the outlet side and the waste gas treatment device 5. The gas cooling device 21 includes a cooling box and a spiral condenser tube 211 arranged in parallel inside the cooling box. The two ends of the condenser tube 211 are respectively connected to two water tanks 212 on both sides. The two water tanks 212 are respectively provided with water inlet and water outlet. The middle part of the cooling box is separated by a gas-liquid separation plate 213.

[0050] In the experiment, the experimental gas was cooled once after each set of tests to avoid multiple consecutive tests. If the pneumatic butterfly valve leaks, the number of gas moles in the high-temperature experimental area will gradually decrease, affecting the accuracy of the test. At the same time, multiple consecutive tests will cause the push plate 19 to push outward continuously, eventually exceeding the limited range of the push rod, resulting in a decrease in test accuracy. By adopting the method of multiple cooling and multiple tests, the accuracy of the test data can be effectively increased.

[0051] The gas heating device 3 includes a heating box and a heating rod 31. The heating box is provided with an outer lining layer 32, a heat insulation layer 33 and an inner lining layer 34 from the outside to the inside. Flanges are fixedly provided at both ends of the heating box, and the heating rod 31 is fixedly connected to the flanges on both sides at both ends.

[0052] In the gas heating device 3, the electromagnetic coil is made of cast copper, and the heating metal rods are multiple rods connected in parallel and made of tantalum. The metal rods do not directly contact the electromagnetic heating coil to prevent the coil from failing due to excessive temperature.

[0053] The exhaust gas treatment device 5 is equipped with a second smoke sensor 22 at its air inlet pipe.

[0054] The auxiliary gas chamber 18 has the same box structure as the gas heating device 3. The shell of the auxiliary gas chamber 18 includes an outer lining layer 32, a heat insulation layer 33 and an inner lining layer 34. The heat insulation layer 33 is made of rock wool. The edge of the push plate 19 is tightly connected to the inner wall of the auxiliary gas chamber 18 through a K-type metal sealing ring.

[0055] The addition of an air chamber and a gas heating device with the same outer shell structure saves unnecessary design and processing time during production, thus reducing manufacturing costs.

[0056] This embodiment describes a method for testing the sealing performance of a pneumatic gas butterfly valve. The tested temperature range is 550℃ to 700℃, and the tested pressure range is 0.5 MPa to 1 MPa. The method specifically includes the following steps:

[0057] Step 1: Prepare for the test. Open the pneumatic butterfly valve 2 on the inlet side and the pneumatic butterfly valve 4 on the outlet side of the main gas pipeline. Connect the gas generator 1 and the exhaust gas treatment device 5 to the main gas pipeline. Turn on the gas generator 1 and add heavy oil fuel and oxidant. Turn on the exhaust gas treatment device 5. The test gas is generated by the gas generator 1 and introduced into the pipeline. The air in the main gas pipeline is emptied. The concentration of environmental particulate matter detected by the second smoke sensor 22 is used to determine whether the test gas fills the entire system loop.

[0058] In step 1, when the concentration of ambient particulate matter displayed by the second smoke sensor 22 rises sharply and then tends to stabilize, it is determined that the air inside the pipe has been discharged.

[0059] Step 2: Perform a pneumatic butterfly valve sealing test. Close the inlet-side pneumatic butterfly valve 2 and the outlet-side pneumatic butterfly valve 4. Heat the gas in the closed pipeline according to the current experimental requirements. The temperature sensor 8 and the pressure sensor transmit the temperature and pressure signals of the test area to the control host 12 through the digital-to-analog converter 13.

[0060] By pushing the push plate 19, the gas pressure value inside the tube is controlled to meet the pressure requirements corresponding to different tests;

[0061] Record the change in pressure measured by the second gas pressure sensor 10 after the outlet side pneumatic butterfly valve 4 over time and the change in smoke concentration measured by the first smoke sensor 11 at the direct sealing cover of the inlet side pneumatic butterfly valve 2 over time.

[0062] In step 2, after completing a set of temperature and pressure values, the inlet pneumatic butterfly valve 2 and the outlet pneumatic butterfly valve 4 are opened, and the gas cooling device 21 is opened. The high-temperature gas is passed through the gas cooling device 21 to lower the temperature of the experimental gas and circulate in the pipeline. When the temperature of the experimental gas in the pipeline drops to 250℃~300℃, the next set of tests can be started.

[0063] The method for determining the axial sealing performance of a pneumatic butterfly valve is to observe the change in smoke concentration over time measured by the first smoke sensor 11 at the direct sealing cover of the pneumatic butterfly valve 2 on the inlet side. When the detected ambient particulate matter concentration exceeds 35 μg / m³, the axial sealing performance is determined. 3 If so, the axial sealing performance of the pneumatic butterfly valve is deemed unqualified.

[0064] The method for judging the axial sealing performance of the pneumatic butterfly valve is to observe the change of pressure measured by the second gas pressure sensor 10 after the pneumatic butterfly valve 4 on the outlet side over time. When the change of the value of the second pressure sensor during the experiment exceeds 0.3 MPa, the radial sealing performance of the pneumatic butterfly valve is deemed unqualified.

[0065] Step 3: Clean up after the test, turn off the gas heating device 3 and the gas cooling device 21, open the inlet side pneumatic butterfly valve 2 and the outlet side pneumatic butterfly valve 4, open the second pneumatic three-way ball valve 7 to connect the pipeline with the exhaust gas treatment device 5, open the exhaust gas treatment device 5, and introduce air to discharge the exhaust gas in the pipeline into the exhaust gas treatment device 5. Use the concentration of environmental particulate matter detected by the second smoke sensor 22 to determine whether the test exhaust gas has been completely discharged.

[0066] In step 3, when the concentration of ambient particulate matter displayed by the second smoke sensor 22 drops sharply and tends to stabilize, it is determined that the experimental gas in the tube has been discharged.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0068] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A test method for a pneumatic gas butterfly valve sealing performance testing system, characterized in that: The testing system includes a gas generator (1), an inlet-side pneumatic butterfly valve (2), a gas heating device (3), an outlet-side pneumatic butterfly valve (4), and a waste gas treatment device (5). The gas generator (1) is connected to the main gas pipeline via a first pneumatic three-way ball valve (6), and the waste gas treatment device (5) is connected to the main gas pipeline via a second pneumatic three-way ball valve (7). The system also includes a temperature sensor (8) and a first gas pressure sensor (9) installed on the outlet side of the gas heating device (3), a second gas pressure sensor (10) installed at the outlet of the outlet-side pneumatic butterfly valve (4), and a first smoke sensor (11) installed at the direct sealing cover of the outlet-side pneumatic butterfly valve (4). The temperature sensor (8) and the first gas pressure sensor (9) are respectively connected to the control host (12) via a digital-to-analog converter (13). The gas heating device (3) is connected to an auxiliary gas chamber (18), and a push plate (19) is provided in the auxiliary gas chamber (18). The push plate (19) is moved by an electric push rod (20) to change the gas pressure inside the main gas pipeline. A gas cooling device (21) is installed in the pipeline between the outlet-side pneumatic butterfly valve (4) and the waste gas treatment device (5). The exhaust gas treatment device (5) is equipped with a second smoke sensor (22) in its air inlet pipe. The testing method includes the following steps: Step 1: Prepare for the test. Open the pneumatic butterfly valve (2) on the inlet side and the pneumatic butterfly valve (4) on the outlet side of the main gas pipeline. Connect the gas generator (1) and the exhaust gas treatment device (5) to the main gas pipeline. Turn on the gas generator (1), add heavy oil fuel and oxidant, and turn on the exhaust gas treatment device (5). The test gas is generated by the gas generator (1) and introduced into the pipeline. Empty the air in the main gas pipeline. Use the concentration of environmental particulate matter detected by the second smoke sensor (22) to determine whether the test gas fills the entire system loop. Step 2: Perform a sealing test on the pneumatic butterfly valve. Close the pneumatic butterfly valve (2) on the inlet side and the pneumatic butterfly valve (4) on the outlet side. Heat the gas in the closed pipeline according to the current experimental requirements. The temperature sensor (8) and the pressure sensor transmit the temperature and pressure signals of the test area to the control host (12) through the digital-to-analog converter (13). By pushing the push plate (19), the gas pressure value inside the tube is controlled to meet the pressure requirements corresponding to different tests; Record the change of pressure measured by the second gas pressure sensor (10) at the outlet of the pneumatic butterfly valve (4) over time and the change of smoke concentration measured by the first smoke sensor (11) at the direct sealing cover of the pneumatic butterfly valve (4) over time; After completing a set of temperature and pressure tests, open the inlet pneumatic butterfly valve (2) and the outlet pneumatic butterfly valve (4), open the gas cooling device (21), pass the high temperature gas through the gas cooling device (21) to lower the temperature of the test gas, and circulate it in the pipeline. When the temperature of the test gas in the pipeline drops to 250℃~300℃, the next set of tests can be started. Step 3: Clean up after the test, turn off the gas heating device (3) and the gas cooling device (21), open the inlet side pneumatic butterfly valve (2) and the outlet side pneumatic butterfly valve (4), open the second pneumatic three-way ball valve (7) to connect the pipeline with the waste gas treatment device (5), open the waste gas treatment device (5), introduce air to discharge the waste gas in the pipe into the waste gas treatment device (5), and judge whether the test waste gas has been discharged by the concentration of environmental particulate matter detected by the second smoke sensor (22).

2. The test method for the pneumatic gas butterfly valve sealing performance testing system according to claim 1, characterized in that: A flow control assembly is provided in the pipeline between the first pneumatic three-way ball valve (6) and the inlet-side pneumatic butterfly valve (2). The flow control assembly includes a flow proportional control solenoid valve (14), a controller (15), and a current value input meter (16). The flow proportional control solenoid valve (14) is installed on the main gas pipeline. The controller (15) is signal-connected to the flow proportional control solenoid valve (14), and the current value input meter (16) is signal-connected to the controller (15).

3. The test method for the pneumatic gas butterfly valve sealing performance testing system according to claim 1, characterized in that: The gas cooling device (21) includes a spiral condenser tube (211) arranged in parallel. The two ends of the condenser tube (211) are connected to two water tanks (212) respectively. The two water tanks (212) are respectively provided with water inlet and water outlet. The middle part of the tank is separated by a gas-liquid separation plate (213).

4. The test method for the pneumatic gas butterfly valve sealing performance testing system according to claim 1, characterized in that: The gas heating device (3) includes a housing and a heating rod (31). The housing is provided with an outer lining (32), a heat insulation layer (33) and an inner lining (34) from the outside to the inside. Flanges are fixedly provided at both ends of the housing. The heating rod (31) is fixedly connected to the flanges on both sides at both ends.

5. The test method for the pneumatic gas butterfly valve sealing performance testing system according to claim 4, characterized in that: The auxiliary gas chamber (18) has the same box structure as the gas heating device (3), including an outer lining layer (32), a thermal insulation layer (33) and an inner lining layer (34), wherein the thermal insulation layer (33) is all made of rock wool, and the edge of the push plate (19) is tightly connected to the inner wall of the auxiliary gas chamber (18) through a K-type metal sealing ring.

6. The test method for the pneumatic gas butterfly valve sealing performance testing system according to claim 1, characterized in that: In step 1, when the concentration of environmental particulate matter displayed by the second smoke sensor (22) rises sharply and tends to stabilize, it is determined that the air in the pipe has been discharged. In step 2, the method for determining the axial sealing performance of the pneumatic butterfly valve is to observe the change in smoke concentration over time measured by the first smoke sensor (11) at the direct sealing cover of the pneumatic butterfly valve (4) on the outlet side. When the detected ambient particulate matter concentration exceeds 35 μg / m³, the axial sealing performance is determined. 3 If so, the axial sealing performance of the pneumatic butterfly valve is deemed unqualified. The method for judging the axial sealing performance of the pneumatic butterfly valve is to observe the change of pressure measured by the second gas pressure sensor (10) at the air outlet of the pneumatic butterfly valve (4) on the outlet side over time. When the change of the value of the second pressure sensor during the experiment exceeds 0.3 MPa, the radial sealing performance of the pneumatic butterfly valve is deemed unqualified. In step 3, when the concentration of environmental particulate matter displayed by the second smoke sensor (22) drops sharply and tends to stabilize, it is determined that the experimental gas in the tube has been discharged.

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