Performance test system based on urban gas pipe network connecting piece and key equipment sealing material in hydrogen-doped environment

Abstract

The utility model belongs to the technical field of gas pipe networks, and particularly relates to a performance test system based on urban gas pipe network connecting pieces and key equipment sealing materials in a hydrogen-doped environment. Comprising a hydrogen cylinder, a natural gas cylinder, a gas mixing tank, a compressor, a horizontal stainless steel tank, an electric tracing band, a pressing sheet clamping device, a prestress loading measuring device, a hanging sheet clamping device, a pressure transmitter, a thermocouple temperature transmitter, a computer, a nitrogen cylinder, a flame arrester and a hydrogen concentration detector. The hydrogen cylinder and the natural gas cylinder are respectively communicated with the gas mixing tank, and an outlet of the gas mixing tank is communicated with the horizontal stainless steel tank after passing through the compressor; the nitrogen tank is respectively communicated with the horizontal stainless steel tank, the hydrogen cylinder and the natural gas cylinder; an electric tracing band, a pressing sheet clamping device, a prestress loading measuring device, a hanging sheet clamping device, a pressure transmitter and a thermocouple temperature transmitter are arranged in the horizontal stainless steel tank. The system achieves the purpose of constant temperature control.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas pipe network technical field, concretely relates to a kind of performance test system under the environment of sealing material mixing hydrogen based on city gas pipe network connecting piece and key equipment. BACKGROUND

[0002] The description of the background art of the utility model belongs to the related art related to the utility model, and is only used to illustrate and facilitate the understanding of the utility model content of the utility model, and should not be understood as applicant's explicit recognition or presumption that the utility model considers the prior art on the filing date of the first application.

[0003] With the development of green hydrogen technology, green hydrogen cost is expected to be greatly reduced, and hydrogen mixing transportation is beneficial to expand green hydrogen consumption approach and reduce carbon emissions in natural gas combustion process. The urban gas pipe network system has good development space in hydrogen mixing transportation. At present, the main research and utility model are concentrated in the hydrogen suitability and hydrogen compatibility of metal pipe materials. The hydrogen mixing adaptability of sealing members and connecting members is still insufficient.

[0004] City gas has many low-pressure pipe network connecting joints, and there are many types of key equipment such as self-closing valves, membrane meters and pressure regulators. The sealing material is mainly rubber material. Hydrogen is a small molecule gas compared with natural gas. The pressure range of medium-low pressure gas pipeline is between 3500kpa-0.4MPa. Under the action of pipeline transportation temperature, pressure, pressure stress load and different hydrogen mixing ratio, the performance of high molecular sealing material may change, which may cause leakage of hydrogen mixed natural gas in a large range. If the hydrogen mixed natural gas leaks in the city, it will cause certain safety hazards if not handled in time. It is necessary to provide a method for testing the influence of the above key elements on the performance of high molecular sealing material. It can also provide a more practical test device for testing the performance of sealing material under actual operating environment. UTILITY MODEL CONTENT

[0005] The utility model embodiment aims to provide a kind of performance test system under the environment of sealing material mixing hydrogen based on city gas pipe network connecting piece and key equipment, to solve the performance test environment simulation problem of the sealing material of town gas medium-low pressure environment hydrogen mixing pipe connecting piece and key equipment in the above background art.

[0006] A kind of performance test system under the environment of sealing material mixing hydrogen based on city gas pipe network connecting piece and key equipment, it includes: hydrogen cylinder, natural gas cylinder, gas mixing tank, compressor, horizontal stainless steel tank, electric heat tracing band, tablet pressing clamping device, pre-stress loading measuring device, hanging piece clamping device, pressure transmitter, thermocouple temperature transmitter, computer, nitrogen cylinder, flame arrester and hydrogen concentration detector;

[0007] The hydrogen cylinder and the natural gas cylinder are communicated with the mixed gas tank, and the outlet of the mixed gas tank is communicated with the horizontal stainless steel tank through a compressor;

[0008] The horizontal stainless steel tank is internally provided with an electric heat tracing band, a tablet clamping device, a prestress loading measuring device, a hanging tablet clamping device, a pressure transmitter and a thermocouple temperature transmitter; the electric heat tracing band, the pressure transmitter and the thermocouple temperature transmitter are respectively connected with a computer signal;

[0009] The outlet of the hydrogen cylinder is provided with a hydrogen pipeline flowmeter, and the outlet of the natural gas cylinder is provided with a natural gas pipeline flowmeter; the mixed gas tank is connected with a hydrogen concentration detector; the hydrogen pipeline flowmeter, the natural gas pipeline flowmeter and the hydrogen concentration detector are respectively connected with a computer signal.

[0010] Further, the outlet of the hydrogen cylinder is provided with a hydrogen cylinder outlet valve; the outlet of the natural gas cylinder is provided with a natural gas cylinder outlet valve; the inlet of the mixed gas tank is provided with a mixed gas tank front valve; the nitrogen cylinder and the horizontal stainless steel tank are provided with a nitrogen cylinder to horizontal stainless steel tank outlet valve; the nitrogen cylinder and the hydrogen cylinder are provided with a nitrogen cylinder to hydrogen tank outlet valve; the nitrogen cylinder and the natural gas cylinder are provided with a nitrogen cylinder to natural gas tank outlet valve; the mixed gas tank and the compressor are provided with a compressor inlet valve; the compressor and the horizontal stainless steel tank are provided with a compressor outlet valve; the front end of the flame arrester is provided with a vent valve.

[0011] Further, the prestress loading measuring device comprises a flange and a bolt dynamometer.

[0012] Further, the tablet clamping device comprises a circular flange plate connected with the prestress loading measuring device to jointly compress and measure the prestress value.

[0013] Further, the hanging tablet clamping device comprises a bolt and a steel plate for clamping the hanging tablet.

[0014] A performance testing method based on a city gas pipe network connecting piece and a key equipment sealing material in a hydrogen-doped environment, comprising the following steps:

[0015] S1: by adjusting the hydrogen and natural gas cylinder valve and flow control valve, the hydrogen-doped mixed gas is formed by matching;

[0016] S2: through the test sample production and installation, the prestress environment of the sealing piece is simulated;

[0017] S3: through the horizontal stainless steel tank and the electric heater installation, the closed constant temperature environment is constructed;

[0018] S4: continuously input the pressurized mixed gas into the horizontal stainless steel tank through the compressor to form a constant pressure space;

[0019] S5: after the stable constant temperature and pressure environment is constructed, record the test time;

[0020] S6: after the sealing test is completed, perform gas replacement and safe discharge.

[0021] Further, step S1 specifically includes the following steps:

[0022] According to the hydrogen and natural gas ratio parameters and test requirements, the required pressure values of hydrogen and natural gas are calculated respectively; the hydrogen cylinder valve and the flow control valve are opened, the flow meter reading is controlled within the test requirement range, the natural gas is input into the mixing tank until the pressure reaches the calculated pressure value; in the same way, the gas in the hydrogen mixed gas cylinder is input into the mixing tank; the hydrogen content in the mixing tank is analyzed by the hydrogen concentration detector and adjusted until the ratio of the natural gas and hydrogen mixed gas meets the test requirements.

[0023] Further, step S2 specifically includes the following steps:

[0024] According to different experimental conditions, two sealing test samples of the same size are prepared, one test sample is placed in the hanging piece clamping device and is in a non-pre-tightening pressure state, and the other test sample is placed in the pressing piece clamping device, and the sealing piece pressure environment is simulated through the pre-stress loading measuring device.

[0025] Further, step S3 specifically includes the following steps:

[0026] The two parts of the horizontal stainless steel tank form a sealed environment; the electric heating tape in the horizontal stainless steel tank is powered on to heat; the preheating temperature is set in the computer, the temperature of the mixed gas space in the stainless steel tank is measured by the thermocouple temperature sensor, the temperature signal is transmitted to the computer, and the heating temperature of the electric heating tape is controlled by the computer.

[0027] Further, step S4 specifically includes the following steps:

[0028] The vent valve and the nitrogen valve are in a closed state, the compressor inlet and outlet valves are opened to form a passage between the compressor and the horizontal stainless steel tank; the compressor is started, the mixed gas space environment pressure is measured by the pressure sensor in the horizontal stainless steel tank, after reaching the preset test environment pressure value in the computer, the horizontal stainless steel tank inlet valve and the compressor are closed in turn to maintain the constant pressure state of the horizontal stainless steel tank.

[0029] Further, step S5 specifically includes the following steps:

[0030] According to the sealing test requirement, the test time is recorded by the computer, when the pressure in the horizontal stainless steel tank is lower than the set value of the required test pressure by 5%, the mixed gas is pressurized according to S1 and S4, so as to guarantee the constant pressure in the horizontal stainless steel tank.

[0031] Further, the step S6 specifically comprises the following steps:

[0032] The valve between the horizontal stainless steel tank and the compressor is kept closed, the venting pipeline valve is opened, the outlet valve of the nitrogen cylinder to the horizontal stainless steel tank is opened after venting for 5 minutes, the nitrogen gas in the nitrogen cylinder is used to replace the mixed gas in the horizontal stainless steel tank and the pipeline, the outlet valves of the nitrogen cylinder to the hydrogen cylinder outlet pipeline and the nitrogen cylinder to the natural gas cylinder outlet pipeline are opened in sequence, the nitrogen gas is used to replace the hydrogen gas and the natural gas, and the gas is discharged into the atmosphere through the venting pipeline.

[0033] The embodiment of the utility model has the following beneficial effects:

[0034] The utility model discloses a kind of based on city gas pipe network connecting piece and the performance test system of key equipment sealing material under hydrogen-doped environment, solve the performance test environment simulation problem of city gas low-pressure environment hydrogen-doped pipeline connecting piece and key equipment sealing material.

[0035] Sealing test specimen prestress loading measurement simulation device.Press tablet clamping device should be placed outside horizontal stainless steel tank flange, it is convenient to press tightly sealing test sample;Through prestress loading measurement device (including bolt dynamometer), sealing piece pressure-bearing environment is simulated, and stress loading value is measured by bolt dynamometer.

[0036] Integral heating constant temperature system.Two parts of external electric tracing band of horizontal stainless steel tank can be conveniently plugged in and unplugged by connecting plug, and after connection, an integral heating constant temperature system can be formed, to achieve the purpose of constant temperature control of mixed gas environment temperature in horizontal stainless steel tank to meet test requirements.

[0037] Simple and safe venting system.Closing all valves between horizontal stainless steel tank and compressor realizes isolation;Opening venting valve, venting gas is realized by mixed gas pressure in horizontal stainless steel tank;After discharging for 5 minutes, when mixed gas pressure in horizontal stainless steel tank is consistent with external environment pressure of horizontal stainless steel tank, opening nitrogen cylinder outlet control valve, replacing mixed gas in horizontal stainless steel tank by nitrogen gas with pressure in nitrogen cylinder is realized, after completing gas replacement of hydrogen gas and natural gas, closing nitrogen cylinder outlet valve is realized.According to the operation, gas replacement of hydrogen gas pipeline and natural gas pipeline by nitrogen gas is realized. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is the structure schematic view of the utility model discloses a kind of based on city gas pipe network connecting piece and the performance test system of key equipment sealing material under hydrogen-doped environment.

[0039] Figure 2 It is a structure schematic view of the tablet clamping device in the performance test system of the sealing material of the urban gas pipe network connecting piece and key equipment under the hydrogen doping environment based on the utility model;

[0040] Figure 3 It is a structure schematic view of the tablet clamping device in the performance test system of the sealing material of the urban gas pipe network connecting piece and key equipment under the hydrogen doping environment based on the utility model;

[0041] Figure 4 It is a structure schematic view of the prestress loading measuring device in the performance test system of the sealing material of the urban gas pipe network connecting piece and key equipment under the hydrogen doping environment based on the utility model. DETAILED DESCRIPTION

[0042] The application will be further described in conjunction with the embodiments.

[0043] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, in the following description, different "an embodiment" or "embodiments" do not necessarily mean the same embodiment. Different embodiments can be replaced or combined, and other embodiments can be obtained by those skilled in the art without creative labor.

[0044] A performance test system of sealing material of urban gas pipe network connecting piece and key equipment under hydrogen doping environment based on the utility model, comprising: hydrogen cylinder 1, natural gas cylinder 2, gas mixing tank 9, compressor 11, horizontal stainless steel tank 13, electric heat tracing band 15, tablet clamping device 16, prestress loading measuring device 17, hanging piece clamping device 18, pressure transmitter 19, thermocouple temperature transmitter 20, computer 21, nitrogen cylinder 22, flame arrester 27 and hydrogen concentration detector 29;

[0045] The hydrogen cylinder 1 and the natural gas cylinder 2 are communicated with the gas mixing tank 9 respectively, 所 The outlet of the gas mixing tank 9 is communicated with the horizontal stainless steel tank 13 through the compressor 11; the nitrogen cylinder 22 is communicated with the horizontal stainless steel tank 13, the hydrogen cylinder 1 and the natural gas cylinder 2 respectively;

[0046] The horizontal stainless steel tank 13 is provided with the electric heat tracing band 15 (provided with an electric heating band connecting plug 28), the tablet clamping device 16, the prestress loading measuring device 17, the hanging piece clamping device 18, the pressure transmitter 19 and the thermocouple temperature transmitter 20; the electric heat tracing band 15, the pressure transmitter 19 and the thermocouple temperature transmitter 20 are signal connected with the computer 21 respectively; the horizontal stainless steel tank 13 is provided with a heat preservation layer 14;

[0047] The outlet of the hydrogen cylinder 1 is provided with a hydrogen pipeline flow meter 5, and the outlet of the natural gas cylinder is provided with a natural gas pipeline flow meter 6; the mixed gas tank 9 is connected with a hydrogen concentration detector 29; the hydrogen pipeline flow meter 5, the natural gas pipeline flow meter 6 and the hydrogen concentration detector 29 are respectively connected with the computer 21.

[0048] In some embodiments of the utility model, the outlet of the hydrogen cylinder 1 is provided with a hydrogen cylinder outlet valve 3, the outlet of the natural gas cylinder 2 is provided with a natural gas cylinder outlet valve 4, the inlet of the mixed gas tank 9 is provided with a mixed gas tank front valve 8 (a four-way valve 7 is arranged at the front end), the nitrogen cylinder 22 and the horizontal stainless steel tank 13 are provided with a nitrogen cylinder to horizontal stainless steel tank outlet valve 23, the nitrogen cylinder 22 and the hydrogen cylinder 1 are provided with a nitrogen cylinder to hydrogen tank outlet valve 24, the nitrogen cylinder 22 and the natural gas cylinder 2 are provided with a nitrogen cylinder to natural gas tank outlet valve 25, the mixed gas tank 9 and the compressor 11 are provided with a compressor inlet valve 10, the compressor 11 and the horizontal stainless steel tank 13 are provided with a compressor outlet valve 12, and the flame arrester 27 is provided with a vent valve 26 at the front end.

[0049] Combine with the drawings Figures 2-4 The prestress loading measuring device comprises a flange 171 and a bolt dynamometer 172.

[0050] The tablet clamping device comprises a circular flange piece 161 (containing an annular groove 163 and a bolt hole 162) connected with the prestress loading measuring device to clamp and measure the prestress value.

[0051] The hanging piece clamping device comprises a bolt 181 and a steel plate 182 for clamping the hanging piece.

[0052] A performance testing method based on a hydrogen-doped environment of sealing materials of urban gas pipeline network connecting pieces and key equipment, comprising the following steps:

[0053] S1: by adjusting the hydrogen and natural gas cylinder valve and flow control valve, the hydrogen-doped mixed gas is formed by matching;

[0054] S2: through the test sample production and installation, the prestress environment of the sealing piece is simulated;

[0055] S3: through the horizontal stainless steel tank and the electric heater installation, the closed constant temperature environment is constructed;

[0056] S4: through the compressor, the mixed gas after pressurization is continuously input into the horizontal stainless steel tank, and a constant pressure space is formed;

[0057] S5: after the stable constant temperature and constant pressure environment is constructed, the test time is recorded;

[0058] S6: Gas replacement and safety venting after the completion of the seal test test.

[0059] In some embodiments of the utility model, step S1 specifically includes the following steps:

[0060] According to hydrogen and natural gas ratio parameter and test need, hydrogen and natural gas respectively need pressure value of each calculation, open hydrogen cylinder valve and flow control valve, control flow meter show number in test requirement range, make natural gas input to mixed jar until pressure reaches calculated pressure value, according to same way, input the gas in hydrogen mixed gas cylinder to mixed jar, through hydrogen concentration detector analysis hydrogen content in mixed jar and adjust, until the ratio of natural gas and hydrogen mixed gas meets test requirement.

[0061] In some embodiments of the utility model, step S2 specifically includes the following steps:

[0062] According to different experimental conditions, two same size seal test samples are prepared, one test sample is placed in the hanging piece clamping device and is in the state of no pre-tightening pressure, and the other test sample is placed in the pressing piece clamping device, and the pre-stress loading measuring device is used to simulate the pressure bearing environment of the seal.

[0063] In some embodiments of the utility model, step S3 specifically includes the following steps:

[0064] The two parts of the horizontal stainless steel tank form a sealed environment, the electric heating tape in the horizontal stainless steel tank is powered on and heated, the preheating temperature is set in the computer, the temperature of the mixed gas space in the stainless steel tank is measured by the thermocouple temperature sensor, the temperature signal is transmitted to the computer, and the heating temperature of the electric heating tape is controlled by the computer.

[0065] In some embodiments of the utility model, step S4 specifically includes the following steps:

[0066] The vent valve and the nitrogen valve are in the closed state, the inlet and outlet valves of the compressor are opened, so that a passage is formed between the compressor and the horizontal stainless steel tank, the compressor is started, the pressure of the mixed gas space environment is measured by the pressure sensor in the horizontal stainless steel tank, after reaching the preset test environment pressure value in the computer, the inlet valve of the horizontal stainless steel tank and the compressor are closed in turn, and the constant pressure state of the horizontal stainless steel tank is maintained.

[0067] In some embodiments of the utility model, step S5 specifically includes the following steps:

[0068] According to the seal test requirement, the test time is recorded by the computer, when the pressure in the horizontal stainless steel tank is lower than 5% of the set value required by the test, the mixed gas is pressurized according to S1 and S4, so as to guarantee the constant pressure in the horizontal stainless steel tank.

[0069] In some embodiments of the utility model, step S6 specifically includes the following steps:

[0070] Keep the horizontal stainless steel tank to the compressor valve closed, open the venting pipeline valve, open the nitrogen cylinder to the outlet valve of horizontal stainless steel tank after 5 minutes of venting, realize the replacement of nitrogen to the mixed gas in horizontal stainless steel tank and pipeline by the nitrogen with pressure in nitrogen cylinder; open the outlet valve of nitrogen cylinder to hydrogen cylinder outlet pipeline and nitrogen cylinder to natural gas cylinder outlet pipeline in turn, realize the replacement of nitrogen to hydrogen and natural gas, and the gas is discharged into the atmosphere through the venting pipeline.

[0071] The utility model of a kind of based on city gas pipe network connecting piece and key equipment sealing material mixes hydrogen under the performance test system of environment, solve the performance test environment simulation problem of city gas low pressure environment mixed hydrogen pipe connecting piece and key equipment sealing material.

[0072] Seal test specimen prestress loading measurement simulation device.Press tablet clamping device should be placed outside horizontal stainless steel tank flange, to facilitate the compression of sealing test sample;Through prestress loading measurement device (including bolt dynamometer) simulate the pressure environment of sealing piece, and the stress loading value is measured by bolt dynamometer.

[0073] Integral heating constant temperature system.Two parts of external winding of horizontal stainless steel tank electric tracing heater can be conveniently plugged in and plugged out by connecting plug, and after connection, an integral heating constant temperature system can be formed, which achieves the purpose of constant temperature control of the mixed gas environment temperature in horizontal stainless steel tank to meet the test requirements.

[0074] Simple and safe venting system.Close all valves between horizontal stainless steel tank and compressor to realize isolation;Open venting valve, and vent gas by the pressure of mixed gas in horizontal stainless steel tank;After 5 minutes of discharge, the pressure of mixed gas in horizontal stainless steel tank is consistent with the external environment pressure of horizontal stainless steel tank, open the outlet control valve of nitrogen cylinder, replace the mixed gas in horizontal stainless steel tank by the nitrogen with pressure in nitrogen cylinder, close the outlet valve of nitrogen cylinder after the gas replacement of hydrogen and natural gas is completed. According to the operation, the gas replacement of hydrogen pipeline and natural gas pipeline by nitrogen is realized. Specific embodiments

[0076] A performance test method based on city gas pipe network connecting piece and key equipment sealing material under hydrogen mixing environment, comprising the following steps:

[0077] Step one: by adjusting the hydrogen and natural gas cylinder valve and flow control valve, the ratio of hydrogen volume ratio 20% of the mixed gas, the operation is as follows: according to the hydrogen and natural gas ratio parameters and 20% volume ratio of hydrogen mixed gas test requirements, according to the volume fraction pressure respectively calculate the pressure value of hydrogen and natural gas respectively required; open the hydrogen cylinder valve and flow control valve, the flow meter control in 20% hydrogen volume fraction pressure test requirements range, make the natural gas input to the mixing tank until the pressure reaches the calculated pressure value; in the same way, the 20% volume ratio of hydrogen mixed gas cylinder gas input mixing tank; through the hydrogen concentration detector analysis of hydrogen content in the mixing tank and adjustment, until the hydrogen and natural gas mixed gas ratio meets the 20% volume ratio test requirements.

[0078] Step two: by testing sample production and installation, simulate the prestressed environment of the seal, the operation is as follows: according to different experimental conditions, two identical size of seal test sample, a test sample is placed in the hanging piece clamping device, after the spiral clamping, in the no pre-tightening pressure state, another test sample is placed in the pressure piece clamping device, through the prestressed loading measuring device (including bolt dynamometer) to simulate the seal pressure environment. The specific structure is shown in the attached Figures 2-4

[0079] Step three: by installing horizontal stainless steel tank and electric heater, build a closed constant temperature environment, the operation is as follows: the two parts of the horizontal stainless steel tank are close and screwed with bolts to form a sealed environment; the electric heating tape of the two parts of the horizontal stainless steel tank is connected through the joint, and the electric heating tape is powered on to heat; set the preheating temperature in the computer (for example, 5℃), measure the temperature of the mixed gas space in the stainless steel tank through the thermocouple temperature sensor, and transmit the temperature signal to the computer. The heating temperature of the electric heating tape is controlled by the computer to meet the temperature requirement of the test environment.

[0080] Step four: by compressor, the pressurized mixed gas is continuously input into the horizontal stainless steel tank to form a constant pressure space, the specific operation is as follows: the vent valve and nitrogen valve are in closed state, the inlet and outlet valves of the compressor are opened, so that the path between the compressor and the horizontal stainless steel tank is formed; start the compressor, measure the pressure of the mixed gas space environment through the pressure sensor in the horizontal stainless steel tank, and close the inlet valve of the horizontal stainless steel tank and the compressor in turn when the pressure reaches the preset test environment pressure value in the computer, so as to maintain the constant pressure state of the horizontal stainless steel tank.

[0081] Step five: after building a stable constant temperature and constant pressure environment, record the test time, the specific operation is as follows: according to the test requirements of the seal, record the test time by computer, when the pressure in the horizontal stainless steel tank is lower than 5% of the set value required by the test, pressurize the mixed gas according to step one and step four to ensure the constant pressure in the horizontal stainless steel tank.

[0082] Step six: after the completion of the seal test test gas replacement and safety discharge, the specific operation as follows: keep horizontal stainless steel tank to compressor interval valve closed, open the vent pipe valve, vent 5 minutes after opening the nitrogen cylinder to the horizontal stainless steel tank outlet valve, using the nitrogen cylinder with pressure nitrogen to achieve the replacement of nitrogen in the horizontal stainless steel tank and pipeline mixed gas; in turn open the nitrogen cylinder to the hydrogen cylinder outlet pipeline, nitrogen cylinder to the natural gas cylinder outlet pipeline outlet valve, realize the replacement of nitrogen to hydrogen and natural gas, the gas through the vent pipe into the atmosphere.

[0083] Comparative example

[0084] It should be noted that the above examples can be freely combined as needed. The above introduction is only the preferred embodiment of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A performance testing system for sealing materials of urban gas pipeline network connectors and key equipment under hydrogen-doped environments, characterized in that, include: Hydrogen cylinders, natural gas cylinders, gas mixing tanks, compressors, horizontal stainless steel tanks, electric heating tape, pressure plate clamping devices, prestressed loading measuring devices, hanging plate clamping devices, pressure transmitters, thermocouple temperature transmitters, computers, nitrogen cylinders, flame arresters, and hydrogen concentration detectors. The hydrogen cylinder and natural gas cylinder are respectively connected to the mixing tank, and the outlet of the mixing tank is connected to the horizontal stainless steel tank after passing through the compressor; the nitrogen cylinder is respectively connected to the horizontal stainless steel tank, the hydrogen cylinder and the natural gas cylinder. The horizontal stainless steel tank is equipped with an electric heating tape, a pressure plate clamping device, a prestressing loading measuring device, a hanging plate clamping device, a pressure transmitter, and a thermocouple temperature transmitter; the electric heating tape, pressure transmitter, and thermocouple temperature transmitter are respectively connected to a computer signal. The hydrogen cylinder is equipped with a hydrogen pipeline flow meter at its outlet, and the natural gas cylinder is equipped with a natural gas pipeline flow meter at its outlet; a hydrogen concentration detector is connected to the mixing tank; the hydrogen pipeline flow meter, the natural gas pipeline flow meter, and the hydrogen concentration detector are all connected to a computer signal.

2. The performance testing system for sealing materials of urban gas pipeline network connectors and key equipment under hydrogen-doped environment as described in claim 1, characterized in that, The hydrogen cylinder outlet is equipped with a hydrogen cylinder outlet valve; the natural gas cylinder outlet is equipped with a natural gas cylinder outlet valve; the mixing tank inlet is equipped with a mixing tank front valve; a nitrogen cylinder to horizontal stainless steel tank outlet valve is provided between the nitrogen cylinder and the horizontal stainless steel tank; a nitrogen cylinder to hydrogen tank outlet valve is provided between the nitrogen cylinder and the hydrogen cylinder; a nitrogen cylinder to natural gas tank outlet valve is provided between the nitrogen cylinder and the natural gas cylinder; a compressor inlet valve is provided between the mixing tank and the compressor; a compressor outlet valve is provided between the compressor and the horizontal stainless steel tank; and a vent valve is provided at the front end of the flame arrester.

3. The performance testing system for sealing materials of urban gas pipeline network connectors and key equipment under hydrogen-doped conditions according to claim 1, characterized in that, The prestressed loading measuring device includes: a flange and a bolt force gauge.

4. The performance testing system for sealing materials of urban gas pipeline network connectors and key equipment under hydrogen-doped conditions according to claim 1, characterized in that, The aforementioned clamping device includes a circular flange, which is connected to a prestress loading measuring device to jointly clamp and measure the prestress value.

5. The performance testing system for sealing materials of urban gas pipeline network connectors and key equipment under hydrogen-doped environments as described in claim 1, characterized in that, The aforementioned hanging plate clamping device includes bolts and a steel plate for clamping the hanging plate.

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