A device and method for testing natural gas-hydrogen blends for autoignition and jet fire

Abstract

The present application relates to a kind of natural gas hydrogen gas self-ignition and jet fire testing device and method, the testing device includes gas storage tank, ignition mechanism, release mechanism and multiple different mixing ratio mixed gas bottle, one end of gas storage tank is equipped with inlet, and the top of gas storage tank is equipped with outlet;Multiple mixed gas bottles are communicated with gas supply pipeline respectively, one end of gas supply pipeline is communicated with inlet, release mechanism is installed at outlet, and ignition mechanism is installed beside release mechanism.The beneficial effects of the present application are simple structure, reasonable design, which can realize the simultaneous observation and data recording of the self-ignition phenomenon and jet fire phenomenon of natural gas hydrogen mixed gas with different mixing ratio under different pressure, release diameter and other conditions, and can also carry out correlation experimental study between self-ignition / jet fire phenomenon.

Description

Technical Field

[0001] This invention relates to the field of open-space mixed gas spontaneous combustion / jet fire experimental technology, specifically to a test device and method for spontaneous combustion and jet fire testing of natural gas mixed with hydrogen. Background Technology

[0002] Current research on the spontaneous combustion characteristics of combustible gases mainly focuses on hydrogen as a single gas. However, in actual production processes, the transportation of natural gas mixed with hydrogen is more common, and research on the spontaneous combustion phenomenon of this mixture is currently lacking. Therefore, studying the spontaneous combustion characteristics of natural gas mixed with hydrogen at different blending ratios under different venting pressures, venting orifice diameters, and other factors is of guiding significance for safe production and fills a gap in this research field.

[0003] When spontaneous combustion is insufficient to form a stable and continuous combustion phenomenon, the characteristics of combustible gas jet flames can be studied using an electric ignition device. In actual production processes, combustible gas leaks are affected by factors such as gas density, tank pressure, and ambient wind speed. Over time, the concentration of leaked combustible gas may reach the explosive limit, potentially triggering an explosion upon encountering high temperatures or ignition sources. Therefore, igniting leaked gas is of significant practical and theoretical guiding importance for safe production.

[0004] The experimental apparatus and operating methods for spontaneous combustion / jet fire of natural gas-hydrogen blended gas with different blending ratios in related technologies are mainly as follows: (1) After the combustible gas reaches a certain pressure in a small gas storage tank, it is released by a rupture disc and then passes through an extension tube of a certain distance to concentrate the shock wave energy, making the spontaneous combustion phenomenon easier to occur and observe. (2) The combustible gas is released through a valve, and continuous electric ignition is performed outside the release port to observe the jet fire phenomenon under different pressures and release orifice diameters.

[0005] Although the above-mentioned experimental apparatus and operating methods can realize experimental research on spontaneous combustion / jet fire under different pressures and venting orifice diameters of combustible gas, they have the following shortcomings:

[0006] 1) The spontaneous combustion of combustible gases often depends on the installation of extension tubes, which leads to the accumulation of shock wave energy. However, in actual production processes, extension tubes are rarely present.

[0007] 2) Most studies on the spontaneous combustion of combustible gases are limited to pure hydrogen as a single component gas under different venting pressures and venting apertures. There are few studies on the spontaneous combustion of natural gas mixed with hydrogen at different blending ratios.

[0008] 3) Experimental investigations into the correlation between spontaneous combustion and jet fire phenomena of combustible gases are relatively scarce. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a test device and method for spontaneous combustion and jet fire of natural gas mixed with hydrogen, which aims to solve the problems in the prior art.

[0010] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0011] A test device for spontaneous combustion and jet fire of natural gas mixed with hydrogen includes a gas storage tank, an ignition mechanism, a venting mechanism, and multiple mixed gas cylinders with different mixing ratios. The gas storage tank has an inlet at one end and an outlet at the top. The multiple mixed gas cylinders are respectively connected to a gas supply pipeline, one end of which is connected to the inlet. The venting mechanism is installed at the outlet, and the ignition mechanism is installed next to the venting mechanism.

[0012] The beneficial effects of this invention are: during the test, combustible gas from any one of the mixed gas cylinders is continuously fed into the gas storage tank, and the pressure inside the gas storage tank increases continuously until the venting mechanism is destroyed.

[0013] After the venting mechanism is damaged, observe whether spontaneous combustion occurs at the outlet; if no spontaneous combustion occurs, ignition can be initiated through the ignition mechanism.

[0014] This invention has a simple structure and a reasonable design. It can simultaneously observe and record the spontaneous combustion and jet fire phenomena of natural gas-hydrogen blended gas with different blending ratios under different pressures and venting diameters. It can also conduct experimental research on the correlation between spontaneous combustion and jet fire phenomena.

[0015] Based on the above technical solution, the present invention can be further improved as follows.

[0016] Furthermore, the ignition mechanism includes an electric ignition electrode and an electric igniter. The electric ignition electrode is installed above the venting mechanism and is connected to the electric igniter via a circuit.

[0017] The advantage of adopting the above-mentioned further scheme is that if a spontaneous combustion flame of the mixed gas is observed during the test, there is no need to perform electric ignition; if no spontaneous combustion flame is observed, the electric ignition electrode should be controlled by an electric igniter to ignite the jet and form a jet flame, which is convenient for ignition.

[0018] Furthermore, the ignition mechanism also includes a bracket, on which the electric ignition electrode is mounted.

[0019] The advantages of adopting the above-mentioned further solution are that it has a simple structure, reasonable design, and convenient assembly by mounting the electric ignition electrode and electric igniter through the bracket.

[0020] Furthermore, the electric ignition electrode can be moved up and down and positioned on the bracket.

[0021] The advantages of adopting the above-mentioned further scheme are that the structure is simple and the design is reasonable. The ignition position can be controlled by the bracket, thereby obtaining the combustion and explosion parameters of the jet flame under different ignition positions.

[0022] Furthermore, it also includes a camera, which is fixedly installed next to the exit and its field of view is set directly facing the exit. The camera is used to capture images of spontaneous combustion or ignition at the exit.

[0023] The beneficial effect of adopting the above-mentioned further solution is that if the mixed gas spontaneous combustion flame is observed through the camera during the test, there is no need to perform electric ignition; if the spontaneous combustion flame is not observed, the electric ignition electrode should be controlled by the electric ignition device to ignite the jet and form a jet flame. Ignition is convenient and automatic observation can be achieved.

[0024] Furthermore, it also includes a thermal radiation sensing mechanism located next to the gas storage tank.

[0025] The beneficial effect of adopting the above-mentioned further solution is that during the test, the influence of flame radiation is recorded by a thermal radiation sensing mechanism, thus achieving automatic recording.

[0026] Furthermore, the thermal radiation sensing mechanism includes at least one thermal radiation sensor, and each of the thermal radiation sensors is mounted next to the gas storage tank via a support rod.

[0027] The advantage of adopting the above-mentioned further solution is that during the test, the influence of flame radiation is recorded by a thermal radiation sensor, thus achieving automatic recording.

[0028] Furthermore, the venting mechanism includes a base and a rupture disc. The base is installed at the outlet and is hollow inside with open ends. The rupture disc is fixedly installed at the upper open end of the base.

[0029] The beneficial effect of adopting the above-mentioned further solution is that the rupture disc is installed on the base, and the rupture disc will automatically break when the pressure in the gas tank reaches the pressure threshold, at which time the mixed gas in the gas tank will be ejected.

[0030] Furthermore, it also includes a vacuum pump, an inert gas cylinder, a pressure sensor, and a four-way valve. The four-way valve is provided with interface one, interface two, interface three, and interface four. Interface one is connected to the inlet, interface two is connected to one end of the gas supply pipeline, interface three is connected to the vacuum pump through a pipeline, and the pressure sensor is fixedly installed at the four interfaces. The top of the inert gas cylinder is connected to the gas supply pipeline through a pipeline.

[0031] The advantage of adopting the above-mentioned further solution is that during the test, the pressure inside the gas storage tank is detected by a pressure sensor;

[0032] Alternatively, inert gas can be introduced into the storage tank through an inert gas cylinder to purge the air inside the storage tank, thus avoiding the influence of air inside the storage tank on the test and ensuring the accuracy of the test; then, the inert gas in the storage tank can be extracted by a vacuum pump to ensure that the test can proceed normally.

[0033] This invention also relates to a test method using the natural gas hydrogen-blended gas spontaneous combustion and jet fire test device as described above, characterized by comprising the following specific steps:

[0034] The combustible gas in the mixed gas cylinder enters the gas storage tank until the venting mechanism is damaged;

[0035] Observe whether spontaneous combustion occurs at the venting mechanism. If no spontaneous combustion occurs, ignite the combustible gas jet at the venting mechanism using the ignition mechanism.

[0036] The beneficial effect of adopting the above-mentioned further scheme is that the present invention provides a test method with a simple structure and reasonable design. It can simultaneously observe and record the spontaneous combustion phenomenon and jet fire phenomenon of natural gas-hydrogen mixtures with different blending ratios under different pressures, venting diameters and other conditions. It can also conduct experimental research on the correlation between spontaneous combustion and jet fire phenomena. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the present invention.

[0038] The attached diagram lists the components represented by each number as follows:

[0039] 1. Computer; 2. Mixed gas cylinder; 3. Vacuum pump; 4. Data acquisition unit; 5. Amplifier; 6. Pressure sensor; 7. Four-way valve; 8. Base; 9. Rupture disc; 10. Inert gas cylinder; 11. Bracket; 12. Electric ignition electrode; 13. Electric igniter; 14. Camera; 15. Thermal radiation sensor; 16. Gas storage tank. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] Example 1

[0045] like Figure 1 As shown, this embodiment provides a test device for spontaneous combustion and jet fire of natural gas mixed with hydrogen, including a gas storage tank 16, an ignition mechanism, a venting mechanism, and multiple mixed gas cylinders 2 with different mixing ratios. One end of the gas storage tank 16 is provided with an inlet, and the top of the gas storage tank 16 is provided with an outlet. The multiple mixed gas cylinders 2 are respectively connected to a gas supply pipeline, one end of which is connected to the inlet. The venting mechanism is installed at the outlet, and the ignition mechanism is installed next to the venting mechanism.

[0046] During the test, combustible gas from any one of the mixed gas cylinders 2 is continuously fed into the gas storage tank 16, and the pressure inside the gas storage tank 16 continues to increase until the venting mechanism is destroyed.

[0047] After the venting mechanism is damaged, observe whether spontaneous combustion occurs at the outlet; if no spontaneous combustion occurs, ignition can be initiated through the ignition mechanism.

[0048] It should be noted that the multiple mixed gas cylinders 2 with different mixing ratios adopt existing technology, and their specific structure and principle will not be described in detail here. Each cylinder is equipped with a valve and a flow meter on its top.

[0049] This embodiment has a simple structure and reasonable design. It can simultaneously observe and record the spontaneous combustion and jet fire phenomena of natural gas-hydrogen blended gas with different blending ratios under different pressures and venting diameters. It can also conduct experimental research on the correlation between spontaneous combustion and jet fire phenomena.

[0050] Example 2

[0051] Based on Embodiment 1, in this embodiment, the ignition mechanism includes an electric ignition electrode 12 and an electric igniter 13. The electric ignition electrode 12 is installed above the venting mechanism and is connected to the electric igniter 13 via a circuit.

[0052] If a spontaneous combustion flame of the mixed gas is observed during the test, there is no need for electric ignition; if no spontaneous combustion flame is observed, the electric ignition electrode 12 should be controlled by the electric igniter 13 to ignite the jet and form a jet flame, which is convenient for ignition.

[0053] Preferably, in this embodiment, the electric igniter 13 is equivalent to a control switch, used to control the electric ignition electrode 12 to ignite, and is easy to operate.

[0054] Example 3

[0055] Based on Embodiment 2, in this embodiment, the ignition mechanism further includes a bracket 11, and the electric ignition electrode 12 is mounted on the bracket 11.

[0056] The scheme has a simple structure and reasonable design. The electric ignition electrode 12 and the electric igniter 13 are installed through the bracket 11, which makes assembly convenient.

[0057] Example 4

[0058] Based on Embodiment 3, in this embodiment, the electric ignition electrode 12 can move up and down and be positioned on the bracket 11.

[0059] The scheme has a simple structure and reasonable design. The ignition position can be controlled by the bracket 11, thereby obtaining the combustion and explosion parameters of the jet flame under different ignition positions.

[0060] Based on the above scheme, the upper end of the bracket 11 is a straight rod structure, and a sliding sleeve is slidably mounted on it. The sliding sleeve can slide up and down, and the electric ignition electrode 12 is fixedly installed on the sliding sleeve.

[0061] In addition, the aforementioned sliding sleeve is provided with a through-hole, and a locking screw is threaded into the hole. During adjustment, the sliding sleeve is manually slid to the set position, and then the locking screw is turned until one end abuts against or releases the bracket 11 to fix or release the sliding sleeve, thereby fixing or releasing the electric ignition electrode 12 to adjust the ignition position of the electric ignition electrode 12.

[0062] Example 5

[0063] Based on the above embodiments, this embodiment also includes a camera 14, which is fixedly installed next to the exit and its field of view is set directly facing the exit. The camera 14 is used to capture images of spontaneous combustion or ignition at the exit.

[0064] During the test, if the mixed gas spontaneous combustion flame is observed through the camera 14, there is no need for electric ignition; if the spontaneous combustion flame is not observed, the electric ignition electrode 12 should be controlled by the electric igniter 13 to ignite the jet and form a jet flame. Ignition is convenient and automatic observation is achieved.

[0065] Preferably, in this embodiment, the camera 14 includes a mounting bracket and a camera, with the camera fixedly mounted on the mounting bracket and facing the discharge mechanism.

[0066] It should be noted that the above-mentioned camera uses existing technology, and its specific structure and principle will not be described in detail here.

[0067] Example 6

[0068] Based on Embodiment 5, this embodiment also includes a thermal radiation sensing mechanism, which is located next to the gas storage tank 16.

[0069] During the test, the effects of flame radiation are recorded automatically using a thermal radiation sensor.

[0070] Example 7

[0071] Based on Embodiment 6, in this embodiment, the thermal radiation sensing mechanism includes at least one thermal radiation sensor 15, and each thermal radiation sensor 15 is mounted next to the gas storage tank 16 by a support rod.

[0072] During the test, the influence of flame radiation was recorded by the thermal radiation sensor 15, achieving automatic recording.

[0073] Preferably, in this embodiment, the number of the above-mentioned thermal radiation sensors 15 is preferably multiple, and the multiple thermal radiation sensors 15 are arranged from far to near next to the gas storage tank 16, respectively for recording the flame radiation effect at different distances.

[0074] Example 8

[0075] Based on the above embodiments, in this embodiment, the venting mechanism includes a base 8 and a rupture disc 9. The base 8 is installed at the outlet and is hollow inside with open ends at both the top and bottom. The rupture disc 9 is fixedly installed at the upper open end of the base 8.

[0076] The above solution uses the base 8 to install the rupture disc 9, and when the pressure in the gas storage tank 16 reaches the pressure threshold, the rupture disc 9 will automatically rupture, at which point the mixed gas in the gas storage tank 16 will be ejected.

[0077] It should be noted that the aforementioned rupture disc 9 uses existing technology. The rupture disc 9 is also known as an explosion-proof disc or explosion-proof membrane. It uses the rupture of the diaphragm to relieve pressure, and after the pressure is relieved, the container is forced to stop operating.

[0078] Based on the above design, a blasting tube with open ends is fixedly installed at the upper opening of the base 8, and the rupture disc 9 is located at the lower end of the blasting tube. The above blasting tube is reasonably designed and facilitates gas release.

[0079] Example 9

[0080] Based on Example 8, this example further includes a vacuum pump 3, an inert gas cylinder 10, a pressure sensor 6, and a four-way valve 7. The four-way valve 7 is provided with interface one, interface two, interface three, and interface four. Interface one is connected to the inlet, interface two is connected to one end of the gas supply pipeline, interface three is connected to the vacuum pump 3 through a pipeline, and the pressure sensor 6 is fixedly installed at the four interfaces. The top of the inert gas cylinder 10 is connected to the gas supply pipeline through a pipeline.

[0081] During the test, the pressure inside the gas storage tank 16 was detected by pressure sensor 6;

[0082] In addition, inert gas can be sent into the storage tank 16 through the inert gas bottle 10 to purge the air in the storage tank 16, avoid the influence of the air in the storage tank 16 on the test, and ensure the accuracy of the test; then, the inert gas in the storage tank 16 is extracted by the vacuum pump 3 to ensure the normal conduct of the test.

[0083] Based on the above scheme, this embodiment also includes a computer 1, a data acquisition unit 4, and an amplifier 5. The computer 1, the data acquisition unit 4, the amplifier 5, and the pressure sensor 6 are connected by lines.

[0084] In addition, each of the above electronic components is connected to computer 1 for communication, enabling automated control.

[0085] It should be noted that the computer 1, data acquisition unit 4 and amplifier 5 mentioned above use existing technology, and their specific structure and principle will not be described in detail here.

[0086] Based on the above scheme, the thermal radiation sensor 15 and the camera send real-time images and data to the computer 1 to observe whether spontaneous combustion occurs.

[0087] Example 10

[0088] Based on the above embodiments, this embodiment also provides a test method using the natural gas hydrogen-blended gas spontaneous combustion and jet fire test device as described above, including the following specific steps:

[0089] The combustible gas in the mixed gas cylinder 2 enters the gas storage tank 16 until the venting mechanism is destroyed;

[0090] Observe whether spontaneous combustion occurs at the venting mechanism. If no spontaneous combustion occurs, ignite the combustible gas jet at the venting mechanism using the ignition mechanism.

[0091] This embodiment provides a testing method with a simple structure and reasonable design. It can simultaneously observe and record the spontaneous combustion and jet fire phenomena of natural gas-hydrogen blended gas with different blending ratios under different pressures, venting diameters, and other conditions. It can also conduct experimental research on the correlation between spontaneous combustion and jet fire phenomena.

[0092] The working principle of this invention is as follows:

[0093] For the purpose of the experiment, rupture discs 9 with different vent diameters and pressure conditions were installed, and vacuum pump 3 was turned on to evacuate the gas storage tank 16.

[0094] Gas is introduced through the inlet valve of the pre-mixed gas cylinder 2 until the rupture disc 9 ruptures, at which point the gas supply stops, and the reading fluctuation of the pressure sensor 6 is recorded by the computer 1.

[0095] The computer 1 observes the real-time images and data from the camera 14 and the thermal radiation sensor 15. If no significant spontaneous combustion is observed, the electric ignition electrode 12 is controlled by the electric igniter 13 to ignite the combustible gas jet.

[0096] After the experiment was completed, when the reading of pressure sensor 6 dropped to the same level as atmospheric pressure, the inlet valve of inert gas cylinder 10 was opened, and the gas storage tank 16 was purged through the inlet valve for about five minutes (at this time, the outlet was open and the rupture disc 9 was not installed).

[0097] After replacing the rupture disc 9, turn on the vacuum pump 3 to extract the inert gas generated in the gas storage tank 16.

[0098] Repeat the above experimental steps to conduct the experiment.

[0099] Finally, by analyzing the images and parameters transmitted to computer 1, the characteristics of various parameters of spontaneous combustion / jet fire of natural gas-hydrogen blended gas with different blending ratios based on the experimental purpose are analyzed to provide theoretical guidance for safe production.

[0100] It should be noted that all electronic components involved in this invention adopt existing technology, and all the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is existing technology.

[0101] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0102] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test device for spontaneous combustion and jet fire of hydrogen-blended natural gas, characterized in that: The system includes a gas storage tank (16), an ignition mechanism, a venting mechanism, and multiple mixed gas cylinders (2) with different mixing ratios. One end of the gas storage tank (16) is provided with an inlet, and the top of the gas storage tank (16) is provided with an outlet. The multiple mixed gas cylinders (2) are respectively connected to a gas supply pipeline. One end of the gas supply pipeline is connected to the inlet. The venting mechanism is installed at the outlet, and the ignition mechanism is installed next to the venting mechanism. The venting mechanism includes a base (8) and a rupture disc (9). The base (8) is installed at the outlet and is hollow inside with open ends. The rupture disc (9) is fixedly installed at the upper open end of the base (8).

2. The natural gas hydrogen-blended gas spontaneous combustion and jet fire testing device according to claim 1, characterized in that: The ignition mechanism includes an electric ignition electrode (12) and an electric igniter (13). The electric ignition electrode (12) is installed above the venting mechanism and is connected to the electric igniter (13) via a line.

3. The natural gas hydrogen-blended gas spontaneous combustion and jet fire testing device according to claim 2, characterized in that: The ignition mechanism also includes a bracket (11), on which the electric ignition electrode (12) is mounted.

4. The natural gas hydrogen-blended gas spontaneous combustion and jet fire testing device according to claim 3, characterized in that: The electric ignition electrode (12) can be moved up and down and positioned on the bracket (11).

5. The natural gas hydrogen-blended gas spontaneous combustion and jet fire testing device according to any one of claims 1-4, characterized in that: It also includes a camera (14), which is fixedly installed next to the outlet and its field of view is set directly facing the outlet. The camera (14) is used to capture images of spontaneous combustion or ignition at the outlet.

6. The natural gas hydrogen-blended gas spontaneous combustion and jet fire testing device according to claim 5, characterized in that: It also includes a thermal radiation sensing mechanism located next to the gas storage tank (16).

7. The natural gas hydrogen-blended gas spontaneous combustion and jet fire testing device according to claim 6, characterized in that: The thermal radiation sensing mechanism includes at least one thermal radiation sensor (15), each of which is mounted next to the gas storage tank (16) by a support rod.

8. The natural gas hydrogen-blended gas spontaneous combustion and jet fire testing device according to any one of claims 1-4, characterized in that: It also includes a vacuum pump (3), an inert gas cylinder (10), a pressure sensor (6), and a four-way valve (7). The four-way valve (7) is provided with interface one, interface two, interface three, and interface four. Interface one is connected to the inlet, interface two is connected to one end of the gas supply pipeline, interface three is connected to the vacuum pump (3) through a pipeline, and the pressure sensor (6) is fixedly installed at the four interfaces. The top of the inert gas cylinder (10) is connected to the gas supply pipeline through a pipeline.

9. A test method using the natural gas hydrogen-blended gas spontaneous combustion and jet fire test apparatus as described in any one of claims 1-8, characterized in that, The specific steps include the following: The combustible gas in the mixed gas cylinder (2) enters the gas storage tank (16) until the venting mechanism is destroyed; Observe whether spontaneous combustion occurs at the venting mechanism. If no spontaneous combustion occurs, ignite the combustible gas jet at the venting mechanism using the ignition mechanism.

Images