An experimental device and method for explosion characteristics of hydrogen-doped natural gas in a confined space

Abstract

The application provides a hydrogen-doped natural gas explosion characteristic experiment device in a confined space, which comprises a pipeline system and a gas distribution system, the pipeline system comprises a driving pipe, a visible pipe and a test pipe arranged in sequence, the gas distribution system comprises a vacuum pump, an electric control valve group and a gas cylinder pipeline connected with each electric control valve in the electric control valve group, and the gas distribution system is connected with the driving pipe through a gas inlet. The hydrogen-doped natural gas explosion accident characteristic evolution and inhibition experiment of different hydrogen proportions can be carried out, and important characteristic parameters in the deflagration and detonation flame propagation process of the hydrogen-doped natural gas can be recorded.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of combustible gas explosion safety, and particularly relates to an experimental device and experimental method for explosion characteristics of hydrogen-mixed natural gas in a confined space. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] Hydrogen is mixed into natural gas at a certain ratio, and the existing natural gas pipeline or pipe network is used for transportation, which is a current way to realize large-scale hydrogen transportation. However, hydrogen and natural gas have very different physical and chemical properties, and after adding hydrogen, the physical and chemical properties of the mixed gas will change greatly.

[0004] When hydrogen-mixed natural gas leaks into a confined space such as a comprehensive pipe gallery, due to the high diffusivity of hydrogen, a dangerous flammable mixture can be quickly formed, and it is more likely to explode than other gases. The pressure wave produced by the explosion cannot be released and reflects back and forth in the confined space, resulting in a substantial increase in pressure and pressure growth rate. In the confined space, there are some obstacles of different shapes on the flame propagation path. When the flame encounters obstacles on the propagation path, the turbulent flame will have complex interactions with the obstacles, and will cause a transition from deflagration to detonation, causing more serious consequences.

[0005] The inventor found that there is currently less research on the leakage, combustion and explosion characteristics and evolution rules of natural gas with different hydrogen mixing ratios, and there is a lack of an experimental device specifically for studying the explosion characteristics of hydrogen-mixed natural gas in a confined space. SUMMARY

[0006] In order to solve the above problems, the purpose of the present application is to provide an experimental device and experimental method for explosion characteristics of hydrogen-mixed natural gas in a confined space.

[0007] Based on the above purpose, the first aspect of the present application provides an experimental device for explosion characteristics of hydrogen-mixed natural gas in a confined space, comprising a pipeline system and a gas distribution system, the pipeline system comprising a driving pipe, a visible pipe and a test pipe connected in sequence, the gas distribution system comprising a vacuum pump, an electric control valve group and a gas cylinder pipeline connected with each electric control valve in the electric control valve group, the gas distribution system being connected with the driving pipe through a gas inlet.

[0008] Further technical solutions, the pipeline system is a horizontal straight pipe with a square cross section.

[0009] Further technical solutions, the driving pipe is internally provided with a hole plate obstacle, the hole plate obstacle comprises a plurality of square hole plates with central square holes, the square hole plates are connected by a screw rod and a nut, the square hole plates are detachable and the distance between each square hole plate is adjustable.

[0010] Further technical solutions, one end of the test pipe not connected with the visual pipe is sealed by a film; the film is preferably a polytetrafluoroethylene film.

[0011] Further technical solutions, the test pipe is internally provided with a smoking film.

[0012] Further technical solutions, the gas cylinder pipeline comprises a methane gas cylinder pipeline, a hydrogen gas cylinder pipeline, a mixed gas cylinder pipeline, an air cylinder pipeline, a nitrogen gas cylinder pipeline and an inert gas cylinder pipeline, and a pressure sensor is arranged on each gas cylinder pipeline.

[0013] Further technical solutions, further comprise an ignition system, the ignition system comprises an adjustable igniter and an ignition electrode, the adjustable igniter is connected with the ignition electrode, the ignition electrode is arranged in the inside of the left end face of the driving pipe, the ignition position of the ignition electrode is on the center line of the driving pipe, and the distance between the ignition electrode and the left end face of the driving pipe is adjustable.

[0014] Further technical solutions, further comprise a collection system, the collection system comprises an image collection system and a data collection system.

[0015] The image collection system comprises a high-speed camera, and the high-speed camera collects image information through a transparent window arranged on the visual pipe.

[0016] The data collection system comprises a high-frequency pressure sensor, a flame sensor and a data collection instrument, and the data collection instrument is connected with the high-frequency pressure sensor and the flame sensor.

[0017] Threaded interfaces are symmetrically arranged on the upper and lower wall faces of the driving pipe, the visual pipe and the test pipe, and are used for symmetrically mounting the high-frequency pressure sensor and the flame sensor.

[0018] Further technical solutions, further comprise a control system, the control system comprises a synchronous controller, a computer and a programmable controller, and is used for realizing synchronous control of ignition, image collection and data collection and process control and pressure display during gas distribution in experiments.

[0019] In the second aspect of the application, a method for testing explosion characteristics of hydrogen-doped natural gas in a confined space is provided, and the method is based on the above-mentioned experimental device for testing explosion characteristics of hydrogen-doped natural gas in a confined space and comprises the following steps.

[0020] The required premixed gas is configured by the gas distribution system; the premixed gas is filled into the pipeline, and when the pressure in the pipeline reaches the set pressure, the gas inlet is closed.

[0021] The gas is allowed to stand for a set time, so that the gas reaches a static state and is uniformly mixed;

[0022] The adjustable igniter is turned on, the output voltage is raised to the preset ignition voltage, then the data acquisition instrument, the synchronous controller and the high-speed camera are turned on and are in a waiting state, after preparation is completed, the synchronous controller is started, the adjustable igniter, the high-speed camera and the data acquisition instrument are triggered in turn according to the preset time, and various data in the flame propagation process are dynamically measured.

[0023] Further technical solutions, the required premixed combustible gas is configured through the gas distribution system, specifically:

[0024] The proportion parameter is set, the target proportion of the combustible mixed gas is configured by using the voltage division method, the proportion control of the mixed gas is realized by controlling the opening and closing of the electric control valve, and the combustible gas and the combustion-supporting gas are uniformly mixed into the mixed gas cylinder at the target equivalence ratio and the hydrogen mixing ratio.

[0025] Compared with the prior art, the beneficial effects of the present application are:

[0026] 1. The present application can carry out hydrogen-doped natural gas explosion accident characteristic evolution and inhibition experiments with different hydrogen proportions, and can record important characteristic parameters in the deflagration and detonation flame propagation process of hydrogen-doped natural gas;

[0027] 2. The obstacle system in the present application can realize the combination of different blockage ratios, spacings and quantities, and study the influence of multiple factors on the explosion characteristics of hydrogen-doped natural gas in a confined space;

[0028] 3. The present application uses the symmetrical arrangement of pressure sensors and flame sensors to measure the pressure dynamic rising characteristics and flame signal related parameters in the pipeline, and can analyze the mutual relationship between the pressure and the flame characteristics in the pipeline by combining high-speed camera images. Using the device, many studies on hydrogen-doped natural gas explosion flame propagation and pressure rising characteristics and explosion inhibition can be carried out, for example, the influence of equivalence ratio, ignition position, ignition energy, initial pressure, obstacles and other factors can be studied respectively, and inert gas can be added to the premixed gas to study its influence on flame propagation dynamics.

[0029] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are used for explanation. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings accompanying the specification of the present application form a part of the present application, and are used to provide a further understanding of the present application, the schematic embodiments of the present application and the explanations thereof are used to explain the present application, and do not constitute an improper limitation on the present application.

[0031] Figure 1 is a schematic diagram of the hydrogen-doped natural gas explosion characteristic experiment device in a confined space of the present application;

[0032] Figure 2 is a schematic diagram of the orifice barrier in the present application;

[0033] Figure 3 is a schematic diagram of the gas distribution system structure of the present application.

[0034] Among them, 1-adjustable igniter, 2-synchronous controller, 3-high-speed camera, 4-data acquisition instrument, 5-driving pipe, 6-high-frequency pressure sensor, 7-ignition electrode, 8-computer, 9-gas distribution system, 10-polytetrafluoroethylene film, 11-flame sensor, 12-visual pipe, 13-test pipe, 14-orifice barrier, 15-vacuum pump, 16-electrically controlled valve group, 17-pressure sensor, 18-flame arrester, 19-one-way valve, 20-pressure reducing valve, 21-gas cylinder valve, 22-methane gas cylinder, 23-hydrogen gas cylinder, 24-mixed gas cylinder, 25-air cylinder, 26-nitrogen cylinder, 27-inert gas cylinder. DETAILED DESCRIPTION

[0035] The present application will be further described below in combination with the drawings and examples.

[0036] The present application proposes a hydrogen-doped natural gas explosion characteristic experiment device and experiment method in a confined space to test the flame propagation and overpressure characteristics of hydrogen-doped natural gas with different hydrogen proportions in a confined space, and to test the explosion inhibition effect of different types of inert gases on hydrogen-doped natural gas, aiming at the demand for studying the accident characteristics and evolution law of leakage, combustion and explosion of hydrogen-doped natural gas with different hydrogen proportions.

[0037] Example 1

[0038] As shown in Figure 1 , the present embodiment provides a hydrogen-doped natural gas explosion characteristic experiment device in a confined space, which comprises a pipeline system and a gas distribution system 9, the pipeline system comprises driving pipe 5, visual pipe 12 and test pipe 13 connected in sequence, the gas distribution system 9 comprises vacuum pump 15, electrically controlled valve group 16 and gas cylinder pipeline connected with each electrically controlled valve in the electrically controlled valve group, and the gas distribution system is connected with the driving pipe 5 through the gas inlet.

[0039] The pipeline system comprises driving pipe 5, visual pipe 12 and test pipe 13, which are all horizontally placed straight pipes with square cross sections. The driving pipe 5 is made of stainless steel plate on each wall surface, and the orifice barrier 14 composed of continuous orifice plate structure is built-in.

[0040] The present embodiment adopts square pipes to shoot and analyze the flame propagation process, which is not easy to deform compared with conventional round pipes, and the shooting effect is better.

[0041] As shown in Figure 2 The orifice plate obstacle 14 is composed of several square plates with central square holes, 4 screw rods and several nuts. The square hole plates are connected by the screw rods and nuts. The hole plates are detachable and the distance between the hole plates can be adjusted to achieve different blockage ratios, distances and quantities.

[0042] The internal structure of the driving tube section can be removed or replaced as needed. The left end face of the driving tube is closed with a metal end cap, and an ignition electrode 7 is installed on it. An air inlet is installed nearby to evacuate the tube to a vacuum state and fill the premixed gas into the tube. The air inlet is connected to a vacuum gauge to observe the gas pressure in the tube during gas distribution. The other end of the driving tube is connected to the test tube by a flange. The function of this section is to achieve spark ignition and, if necessary, to install obstacles to accelerate the deflagration to detonation process of hydrogen-doped natural gas.

[0043] The upper and lower walls of the visible tube are made of stainless steel, and the front and rear walls are made of transparent organic glass. A high-speed camera can be used to record and observe the deflagration and detonation flame evolution in the tube. The visible tube has flanges at both ends to connect to other experimental tube sections.

[0044] The test tube is made of stainless steel plate with a built-in smoke film to record the detonation cell structure. The right end face of the test tube is sealed with a polytetrafluoroethylene film 10. When the pressure reaches a certain level, the film breaks, releasing the pressure in the tube and ensuring the safety of the experiment.

[0045] The overall length of the pipeline system can be freely adjusted, and the visible tube can be freely combined to form various combinations and lengths to observe the entire deflagration to detonation process and meet the specific needs of the experiment. Each part of the pipeline (driving tube, visible tube, test tube) is connected by flanges to form a fixed length unit. By adjusting the number of units, the length of each section of the pipeline can be controlled to achieve free combination. The free combination of length refers to the use of a single or multiple visible sections to capture and analyze the entire detonation process. During the experiment, the specific location of detonation can be determined by the pressure change in the tube, and then the position of the visible section can be changed.

[0046] Hydrogen-doped natural gas is a mixture of methane and hydrogen. Compared with single combustible gas explosion experiments, the location of hydrogen-doped detonation is uncertain, so a test section with adjustable observation section position needs to be designed.

[0047] The entire pipeline system is placed on a stainless steel support with a certain height, and the bottom has standard threaded holes for fixing the support.

[0048] The gas distribution system 9 is connected to the driving tube 5 through the air inlet. An electric control valve is installed at the air inlet to control the on-off of the gas distribution system and the driving tube 5. Figure 3As shown, the gas distribution system 9 includes a vacuum pump 15, an electrically controlled valve group 16, and a gas cylinder pipeline connected to each electrically controlled valve in the electrically controlled valve group 16, wherein the vacuum pump 15 is switched on and off by the electrically controlled valve.

[0049] The gas cylinder pipeline includes a methane gas cylinder pipeline, a hydrogen gas cylinder pipeline, a mixed gas cylinder pipeline, an air cylinder pipeline, a nitrogen gas cylinder pipeline, and an inert gas cylinder pipeline, and a pressure sensor 17 is arranged on each gas cylinder pipeline.

[0050] Specifically, the methane gas cylinder pipeline includes a methane gas cylinder 22, a cylinder valve 21, a pressure reducing valve 20, a one-way valve 19, and a flame arrester 18 connected in sequence; the hydrogen gas cylinder pipeline includes a hydrogen gas cylinder 23, a cylinder valve 21, a pressure reducing valve 20, a one-way valve 19, and a flame arrester 18 connected in sequence; the mixed gas cylinder pipeline includes a mixed gas cylinder 24, a cylinder valve 21, and a flame arrester 18 connected in sequence; the air cylinder pipeline includes an air cylinder 25, a cylinder valve 21, a pressure reducing valve 20, and a one-way valve 19 connected in sequence; the nitrogen gas cylinder pipeline includes a nitrogen gas cylinder 26, a cylinder valve 21, a pressure reducing valve 20, and a one-way valve 19 connected in sequence; and the inert gas cylinder pipeline includes an inert gas cylinder 27, a cylinder valve 21, a pressure reducing valve 20, and a one-way valve 19 connected in sequence.

[0051] The inert gas cylinder is added in the device, and the content and type of the added inert gas can be changed to study the influence of the inert gas on the explosion characteristics of the hydrogen-doped natural gas.

[0052] The experimental device further includes an ignition system including an adjustable igniter 1 and an ignition electrode 7, the adjustable igniter is connected to the ignition electrode, remote ignition can be achieved, and the ignition time and ignition energy are adjustable. The ignition electrode 7 is arranged at the inside of the left end surface of the driver tube and is used to ignite the premixed gas. The ignition position of the ignition electrode is on the center line of the driver tube, and the distance from the left end surface is 50-100 mm. According to the experimental requirements, the distance of the ignition electrode extending out of the left end surface of the driver tube along the center line can be adjusted to change the ignition position, so as to study the characteristics and rules of the transition from deflagration to detonation of the hydrogen-doped natural gas under different ignition energies and ignition positions.

[0053] The experimental device further includes a collection system including an image collection system and a data collection system. The image collection system includes a high-speed camera 3, and the image information is collected through a transparent window (transparent organic glass) arranged on the visual tube 12; the data collection system includes a high-frequency pressure sensor 6, a flame sensor 11, and a data collection instrument 4, and the data collection instrument is connected to the high-frequency pressure sensor and the flame sensor;

[0054] The upper and lower walls of the driver tube, the visual tube, and the test tube are symmetrically provided with threaded interfaces for symmetrically mounting the high-frequency pressure sensor and the flame sensor, so as to measure the pressure and light signals of the deflagration flame and the detonation wave and investigate the propagation of the combustion pressure wave and the detonation shock wave.

[0055] The experimental device further comprises a control system, which comprises a synchronous controller 2, a computer 8, a programmable controller PLC, and is used for realizing synchronous control of ignition, image acquisition and data acquisition, process control and pressure display during gas distribution in the experiment, real-time acquisition and display of control process pressure parameters, and storage in an ODBC database for viewing and analysis. During the experiment, the adjustable igniter 1, the high-speed camera 3 and the data acquisition instrument 4 are all synchronously controlled by the synchronous controller 2. The computer is used for program-controlled ignition, and the PLC system is used for controlling the ignition time, adjusting the released energy, and adjusting the accuracy to be not less than 20 ms.

[0056] The experimental device provided in the embodiment can be used for: (1) studying the influence of different factors on the deflagration characteristics of hydrogen-doped natural gas, mainly studying the influence of hydrogen proportion, initial pressure and ignition energy on pressure, flame structure, propagation speed and deflagration acceleration distance in the deflagration process; (2) studying the influence of different obstacle blockage ratios, obstacle structures and spacings on the propagation characteristics of the detonation wave, recording the development process of the detonation on the pipe wall by using the smoke film technology, and shooting and analyzing the propagation process of the detonation wave in the pipe by using the optical system; (3) studying the suppression of hydrogen-doped natural gas explosion, changing the types and contents of inert gases, studying the influence of the inert gases on the flame propagation characteristics of hydrogen-doped natural gas, and analyzing the flame structure evolution process, flame propagation speed and deflagration pressure and other characteristic parameters.

[0057] Embodiment 2

[0058] Based on the experimental device in Embodiment 1, the embodiment provides an experimental method for performing an experiment on the explosion characteristics of hydrogen-doped natural gas in a confined space by using the experimental device, comprising the following steps.

[0059] (1) Install and debug the experimental device, ensure that the gas distribution system, high-speed camera system, pressure sensor, flame sensor, data acquisition instrument and synchronous controller are in good condition, perform vacuumization on the explosion pipeline before gas charging, ensure that the pipeline has good airtightness, install the orifice plate obstacle system on the driven pipe when studying the influence of obstacles on the flame propagation dynamics, and install the smoke film on the test pipe when studying the detonation characteristics;

[0060] (2) Configure the required ratio of combustible premixed gas by using the gas distribution system, and add a certain ratio of inert gas when studying gas protection, charge the gas into the experimental pipeline, and close the inlet valve at the gas inlet when the pressure in the pipeline reaches the set pressure;

[0061] (3) Let the gas stand for not less than 20 minutes, so that the gas reaches a stationary state and is uniformly mixed;

[0062] (4) Turn on the adjustable igniter, and make its output voltage rise to the preset ignition voltage, then turn on the data acquisition instrument, the synchronization controller and the high-speed camera and make them in the waiting state, after the preparation is completed, start the synchronization controller, make the igniter, the camera and the data acquisition instrument trigger in turn according to the preset time, and dynamically measure various data in the flame propagation process; in addition, the igniter can also set a delay time according to actual needs, and trigger the high-speed camera and the data acquisition synchronously when the time ends;

[0063] (5) After one experiment is completed, store the image data of the high-speed camera and the pressure and flame signal data recorded by the data acquisition instrument, and then enter the next experiment procedure.

[0064] Hydrogen-doped natural gas is a mixed gas of methane and hydrogen. Compared with the explosion experiment method of single combustible gas, a special high-precision automatic gas filling system needs to be designed to ensure that mixed gas with different hydrogen-doping ratios can be obtained.

[0065] The gas is filled by the partial pressure method. In the experiment, the equivalence ratio φ of the mixed gas and the hydrogen-doping ratio are defined as follows:

[0066]

[0067]

[0068] In the formula, m fuel and m air are the mass of fuel and air respectively, stioch is the value of each parameter under the condition of stoichiometric equivalence ratio, represents the molar mass of O2, N2, CH4 and H2 respectively, is the volume of hydrogen filled, is the volume of methane filled.

[0069] The hydrogen-doping ratio is the volume ratio of hydrogen in hydrogen-doped natural gas. When the hydrogen-doping ratio is changed, the amount of air added needs to be changed in order to keep the equivalence ratio of the mixed gas unchanged. The volume fractions of hydrogen, methane and air in the mixed gas can be obtained by calculation.

[0070] The gas filling system uses the partial pressure method to configure the target proportion of combustible mixed gas. The proportion of the mixed gas is directly controlled by the computer through the electric control valve. Before gas filling, the computer control is used to realize the vacuum operation of the gas filling pipeline and the experimental pipeline; the proportion parameters in the computer software are set, and the combustible gas and the combustion-supporting gas (air in this embodiment) are delivered into the premixed gas bottle at the target equivalence ratio and hydrogen-doping ratio for uniform mixing; then the gas filling pipeline is connected with the driving pipe inlet valve, and after the gas filling is completed, the computer control is used to control the nitrogen cylinder electric control valve to realize the purging of the gas filling pipeline.

[0071] The mixed gas is configured by a premixed gas cylinder, and each type of gas is directly introduced into the pipeline through a gas distribution system, and after each time of introduction, uniform mixing is carried out, and after uniform mixing, multiple experiments can be conveniently and quickly carried out, and the operation is more convenient and simple, and high-precision gas distribution can be realized.

[0072] Since the hydrogen-doped natural gas hydrogen-doped detonation position is uncertain, the observation section position needs to be adjusted to observe the complete explosion process, the premixed gas cylinder is configured to mix the gas, the gas conditions of multiple experiments can be ensured to be the same, and the experimental precision is improved. In addition, the influence of different factors on the deflagration characteristics of hydrogen-doped natural gas can be quickly and conveniently realized.

[0073] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0074] Although the specific embodiments of the present application are described above in combination with the drawings, it is not a limitation on the protection scope of the present application, and those skilled in the art should understand that various modifications or changes made on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A device for testing the explosion characteristics of hydrogen-doped natural gas in a confined space, characterized by, The pipeline system comprises a driving pipe, a visual pipe and a test pipe connected in sequence, and the gas distribution system comprises a vacuum pump, an electrically controlled valve group and a gas cylinder pipeline connected with each electrically controlled valve in the valve group, and the gas distribution system is connected with the driving pipe through an air inlet; The driving pipe is internally provided with a perforated plate obstacle, which comprises a plurality of square hole plates with central square holes, and the square hole plates are connected in series through screws and nuts, and the square hole plates are detachable and the distance between each square hole plate is adjustable; The combustible mixed gas with a target proportion is configured by using a partial pressure method, and the proportion control of the mixed gas is realized by controlling the opening and closing of the electrically controlled valve; the combustible gas and the combustion-supporting gas are delivered into the mixed gas cylinder at a target equivalence ratio and a hydrogen mixing ratio for uniform mixing; The collection system comprises an image collection system and a data collection system; The image collection system comprises a high-speed camera, which collects image information through a transparent window arranged on the visual pipe; the data collection system comprises a high-frequency pressure sensor, a flame sensor and a data collection instrument, and the data collection instrument is connected with the high-frequency pressure sensor and the flame sensor; screw threads are symmetrically arranged on the upper and lower walls of the driving pipe, the visual pipe and the test pipe, and are used for symmetrically mounting the high-frequency pressure sensor and the flame sensor; The pipeline system is a straight pipe with a square cross section and is horizontally placed; The right end surface of the test pipe is sealed by a thin film, and the thin film is a polytetrafluoroethylene film; A smoking thin film is arranged in the test pipe.

2. The apparatus for experiment of explosion characteristics of hydrogen-doped natural gas in a confined space according to claim 1, characterized in that, The gas cylinder pipeline comprises a methane gas cylinder pipeline, a hydrogen gas cylinder pipeline, a mixed gas cylinder pipeline, an air cylinder pipeline, a nitrogen gas cylinder pipeline and an inert gas cylinder pipeline, and a pressure sensor is arranged on each gas cylinder pipeline.

3. The apparatus for experiment of explosion characteristics of hydrogen-doped natural gas in a confined space according to claim 1, characterized in that, The ignition system comprises an adjustable igniter and an ignition electrode, the adjustable igniter is connected with the ignition electrode, the ignition electrode is arranged in the inside of the left end surface of the driving pipe, the ignition position of the ignition electrode is on the center line of the driving pipe, and the distance between the ignition electrode and the left end surface of the driving pipe is adjustable.

4. The apparatus for experiment of explosion characteristics of hydrogen mixed natural gas in a confined space according to claim 1, characterized in that, The control system comprises a synchronous controller, a computer and a programmable controller, and is used for realizing the synchronous control of ignition, image collection and data collection, the process control during gas distribution and pressure display.

5. A method for experiment of explosion characteristics of hydrogen-mixed natural gas in a confined space, based on the experimental device for experiment of explosion characteristics of hydrogen-mixed natural gas in a confined space according to any one of claims 1-4, characterized in that, The method comprises the following steps: The combustible premixed gas with a required proportion is configured by using the gas distribution system; the premixed gas is filled into the pipeline, and when the pressure in the pipeline reaches a set pressure, the air inlet is closed; The gas is statically placed for a set time, so that the gas reaches a static state and is uniformly mixed; The adjustable igniter is turned on, so that the output voltage rises to a preset ignition voltage, then the data collection instrument, the synchronous controller and the high-speed camera are turned on and are in a waiting state, after preparation is completed, the synchronous controller is started, so that the adjustable igniter, the high-speed camera and the data collection instrument are triggered in sequence according to a preset time, and various data in the flame propagation process are dynamically measured.

6. The method for experimentally determining the explosion characteristics of hydrogen-doped natural gas in a confined space according to claim 5, characterized in that, The combustible premixed gas with a required proportion is configured by using the gas distribution system, and specifically, The proportion parameter is set, the combustible mixed gas with the target proportion is configured by using the partial pressure method, and the proportion control of the mixed gas is realized by controlling the opening and closing of the electric control valve; the combustible gas and the combustion-supporting gas are delivered into the mixed gas cylinder in the target equivalence ratio and the hydrogen mixing ratio for uniform mixing.

Images