Natural gas ignition method and system in full-scale gas blasting test

Abstract

The present invention provides a method and system for igniting natural gas in a full-scale gas explosion test. The ignition method includes the following steps: determining the positions and angles of a plurality of igniter cartridge launching devices relative to the explosion test pipeline according to the static model of natural gas explosion and the mass of natural gas in the explosion test pipeline; determining the time for the plurality of igniter cartridge launching devices to launch igniter cartridges and the specifications of the igniter cartridges; the plurality of igniter cartridge launching devices launch the corresponding-specification igniter cartridges according to the determined time for launching the igniter cartridges, and ignite the natural gas escaping from the explosion test pipeline. Among them, the plurality of igniter cartridge launching devices are arranged near the explosion test pipeline according to the determined positions and angles. The present invention quantitatively calculates the height and diameter of the natural gas and air mixed vapor cloud, so as to determine the height, angle and time of igniter cartridge launching, making the entire ignition process safe and controllable, and significantly reducing the environmental pollution of natural gas and the uncontrollable explosion risk during the test.

Description

Technical Field

[0001] The present invention belongs to the technical field of full-scale gas explosion tests for natural gas transmission pipelines, and particularly relates to a method and system for igniting natural gas in full-scale gas explosion tests. Background Art

[0002] After a natural gas pipeline leaks, due to the high pressure inside the pipe, a large amount of gas escapes from the leakage point, which can cause crack propagation at the leakage point and pipeline fracture, leading to accidents. The full-scale gas explosion test of a natural gas pipeline is used to simulate an actual in-service pipeline and study the fracture toughness index of steel pipes and the explosion hazard range. During the test, after a crack is introduced into the pipeline, the pipeline fractures under the action of the internal pressure of the pipe, and the natural gas expands rapidly, forming a violent physical explosion, generating strong shock waves and seismic waves. Subsequently, the natural gas quickly rises into the air, mixes with the air, and aggregates into a combustible mixed vapor cloud.

[0003] The main component of natural gas is methane, which is a flammable gas. Directly discharging it has a relatively high risk. The commonly adopted method is to ignite it, converting it into water and carbon dioxide to reduce air pollution. In addition, due to the large amount of combustible gas in the aggregated mixed vapor cloud, ignition is extremely likely to occur, resulting in an uncontrollable vapor cloud explosion, forming a violent chemical explosion and bringing relatively high risks.

[0004] When natural gas just leaks out from the pipeline crack, due to the high concentration of methane and low oxygen concentration, it does not reach its ignition mixing concentration and cannot be ignited. When the natural gas mass rises to a certain height, it can mix with the air to a certain extent and reach the ignition concentration (the edge of the vapor cloud mixes fully and evenly with the air and is easy to ignite). Igniting at this time results in sufficient combustion and causes less environmental pollution and risk. Summary of the Invention

[0005] In view of the above problems, the present invention provides a method and system for igniting natural gas in a full-scale gas explosion test, which is applicable to the ignition treatment of natural gas in the full-scale gas explosion test of a natural gas pipeline.

[0006] The present invention provides a method for igniting natural gas in a full-scale gas explosion test, including the following steps:

[0007] Determine the positions and angles of a plurality of ignition cartridge launching devices relative to the blasting test pipeline according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline;

[0008] Determine the time for a plurality of ignition cartridge launching devices to launch ignition cartridges and the specifications of the ignition cartridges;

[0009] Multiple igniter launching devices launch igniters of corresponding specifications at the determined time for launching igniters, and ignite the natural gas escaping from the blasting test pipeline. Among them, the multiple igniter launching devices are arranged near the blasting test pipeline at the determined positions and angles.

[0010] Further, determining the positions and angles of the multiple igniter launching devices relative to the blasting test pipeline according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline includes the following steps:

[0011] When the natural gas reaches the ignition concentration, determine the diameter of the mixed vapor cloud according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline;

[0012] Determine the height of the mixed vapor cloud according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline;

[0013] Determine the positions and angles of the multiple igniter launching devices relative to the blasting test pipeline according to the height and diameter of the mixed vapor cloud.

[0014] Further, determining the positions and angles of the multiple igniter launching devices relative to the blasting test pipeline according to the height and diameter of the mixed vapor cloud includes:

[0015] Construct a positioning model for the igniter launching device according to the height and diameter of the mixed vapor cloud;

[0016] Determine the positions of the igniter launching devices relative to the blasting test pipeline and the angles of the multiple igniter launching devices in the igniter launching device positioning model.

[0017] Further, determining the time for the multiple igniter launching devices to launch igniters and the specifications of the igniters includes the following steps:

[0018] Calculate the time required for the natural gas escaping from the blasting test pipeline to rise to the height of the mixed vapor cloud;

[0019] Determine the time for the igniter launching devices at different setting points to launch igniters according to the initial velocity of the igniters and the flight distances of the igniters launched by different igniter launching devices.

[0020] Further, the natural gas ignition method further includes the step: calculating the mass of natural gas in the blasting test pipeline according to the specification parameters of the blasting test pipeline, specifically:

[0021] Calculate the volume of natural gas in the blasting test pipeline according to the specification parameters of the blasting test pipeline;

[0022] Calculate the mass of natural gas in the blasting test pipeline according to the density of natural gas and the volume of natural gas in the blasting test pipeline.

[0023] Further, the static model of natural gas explosion is as follows:

[0024] D = 5.8 * m 1 / 3 (1);

[0025] H = 4.35 * m 1 / 3 (2);

[0026] Wherein, D is the diameter of the vapor cloud, H is the distance between the center of the vapor cloud sphere and the ground when reaching the ignition concentration, and m is the mass of natural gas.

[0027] Further, the positioning model of the ignition bomb launching device is constructed according to the height and diameter of the mixed vapor cloud, specifically as follows:

[0028] Define the mixed vapor cloud as a circle with a diameter of D, the center point of the circle is O, define the height of the mixed vapor cloud as the straight line OA passing through the center O of the circle, point A is the position point of the blasting test pipeline, draw a straight line AB perpendicular to the straight line OA from point A, draw a straight line OE parallel to the straight line AB from point O, and the straight line OE intersects the circle at point C.

[0029] Further, in the positioning model of the ignition bomb launching device, determine the position of the ignition bomb launching device relative to the blasting test pipeline and the angles of multiple ignition bomb launching devices, specifically as follows:

[0030] Draw a straight line CA1 perpendicular to the straight line AB from point C, A1 is the intersection point of the straight line AB and the straight line CA1, and A1 is the first setting point of the ignition bomb launching device. Referring to the first setting point A1, determine the setting points of other ignition bomb launching devices at certain intervals in the direction of the straight line A1B;

[0031] The angles formed by the connecting lines of multiple ignition bomb launching device setting points to point C and the straight line AB are the angles of multiple ignition bomb launching devices, and the length of the connecting line from the ignition bomb launching device setting point to point C is the flight distance of the ignition bomb.

[0032] The present invention also provides a natural gas ignition system in a full-scale gas blasting test, including:

[0033] The first calculation module is used to determine the positions and angles of multiple ignition bomb launching devices relative to the blasting test pipeline according to the static model of natural gas explosion and the mass of natural gas;

[0034] The second calculation module is used to determine the time for multiple ignition bomb launching devices to launch ignition bombs and the specifications of the ignition bombs;

[0035] Multiple ignition bomb launching devices are used to launch corresponding specification ignition bombs at the determined time of launching ignition bombs, and ignite the natural gas escaping from the blasting test pipeline. Among them, multiple ignition bomb launching devices are arranged near the blasting test pipeline according to the determined positions and angles.

[0036] Further, the first calculation module is specifically configured to:

[0037] When the natural gas reaches the ignition concentration, determine the diameter of the mixed vapor cloud according to the static natural gas explosion model and the mass of natural gas in the blasting test pipeline; determine the height of the mixed vapor cloud according to the static natural gas explosion model and the mass of natural gas in the blasting test pipeline; determine the positions and angles of multiple ignition bomb launching devices relative to the blasting test pipeline according to the height and diameter of the mixed vapor cloud.

[0038] Further, the second calculation module is specifically configured to:

[0039] Calculate the time required for the natural gas escaping from the blasting test pipeline to rise to the height of the mixed vapor cloud; determine the time for the ignition bomb launching device at different setting points to launch the ignition bomb according to the initial velocity of the ignition bomb and the flight distance of the ignition bombs launched by different ignition bomb launching devices.

[0040] Further, the natural gas ignition system further includes:

[0041] A third calculation module, configured to calculate the mass of natural gas in the blasting test pipeline according to the specification parameters of the blasting test pipeline, specifically:

[0042] Calculate the volume of natural gas in the blasting test pipeline according to the specification parameters of the blasting test pipeline; calculate the mass of natural gas in the blasting test pipeline according to the density of natural gas and the volume of natural gas in the blasting test pipeline.

[0043] Advantages of the present invention: The present invention quantitatively calculates the height and diameter of the mixed vapor cloud of natural gas and air, thereby determining the height, angle and time of ignition bomb launching, making the entire ignition process safe and controllable, and significantly reducing the environmental pollution of natural gas and the uncontrollable explosion risk during the test.

[0044] Other features and advantages of the present invention will be described in the subsequent description, and, in part, will be obvious from the description, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1The flowchart of a natural gas ignition method in a full-scale gas blasting test according to an embodiment of the present invention is shown;

[0047] Figure 2 The schematic diagram of the positioning model of the ignition cartridge launching device according to an embodiment of the present invention is shown;

[0048] Figure 3 The structural schematic diagram of a natural gas ignition system in a full-scale gas blasting test according to an embodiment of the present invention is shown. Specific embodiments

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0050] It should be noted that the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0051] To reduce the environmental pollution of natural gas and the uncontrollable explosion risk during the full-scale gas blasting test of natural gas pipelines, the present invention provides a natural gas ignition method in a full-scale gas blasting test.

[0052] Please refer to Figure 1 , Figure 1 The flowchart of a natural gas ignition method in a full-scale gas blasting test according to an embodiment of the present invention is shown.

[0053] A natural gas ignition method in a full-scale gas blasting test includes the following steps: determining the positions and angles of multiple ignition cartridge launching devices relative to the blasting test pipeline according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline; determining the time for the multiple ignition cartridge launching devices to launch ignition cartridges and the specifications of the ignition cartridges; the multiple ignition cartridge launching devices launch the corresponding specification ignition cartridges according to the determined time for launching ignition cartridges, and ignite the natural gas escaping from the blasting test pipeline, wherein the multiple ignition cartridge launching devices are arranged near the blasting test pipeline according to the determined positions and angles.

[0054] The embodiments of the present invention can determine the layout points, angles of the ignition cartridge launching devices, and the time for launching ignition cartridges, making the entire ignition process safe and controllable, significantly reducing the environmental pollution of natural gas and the uncontrollable explosion risk during the test, and having good application value.

[0055] Furthermore, the natural gas ignition method further includes the following steps:

[0056] Calculate the mass of natural gas in the blasting test pipeline based on the specification parameters of the blasting test pipeline.

[0057] Specifically, obtaining the mass of natural gas in the blasting test pipeline includes the following steps:

[0058] S11. Calculate the volume of natural gas in the blasting test pipeline based on the specification parameters of the blasting test pipeline.

[0059] It should be noted that the specification parameters of the blasting test pipeline include the inner diameter of the pipeline, the pressure of natural gas in the pipeline, and the length of the pipeline.

[0060] S12. Calculate the mass of natural gas in the blasting test pipeline according to the density of natural gas and the volume of natural gas in the blasting test pipeline.

[0061] In specific implementation, the test pipeline is an X80 steel pipe with an outer diameter of 1422 mm and a wall thickness of 18.4 mm. The pressure of natural gas in the pipeline is 12 MPa, the length of the pipeline blasting cracking section is 40 meters, and the temperature is 20 °C. Through calculation, the volume of natural gas in the pipeline can be obtained as 60.32 cubic meters, and then the mass of natural gas in the pipeline can be calculated as 50668.8 kg.

[0062] Specifically, the static model of natural gas explosion is:

[0063] D = 5.8 * m 1 / 3 (1);

[0064] H = 4.35 * m 1 / 3 (2);

[0065] In the formula, D is the diameter of the vapor cloud, H is the distance between the center of the vapor cloud sphere and the ground when reaching the ignition concentration, and m is the mass of natural gas.

[0066] Specifically, determining the positions and angles of multiple ignition cartridge launching devices relative to the blasting test pipeline according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline includes the following steps:

[0067] S21. When the natural gas reaches the ignition concentration, determine the diameter of the mixed vapor cloud according to Equation (1) in the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline.

[0068] S22. Determine the height of the mixed vapor cloud according to Equation (2) in the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline.

[0069] S23. Determine the positions and angles of multiple ignition bomb launching devices relative to the blasting test pipeline according to the height and diameter of the mixed vapor cloud.

[0070] During specific implementation, according to the mass of natural gas in the pipeline, which is 50,668.8 kg, the diameter of the mixed vapor cloud is calculated to be 214.6 m and the height is 161 m respectively through formulas (1) and (2).

[0071] Specifically, determining the positions and angles of multiple ignition bomb launching devices relative to the blasting test pipeline includes:

[0072] S31. Construct a positioning model for the ignition bomb launching device according to the height and diameter of the mixed vapor cloud. Please refer to Figure 2 , Figure 2 which shows a schematic diagram of the positioning model for the ignition bomb launching device according to an embodiment of the present invention.

[0073] Among them, the mixed vapor cloud is defined as a circle with a diameter of D, the center point of the circle is O, the height of the mixed vapor cloud is defined as a straight line OA passing through the center O, point A is the position of the blasting test pipeline, a straight line AB perpendicular to the straight line OA is made from point A, and a straight line OE parallel to the straight line AB is made from point O. The straight line OE intersects the circle at point C.

[0074] S32. Determine the position of the ignition bomb launching device relative to the blasting test pipeline in the positioning model for the ignition bomb launching device. Among them, a straight line CA1 perpendicular to the straight line AB is made from point C, A1 is the intersection point of the straight line AB and the straight line CA1, and A1 is the first setting point of the ignition bomb launching device. Referring to the first setting point A1, other setting points of the ignition bomb launching device are sequentially determined at a certain interval in the direction of the straight line A1B.

[0075] Specifically, the distance between the first setting point A1 and the position A of the blasting test pipeline is A1A = 1 / 2 * D.

[0076] S33. Determine the angles of multiple ignition bomb launching devices in the positioning model for the ignition bomb launching device. Among them, the included angle formed by the connection lines from the setting points of multiple ignition bomb launching devices to point C and the straight line AB is the angle of multiple ignition bomb launching devices, and the length of the connection line from the setting point of the ignition bomb launching device to point C is the flight distance of the ignition bomb.

[0077] During specific implementation, when determining the setting points of other ignition bomb launching devices, ignition bomb launching device positions A2 and A3 are added at an interval of 50 m in the direction of A1B. Then the distances between the ignition bomb launching device positions A2 and A3 and the position A of the blasting test pipeline are respectively:

[0078] A2A = 1 / 2 * D + 50, A3A = 1 / 2 * D + 100.

[0079] Further confirm the angles of multiple igniter launch devices and the flight distances of the igniters. The angles formed by the connecting lines from the set points A1, A2, and A3 of the igniter launch devices to point C with the straight line AB are respectively:

[0080] ∠a1 = 90°, ∠a2 = 72.7°, ∠a3 = 58°.

[0081] Meanwhile, the flight distances of the igniters launched from the set points A1, A2, and A3 of the igniter launch devices can be obtained as L1 = 161m, L2 = 168.58m, and L3 = 189.5m respectively.

[0082] Specifically, determining the launch time of the igniters by multiple igniter launch devices and the specifications of the igniters includes the following steps:

[0083] S31. Calculate the time required for the natural gas escaping from the blasting test pipeline to rise to the height of the mixed vapor cloud.

[0084] S32. Determine the launch time of the igniters at different set points of the igniter launch devices according to the initial velocity of the igniters and the flight distances of the igniters launched by different igniter launch devices.

[0085] In specific implementation, it is calculated that it takes about 0.5s for the escaping natural gas to rise to 161m. If an igniter with an initial velocity of 100m / s is selected (ignoring air resistance and self-weight), then when the igniter is launched from position A1 and flies to the edge C of the vapor cloud, it takes 1.6s; when the igniter is launched from position A2 and flies to the edge C of the vapor cloud, it takes 1.7s; when the igniter is launched from position A3 and flies to the edge C of the vapor cloud, it takes 1.9s. Therefore, in order to ensure accurate ignition, the launch time of the igniter at position A1 should be at least 2.1s earlier than the detonation moment, the launch time of the igniter at position A2 should be 2.2s earlier than the detonation moment, and the launch time of the igniter at position A3 should be 2.4s earlier than the detonation moment.

[0086] If an igniter with an initial velocity of 50m / s is selected (ignoring air resistance and self-weight), then when the igniter is launched from position A1 and flies to the edge C of the vapor cloud, it takes 3.2s; when the igniter is launched from position A2 and flies to the edge C of the vapor cloud, it takes 3.4s; when the igniter is launched from position A3 and flies to the edge C of the vapor cloud, it takes 3.8s. Therefore, in order to ensure accurate ignition, the launch time of the igniter at position A1 should be at least 3.7s earlier than the detonation moment, the launch time of the igniter at position A2 should be at least 3.9s earlier than the detonation moment, and the launch time of the igniter at position A3 should be at least 4.3s earlier than the detonation moment to ensure ignition.

[0087] In specific implementation, multiple ignition bomb launching devices are arranged near the blasting test pipeline according to the positions and angles determined by the ignition bomb launching device positioning model. Multiple launching device positions are arranged at the points of A1, A2, and A3 respectively, and the type (launching speed) of the ignition bomb is selected and the launching moment is determined according to the calculation results in S32.

[0088] Please refer to Figure 3 , Figure 3 which shows a schematic structural diagram of a natural gas ignition system in a full-scale gas blasting test according to an embodiment of the present invention.

[0089] An embodiment of the present invention further provides a natural gas ignition system in a full-scale gas blasting test, including:

[0090] A first calculation module, configured to determine the positions and angles of multiple ignition bomb launching devices relative to the blasting test pipeline according to the natural gas explosion static model and the natural gas mass;

[0091] A second calculation module, configured to determine the time for multiple ignition bomb launching devices to launch ignition bombs and the specifications of the ignition bombs;

[0092] Multiple ignition bomb launching devices, configured to launch corresponding specification ignition bombs at the determined time for launching ignition bombs to ignite the natural gas escaping from the blasting test pipeline, wherein the multiple ignition bomb launching devices are arranged near the blasting test pipeline according to the determined positions and angles.

[0093] Further, the first calculation module is specifically configured to: when the natural gas reaches the ignition concentration, determine the diameter of the mixed vapor cloud according to the natural gas explosion static model and the natural gas mass in the blasting test pipeline; determine the height of the mixed vapor cloud according to the natural gas explosion static model and the natural gas mass in the blasting test pipeline; determine the positions and angles of multiple ignition bomb launching devices relative to the blasting test pipeline according to the height and diameter of the mixed vapor cloud.

[0094] Further, the second calculation module is specifically configured to: construct an ignition bomb launching device positioning model according to the height and diameter of the mixed vapor cloud, and determine the positions of the ignition bomb launching devices relative to the blasting test pipeline and the angles of multiple ignition bomb launching devices in the ignition bomb launching device positioning model.

[0095] Further, the natural gas ignition system further includes: a third calculation module, configured to calculate the natural gas mass in the blasting test pipeline according to the specification parameters of the blasting test pipeline.

[0096] Further, the third calculation module is specifically configured to: calculate the natural gas volume in the blasting test pipeline according to the specification parameters of the blasting test pipeline; calculate the natural gas mass in the blasting test pipeline according to the natural gas density and the natural gas volume in the blasting test pipeline.

[0097] The natural gas ignition method and system of the present invention are applicable to the treatment of natural gas ignition in the full-scale gas explosion test of natural gas pipelines, quantitatively calculating the height and diameter of the natural gas and air mixed vapor cloud, so as to determine the height, angle and time of the ignition bullet launch, making the entire ignition process safe and controllable, and significantly reducing the environmental pollution of natural gas and the uncontrollable explosion risk during the test.

[0098] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for igniting natural gas in a full-scale gas explosion test, characterized in that It includes the following steps: Determining the positions and angles of multiple igniter launching devices relative to the blasting test pipeline according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline includes the following steps: When the natural gas reaches the ignition concentration, determining the diameter of the mixed vapor cloud according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline; Determining the height of the mixed vapor cloud according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline; Determining the positions and angles of multiple igniter launching devices relative to the blasting test pipeline according to the height and diameter of the mixed vapor cloud includes the following steps: Constructing an igniter launching device positioning model according to the height and diameter of the mixed vapor cloud. Specifically: Define the mixed vapor cloud as a circle with a diameter of D, and the center point of the circle is O. Define the height of the mixed vapor cloud as the straight line OA passing through the center O of the circle. Point A is the position point of the blasting test pipeline. Draw a straight line AB perpendicular to the straight line OA from point A, draw a straight line OE parallel to the straight line AB from point O, and the straight line OE intersects the circle at point C; Determining the position of the igniter launching device relative to the blasting test pipeline and the angles of multiple igniter launching devices in the igniter launching device positioning model; Among them, the static model of natural gas explosion is: ； ； In the formula, D is the diameter of the vapor cloud, H is the distance between the center of the vapor cloud sphere and the ground when reaching the ignition concentration, and m is the mass of natural gas; Determining the time for multiple igniter launching devices to launch igniters and the specifications of the igniters; Multiple igniter launching devices launch corresponding-specification igniters according to the determined time for launching igniters, and ignite the natural gas escaping from the blasting test pipeline. Among them, multiple igniter launching devices are arranged near the blasting test pipeline according to the determined positions and angles.

2. The natural gas ignition method in the full-scale gas blasting test according to claim 1, characterized in that Determining the time for multiple igniter launching devices to launch igniters and the specifications of the igniters includes the following steps: Calculating the time required for the natural gas escaping from the blasting test pipeline to rise to the height of the mixed vapor cloud; Determining the time for the igniter launching device at different setting points to launch the igniter according to the initial velocity of the igniter and the flight distance of the igniters launched by different igniter launching devices.

3. The natural gas ignition method in the full-scale gas blasting test according to claim 1 or 2, characterized in that, The natural gas ignition method further includes the step: Calculating the mass of natural gas in the blasting test pipeline according to the specification parameters of the blasting test pipeline. Specifically: Calculating the volume of natural gas in the blasting test pipeline according to the specification parameters of the blasting test pipeline; Calculating the mass of natural gas in the blasting test pipeline according to the density of natural gas and the volume of natural gas in the blasting test pipeline.

4. The natural gas ignition method in the full-scale gas blasting test according to claim 1, wherein Determining the position of the igniter launching device relative to the blasting test pipeline and the angles of multiple igniter launching devices in the igniter launching device positioning model specifically: Draw a straight line CA1 perpendicular to the straight line AB from point C. A1 is the intersection point of the straight line AB and the straight line CA1. A1 is the first setting point of the igniter launching device. Referring to the first setting point A1, sequentially determine the setting points of other igniter launching devices at a certain interval in the direction of the straight line A1B; The included angle formed by the connection line between the setting points of multiple igniter launching devices and point C and the straight line AB is the angle of multiple igniter launching devices, and the length of the connection line between the setting points of the igniter launching device and point C is the flight distance of the igniter.

5. A natural gas ignition system in a full-scale gas blasting test, characterized in that, It includes: The first calculation module is used to determine the positions and angles of multiple ignition cartridge launching devices relative to the blasting test pipeline according to the static model of natural gas explosion and the mass of natural gas, including the following steps: When the natural gas reaches the ignition concentration, determine the diameter of the mixed vapor cloud according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline; Determine the height of the mixed vapor cloud according to the static model of natural gas explosion and the mass of natural gas in the blasting test pipeline; Determine the positions and angles of multiple ignition cartridge launching devices relative to the blasting test pipeline according to the height and diameter of the mixed vapor cloud, including the following steps: Construct an ignition cartridge launching device positioning model according to the height and diameter of the mixed vapor cloud. Specifically: Define the mixed vapor cloud as a circle with a diameter of D, and the center point of the circle is O. Define the height of the mixed vapor cloud as the straight line OA passing through the center O of the circle. Point A is the position of the blasting test pipeline. Draw a straight line AB perpendicular to the straight line OA from point A, and draw a straight line OE parallel to the straight line AB from point O. The straight line OE intersects the circle at point C; Determine the positions of the ignition cartridge launching devices relative to the blasting test pipeline and the angles of multiple ignition cartridge launching devices in the ignition cartridge launching device positioning model; Among them, the static model of natural gas explosion is: ； ； In the formula, D is the diameter of the vapor cloud, H is the distance between the center of the vapor cloud sphere and the ground when reaching the ignition concentration, and m is the mass of natural gas; The second calculation module is used to determine the time for multiple ignition cartridge launching devices to launch ignition cartridges and the specifications of the ignition cartridges; Multiple ignition cartridge launching devices are used to launch corresponding specification ignition cartridges at the determined time of launching ignition cartridges, and ignite the natural gas escaping from the blasting test pipeline. Among them, multiple ignition cartridge launching devices are arranged near the blasting test pipeline according to the determined positions and angles.

6. The natural gas ignition system in the full-scale gas blasting test according to claim 5, characterized in that, The second calculation module is specifically used for: Calculate the time required for the natural gas escaping from the blasting test pipeline to rise to the height of the mixed vapor cloud; Determine the time for the ignition cartridge launching devices at different setting points to launch ignition cartridges according to the initial velocity of the ignition cartridges and the flight distances of the ignition cartridges launched by different ignition cartridge launching devices.

7. The natural gas ignition system in the full-scale gas explosion test according to claim 5 or 6, characterized in that, The natural gas ignition system further includes: The third calculation module is used to calculate the mass of natural gas in the blasting test pipeline according to the specification parameters of the blasting test pipeline. Specifically: Calculate the volume of natural gas in the blasting test pipeline according to the specification parameters of the blasting test pipeline; Calculate the mass of natural gas in the blasting test pipeline according to the density of natural gas and the volume of natural gas in the blasting test pipeline.

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