Multi-angle leakage concentration field and flame morphology testing method and system for natural gas pipelines

Abstract

The present invention provides a method and system for testing a multi-angle leakage concentration field and flame morphology of a natural gas pipeline, comprising: constructing a natural gas pipeline leakage model based on structural data and environmental characteristic data of a minimum monitoring unit of the natural gas pipeline; determining simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit based on the natural gas pipeline leakage model and computational fluid dynamics software; setting a natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and the simulated flame state parameters and obtaining the measured leakage gas state parameters and the measured flame state parameters; generating a knowledge base of a multi-angle leakage concentration field and flame morphology of the natural gas pipeline based on the measured and simulated leakage gas state parameters and the measured and simulated flame state parameters, which can solve the problem of inaccurate leakage state data of the existing natural gas pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas pipeline safety, and in particular to a method and system for testing a multi-angle leakage concentration field and flame form of a natural gas pipeline. Background Art

[0002] During the operation of natural gas pipelines, leakage accidents often occur. Existing technologies usually simulate different leakage situations based on a pre-built natural gas pipeline leakage test model to obtain natural gas pipeline leakage status data, and in the process of natural gas pipeline safety monitoring, natural gas pipeline safety assessment and emergency response strategy formulation are carried out based on real-time monitoring data and reference to the natural gas pipeline leakage status data obtained from the test.

[0003] However, the above-mentioned testing methods are often unable to fully reflect the complexity and dynamic changes of leakage accidents, resulting in inaccurate data on the leakage status of natural gas pipelines, which in turn leads to errors in the safety assessment results of natural gas pipelines and the formulated emergency response strategies. In severe cases, irreversible safety accidents may occur. Summary of the invention

[0004] The present invention provides a method and system for testing the multi-angle leakage concentration field and flame morphology of a natural gas pipeline, so as to solve the problem that the prior art is difficult to fully reflect the complexity and dynamic changes of leakage accidents, resulting in inaccurate leakage status data of the natural gas pipeline, and further leading to errors in the safety assessment results of the natural gas pipeline and the formulated emergency response strategy.

[0005] On the one hand, the present invention provides a method for testing a natural gas pipeline multi-angle leakage concentration field and flame morphology, comprising:

[0006] Taking the minimum monitoring unit of the natural gas pipeline as the target, a natural gas pipeline leakage model is constructed based on the structural data and environmental characteristic data of the minimum monitoring unit;

[0007] Perform numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0008] A natural gas pipeline leakage measurement platform is set based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and the natural gas pipeline leakage process is measured through the natural gas pipeline leakage measurement platform to obtain the measured leakage gas state parameters and the measured flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0009] Based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, a multi-angle leakage concentration field and flame morphology knowledge base of the natural gas pipeline is generated.

[0010] In an optional embodiment of the present application, the structural data includes length, diameter, material and wall thickness, and the environmental characteristic data includes terrain data, building data, vegetation data, environmental wind speed and wind direction data within a preset range around the minimum monitoring unit;

[0011] Accordingly, the natural gas pipeline leakage model is constructed based on the structural data and environmental characteristic data of the minimum monitoring unit, specifically including:

[0012] A natural gas pipeline sub-model is constructed based on the structural data of the minimum monitoring unit, an environmental sub-model is constructed based on the environmental characteristic data of the minimum monitoring unit, and the natural gas pipeline sub-model and the environmental sub-model are combined to obtain a natural gas pipeline leakage model.

[0013] In an optional embodiment of the present application, the natural gas pipeline leakage measurement platform is set based on the natural gas pipeline leakage model, the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit, and the simulated flame state parameters, specifically including:

[0014] Based on the natural gas pipeline leakage model, determine the setting method of the minimum monitoring unit object and the environmental simulation component;

[0015] Determining a setting mode of the monitoring device based on the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0016] A natural gas pipeline leakage measurement platform is set up based on the minimum monitoring unit entity, environmental simulation components and monitoring equipment.

[0017] In an optional embodiment of the present application, the monitoring equipment includes a spectral gas imager, a conventional camera, an infrared thermal imager, a high-speed camera, and a photographic drone array;

[0018] Accordingly, the setting mode of the monitoring device is determined based on the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including:

[0019] Determining the setting position of the spectral gas imager based on the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit;

[0020] Based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, the setting positions of the ordinary camera, infrared thermal imager, high-speed camera and photography drone array are determined.

[0021] In an optional embodiment of the present application, determining the setting position of the spectral gas imager based on the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit specifically includes:

[0022] Determining concentration field ranges corresponding to different leakage states of the minimum monitoring unit based on simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit;

[0023] Determining a simulated gas leakage area boundary corresponding to the minimum monitoring unit based on the simulated gas leakage concentration field range corresponding to different leakage states of the minimum monitoring unit;

[0024] The setting position of the spectral gas imager is determined based on the simulated gas leakage area boundary corresponding to the minimum monitoring unit and the axis direction of the actual minimum monitoring unit.

[0025] In an optional embodiment of the present application, the setting positions of the ordinary camera, infrared thermal imager, high-speed camera and photography drone array are determined based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including:

[0026] Determine the flame range and temperature field range corresponding to different leakage states of the minimum monitoring unit based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0027] Based on the flame ranges corresponding to different leakage states of the minimum monitoring unit, determining the setting positions of ordinary cameras, high-speed cameras and photography drone arrays corresponding to different leakage states;

[0028] Based on the temperature field range corresponding to the different leakage states of the minimum monitoring unit, the setting position of the infrared thermal imager corresponding to the different leakage states is determined.

[0029] In an optional embodiment of the present application, the multi-angle leakage concentration field and flame morphology knowledge base of the natural gas pipeline is generated based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including:

[0030] Determine the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0031] A knowledge base of multi-angle leakage concentration field and flame morphology of natural gas pipeline is constructed based on the standard values ​​of leakage gas state parameters and flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0032] In an optional embodiment of the present application, the method of determining the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit specifically includes:

[0033] Determine the comparison results of the measured leakage gas state parameters and the simulated leakage gas state parameters corresponding to the target leakage state of the minimum monitoring unit and the comparison results of the measured flame state parameters and the simulated flame state parameters;

[0034] Based on the comparison results of the measured leakage gas state parameters and the simulated leakage gas state parameters corresponding to the target leakage state of the minimum monitoring unit, and the comparison results of the measured flame state parameters and the simulated flame state parameters, the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit are determined.

[0035] In an optional embodiment of the present application, the numerical simulation calculation based on the natural gas pipeline leakage model and computational fluid dynamics software specifically includes:

[0036] Based on the natural gas pipeline leakage model and the corresponding target leakage state, determine the leakage source parameters and environmental parameters, and set the parameters;

[0037] Numerical simulation calculations corresponding to the target leakage state are performed through the preset flow model and combustion model.

[0038] In a second aspect, the present invention also provides a natural gas pipeline multi-angle leakage concentration field and flame shape testing system, comprising:

[0039] A natural gas pipeline leakage model building module is used to build a natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit of the natural gas pipeline, taking the minimum monitoring unit of the natural gas pipeline as the target;

[0040] A simulation leakage parameter determination module is used to perform numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine the simulation leakage gas state parameters and simulation flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0041] A measured leakage parameter acquisition module is used to set a natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and to measure the natural gas pipeline leakage process through the natural gas pipeline leakage measurement platform to obtain the measured leakage gas state parameters and the measured flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0042] The knowledge base generation module is used to generate a knowledge base of multi-angle leakage concentration field and flame morphology of natural gas pipelines based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0043] The present invention provides a method and system for testing the multi-angle leakage concentration field and flame morphology of a natural gas pipeline. The method takes the minimum monitoring unit of the natural gas pipeline as the target, constructs a natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit; performs numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; sets a natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and conducts natural gas pipeline leakage measurement through the natural gas pipeline leakage measurement platform. The process is measured to obtain the measured leakage gas state parameters and the measured flame state parameters corresponding to the different leakage states of the minimum monitoring unit; based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to the different leakage states of the minimum monitoring unit, a multi-angle leakage concentration field and flame morphology knowledge base of the natural gas pipeline is generated, which can guide the setting of the natural gas pipeline leakage measurement platform through numerical simulation results, ensure the accuracy and comprehensiveness of the measured results, and thus solve the problem that the existing technology is difficult to fully reflect the complexity and dynamic changes of leakage accidents, resulting in inaccurate leakage state data of the natural gas pipeline, and then leading to errors in the safety assessment results of the natural gas pipeline and the formulated emergency response strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic diagram of a flow chart of a method for testing a multi-angle leakage concentration field and flame morphology of a natural gas pipeline provided by the present invention;

[0046] Figure 2 A schematic diagram of the process of setting up a natural gas pipeline leakage measurement platform provided by the present invention;

[0047] Figure 3 A schematic diagram of a process for determining a setting method of a monitoring device provided by the present invention;

[0048] Figure 4 This is one of the schematic diagrams of the setting effect of the monitoring device provided by the present invention;

[0049] Figure 5 The second schematic diagram of the setting effect of the monitoring device provided by the present invention;

[0050] Figure 6 A structural block diagram of a natural gas pipeline multi-angle leakage concentration field and flame shape testing system provided by the present invention;

[0051] Figure 7 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] The specific implementation process of the method and system for testing the multi-angle leakage concentration field and flame shape of a natural gas pipeline in an embodiment of the present invention will be described below.

[0054] Figure 1 A flow chart of a method for testing a natural gas pipeline multi-angle leakage concentration field and flame morphology provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the method may include:

[0055] Step 101 , taking the minimum monitoring unit of the natural gas pipeline as a target, constructing a natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit.

[0056] Specifically, the minimum monitoring unit of a natural gas pipeline is a fixed length of pipeline, usually about 10 meters. Based on the above content, it can be seen that the existing testing methods are often difficult to fully reflect the complexity and dynamic changes of leakage accidents, resulting in inaccurate leakage status data of natural gas pipelines. In response to this problem, the natural gas pipeline multi-angle leakage concentration field and flame morphology testing method proposed in the embodiment of the present application maximizes the accuracy of the final natural gas pipeline leakage status data by combining numerical simulation and actual measurement.

[0057] More specifically, the embodiment of the present application first performs a numerical simulation of natural gas pipeline leakage with the minimum monitoring unit of the natural gas pipeline as the target, and constructs a natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit. Based on this, it is possible to accurately restore the real natural gas pipeline leakage scene on the basis of minimizing the amount of calculation, thereby ensuring that accurate simulated leakage gas state parameters and simulated flame state parameters are finally obtained, so as to guide the setting of the natural gas pipeline leakage measurement platform. Specifically, the structural data includes length, diameter, material and wall thickness, and the environmental characteristic data includes terrain data, building data, vegetation data, environmental wind speed and wind direction data within a preset range around the minimum monitoring unit;

[0058] Accordingly, the natural gas pipeline leakage model is constructed based on the structural data and environmental characteristic data of the minimum monitoring unit, specifically including:

[0059] A natural gas pipeline sub-model is constructed based on the structural data of the minimum monitoring unit, an environmental sub-model is constructed based on the environmental characteristic data of the minimum monitoring unit, and the natural gas pipeline sub-model and the environmental sub-model are combined to obtain a natural gas pipeline leakage model.

[0060] It is understandable that in the actual engineering application process, the natural gas pipeline may be set above ground or underground. Therefore, the environment around the natural gas pipeline will directly affect the leakage state of the natural gas, including the leakage path, leakage range and leakage speed, etc. Therefore, when constructing the natural gas pipeline leakage model, the embodiment of the present application not only constructs a natural gas pipeline sub-model based on the structural data of the minimum monitoring unit to restore the real natural gas pipeline to the maximum extent, but also constructs an environmental sub-model based on the environmental characteristic data of the minimum monitoring unit to restore the real environment of the natural gas pipeline to the maximum extent. Based on this, the accuracy of the natural gas pipeline leakage model can be guaranteed to the maximum extent.

[0061] Step 102, performing numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0062] Specifically, the numerical simulation calculation based on the natural gas pipeline leakage model and computational fluid dynamics software specifically includes:

[0063] Based on the natural gas pipeline leakage model and the corresponding target leakage state, determine the leakage source parameters and environmental parameters, and set the parameters;

[0064] Numerical simulation calculations corresponding to the target leakage state are performed through the preset flow model and combustion model.

[0065] It is worth noting that the target leakage state is composed of a leakage source target state and an environmental target state. The leakage source target state is composed of multiple leakage source sub-states, including the number of leakage ports, leakage port size, leakage angle and leakage pressure; the environmental target state is composed of multiple environmental sub-states, including temperature and humidity. Based on this, the accuracy and comprehensiveness of the natural gas leakage simulation can be guaranteed. According to the natural gas pipeline leakage model and the corresponding target leakage state, the leakage source parameters and environmental parameters can be determined and the parameters can be set.

[0066] After the parameters are set, the numerical simulation calculation corresponding to the target leakage state can be performed through the preset flow model and combustion model. Specifically, based on the leakage characteristics of natural gas, the flow model can select a turbulence model, such as a k-ε model or LES (large eddy simulation). The combustion model can select a PDF (probability density function) model, which is not specifically limited in the embodiments of the present application. It is understandable that before performing numerical simulation calculations, it is also necessary to set the solver parameters, including the time step and the convergence criterion. As for the specific setting method, the existing setting ideas can be adopted, which are not specifically limited in the embodiments of the present application.

[0067] Based on the above means, the embodiment of the present application can accurately determine the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit. It is worth noting that the leakage gas state parameters include the distribution range of the leakage gas and the corresponding leakage gas concentration within the preset period, and the flame state parameters include the distribution range of the flame within the preset period and the corresponding flame temperature. It can be understood that the preset period is a time period of preset length after the gas leakage occurs. The present application has found through research that usually in the early stage of natural gas leakage, the leakage gas cannot diffuse quickly due to the influence of surrounding obstacles, resulting in a high concentration, which is most likely to cause safety accidents. Therefore, accurate safety assessment can be performed based on the leakage state information of the initial period. Based on this, the embodiment of the present application only obtains the simulated leakage gas state parameters and simulated flame state parameters within the preset period. In this way, the workload of simulation calculation and subsequent actual measurement can be minimized on the basis of ensuring the accuracy of subsequent safety assessment. The length of the preset period can be obtained by multiple experiments or analysis of historical information of natural gas leakage accidents, and the embodiment of the present application is not specifically limited here.

[0068] Step S103, a natural gas pipeline leakage measurement platform is set based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and the natural gas pipeline leakage process is measured through the natural gas pipeline leakage measurement platform to obtain the measured leakage gas state parameters and the measured flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0069] Specifically, Figure 2 The following is a schematic diagram of the process flow of setting up the natural gas pipeline leakage measurement platform provided by the present invention, as shown in FIG. Figure 2 As shown, the natural gas pipeline leakage measurement platform is set based on the natural gas pipeline leakage model, the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit, and the simulated flame state parameters, specifically including:

[0070] Step 1031, based on the natural gas pipeline leakage model, determine the setting method of the minimum monitoring unit object and the environmental simulation component;

[0071] Step 1032, determining a setting mode of the monitoring device based on the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0072] Step 1033, setting up a natural gas pipeline leakage measurement platform based on the minimum monitoring unit entity, environmental simulation components and monitoring equipment.

[0073] It is understandable that, since the natural gas pipeline leakage model includes specific information about the natural gas pipeline and the environment, the embodiment of the present application can quickly determine the setting mode of the minimum monitoring unit entity and the environmental simulation component based on the natural gas pipeline leakage model. It is also understandable that the environmental simulation component includes subcomponents for simulating terrain, buildings and vegetation. It is worth noting that the embodiment of the present application simulates the position, quantity, size, angle and pressure of different leakage ports by setting a plurality of interconnected leakage branches at different positions on the minimum monitoring unit entity, that is, simulating the target state of the leakage source.

[0074] After the physical object and environmental simulation components of the minimum monitoring unit are set up, it is necessary to further set up monitoring equipment. The monitoring equipment includes a spectral gas imager, an ordinary camera, an infrared thermal imager, a high-speed camera and a photography drone array. The spectral gas imager is used to monitor the state parameters of the leaking gas. The spectral gas imager has the advantages of high efficiency, long distance, large range, dynamic and intuitive. It can realize long-distance and large-scale real-time dynamic imaging of multiple types of target gases, can well display the current leakage area and diffusion trend, and can also quickly shoot the diffusion gas cloud map, so as to realize the needs of gas imaging detection and diffusion situation assessment. Ordinary cameras, infrared thermal imagers, high-speed cameras and photography drone arrays are used to observe the flame state. Among them, ordinary cameras can observe the flame morphology; infrared thermal imagers can monitor more details of the flame morphology and measure the flame temperature at the same time; high-speed cameras can record the development process of the flame, clarifying the changing characteristics of the entire process from ignition to the formation of a stable flame; the drone array uses eight drones to form a circular array to record all directions of the flame, and combines video fusion and other technologies to form a three-dimensional image of the full-size high-pressure natural gas pipeline flame in a real environment.

[0075] On the basis of the above, accordingly, Figure 3 The following is a flow chart of determining the setting method of the monitoring equipment provided by the present invention, such as Figure 3 As shown, the setting mode of the monitoring device is determined based on the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including:

[0076] Step 10321, determining a setting position of a spectral gas imager based on simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit;

[0077] Step 10322, based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, determine the setting positions of the ordinary camera, infrared thermal imager, high-speed camera and photography drone array.

[0078] Specifically, determining the setting position of the spectral gas imager based on the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit specifically includes:

[0079] Determining concentration field ranges corresponding to different leakage states of the minimum monitoring unit based on simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit;

[0080] Determining a simulated gas leakage area boundary corresponding to the minimum monitoring unit based on the simulated gas leakage concentration field range corresponding to different leakage states of the minimum monitoring unit;

[0081] The setting position of the spectral gas imager is determined based on the simulated gas leakage area boundary corresponding to the minimum monitoring unit and the axis direction of the actual minimum monitoring unit.

[0082] It is worth noting that, since different leakage states correspond to different concentration field ranges, in order to ensure that the spectral gas imager can accurately monitor the leakage gas state parameters corresponding to different leakage states during the actual measurement process. The embodiment of the present application determines the boundary of the simulated leakage gas area corresponding to the minimum monitoring unit (which can be understood as the boundary of the union of the concentration field ranges corresponding to different leakage states) based on the simulated leakage gas concentration field range corresponding to different leakage states of the minimum monitoring unit. At the same time, considering that the monitoring range of the spectral gas imager is limited, the embodiment of the present application determines the setting position of the spectral gas imager based on the boundary of the simulated leakage gas area corresponding to the minimum monitoring unit and the axial direction of the actual minimum monitoring unit. Figure 4 This is one of the schematic diagrams of the setting effect of the monitoring device provided by the present invention, such as Figure 4 As shown, the spectral gas imager is arranged in the axial direction of the actual minimum monitoring unit and is located at the boundary of the simulated leaking gas area corresponding to the minimum monitoring unit. Based on this, the accuracy of the monitoring result can be guaranteed to the maximum extent while avoiding the influence of the leaking gas on the spectral gas imager.

[0083] Combination Figure 4 It can also be seen that the embodiment of the present application simulates different leakage port sizes and leakage angles by setting leakage branches of different diameters and angles, and controls the opening and closing of the branch pipes through solenoid valves. At the same time, the real-time status of the leakage source is monitored through temperature, pressure sensors, and flow meters to ensure that the leakage status corresponding to the actual measurement meets expectations.

[0084] Furthermore, the setting positions of the ordinary camera, infrared thermal imager, high-speed camera and photography drone array are determined based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including:

[0085] Determine the flame range and temperature field range corresponding to different leakage states of the minimum monitoring unit based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0086] Based on the flame ranges corresponding to different leakage states of the minimum monitoring unit, determining the setting positions of ordinary cameras, high-speed cameras and photography drone arrays corresponding to different leakage states;

[0087] Based on the temperature field range corresponding to the different leakage states of the minimum monitoring unit, the setting position of the infrared thermal imager corresponding to the different leakage states is determined.

[0088] It is worth noting that, due to the different flame ranges and temperature field ranges corresponding to different leakage states, it is necessary to dynamically adjust the position of the corresponding monitoring equipment when measuring the flame state parameters corresponding to different leakage states. Based on this, the embodiment of the present application first determines the setting positions of ordinary cameras, high-speed cameras and photography drone arrays corresponding to different leakage states based on the flame ranges corresponding to different leakage states of the minimum monitoring unit. It is worth noting that, since the flame will damage ordinary cameras, high-speed cameras and photography drone arrays, it is necessary to ensure that the above-mentioned equipment is located outside the flame range. Therefore, after determining the flame range corresponding to different leakage states of the minimum monitoring unit, the above-mentioned equipment can be set in the target area outside the flame range. Since the infrared thermal imager is sensitive to temperature, excessive temperature will not only damage the equipment, but also may lead to reduced detection accuracy. Based on this, the embodiment of the present application determines the setting position of the infrared thermal imager corresponding to different leakage states based on the temperature field range corresponding to different leakage states of the minimum monitoring unit. Specifically, the setting position of the infrared thermal imager is an area in the temperature field where the temperature is lower than the preset temperature threshold. The preset temperature threshold is the lowest temperature that will affect the detection accuracy of the infrared thermal imager and the device itself, which can be obtained through experiments and is not specifically limited in the embodiments of the present application. Figure 5 The second schematic diagram of the setting effect of the monitoring device provided by the present invention is as follows: Figure 5 The figure shows the top view of each monitoring device. It can be understood that Figure 5 The above is only an example of monitoring equipment setting method. In actual application, its setting method can be adaptively adjusted based on the above principles.

[0089] It should also be noted that after determining the setting method of the minimum monitoring unit, the environmental simulation component and the monitoring equipment, the embodiment of the present application will generate corresponding instruction information to guide the staff to set up the natural gas pipeline leakage measurement platform. After the natural gas pipeline leakage measurement platform is set up, the corresponding control instructions can be sent to the natural gas pipeline leakage measurement platform to perform measurements of different leakage states to obtain the measured leakage gas state parameters and measured flame state parameters corresponding to the different leakage states of the minimum monitoring unit.

[0090] Step S104, generating a knowledge base of multi-angle leakage concentration field and flame morphology of natural gas pipeline based on measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0091] Specifically, the generation of a knowledge base of a multi-angle leakage concentration field and flame morphology of a natural gas pipeline based on measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit specifically includes:

[0092] Determine the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0093] A knowledge base of multi-angle leakage concentration field and flame morphology of natural gas pipeline is constructed based on the standard values ​​of leakage gas state parameters and flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0094] The determining of the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit based on the measured leakage gas state parameters, the simulated leakage gas state parameters, the measured flame state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit specifically includes:

[0095] Determine the comparison results of the measured leakage gas state parameters and the simulated leakage gas state parameters corresponding to the target leakage state of the minimum monitoring unit and the comparison results of the measured flame state parameters and the simulated flame state parameters;

[0096] Based on the comparison results of the measured leakage gas state parameters and the simulated leakage gas state parameters corresponding to the target leakage state of the minimum monitoring unit, and the comparison results of the measured flame state parameters and the simulated flame state parameters, the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit are determined.

[0097] Based on the foregoing, it can be understood that the simulated leakage gas state parameters and simulated flame state parameters obtained by numerical simulation include parameters corresponding to the aboveground part and the underground part, while the measured leakage gas state parameters and measured flame state parameters obtained by actual measurement only include the aboveground part. Therefore, the comparison results of the measured leakage gas state parameters and the simulated leakage gas state parameters and the comparison results of the measured flame state parameters and the simulated flame state parameters in the embodiment of the present application are all comparison results of the parameters of the aboveground part. Under normal circumstances, the comparison results of the measured leakage gas state parameters and the simulated leakage gas state parameters and the comparison results of the measured flame state parameters and the simulated flame state parameters are relatively small. At this time, the state parameters obtained by actual measurement are used as standard values. Based on this, the matching degree between the standard value and the actual situation can be guaranteed to the maximum extent. However, when the difference value corresponding to one of the comparison results exceeds the preset difference threshold, it means that one of the numerical simulation results and the measured results must be wrong. Based on this, the embodiment of the present application can determine the obviously abnormal result according to the target leakage state, and then use the state parameter obtained by the other party as the standard value. It is worth noting that, in the case where it is determined that the numerical simulation results are erroneous, the embodiment of the present application will correct the target parameters in the numerical simulation based on the measured results, thereby continuously optimizing the numerical simulation process to ensure the accuracy of the data simulation results.

[0098] To summarize, based on the multi-angle leakage concentration field and flame morphology knowledge base of the natural gas pipeline obtained in the embodiment of the present application, the corresponding technical personnel can perform accurate natural gas pipeline safety assessment and emergency response strategy formulation based on the real-time data detected by the on-site monitoring equipment during the actual safety monitoring process.

[0099] The solution provided by the present invention takes the minimum monitoring unit of the natural gas pipeline as the target, constructs a natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit; performs numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; sets a natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model and the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and performs measurement of the natural gas pipeline leakage process through the natural gas pipeline leakage measurement platform to obtain the minimum leakage state of the minimum monitoring unit. The measured leakage gas state parameters and the measured flame state parameters corresponding to different leakage states of the monitoring unit; based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, a multi-angle leakage concentration field and flame morphology knowledge base of the natural gas pipeline is generated, which can guide the setting of the natural gas pipeline leakage measurement platform through numerical simulation results, ensure the accuracy and comprehensiveness of the measured results, and thus solve the problem that the existing technology is difficult to fully reflect the complexity and dynamic changes of leakage accidents, resulting in inaccurate natural gas pipeline leakage state data, and then leading to errors in the natural gas pipeline safety assessment results and the formulated emergency response strategies.

[0100] Figure 6 The present invention provides a structural block diagram of a natural gas pipeline multi-angle leakage concentration field and flame shape testing system, such as Figure 6 As shown, the system includes:

[0101] The natural gas pipeline leakage model building module 201 is used to build a natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit of the natural gas pipeline, taking the minimum monitoring unit of the natural gas pipeline as the target;

[0102] A simulation leakage parameter determination module 202 is used to perform numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine the simulation leakage gas state parameters and simulation flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0103] The measured leakage parameter acquisition module 203 is used to set a natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and to measure the natural gas pipeline leakage process through the natural gas pipeline leakage measurement platform to obtain the measured leakage gas state parameters and the measured flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0104] The knowledge base generation module 204 is used to generate a knowledge base of multi-angle leakage concentration field and flame shape of natural gas pipeline based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0105] The solution provided by the present invention takes the minimum monitoring unit of the natural gas pipeline as the target through the natural gas pipeline leakage model construction module 201, and constructs the natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit; the simulation leakage parameter determination module 202 performs numerical simulation calculation based on the natural gas pipeline leakage model and computational fluid dynamics software to determine the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; the measured leakage parameter acquisition module 203 sets a natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and measures the natural gas pipeline leakage through the natural gas pipeline leakage measurement platform. The pipeline leakage process is measured to obtain the measured leakage gas state parameters and the measured flame state parameters corresponding to different leakage states of the minimum monitoring unit; the knowledge base generation module 204 generates a knowledge base of multi-angle leakage concentration field and flame morphology of the natural gas pipeline based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and can guide the setting of the natural gas pipeline leakage measurement platform through numerical simulation results to ensure the accuracy and comprehensiveness of the measured results, thereby solving the problem that the existing technology is difficult to fully reflect the complexity and dynamic changes of leakage accidents, resulting in inaccurate leakage state data of the natural gas pipeline, and then leading to errors in the safety assessment results of the natural gas pipeline and the formulated emergency response strategy.

[0106] In an optional embodiment of the present application, the structural data includes length, diameter, material and wall thickness, and the environmental characteristic data includes terrain data, building data, vegetation data, environmental wind speed and wind direction data within a preset range around the minimum monitoring unit;

[0107] Accordingly, the natural gas pipeline leakage model is constructed based on the structural data and environmental characteristic data of the minimum monitoring unit, specifically including:

[0108] A natural gas pipeline sub-model is constructed based on the structural data of the minimum monitoring unit, an environmental sub-model is constructed based on the environmental characteristic data of the minimum monitoring unit, and the natural gas pipeline sub-model and the environmental sub-model are combined to obtain a natural gas pipeline leakage model.

[0109] In an optional embodiment of the present application, the natural gas pipeline leakage measurement platform is set based on the natural gas pipeline leakage model, the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit, and the simulated flame state parameters, specifically including:

[0110] Based on the natural gas pipeline leakage model, determine the setting method of the minimum monitoring unit object and the environmental simulation component;

[0111] Determining a setting mode of the monitoring device based on the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0112] A natural gas pipeline leakage measurement platform is set up based on the minimum monitoring unit entity, environmental simulation components and monitoring equipment.

[0113] In an optional embodiment of the present application, the monitoring equipment includes a spectral gas imager, a conventional camera, an infrared thermal imager, a high-speed camera, and a photographic drone array;

[0114] Accordingly, the setting mode of the monitoring device is determined based on the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including:

[0115] Determining the setting position of the spectral gas imager based on the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit;

[0116] Based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, the setting positions of the ordinary camera, infrared thermal imager, high-speed camera and photography drone array are determined.

[0117] In an optional embodiment of the present application, determining the setting position of the spectral gas imager based on the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit specifically includes:

[0118] Determining concentration field ranges corresponding to different leakage states of the minimum monitoring unit based on simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit;

[0119] Determining a simulated gas leakage area boundary corresponding to the minimum monitoring unit based on the simulated gas leakage concentration field range corresponding to different leakage states of the minimum monitoring unit;

[0120] The setting position of the spectral gas imager is determined based on the simulated gas leakage area boundary corresponding to the minimum monitoring unit and the axis direction of the actual minimum monitoring unit.

[0121] In an optional embodiment of the present application, the setting positions of the ordinary camera, infrared thermal imager, high-speed camera and photography drone array are determined based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including:

[0122] Determine the flame range and temperature field range corresponding to different leakage states of the minimum monitoring unit based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0123] Based on the flame ranges corresponding to different leakage states of the minimum monitoring unit, determining the setting positions of ordinary cameras, high-speed cameras and photography drone arrays corresponding to different leakage states;

[0124] Based on the temperature field range corresponding to the different leakage states of the minimum monitoring unit, the setting position of the infrared thermal imager corresponding to the different leakage states is determined.

[0125] In an optional embodiment of the present application, the multi-angle leakage concentration field and flame morphology knowledge base of the natural gas pipeline is generated based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including:

[0126] Determine the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit;

[0127] A knowledge base of multi-angle leakage concentration field and flame morphology of natural gas pipeline is constructed based on the standard values ​​of leakage gas state parameters and flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0128] In an optional embodiment of the present application, the method of determining the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit specifically includes:

[0129] Determine the comparison results of the measured leakage gas state parameters and the simulated leakage gas state parameters corresponding to the target leakage state of the minimum monitoring unit and the comparison results of the measured flame state parameters and the simulated flame state parameters;

[0130] Based on the comparison results of the measured leakage gas state parameters and the simulated leakage gas state parameters corresponding to the target leakage state of the minimum monitoring unit, and the comparison results of the measured flame state parameters and the simulated flame state parameters, the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit are determined.

[0131] In an optional embodiment of the present application, the numerical simulation calculation based on the natural gas pipeline leakage model and computational fluid dynamics software specifically includes:

[0132] Based on the natural gas pipeline leakage model and the corresponding target leakage state, determine the leakage source parameters and environmental parameters, and set the parameters;

[0133] Numerical simulation calculations corresponding to the target leakage state are performed through the preset flow model and combustion model.

[0134] Figure 7 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 7 As shown, the electronic device may include: a processor (processor) 301, a communication interface (Communications Interface) 302, a memory (memory) 303 and a communication bus 304, wherein the processor 301, the communication interface 302, and the memory 303 communicate with each other through the communication bus 304. The processor 301 can call the logic instructions in the memory 303 to execute the multi-angle leakage concentration field and flame morphology testing method of the natural gas pipeline, which includes: taking the minimum monitoring unit of the natural gas pipeline as the target, constructing a natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit; performing numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; setting a natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and measuring the natural gas pipeline leakage process through the natural gas pipeline leakage measurement platform to obtain the measured leakage gas state parameters and measured flame state parameters corresponding to different leakage states of the minimum monitoring unit; generating a multi-angle leakage concentration field and flame morphology knowledge base for the natural gas pipeline based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0135] In addition, the logic instructions in the above-mentioned memory 303 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0136] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the natural gas pipeline multi-angle leakage concentration field and flame morphology testing method provided by the above methods. The method includes: taking the minimum monitoring unit of the natural gas pipeline as the target, constructing a natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit; performing numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; setting a natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and measuring the natural gas pipeline leakage process through the natural gas pipeline leakage measurement platform to obtain the measured leakage gas state parameters and measured flame state parameters corresponding to different leakage states of the minimum monitoring unit; generating a natural gas pipeline multi-angle leakage concentration field and flame morphology knowledge base based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0137] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for testing a natural gas pipeline multi-angle leakage concentration field and flame morphology provided by the above-mentioned methods, the method comprising: taking a minimum monitoring unit of a natural gas pipeline as a target, constructing a natural gas pipeline leakage model based on structural data and environmental characteristic data of the minimum monitoring unit; performing numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; setting a natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and measuring the natural gas pipeline leakage process through the natural gas pipeline leakage measurement platform to obtain measured leakage gas state parameters and measured flame state parameters corresponding to different leakage states of the minimum monitoring unit; generating a knowledge base of natural gas pipeline multi-angle leakage concentration field and flame morphology based on measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit.

[0138] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0139] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the natural gas pipeline multi-angle leakage concentration field and flame morphology test method described in each embodiment or some parts of the embodiment.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing the multi-angle leakage concentration field and flame morphology of a natural gas pipeline, characterized in that: include: Taking the minimum monitoring unit of the natural gas pipeline as the target, a natural gas pipeline leakage model is constructed based on the structural data and environmental characteristic data of the minimum monitoring unit; Perform numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine the simulated leakage gas state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; A natural gas pipeline leakage measurement platform is set based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and the natural gas pipeline leakage process is measured through the natural gas pipeline leakage measurement platform to obtain the measured leakage gas state parameters and the measured flame state parameters corresponding to different leakage states of the minimum monitoring unit; Generate a knowledge base of multi-angle leakage concentration field and flame morphology of natural gas pipeline based on measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; The structural data includes length, diameter, material and wall thickness, and the environmental characteristic data includes terrain data, building data, vegetation data, environmental wind speed and wind direction data within a preset range around the minimum monitoring unit; The setting of the natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit, and the simulated flame state parameters specifically includes: Based on the natural gas pipeline leakage model, determine the setting method of the minimum monitoring unit object and the environmental simulation component; Determining a setting mode of the monitoring device based on the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; A natural gas pipeline leakage measurement platform is set up based on the minimum monitoring unit object, environmental simulation components and monitoring equipment; The monitoring equipment includes spectral gas imagers, ordinary cameras, infrared thermal imagers, high-speed cameras and photography drone arrays; Accordingly, the setting mode of the monitoring device is determined based on the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including: Determining the setting position of the spectral gas imager based on the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit; Based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, the setting positions of the ordinary camera, infrared thermal imager, high-speed camera and photography drone array are determined.

2. The method for testing the multi-angle leakage concentration field and flame morphology of a natural gas pipeline according to claim 1 is characterized in that: The step of constructing a natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit specifically includes: A natural gas pipeline sub-model is constructed based on the structural data of the minimum monitoring unit, an environmental sub-model is constructed based on the environmental characteristic data of the minimum monitoring unit, and the natural gas pipeline sub-model and the environmental sub-model are combined to obtain a natural gas pipeline leakage model.

3. The method for testing the multi-angle leakage concentration field and flame morphology of a natural gas pipeline according to claim 2 is characterized in that: The step of determining the setting position of the spectral gas imager based on the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit specifically includes: Determining concentration field ranges corresponding to different leakage states of the minimum monitoring unit based on simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit; Determining a simulated gas leakage area boundary corresponding to the minimum monitoring unit based on the simulated gas leakage concentration field range corresponding to different leakage states of the minimum monitoring unit; The setting position of the spectral gas imager is determined based on the simulated gas leakage area boundary corresponding to the minimum monitoring unit and the axis direction of the actual minimum monitoring unit.

4. The method for testing the multi-angle leakage concentration field and flame shape of a natural gas pipeline according to claim 3 is characterized in that: The method of determining the setting positions of the ordinary camera, the infrared thermal imager, the high-speed camera and the photography drone array based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit specifically includes: Determine the flame range and temperature field range corresponding to different leakage states of the minimum monitoring unit based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; Based on the flame ranges corresponding to different leakage states of the minimum monitoring unit, determining the setting positions of ordinary cameras, high-speed cameras and photography drone arrays corresponding to different leakage states; Based on the temperature field range corresponding to the different leakage states of the minimum monitoring unit, the setting position of the infrared thermal imager corresponding to the different leakage states is determined.

5. The method for testing the multi-angle leakage concentration field and flame morphology of a natural gas pipeline according to claim 4 is characterized in that: The method generates a knowledge base of multi-angle leakage concentration field and flame morphology of a natural gas pipeline based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including: Determine the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit based on the measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; A knowledge base of multi-angle leakage concentration field and flame morphology of natural gas pipeline is constructed based on the standard values ​​of leakage gas state parameters and flame state parameters corresponding to different leakage states of the minimum monitoring unit.

6. The method for testing the multi-angle leakage concentration field and flame shape of a natural gas pipeline according to claim 5 is characterized in that: The determining of the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit based on the measured leakage gas state parameters, the simulated leakage gas state parameters, the measured flame state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit specifically includes: Determine the comparison results of the measured leakage gas state parameters and the simulated leakage gas state parameters corresponding to the target leakage state of the minimum monitoring unit and the comparison results of the measured flame state parameters and the simulated flame state parameters; Based on the comparison results of the measured leakage gas state parameters and the simulated leakage gas state parameters corresponding to the target leakage state of the minimum monitoring unit, and the comparison results of the measured flame state parameters and the simulated flame state parameters, the standard values ​​of the leakage gas state parameters and the standard values ​​of the flame state parameters corresponding to different leakage states of the minimum monitoring unit are determined.

7. The method for testing the multi-angle leakage concentration field and flame morphology of a natural gas pipeline according to claim 6 is characterized in that: The numerical simulation calculation based on the natural gas pipeline leakage model and computational fluid dynamics software specifically includes: Based on the natural gas pipeline leakage model and the corresponding target leakage state, determine the leakage source parameters and environmental parameters, and set the parameters; Numerical simulation calculations corresponding to the target leakage state are performed through the preset flow model and combustion model.

8. A natural gas pipeline multi-angle leakage concentration field and flame shape testing system, characterized in that: include: A natural gas pipeline leakage model building module is used to build a natural gas pipeline leakage model based on the structural data and environmental characteristic data of the minimum monitoring unit of the natural gas pipeline, taking the minimum monitoring unit of the natural gas pipeline as the target; A simulation leakage parameter determination module is used to perform numerical simulation calculations based on the natural gas pipeline leakage model and computational fluid dynamics software to determine the simulation leakage gas state parameters and simulation flame state parameters corresponding to different leakage states of the minimum monitoring unit; A measured leakage parameter acquisition module is used to set a natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, and to measure the natural gas pipeline leakage process through the natural gas pipeline leakage measurement platform to obtain the measured leakage gas state parameters and the measured flame state parameters corresponding to different leakage states of the minimum monitoring unit; A knowledge base generation module, for generating a knowledge base of multi-angle leakage concentration field and flame morphology of a natural gas pipeline based on measured leakage gas state parameters, simulated leakage gas state parameters, measured flame state parameters and simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; The structural data includes length, diameter, material and wall thickness, and the environmental characteristic data includes terrain data, building data, vegetation data, environmental wind speed and wind direction data within a preset range around the minimum monitoring unit; The setting of the natural gas pipeline leakage measurement platform based on the natural gas pipeline leakage model, the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit, and the simulated flame state parameters specifically includes: Based on the natural gas pipeline leakage model, determine the setting method of the minimum monitoring unit object and the environmental simulation component; Determining a setting mode of the monitoring device based on the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit; A natural gas pipeline leakage measurement platform is set up based on the minimum monitoring unit object, environmental simulation components and monitoring equipment; The monitoring equipment includes spectral gas imagers, ordinary cameras, infrared thermal imagers, high-speed cameras and photography drone arrays; Accordingly, the setting mode of the monitoring device is determined based on the simulated leakage gas state parameters and the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, specifically including: Determining the setting position of the spectral gas imager based on the simulated leakage gas state parameters corresponding to different leakage states of the minimum monitoring unit; Based on the simulated flame state parameters corresponding to different leakage states of the minimum monitoring unit, the setting positions of the ordinary camera, infrared thermal imager, high-speed camera and photography drone array are determined.

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