Method and system for measuring hazardous gas diffusion hazard area

Abstract

The embodiment of the present application provides a kind of dangerous gas diffusion harm area determination method and system, belong to gas diffusion area determination detection field.The determination method includes: under the condition that pollution source releases, the pollution experiment detection concentration of the set detection point in wind tunnel under the action of different wind directions is acquired, and the detection model corresponding to the actual topographic feature of the region to be measured is arranged in the wind tunnel;The set detection point in the wind tunnel is evenly arranged between the flue gas release point and the boundary of the detection model;The acquired experimental detection concentration is compared with the selected concentration hazard threshold respectively, and the position of the set detection point corresponding to the experimental detection concentration matched with the selected concentration hazard threshold is taken as the first diffusion position;According to the first diffusion position, the dangerous gas diffusion harm area matched with the selected concentration hazard threshold is determined.The reliability and accuracy of the present application are higher compared with numerical simulation through wind tunnel experiment test result.

Description

Technical Field

[0001] This invention relates to the field of gas diffusion area measurement and detection, specifically to a method and system for measuring hazardous gas diffusion hazard areas. Background Technology

[0002] The diffusion of toxic, flammable, and explosive gases can cause poisoning and fire / explosion hazards, thus requiring accurate and quantitative determination of their affected areas. Current methods for determining the impact of hazardous gas diffusion primarily involve numerical simulation, including two-dimensional and three-dimensional simulations. Two-dimensional simulations calculate the diffusion impact area under ideal conditions based on empirical formulas and models, but these calculations are performed on a plane and cannot account for complex terrain conditions, such as mountainous areas. Three-dimensional simulations, also based on computational fluid dynamics (CFD), cannot simultaneously simulate the effects of complex terrain, wind speed, wind direction, etc., on the diffusion area. Furthermore, CFD three-dimensional simulation results involve excessive simplifications and assumptions, limiting their accuracy and reliability.

[0003] Existing numerical simulation methods, due to the limitations of their numerical models, cannot effectively determine the diffusion hazard area at a specific location under different leakage conditions, influenced by factors such as complex terrain, obstacles, and complex atmospheric turbulence. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for determining the hazardous area of ​​dangerous gas diffusion, solving the problem of predicting the hazardous area of ​​diffusion in complex diffusion processes such as the presence of obstacles or significant topographical changes under leakage conditions.

[0005] To achieve the above objectives, embodiments of the present invention provide a method for determining the hazardous area of ​​dangerous gas diffusion, the method comprising:

[0006] Under the condition of pollution source release, the pollution concentration of a set detection point in a wind tunnel under different wind directions is obtained. The wind tunnel is equipped with a detection model corresponding to the actual terrain features of the area to be tested. The set detection points are evenly distributed between the flue gas release point and the boundary of the detection model.

[0007] The obtained experimental detection concentrations are compared with the selected concentration hazard thresholds, and the location of the set detection point corresponding to the experimental detection concentration that matches the selected concentration hazard threshold is taken as the first diffusion location.

[0008] Based on the first diffusion location, a hazardous gas diffusion hazard area matching the selected concentration hazard threshold is determined.

[0009] Optionally, the experimental detection concentration can be matched with the selected concentration hazard threshold in the following ways:

[0010] Based on the selected experimental detection concentration, the actual detection concentration of the actual terrain features in the test area corresponding to the selected experimental detection concentration is obtained by using the correspondence between the experimental detection concentration and the actual detection concentration of the actual terrain features in the test area. If the actual detection concentration is equal to the selected concentration hazard threshold, then it is determined that the experimental detection concentration corresponding to the actual detection concentration matches the selected concentration hazard threshold.

[0011] Optionally, the correspondence between the experimentally detected concentration and the actual detected concentration of the actual terrain features in the area to be tested is as follows:

[0012]

[0013] Among them, C p The actual detected concentration represents the actual topographic features of the area to be tested; C m For experimental concentration detection; u p u represents the characteristic velocity of the actual diffusion of the prototype gas in the test area. m To detect the characteristic velocity of gas diffusion in the region where the model is located; σ ym To detect the horizontal diffusion parameter σ at a distance x from the leak source in the model downwind direction; yp σz represents the horizontal diffusion parameter of the actual downwind area in the model at a distance x from the leakage source; m σz represents the vertical diffusion parameter downwind at a distance x from the leakage source in the model; p C represents the vertical diffusion parameter at a distance x from the prototype leak source in the actual downwind direction of the area to be measured; Op C represents the actual volumetric concentration of pollutants at the chimney outlet within the area to be measured. Om To detect the volumetric concentration of pollutants at the model chimney outlet; Q m To detect the total release of flue gas within a preset time period in the model; Q p This represents the total amount of flue gas released within a preset time period in the area to be tested.

[0014] Optionally, before comparing the experimentally detected concentration with a selected concentration hazard threshold, the determination method further includes: normalizing the experimentally detected pollution concentration.

[0015] Optionally, determining the hazardous gas diffusion hazard area that matches the selected concentration hazard threshold based on the first diffusion location includes:

[0016] Clustering algorithms are used to correct the first diffusion position, removing the off-center positions in the first diffusion position to obtain the corrected diffusion position;

[0017] The edge lines of the region where the corrected diffusion location is located are drawn using interpolated spline curves to determine the edge position of the region where the corrected diffusion location is located.

[0018] The present invention also provides a system for measuring hazardous gas diffusion hazard areas, the system comprising:

[0019] The acquisition module is used to acquire the experimental concentration of pollution at a set detection point in the wind tunnel under different wind directions under the condition of pollution source release. The wind tunnel is equipped with a detection model corresponding to the actual terrain features of the area to be tested.

[0020] The processing module is used to compare the acquired experimental detection concentration with the selected concentration hazard threshold, and take the location of the set detection point corresponding to the experimental detection concentration that matches the selected concentration hazard threshold as the first diffusion location; and determine the hazardous gas diffusion hazard area that matches the selected concentration hazard threshold based on the first diffusion location.

[0021] Optionally, the processing module determines whether the experimentally detected concentration matches the selected concentration hazard threshold according to the following method:

[0022] Based on the selected experimental detection concentration, the actual detection concentration of the actual terrain features in the test area corresponding to the selected experimental detection concentration is obtained by using the correspondence between the experimental detection concentration and the actual detection concentration of the actual terrain features in the test area. If the actual detection concentration is equal to the selected concentration hazard threshold, then it is determined that the experimental detection concentration corresponding to the actual detection concentration matches the selected concentration hazard threshold.

[0023] Optionally, the correspondence between the experimentally detected concentration and the actual detected concentration of the actual terrain features in the area to be tested is as follows:

[0024]

[0025] Among them, C p The actual detected concentration represents the actual topographic features of the area to be tested; C m For experimental concentration detection; u p u represents the characteristic velocity of the actual diffusion of the prototype gas in the test area. m To detect the characteristic velocity of gas diffusion in the region where the model is located; σ ym To detect the horizontal diffusion parameter σ at a distance x from the leak source in the model downwind direction; yp σz represents the horizontal diffusion parameter of the actual downwind area in the model at a distance x from the leakage source; m σz represents the vertical diffusion parameter downwind at a distance x from the leakage source in the model; p C represents the vertical diffusion parameter at a distance x from the prototype leak source in the actual downwind direction of the area to be measured; Op C represents the actual volumetric concentration of pollutants at the chimney outlet within the area to be measured. Om To detect the volumetric concentration of pollutants at the model chimney outlet; Qm To detect the total release of flue gas within a preset time period in the model; Q p This represents the total amount of flue gas released within a preset time period in the area to be tested.

[0026] Optionally, the processing module is further configured to normalize the experimental contamination detection concentration before comparing it with a selected concentration hazard threshold.

[0027] Optionally, determining the hazardous gas diffusion hazard area that matches the selected concentration hazard threshold based on the first diffusion location includes:

[0028] Clustering algorithms are used to correct the first diffusion position, removing the off-center positions in the first diffusion position to obtain the corrected diffusion position;

[0029] The edge lines of the region where the corrected diffusion location is located are drawn using interpolated spline curves to determine the edge position of the region where the corrected diffusion location is located.

[0030] Through the above technical solution, under the condition of pollution source release, the pollution concentration of a set detection point in a wind tunnel under different wind directions is obtained. The wind tunnel is equipped with a detection model corresponding to the actual terrain features of the area to be tested. Compared with numerical simulation, the reliability and accuracy of the test results obtained through wind tunnel experiments are higher. The pollution concentration of the set detection point in the wind tunnel under different wind directions effectively considers the influence of complex terrain, different wind directions and wind speeds, and gives irregular concentration contour lines under complex conditions, which solves the defect that two-dimensional numerical simulation cannot consider factors such as complex terrain. Furthermore, it can simultaneously give the all-round hazard impact area under all wind directions. By matching the hazard area boundary with the concentration hazard threshold, the external safety protection distance under complex conditions can be quantitatively determined.

[0031] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the method for determining the hazardous area of ​​dangerous gas diffusion provided in the embodiments of this application;

[0034] Figure 2 This is a schematic diagram of the experimental concentration distribution in the method for determining the hazardous area of ​​gas diffusion provided in the embodiments of this application. Detailed Implementation

[0035] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0036] This invention provides a method for determining the hazardous gas diffusion hazard area. The method includes: under pollution source release conditions, obtaining the experimental detection concentration of pollution at a set detection point in a wind tunnel under different wind directions; the wind tunnel is equipped with a detection model corresponding to the actual terrain features of the area to be tested; comparing the obtained experimental detection concentration with a selected concentration hazard threshold; and taking the location of the set detection point corresponding to the experimental detection concentration that matches the selected concentration hazard threshold as the first diffusion location; and determining the hazardous gas diffusion hazard area matching the selected concentration hazard threshold based on the first diffusion location. The detection points in the wind tunnel are evenly distributed between the flue gas release point and the boundary of the experimental model. Preferably, based on the design accuracy requirements, the detection points are more densely distributed near the flue gas release point, such as within 10m. The distance between the nearest detection point and the release point in the wind tunnel model, after conversion to the actual distance of the prototype, does not exceed 50m.

[0037] like Figure 1 As shown, specifically, in this embodiment, when establishing the model corresponding to the actual terrain features of the area to be tested, a physical model is established based on the actual terrain features of the leak area and similarity theory. Wind tunnel experiments determine that all wind directions are preferably eight: N (North), E (East), S (South), W (West), NE (Northeast), NW (Northwest), SW (Southwest), and EW (Northwest); the angle between these eight adjacent wind directions (N, E, S, W, NE, NW, SW, EW) is 45 degrees. Three wind speeds can be selected (low wind speed: 1-3 m / s, medium wind speed: 3-5 m / s, high wind speed: >5 m / s), specifically set according to the testing requirements. First, based on dimensional analysis and similarity theory, the following conditions are ensured to meet the similarity criteria:

[0038] (1) Geometric similarity criterion. The leakage source model and the terrain of the region of interest, as well as other buildings and obstacles near the leakage source that have a significant impact on the flow field, should meet relatively strict geometric similarity to ensure similarity of the solid wall edge conditions of the flow. The experiment uses a scale of 1:1000.

[0039] (2) Reynolds number Re = UL / v independence criterion. U is the wind speed at the boundary layer height (above 300m) of the incoming flow; L is the boundary layer height δ as a reference; v is the kinetic viscosity of the incoming flow; the Reynolds order of magnitude is not less than 104 when simulating the atmospheric boundary layer.

[0040] (3) Model surface roughness Reynolds number Re*=z0u f / v irrelevance criterion. For local flow on the model surface, the roughness Reynolds number Re*=z0u is used. f / v>2.5 is used as the criterion, where u f The friction speed is used to ensure that the wall surface is aerodynamically rough.

[0041] (4) Wind field similarity test. The simulated wind field is tested, including the similarity of the average wind speed profile, turbulence intensity profile and turbulence spectrum between the upstream inflow and the simulated region of interest.

[0042] Furthermore, the correspondence between the concentration field experimental (model) and the field (the actual terrain features of the area to be tested are also called the prototype) can be determined, that is, the correspondence between the experimentally detected concentration and the actual detected concentration of the actual terrain features of the area to be tested. The specific correspondence is as follows:

[0043]

[0044] Among them, C p The actual detected concentration represents the actual topographic features of the area to be tested; C m For experimental concentration detection; u p u represents the characteristic velocity of the actual diffusion of the prototype gas in the test area. m To detect the characteristic velocity of gas diffusion in the region where the model is located; σ ym To detect the horizontal diffusion parameter σ at a distance x from the leak source in the model downwind direction; yp σz represents the horizontal diffusion parameter of the actual downwind area in the model at a distance x from the leakage source; m σz represents the vertical diffusion parameter downwind at a distance x from the leakage source in the model; p C represents the vertical diffusion parameter at a distance x from the prototype leak source in the actual downwind direction of the area to be measured; Op C represents the actual volumetric concentration of pollutants at the chimney outlet within the area to be measured. Om To detect the volumetric concentration of pollutants at the model chimney outlet; Q m To detect the total release of flue gas within a preset time period in the model; Q p Q is the total release of flue gas in the test area within a preset time; preferably, Q m To detect the total emission of flue gas from the model within 1 hour; Q p This represents the total amount of actual flue gas released in the tested area within one hour.

[0045] This embodiment uses a low-speed wind tunnel with a test section length of more than 20 meters, a width and height of more than 2 meters, and a corresponding Reynolds number (Re number) on the order of 104 or higher.

[0046] The specific process for wind speed measurement is as follows: The wind speed can be determined according to experimental requirements. In this embodiment, the multi-year average wind speed based on the actual terrain characteristics of the area to be measured is used, while considering both a lower and a higher wind speed, i.e., at least three types of wind speed are considered. The wind speed profile is measured using a TSI-IFA300 hot-wire (film) anemometer, calibrated before measurement using its built-in calibration unit (jet wind tunnel). The velocity signal is converted via an A / D converter, sampled by a computer, and processed. Incoming flow monitoring is performed using a TSI portable anemometer. The conversion between the hot-wire probe voltage and wind speed is performed using the King formula: E 2 =E0 2 +aU b In the formula, E represents voltage, E0 represents voltage when wind speed is zero, U represents wind speed, and a and b are fitting parameters; the relationship between probe voltage and wind speed can also be directly fitted using polynomial fitting.

[0047] In this embodiment, wind speed measurement is mainly used to determine the incoming free flow ahead. A hot wire is placed near the release source, 10mm above the ground (equivalent to 10m on-site), and the correspondence between the local wind speed and the incoming free flow is recorded to find the required free flow wind speed ahead of the wind tunnel and the corresponding fan speed. Eight wind directions are used: N, NE, E, SE, S, SW, W, and NW. The change in wind direction is represented by rotating the physical model in the wind tunnel.

[0048] For the measurement of experimental concentrations, appropriate tracer gas detectors were used. Hydrogen sulfide was selected for diffusion; ethylene, with a molecular weight similar to that of hydrogen sulfide, was selected as the tracer gas for concentration measurement, using an Erannetex MS600 photoionized ethylene detector; the instrument's range is 0-2000 ppm, with a minimum displayed concentration of 1 ppm.

[0049] Furthermore, the experimental detection concentration is determined to match the selected concentration hazard threshold in the following manner:

[0050] Based on the selected experimental detection concentration, the actual detection concentration of the actual terrain features in the test area corresponding to the selected experimental detection concentration is obtained by using the correspondence between the experimental detection concentration and the actual detection concentration of the actual terrain features in the test area. If the actual detection concentration is equal to the selected concentration hazard threshold, then it is determined that the experimental detection concentration corresponding to the actual detection concentration matches the selected concentration hazard threshold.

[0051]

[0052] Table 1 Explanation of Hazardous Gas Impact Thresholds

[0053] As shown in the hazardous gas impact threshold description table, different impact thresholds Ccritical are selected according to the hazardous gas to be analyzed; in this example, an hourly lethal concentration of 200 ppm is selected.

[0054] Optionally, before comparing the experimentally detected concentration with the selected concentration hazard threshold, the determination method further includes: normalizing the experimentally detected pollution concentration. Specifically, the rounding rule of "rounding to the nearest even number" is used, where "four" means discarding if the units digit of the statistically measured sampling concentration C0 is ≤4, "six" means rounding up if the units digit of C0 is ≥6, and "five" refers to the number after 5: if the number before 5 is odd, round up to 1; if the number before 5 is even, round down to 0 (0 is an even number). For example...

[0055] Table 2 shows the comparison table.

[0056]

[0057] Table 2 Initial Concentration C initial

[0058] Optionally, determining the hazardous gas diffusion hazard area matching the selected concentration hazard threshold based on the first diffusion location includes: correcting the first diffusion location using a clustering algorithm to remove off-center locations and obtain a corrected diffusion location; and drawing edge lines for the edge points of the area where the corrected diffusion location is located using interpolated spline curves to determine the edge position of the area where the corrected diffusion location is located. Specifically, the existing K-Means clustering algorithm can be used.

[0059] First, divide all initial diffusion locations into regions based on wind direction, and randomly initialize the center point position for each region. The center point position is the location with the same vector length as other points within the region. Calculate the distance from each data point to the center point; assign the data point to the region whose center point is closest, and then recalculate the center point position for each region as the new center point position. Repeat the above steps until the center position of each region changes little after each iteration. Alternatively, you can randomly initialize the center points multiple times, then select the one with the best result as the optimization center; then remove points whose distance from the optimization center is greater than a preset value to obtain the corrected region of the initial diffusion location. Finally, connect adjacent edge points of the corrected region using interpolated spline curves. Figure 2 The edge points represent the farthest coordinates of the same concentration under all wind directions, thus determining the diffusion area of ​​an hourly lethal concentration of 200 ppm.

[0060] Corresponding to the above-described measurement method, the present invention also provides a hazardous gas diffusion hazard area measurement system, the measurement system comprising:

[0061] The acquisition module is used to acquire the experimental concentration of pollution at a set detection point in the wind tunnel under different wind directions under the condition of pollution source release. The wind tunnel is equipped with a detection model corresponding to the actual terrain features of the area to be tested.

[0062] The processing module is used to compare the acquired experimental detection concentration with the selected concentration hazard threshold, and take the location of the set detection point corresponding to the experimental detection concentration that matches the selected concentration hazard threshold as the first diffusion location; and determine the hazardous gas diffusion hazard area that matches the selected concentration hazard threshold based on the first diffusion location.

[0063] Optionally, the processing module determines whether the experimentally detected concentration matches the selected concentration hazard threshold according to the following method:

[0064] Based on the selected experimental detection concentration, the actual detection concentration of the actual terrain features in the test area corresponding to the selected experimental detection concentration is obtained by using the correspondence between the experimental detection concentration and the actual detection concentration of the actual terrain features in the test area. If the actual detection concentration is equal to the selected concentration hazard threshold, then it is determined that the experimental detection concentration corresponding to the actual detection concentration matches the selected concentration hazard threshold.

[0065] Optionally, the correspondence between the experimentally detected concentration and the actual detected concentration of the actual terrain features in the area to be tested is as follows:

[0066]

[0067] Among them, C p The actual detected concentration represents the actual topographic features of the area to be tested; C m For experimental concentration detection; u p u represents the characteristic velocity of the actual diffusion of the prototype gas in the test area. m To detect the characteristic velocity of gas diffusion in the region where the model is located; σ ym To detect the horizontal diffusion parameter σ at a distance x from the leak source in the model downwind direction; yp σz represents the horizontal diffusion parameter of the actual downwind area in the model at a distance x from the leakage source; m σz represents the vertical diffusion parameter downwind at a distance x from the leakage source in the model; p C represents the vertical diffusion parameter at a distance x from the prototype leak source in the actual downwind direction of the area to be measured; Op C represents the actual volumetric concentration of pollutants at the chimney outlet within the area to be measured. Om To detect the volumetric concentration of pollutants at the model chimney outlet; Q m To detect the total release of flue gas within a preset time period in the model; Q p This represents the total release of flue gas in the tested area over a preset time. Preferably, Q... mTo detect the total emission of flue gas from the model within 1 hour; Q p This represents the total amount of actual flue gas released in the tested area within one hour.

[0068] Optionally, the processing module is further configured to normalize the experimental contamination detection concentration before comparing it with a selected concentration hazard threshold.

[0069] Optionally, determining the hazardous gas diffusion hazard area that matches the selected concentration hazard threshold based on the first diffusion location includes:

[0070] Clustering algorithms are used to correct the first diffusion position, removing the off-center positions in the first diffusion position to obtain the corrected diffusion position;

[0071] The edge lines of the region where the corrected diffusion location is located are drawn using interpolated spline curves to determine the edge position of the region where the corrected diffusion location is located.

[0072] Existing wind tunnel experiments mainly focus on aircraft design parameter testing, experimental setup design, and the impact of buildings on the diffusion characteristics of environmental pollutants. They primarily concentrate on aerodynamics and environmental pollution, without addressing research on hazardous gas diffusion areas. In this embodiment, the wind tunnel experiment, due to its high accuracy and repeatability, can be used to effectively determine the concentration distribution and influence distance of hazardous gases under different meteorological conditions and complex terrain.

[0073] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0074] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0075] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A method of measuring a hazardous gas diffusion hazard area, characterized by, The determination method comprises: Under pollution source release conditions, obtaining pollution experimental detection concentrations of set detection points in a wind tunnel under the action of different wind directions, wherein a detection model corresponding to actual topographic features of a region to be detected is arranged in the wind tunnel; the set detection points are uniformly arranged between a flue gas release point and a boundary of the detection model; Comparing the obtained experimental detection concentrations with selected concentration hazard threshold values respectively, and taking a position of a set detection point corresponding to an experimental detection concentration matched with a selected concentration hazard threshold value as a first diffusion position; wherein, The experimental detection concentration is matched with the selected concentration hazard threshold value in the following manner: According to the selected experimental detection concentration, an actual detection concentration of the actual topographic features of the region to be detected corresponding to the selected experimental detection concentration is obtained by using a corresponding relationship between the experimental detection concentration and the actual detection concentration of the actual topographic features of the region to be detected, and if the actual detection concentration is equal to the selected concentration hazard threshold value, it is determined that the experimental detection concentration corresponding to the actual detection concentration is matched with the selected concentration hazard threshold value; Before comparing the experimental detection concentration with the selected concentration hazard threshold value, the determination method further comprises: normalizing the experimental detection concentration; According to the first diffusion position, a dangerous gas diffusion hazard region matched with the selected concentration hazard threshold value is determined; wherein, The dangerous gas diffusion hazard region matched with the selected concentration hazard threshold value according to the first diffusion position comprises: correcting the first diffusion position by using a clustering algorithm to remove deviated positions in the first diffusion position, to obtain a corrected diffusion position; and drawing an edge line of a region where the corrected diffusion position is located by using an interpolation spline curve on edge points of the region, to determine an edge position of the region where the corrected diffusion position is located.

2. The assay method according to claim 1, characterized by The corresponding relationship between the experimental detection concentration and the actual detection concentration of the actual topographic features of the region to be detected is: C p is the actual detection concentration of the actual terrain characteristics of the area to be tested; C m is the experimental detection concentration; u p is the actual prototype gas diffusion characteristic velocity of the area to be tested; u m is the characteristic velocity of gas diffusion in the area where the detection model is located; σ ym is the horizontal diffusion parameter of the downwind of the detection model at a distance x from the leakage source in the model; σ yp is the actual horizontal diffusion parameter of the downwind of the area to be tested at a distance x from the leakage source in the model; σz m is the vertical diffusion parameter of the downwind of the model at a distance x from the leakage source in the model; σz p is the actual vertical diffusion parameter of the downwind of the area to be tested at a distance x from the prototype leakage source; C Op is the actual chimney pollutant volume concentration in the area to be tested; C Om is the chimney pollutant volume concentration of the detection model; Q m is the total release amount of the detection model flue gas within a predetermined time; Q p is the actual total release amount of the area to be tested flue gas within a predetermined time.

3. A hazardous gas diffusion hazard area measurement system characterized by, The determination system comprises: An acquisition module, configured to acquire pollution experimental detection concentrations of set detection points in a wind tunnel under the action of different wind directions under pollution source release conditions, wherein a detection model corresponding to actual topographic features of a region to be detected is arranged in the wind tunnel; A processing module, configured to compare the acquired experimental detection concentrations with selected concentration hazard threshold values respectively, take a position of a set detection point corresponding to an experimental detection concentration matched with a selected concentration hazard threshold value as a first diffusion position, and determine a dangerous gas diffusion hazard region matched with the selected concentration hazard threshold value according to the first diffusion position; wherein, The processing module determines that the experimental detection concentration is matched with the selected concentration hazard threshold value in the following manner: according to the selected experimental detection concentration, an actual detection concentration of the actual topographic features of the region to be detected corresponding to the selected experimental detection concentration is obtained by using a corresponding relationship between the experimental detection concentration and the actual detection concentration of the actual topographic features of the region to be detected, and if the actual detection concentration is equal to the selected concentration hazard threshold value, it is determined that the experimental detection concentration corresponding to the actual detection concentration is matched with the selected concentration hazard threshold value; The processing module is further configured to normalize the experimental detection concentration before comparing the experimental detection concentration with the selected concentration hazard threshold value; The determination of the dangerous gas diffusion hazard area matched with the selected concentration hazard threshold value according to the first diffusion position comprises: The first diffusion position is corrected by using a clustering algorithm to remove deviated positions in the first diffusion position, to obtain a corrected diffusion position; An edge line is drawn by using an interpolation spline curve on edge points of a region where the corrected diffusion position is located, to determine an edge position of the region where the corrected diffusion position is located.

4. The assay system of claim 3, characterized in that, The corresponding relationship between the experimental detection concentration and the actual detection concentration of the actual terrain feature of the to-be-detected region is: C p is the actual detection concentration of the actual terrain characteristics of the area to be tested; C m is the experimental detection concentration; u p is the actual prototype gas diffusion characteristic velocity of the area to be tested; u m is the characteristic velocity of gas diffusion in the area where the detection model is located; σ ym is the horizontal diffusion parameter of the downwind of the detection model at a distance x from the leakage source in the model; σ yp is the actual horizontal diffusion parameter of the downwind of the area to be tested at a distance x from the leakage source in the model; σz m is the vertical diffusion parameter of the downwind of the model at a distance x from the leakage source in the model; σz p is the actual vertical diffusion parameter of the downwind of the area to be tested at a distance x from the prototype leakage source; C Op is the actual stack pollutant volume concentration in the area to be tested; C Om is the stack pollutant volume concentration of the detection model; Q m is the total release amount of the detection model flue gas within a predetermined time; Q p is the actual total release amount of the area to be tested flue gas within a predetermined time.

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