Explosion overpressure evaluation method, device and storage medium

Abstract

An embodiment of the present invention provides an explosion overpressure evaluation method, and the method includes: establishing a plurality of explosion overpressure curve relationship diagrams corresponding to the explosion gas cloud volume and the distance from the explosion source under different explosion source intensities; matching the explosion overpressure curve relationship diagram corresponding to the explosion source intensity according to the explosion source intensity; and obtaining the explosion overpressure at the point through a chart lookup method in the explosion overpressure curve relationship diagram according to the explosion gas cloud volume and the distance from the point to the explosion source. At the same time, an explosion overpressure evaluation device is also provided. The above technical solution of the present invention can avoid the complex calculation process of explosion overpressure, improve the analysis speed, and avoid the large errors brought by the empirical judgment method.

Description

Technical Field

[0001] The present invention relates to the field of safety technology, and in particular, to an explosion overpressure evaluation method, an explosion overpressure evaluation device, and a corresponding storage medium. Background Art

[0002] There are a large number of process units in petrochemical enterprises. When carrying out work such as process layout, risk assessment, and safety protection, it is necessary to calculate their explosion overpressure. The calculation of explosion overpressure is a complex task that requires a large amount of data and complex simulation calculations. It is difficult for general engineering and technical personnel to master, so it is not suitable for the preliminary safety analysis of a large number of units distributed in petrochemical enterprises.

[0003] MEM (Multi-Energy Method) is a typical proportional scaling explosion prediction model. It is a vapor cloud explosion effect prediction model established based on a large number of experiments and numerical studies, and is a method for determining the characteristics of vapor cloud explosion in a confined space. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide an explosion overpressure evaluation method and its device to at least solve the problems of complex calculation and long time consumption in current explosion overpressure evaluation.

[0005] To achieve the above purpose, in the first aspect of the present invention, there is provided an explosion overpressure evaluation method, the method including:

[0006] Establishing a plurality of explosion overpressure curve relationship diagrams corresponding to the explosion gas cloud volume and the distance from the explosion source under different explosion source intensities; matching the explosion overpressure curve relationship diagram corresponding to the explosion source intensity according to the explosion source intensity; and obtaining the explosion overpressure at the point through a chart lookup method in the explosion overpressure curve relationship diagram according to the explosion gas cloud volume and the distance from the point to the explosion source.

[0007] Optionally, the explosion source intensity is divided according to the multi-energy method.

[0008] Optionally, the explosion gas cloud volume is determined according to the combustible gas cloud volume V 燃 and the blocked area volume V 阻 .

[0009] Optionally, the explosion gas cloud volume is the smaller value of the combustible gas cloud volume V 燃 compared with the blocked area volume V 阻 .

[0010] Optionally, the combustible gas cloud volume V 燃 is determined through the following steps:

[0011] If the mass of the combustible gas cloud is obtained, the volume V of the combustible gas cloud is calculated based on the relationship between the mass and density. 燃 ;

[0012] Otherwise, according to the medium type and the operating pressure of the device of the combustible gas cloud, the volume V of the combustible gas cloud is obtained by the chart lookup method. 燃 。

[0013] Optionally, the volume V of the combustible gas cloud obtained by the chart lookup method 燃 , includes:

[0014] Match the corresponding pressure-volume curve relationship diagram according to the medium type of the combustible gas cloud;

[0015] The pressure-volume curve relationship diagram includes the corresponding relationship between the operating pressure of the device and the volume of the combustible gas cloud;

[0016] According to the operating pressure of the device, the volume V of the combustible gas cloud is obtained by the chart lookup method. 燃 。

[0017] Optionally, the volume V of the blockage area 阻 is determined by the following steps:

[0018] Determine the total volume of the device area;

[0019] According to the total volume and the blockage rate, determine the volume V of the blockage area 阻 。

[0020] Optionally, the determination of the total volume of the device area includes:

[0021] Obtain the length and width of the device area;

[0022] Classify the heights of the devices in the device area and calculate the proportion of each classification;

[0023] According to the height and its proportion of each classification, obtain the average height;

[0024] According to the length, width and average height, obtain the total volume of the device area.

[0025] Optionally, the blockage rate takes discrete values.

[0026] Optionally, there is a corresponding relationship between the blockage rate and the explosion source intensity.

[0027] In the second aspect of the present invention, an explosion overpressure evaluation device is further provided, and the device includes: a memory and a processor;

[0028] The memory is used to store program instructions;

[0029] The processor is configured to call the program instructions stored in the memory to implement the aforementioned explosion overpressure evaluation method.

[0030] Optionally, the memory is further configured to store the explosion overpressure curve relationship diagram, which is used to obtain the explosion overpressure at the point by looking up the diagram in the explosion overpressure curve relationship diagram according to the explosion source intensity, the explosion gas cloud volume, and the distance from the point to the explosion source.

[0031] Optionally, the memory is further configured to store the pressure-volume curve relationship diagram, which includes the corresponding relationship between the operating pressure of the device and the combustible gas cloud volume, and is used to obtain the combustible gas cloud volume V by looking up the diagram according to the operating pressure of the device. 燃 。

[0032] Optionally, the device further includes:

[0033] An input device for inputting the conditions for looking up the diagram; and an output device for outputting the results of looking up the diagram.

[0034] In the third aspect of the present invention, a machine-readable storage medium is further provided. Instructions are stored on the machine-readable storage medium, and when it runs on a computer, it causes the computer to execute the aforementioned explosion overpressure evaluation method.

[0035] The above technical solution of the present invention proposes an explosion overpressure rapid quantitative evaluation method and device that can be quickly mastered by general engineering technicians and is suitable for petrochemical plants, which can avoid the complex calculation process of explosion overpressure, improve the analysis speed, and avoid the large errors caused by the empirical judgment method.

[0036] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific embodiments section. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0038] Figure 1 is a flowchart of an explosion overpressure evaluation method provided by an embodiment of the present invention;

[0039] Figure 2 is an explosion overpressure curve relationship diagram with an explosion source intensity S = 5 provided by an alternative embodiment of the present invention;

[0040] Figure 3It is a graph showing the relationship of explosion overpressure curves with an explosion source intensity S = 9 provided by an alternative embodiment of the present invention;

[0041] Figure 4 It is a graph showing the pressure - volume curve relationship of methane and ethane leaking for 10 minutes under the weather condition of 5D provided by an alternative embodiment of the present invention;

[0042] Figure 5 It is a graph showing the pressure - volume curve relationship of propane and butane leaking for 10 minutes under the weather condition of 1.5F provided by an alternative embodiment of the present invention;

[0043] Figure 6 It is a graph showing the pressure - volume curve relationship of hydrogen and ethylene leaking for 10 minutes under different weather conditions provided by an alternative embodiment of the present invention;

[0044] Figure 7 It is a schematic structural diagram of an explosion overpressure evaluation device provided by an alternative embodiment of the present invention; and

[0045] Figure 8 It is a flowchart of the implementation of an explosion overpressure evaluation method provided by an alternative embodiment of the present invention. Detailed Embodiment

[0046] The following further elaborates on the detailed embodiment of the present invention in conjunction with the accompanying drawings. It should be understood that the detailed embodiment described herein is only for the purpose of illustration and explanation of the present invention, and is not intended to limit the present invention.

[0047] In the embodiments of the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are generally used in reference to the directions shown in the drawings or in terms of the vertical, perpendicular or gravitational directions for describing the relative positional relationships of the components.

[0048] Figure 1 It is a flowchart of an explosion overpressure evaluation method provided by an embodiment of the present invention. As Figure 1 shown, an embodiment of the present invention provides an explosion overpressure evaluation method, and the method includes:

[0049] Establishing a plurality of explosion overpressure curve relationship diagrams corresponding to the explosion gas cloud volume and the distance from the explosion source under different explosion source intensities;

[0050] Matching the explosion overpressure curve relationship diagram corresponding to the explosion source intensity according to the explosion source intensity;

[0051] Obtaining the explosion overpressure at the point through the chart - looking method in the explosion overpressure curve relationship diagram according to the explosion gas cloud volume and the distance of the point from the explosion source.

[0052] In this way, the complex calculation process of explosion overpressure can be avoided, the analysis speed can be improved, and the large errors caused by the empirical judgment method can be avoided.

[0053] Specifically, the explosion overpressure at a certain position is related to the following factors: the intensity of the explosion source, the volume of the explosive gas cloud, and the distance between this position and the explosion source. However, the relationship between the factors is relatively complex, so it is difficult for general engineering and technical personnel to master. The method in this embodiment first determines the intensity of the explosion source and obtains an explosion overpressure curve relationship diagram under this explosion source intensity. The curve relationship diagram includes the explosion overpressure corresponding to the volume of the explosive gas cloud and the distance from the explosion source. Through the chart lookup method, the explosion overpressure at a point can be intuitively and accurately determined in the curve relationship diagram, which not only avoids complex calculations but also improves the analysis speed.

[0054] Furthermore, the explosion source intensity is divided according to the multi-energy method.

[0055] The greater the explosion source intensity, the greater the explosion overpressure generated. The explosion source intensity determines the explosion source intensity level S of the device area according to the material composition, the blockage degree of the device area, the degree of restraint, etc. The explosion source intensity level S is divided into 10 levels from S1 to S10 from low to high according to the multi-energy method. The explosion overpressure curve relationship diagram is divided according to this explosion source intensity, which not only conforms to the general specifications in the industry but also improves the matching accuracy.

[0056] Figure 2 It is the explosion overpressure curve relationship diagram with the explosion source intensity S = 5 provided by an optional embodiment of the present invention; Figure 3 It is the explosion overpressure curve relationship diagram with the explosion source intensity S = 9 provided by an optional embodiment of the present invention (only the explosion overpressure curve relationship diagrams with the explosion source intensities S = 5 and S = 9 are shown above. In practice, multiple diagrams with the explosion source intensity S from 1 to 10 should be included for on-site matching according to the explosion source intensity). As Figure 2 or Figure 3 shown, with the volume of the explosive gas cloud as the abscissa and the distance from the explosion source as the ordinate, an explosion overpressure coordinate point can be quickly determined. However, the explosion overpressure value corresponding to this coordinate point needs to be further determined through a reference line. The reference line here is the oblique line labeled 1 - 4 in the figure. Taking Figure 2 the explosion intensity S = 5 as an example, when the determined explosion overpressure coordinate point is exactly on the reference line 1, it corresponds to 5 kPa; if it is on the reference line 2, it corresponds to 10 kPa, and so on. When the explosion overpressure coordinate point is not on the reference line, it needs to be estimated according to the upper and lower reference lines. Through this method, the explosion overpressure value at a certain distance can be quickly obtained.

[0057] In an embodiment of the present invention, the volume of the explosive gas cloud is based on the volume V of the combustible gas cloud 燃 and the volume V of the blocked area阻 Determined. Further, the volume of the explosive gas cloud is the smaller value compared to the volume V of the combustible gas cloud 燃 and the volume V of the blocked area 阻 .

[0058] If the combustible gas cloud formed by the leaked material does not fill the entire blocked area, that is, the volume of the combustible gas cloud is less than the volume of the blocked area, then the volume of the combustible gas cloud in the explosion source is the volume of the vapor cloud actually entering this area; if the volume of the combustible cloud is greater than the volume of the blocked area, then the volume of the combustible gas cloud in the explosion source is the volume of the blocked area. That is, the volume of the combustible gas cloud in the explosion source should be the smaller of the volume of the vapor cloud actually entering this area and the volume of the blocked area. When estimating the volume of the blocked area, the total volume of the device area should be subtracted by the volume occupied by the equipment in this area. Therefore, the volume Vex of the explosive gas cloud is the smaller of the volume V of the combustible gas cloud 燃 and the volume V of the blocked area 阻 . The formula for the volume Vex of the explosive gas cloud is expressed as: Vex = Min(V 燃 , V 阻 ).

[0059] Further, the volume V of the combustible gas cloud 燃 is determined through the following steps:

[0060] If the mass of the combustible gas cloud is obtained, then the volume V of the combustible gas cloud is obtained through the relationship between mass and density 燃 ; otherwise, according to the medium type of the combustible gas cloud and the operating pressure of the device, the volume V of the combustible gas cloud is obtained through the chart method 燃 .

[0061] If the mass of the combustible gas cloud is obtained, then the volume V of the combustible gas cloud 燃 , is calculated through the following formula:

[0062] In the formula: Q ex is the mass of the combustible gas cloud, ρ is the density, and c s is the chemical formula ratio.

[0063] Through calculation, the volumes of combustible gas clouds of six representative media under normal conditions are obtained. The volume of the combustible gas cloud can be estimated with reference to the following scenario parameters:

[0064] Typical media: methane, ethane, propane, butane; hydrogen; ethylene

[0065] Typical wind speed and atmospheric stability: 1.5 m / s, F; 5 m / s, D

[0066] Typical leakage aperture: 50 mm

[0067] Typical leakage time: 10 min

[0068] Typical operating temperature: 30 °C

[0069] Typical operating pressure: 0.5 MPa to 10 MPa

[0070] Under the above scenario parameters, through simulation and calculation, the estimated curve of the combustible gas cloud volume of methane, ethane, propane, and butane at different operating pressures was obtained.

[0071] Figure 4 It is a graph showing the pressure-volume curve relationship of methane and ethane provided by an alternative embodiment of the present invention when leaking for 10 minutes under the weather condition of 5D (i.e., wind speed of 5 m / s and atmospheric stability of D); Figure 5 It is a graph showing the pressure-volume curve relationship of propane and butane provided by an alternative embodiment of the present invention when leaking for 10 minutes under the weather condition of 1.5F (i.e., wind speed of 1.5 m / s and atmospheric stability of F); Figure 6 It is a graph showing the pressure-volume curve relationship of hydrogen and ethylene provided by an alternative embodiment of the present invention when leaking for 10 minutes under different weather conditions; the above includes the leakage curves of six common combustible gases. In actual use scenarios, the values obtained by the chart lookup method need to be appropriately corrected according to the actual on-site conditions.

[0072] The combustible gas cloud volume V is obtained by the chart lookup method in the above-mentioned estimated curve of the combustible gas cloud volume 燃 , including:

[0073] Match the corresponding pressure-volume curve relationship diagram according to the medium type of the combustible gas cloud; due to the different characteristics of each medium, it is necessary to select the curve diagram corresponding to the medium type in the above-mentioned drawings (Appendix Figure 4 -Appendix Figure 6 , and there may be more drawings in the actual scenario) to obtain accurate results.

[0074] The pressure-volume curve relationship diagram contains the corresponding relationship between the operating pressure of the device and the combustible gas cloud volume; according to the operating pressure of the device, the combustible gas cloud volume V is obtained by the chart lookup method 燃 . That is: according to the meteorological conditions on-site, determine the corresponding curve, and then according to the operating pressure and the curve corresponding to the meteorological conditions, find the ordinate corresponding to the abscissa by the chart lookup method, which is the combustible cloud volume V 燃 .

[0075] In an embodiment of the present invention, the volume V of the blocked area 阻 is determined by the following steps:

[0076] Determine the total volume of the device area; determine the volume V of the blocked area according to the total volume and the blockage rate.

[0077] That is, the estimation method is divided into two steps: First, determine the total length, width, height, and corresponding volume of the device area. Second, determine the blockage rate of the device area, and then determine the volume of the blocked area.

[0078] Furthermore, determining the total volume of the device area includes:

[0079] Obtain the length and width of the device area; classify the heights of the devices in the device area and calculate the proportion of each classification; obtain the average height according to the height and its proportion of each classification; and obtain the total volume of the device area according to the length, width, and average height.

[0080] The calculation steps in this embodiment are as follows:

[0081] (1) The length L and width W of the blocked area

[0082] According to the actually measured length L and width W of the device boundary, devices with a distance between different devices less than 20 m can be regarded as a blocked area, and those exceeding 20 m are calculated separately.

[0083] (2) The height H of the blocked area

[0084] Generally, H can be determined according to the overall average height of the device area. If there are multiple types of devices with different heights in the device area, the weighted average height can be referred to for calculating H:

[0085] a. For thin and tall towers, their heights can be ignored when determining the height, but towers with a large floor area such as reaction towers should be considered according to a certain floor area ratio;

[0086] b. According to the height distribution of the devices, first divide them into n height regions, then estimate the proportion of the area occupied by each height region respectively, and then determine the weighted average height. For example:

[0087] The blocked area is mainly composed of 3 height regions: the area occupied by the 40 m high region is about 20%, the 20 m high region is about 60%, and the 10 m high region is about 20%. Then the weighted average height H of this device area should be:

[0088] H = 40×20% + 20×60% + 10×20% = 22 m.

[0089] Therefore, the total volume V of the device area 总 = L×W×H.

[0090] In an embodiment of the present invention, the blockage rate takes discrete values. There is a corresponding relationship between the blockage rate and the explosion source intensity.

[0091] The blockage degree of the device blocked area is divided into 4 levels: severe blockage, high blockage, medium blockage, and low blockage.

[0092] (1) Severe blockage: The light in the middle of the severely blocked area is very dim and requires permanent lighting to work. Average blockage rate = 0.45, and the explosion intensity S is 9 - 10.

[0093] (2) High blockage: The light level is relatively low and requires permanent lighting. Average blockage rate = 0.35, and the explosion intensity S is 7 - 8.

[0094] (3) Medium blockage: The light has good penetrability and does not require continuous permanent lighting. Average blockage rate = 0.25, and the explosion intensity S is 6 - 7.

[0095] (4) Low blockage: Sunlight can often be seen on the ground in the main passage area, and there is a large space between the equipment. Average blockage rate = 0.15, and the explosion intensity S is 4 - 5.

[0096] (5) Blocked area with a roof: It means that more than 80% of the crowded area is blocked by the roof in the vertical direction. The blockage situation of each layer should be evaluated, and the situation with the highest blockage rate should be used in the analysis. At the same time, the leakage situation of all process layers should be considered.

[0097] According to the blockage rate br, calculate the volume of the blocked area: V 阻 = V 总 × (1 - br).

[0098] An embodiment of the present invention also provides an explosion overpressure evaluation device, which includes: a memory and a processor;

[0099] The memory is used to store program instructions;

[0100] The processor is used to call the program instructions stored in the memory to implement the aforementioned explosion overpressure evaluation method. Among them, the processor may include, but is not limited to, a general - purpose processor, a special - purpose processor, a conventional processor, multiple microprocessors, a controller, a microcontroller, an application - specific integrated circuit (ASIC), a field - programmable gate array (FPGA) circuit, any other type of integrated circuit (IC), and a state machine, etc.

[0101] The explosion overpressure evaluation device provided by an embodiment of the present invention, wherein the memory is further configured to store the explosion overpressure curve relationship diagram, and the explosion overpressure curve relationship diagram is used to obtain the explosion overpressure at the point through a chart - looking method in the explosion overpressure curve relationship diagram according to the explosion source intensity, the explosion gas cloud volume, and the distance from the point to the explosion source.

[0102] Another embodiment of the present invention also provides an explosion overpressure evaluation device, wherein the memory is further configured to store the pressure-volume curve relationship diagram, which includes the corresponding relationship between the operating pressure of the device and the volume of the combustible gas cloud, and is used to obtain the volume V of the combustible gas cloud by means of chart lookup according to the operating pressure of the device. 燃 。

[0103] The functions and usage methods of the explosion overpressure curve relationship diagram and the pressure-volume curve relationship diagram stored above are as described above, and will not be repeated here.

[0104] Figure 7 is a schematic structural diagram of an explosion overpressure evaluation device provided by an alternative embodiment of the present invention, as Figure 7 shown: In addition to including the aforementioned explosion overpressure evaluation device, this device further includes: an input device for inputting the conditions for chart lookup; and an output device for outputting the results of chart lookup.

[0105] The input device here can be an input device such as a keyboard, a mouse, a touch screen, etc., and the output device can be a device capable of displaying results such as a display, a printer, a mobile screen, etc. Considering the portability on site, the input device and the output device here can be integrated on a smart terminal, which has a processor and a memory and can run the aforementioned explosion overpressure evaluation method.

[0106] Figure 8 is an implementation flowchart of an explosion overpressure evaluation method provided by an alternative embodiment of the present invention, as Figure 8 shown. When the volume of the combustible gas cloud and the distance between the building and the explosion source are determined, the explosion overpressure value generated by a petrochemical device on a certain building can be directly determined according to the Figure 8 process, and the specific steps are as follows:

[0107] (1) Calculate the gas cloud volume according to the explosive substance and meteorological conditions;

[0108] (2) Calculate the blocked area volume according to the volume of the device area and the blockage rate of the device area;

[0109] (3) Select the smaller value between the gas cloud volume and the blocked area volume and determine it as the explosion gas cloud volume;

[0110] (4) Judge the explosion source intensity and the distance from the explosion source;

[0111] (5) Determine the explosion overpressure according to the explosion cloud volume, the explosion source intensity and the distance from the explosion source.

[0112] In an embodiment of the present invention, a machine-readable storage medium is further provided. Instructions are stored on the machine-readable storage medium, and when it runs on a computer, it causes the computer to execute the aforementioned explosion overpressure evaluation method.

[0113] Through the above technical solutions of the present invention, on-site personnel can quickly calculate the explosion overpressure at a certain point according to the on-site conditions, which can avoid the complex calculation process of explosion overpressure, improve the analysis speed, and avoid the large errors brought by the empirical judgment method.

[0114] The optional embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the technical concept scope 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.

[0115] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not separately describe various possible combination methods.

[0116] Those skilled in the art can understand that all or part of the steps in the methods for implementing the above embodiments can be completed by instructing relevant hardware through a program. The program is stored in a storage medium, including several instructions to cause a single-chip microcomputer, a chip, or a processor to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0117] In addition, any combination can be made between various different embodiments of the present invention, as long as it does not violate the idea of the embodiments of the present invention, and it should also be regarded as the content disclosed in the embodiments of the present invention.

Claims

1. An explosion overpressure assessment method, characterized in that, The method includes: establishing a plurality of explosion overpressure curve relationship diagrams corresponding to the explosion gas cloud volume and the explosion source distance under different explosion source intensities; matching the explosion overpressure curve relationship diagram corresponding to the explosion source intensity according to the explosion source intensity; obtaining the explosion overpressure at the point by means of chart lookup in the explosion overpressure curve relationship diagram according to the explosion gas cloud volume and the distance from the point to the explosion source; The volume of the explosive gas cloud is determined according to the volume V of the combustible gas cloud 燃 and the volume V of the blocking area 阻 ; The volume V of the blocked area 阻 is determined by the following steps: determining the total volume of the device area; determining the volume V of the blocked area according to the total volume and the blockage rate of the device area 阻 ; There is a corresponding relationship between the blockage rate and the explosion source intensity.

2. The method according to claim 1, characterized in that, The explosion source intensity is divided according to the multi-energy method.

3. The method according to claim 1, wherein The volume of the explosive gas cloud is the smaller value compared with the volume V of the combustible gas cloud 燃 and the volume V 阻 of the blockage area 4. The method according to claim 1, characterized in that, The volume V of the combustible gas cloud 燃 is determined by the following steps: If the mass of the combustible gas cloud is obtained, the volume V of the combustible gas cloud is obtained from the relationship between the mass and the density 燃 ; Otherwise, according to the medium type of the combustible gas cloud and the operating pressure of the device, the volume V of the combustible gas cloud is obtained by the chart lookup method 燃 .

5. The method according to claim 4, wherein The combustible gas cloud volume V obtained by the chart lookup method 燃 , includes: matching a corresponding pressure-volume curve relationship diagram according to the medium type of the combustible gas cloud; The pressure-volume curve relationship diagram includes the corresponding relationship between the operating pressure of the device and the volume of the combustible gas cloud; According to the operating pressure of the device, the volume V of the combustible gas cloud is obtained by the method of looking up the graph 燃 .

6. The method according to claim 1, characterized in that The determination of the total volume of the device area includes: obtaining the length and width of the device area; classifying the heights of the devices in the device area and calculating the proportion of each classification; obtaining the average height according to the height and its proportion of each classification; obtaining the total volume of the device area according to the length, width and average height.

7. The method according to claim 1, wherein The blockage rate takes discrete values.

8. The method according to claim 7, wherein There is a corresponding relationship between the blockage rate and the explosion source intensity.

9. An explosion overpressure evaluation device, characterized in that, The device includes: a memory and a processor; The memory is used for storing program instructions; The processor is used for calling the program instructions stored in the memory to implement the explosion overpressure evaluation method according to any one of claims 1 to 8.

10. The device according to claim 9, wherein The memory is further configured to store the explosion overpressure curve relationship diagram; The explosion overpressure curve relationship diagram is used for obtaining the explosion overpressure at the point by means of chart lookup in the explosion overpressure curve relationship diagram according to the explosion source intensity, the explosion gas cloud volume and the distance from the point to the explosion source.

11. The device according to claim 10, characterized in that, The memory is further configured to store the pressure-volume curve relationship diagram; The pressure-volume curve relationship diagram includes the corresponding relationship between the operating pressure of the device and the volume of the combustible gas cloud, and is used to obtain the volume V of the combustible gas cloud by means of chart lookup according to the operating pressure of the device 燃 .

12. The device according to any one of claims 9 to 11, characterized in that, The device further includes: an input device for inputting the conditions for chart lookup; and an output device for outputting the result of chart lookup.

13. A machine-readable storage medium, characterized in that, Instructions are stored on the machine-readable storage medium, and when they run on a computer, the computer is caused to execute the explosion overpressure evaluation method according to any one of claims 1 to 8.

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