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Method for determining leakage pollution range of hazardous chemical substance

A determination method and technology for hazardous chemicals, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as non-existence and inability to determine the range of steam clouds, and achieve easy to master, high calculation accuracy, and data visualization. high degree of effect

Inactive Publication Date: 2019-12-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] This method is mainly calculated for the leakage of oil products on land, and cannot determine the range of vapor clouds formed by the volatilization of oil products
[0010] It can be seen that there is no method for determining the leakage area of ​​hazardous chemicals and the range of the formed vapor cloud in the prior art. Therefore, it is necessary to develop a corresponding calculation method for this problem

Method used

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  • Method for determining leakage pollution range of hazardous chemical substance
  • Method for determining leakage pollution range of hazardous chemical substance
  • Method for determining leakage pollution range of hazardous chemical substance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for determining the scope of pollution from leakage of hazardous chemicals, comprising the following steps:

[0041] s1. Determine the simulation scenario, and obtain the meteorological and hydrological information, geographical feature information and leakage source information of the area where the leakage accident occurred.

[0042] Among them, the meteorological and hydrological information includes wind speed, wind direction, air pressure, water flow distribution and water flow velocity.

[0043] Wherein, the geographic feature information includes a contour map.

[0044] Among them, the leakage source information includes equipment or pipeline operating parameters, design parameters and physical parameters of the leakage material.

[0045] s2. Establish a three-dimensional geometric model of the area near the leakage source and perform grid division.

[0046] The purpose of grid division is to make the model into a finite element. After the grid is divi...

Embodiment 2

[0058] This embodiment 2 describes a method for determining the scope of leakage of hazardous chemicals. Except for the following technical features that are different from the above-mentioned embodiment 1, other technical features of this method can refer to the above-mentioned embodiment 1.

[0059] This embodiment 2 also provides the basic principle of grid division in step 2, as follows:

[0060] If the geometric shape of the 3D geometric model is relatively regular, select the structured grid;

[0061] If the geometric shape of the 3D geometric model is irregular, the structured grid is divided into blocks or the unstructured grid is used as a whole.

[0062] The benefits of the above meshing are:

[0063] When the geometric shape is relatively regular, it can be divided into structured grid or unstructured grid. Compared with unstructured grid, structured grid has faster calculation speed and fewer grids.

[0064] However, the division of irregularly shaped geometric mo...

Embodiment 3

[0066] This embodiment 3 describes a method for determining the scope of leakage of hazardous chemicals. Except for the following technical features that are different from the above-mentioned embodiment 1 or 2, other technical features of this method can refer to the above-mentioned embodiment 1 or 2.

[0067] In this embodiment 3, in step s3, after importing the mesh into the fluid flow module in the finite element analysis software, it is necessary to check the quality of the mesh. Negative volumes cannot appear, and if so, re-mesh to ensure the mesh quality The quality meets the requirements.

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Abstract

The invention discloses a method for determining the leakage pollution range of a hazardous chemical substance, and the method comprises the following steps: s1, determining a simulation scene, and obtaining the meteorological and hydrological information, geographic feature information and leakage source information of a leakage accident generation region; s2, establishing a three-dimensional geometric model of an area near the leakage source, and performing mesh generation; s3, importing the grid into a fluid flow module in finite element analysis software; s4, setting material characteristics and boundary conditions in finite element analysis software according to the information acquired in the step s1, meanwhile, judging whether the leaked substances have phase change or not, and setting an inter-phase mass transfer model according to the phase change type; s5, selecting an appropriate convergence condition and a sub-relaxation factor, calculating a step length, and carrying out numerical calculation; and s6, after calculation is finished, analyzing a result to obtain concentration field distribution, diffusion velocity field distribution and diffusion path data of the leakedsubstances. According to the method, the diffusion ranges of the liquid-phase hazardous chemical substance and the vapor cloud thereof can be determined at the same time, and a hazardous chemical substance concentration distribution cloud chart is provided.

Description

technical field [0001] The invention belongs to the technical field of emergency response to hazardous chemical accidents, in particular to the field of measuring and calculating the leakage pollution range of hazardous chemicals by means of computational fluid dynamics (CFD), and in particular to a method for determining the leakage pollution range of hazardous chemicals. Background technique [0002] There are a large number of hazardous chemicals in the petrochemical industry, and these hazardous chemicals are at risk of leakage accidents during production, transportation, storage and use. If hazardous chemicals are extremely volatile or transported or stored in a pressurized, low-temperature form, once leaked, a vapor cloud will be formed, and fire and explosion accidents may occur, causing huge casualties and property losses. In addition, most hazardous chemicals have certain toxicity, causing casualties and environmental pollution at the same time. [0003] After the ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 杨帅赵桂利姜春雨赵祥迪王正袁纪武
Owner CHINA PETROLEUM & CHEM CORP
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