Vapor cloud explosion disaster damage assessment method

A vapor cloud explosion and gas explosion technology, applied in the field of explosion accident analysis, can solve problems such as the inability to evaluate the shock wave distance

Pending Publication Date: 2022-08-05
杭州立方控股股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For example, CN201710674461.0 "Evaluation Method for Combustible Vapor Cloud Explosion" introduces an evaluation method that can calculate the far-field explosion shock wave value by establishing a three-dimensional physical model, but this method cannot evaluate the distance that the shock wave can reach, that is, the explosion spread range , so it is an urgent problem to study and simulate the vapor cloud explosion of flammable gas or vapor in the process of production, storage and transportation, and to evaluate the shock wave value and the scope of the affected area.

Method used

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  • Vapor cloud explosion disaster damage assessment method
  • Vapor cloud explosion disaster damage assessment method
  • Vapor cloud explosion disaster damage assessment method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A vapor cloud explosion disaster assessment method, comprising the following steps:

[0044] Step 1. Assuming that the vapor cloud is hemispherical, the center is ignited, and the flame propagates at a constant speed, the TNO multi-energy method is used to predict the explosion energy;

[0045] Step 1.1, calculate the volume Vc of the vapor cloud, the calculation formula is as follows

[0046] V c =Q ex / (ρ×c s )

[0047] In the formula: V c is the volume of the vapor cloud, in m 3 ;Q ex is the mass of the burning substance, in kg; ρ is the density of the vapor cloud, in kg / m 3 , c s is the volume fraction of fuel mixed with air.

[0048] Step 1.2. Calculate the combustion energy E of the explosion source 0 ,Calculated as follows;

[0049] E 0 =V c ×H c

[0050] In the formula: E 0 is the total energy released by the explosion source, MJ; H c is the combustion heat of the mixture of hydrocarbon and air, and its calorific value is usually taken as 3.5MJ / ...

Embodiment 2

[0062] see figure 1 , a vapor cloud explosion damage assessment method, including the following steps:

[0063] Step 1. Assuming that the vapor cloud is hemispherical, the center is ignited, and the flame propagates at a constant speed, the TNO multi-energy method is used to predict the explosion energy;

[0064] Step 1.1, calculate the volume Vc of the vapor cloud, the calculation formula is as follows

[0065] V c =Q ex / (ρ×c s )

[0066] In the formula: V c is the volume of the vapor cloud, in m 3 ;Q ex is the mass of the burning substance, in kg; ρ is the density of the vapor cloud, in kg / m 3 , c s is the volume fraction of fuel mixed with air.

[0067] Step 1.2. Calculate the combustion energy E of the explosion source 0 ,Calculated as follows;

[0068] E 0 =V c ×H c

[0069] In the formula: E 0 is the total energy released by the explosion source, MJ; H c is the combustion heat of the mixture of hydrocarbon and air, and its calorific value is usually ta...

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Abstract

The invention discloses a steam cloud explosion disaster damage assessment method, which is characterized in that a disaster damage range is estimated through an explosion intensity curve and an influence degree, explosion crest value lateral overpressure under different distances can be quickly acquired, personnel injury and building damage are quantitatively assessed, personnel are timely evacuated, life and property loss caused by accidents is minimized, and the disaster damage assessment method has the advantages of high safety and high reliability. And the distance between the target position and the center of the gas explosion source can be calculated through the lateral overpressure of the explosion peak value, and the explosion wave and range can be evaluated.

Description

technical field [0001] The invention relates to the field of explosion accident analysis, in particular to a vapor cloud explosion disaster damage assessment method. Background technique [0002] Flammable gases or vapors are often involved in the production, transportation, and storage processes of petrochemical, energy and other industries. When a large amount of flammable gas or vapor leaks out, it can be mixed with air to form an explosive vapor cloud. If it encounters a fire source, the vapor cloud will explode. The strong shock wave generated by the explosion of the vapor cloud is the main factor causing injury to personnel and facilities. Once a vapor cloud explosion accident occurs, what is the scope of the accident, how many casualties and property losses are caused, how to evacuate the masses, and carry out emergency rescue and other issues, so it should be predicted and prepared, which will reduce the The loss of life and property caused by the accident and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F113/08G06F119/08
CPCG06F30/28G06F2113/08G06F2119/08Y02A90/10
Inventor 周林健陈欣鲁志超樊轩
Owner 杭州立方控股股份有限公司
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