融合环境因素的有限空间毒气扩散危害程度分析

为探究环境因素对毒气扩散危害程度的影响,通过对比有限空间内外环境差异,了解气体在有限空间内受力情况,并以传统高斯烟羽模型为基础,考虑扩散气体与有限空间边界碰撞产生的反射作用,建立了适用于有限空间气体扩散的改进高斯烟羽模型。深度剖析有限空间气体扩散环境,挖掘气体扩散主要关联因子,构建风速、地表粗糙度对有限空间气体扩散的影响函数;参照有限空间环境特征,分别设置3种不同风速与2种不同地表粗糙度,推求6种不同环境条件下气体扩散面积,阐明风速与地表粗糙度对有限空间气体扩散的影响程度。结果表明:在单一风速条件下,风速越高,地表粗糙度越低,洞室内H2S气体滞留时间越短,洞室内气体的扩散面积越小;风速越低,地表粗糙度越高,洞室内气体的扩散面积越大。

Influence of environmental factors on poison gas diffusion in limited space

In order to obtain the influential law of environmental factors on poison gas diffusion in limited space, by comparing the difference of the environment inside and outside the limited space, the gas diffusion in limited space is analyzed. Based on the traditional Gaussian plume model and considering the reflection effect of the collision between diffusion gas and space boundary, a new modified Gaussian plume model was put forward. In this model, the gas diffusion environment and main associated factors of gas diffusion in limited space are analyzed in depth, and the influential function of wind speed and surface roughness on gas diffusion in the finite space is constructed. In addition, based on the environmental characteristics of the limited space, three different wind speeds and two different surface roughness were set up to generate the diffusion area of H2S under six different environmental conditions. The calculation results show that the higher the wind speed and the lower the surface roughness, the gas diffusion area of H2S tends to be smaller, the lower the wind speed and the higher the surface roughness, the gas diffusion area of H2S tends to be larger.