有毒重气泄漏安全距离数值方法

以有毒重气硫化氢气体为对象,利用非正常排放扩散模型计算气体泄漏时地表扩散浓度场,对比研究两种极端大气稳定度条件下浓度场分布规律和特征,确定了各自情况下的安全距离。研究结果表明,大气稳定度对H2S扩散后果影响大,F条件下的浓度值相对较大但其扩散范围较小;该模型能定量地描述气体扩散地面浓度分布场,能快捷和科学地预测浓度和源强、风速、大气稳定度以及时间空间等的关系。笔者所用的方法克服了现实情况中安全距离设定单一的弊端,对有毒重气泄漏安全规划等有指导作用。

Numerical Method of Safety Distance for Poisonous Dense Gaseous Leakage

Concentration field of hydrogen sulfide on ground while releasing wa s computed by diffusion model of abnormal emission. Distribution rule and charac teristic of concentration field under two kinds of uttermost atmospheric stabili ty were investigated contrastively, and each safety distances were achieved. Res ults implied that diffusion result of hydrogen sulfide was influenced greatly by atmosphere stability. Concentration of hydrogen sulfide under F stability was r elatively higher, however, with a narrower diffusion range. The model could desc ribe the concentration field quantitatively, and predict the relationships betwe en concentration and source strength, wind velocity, atmospheric stability, spac e-time and so on. The method could overcome the defect of single supposition in safety distance in reality, and provide guidance in safety planning for poisono us dense gaseous leakage.