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A dynamic approach for evaluating the consequences of toxic gas dispersion in the chemical plants using CFD and evacuation modelling
Journal of Loss Prevention in the Process Industries ( IF 3.5 ) Pub Date : 2020-05-05 , DOI: 10.1016/j.jlp.2020.104156
Jiyun Wang , Xiaoyang Yu , Ruowen Zong

Accidental releases of toxic gas in the chemical plants have caused significant harm to the exposed occupants. To evaluate the consequences of these accidents, a dynamic approach considering the gas dispersion and behavior evacuation modelling has been proposed in this paper. This approach is applied to a hypothetical scenario including an accidental chlorine release in a chemical plant. CFD technique is utilized to calculate the time-varying concentration filed and evacuation modelling is used to obtain the evacuation routes. The exposure concentrations in the evacuation routes are calculated by using the code of data query. The integrated concentration toxic load model and probit model are used to calculate the probability of mortality of each occupant by using the exposure concentrations. Based on this dynamic approach, a new concept of average probability of mortality (APM) has been proposed to quantify the consequences of different accidental scenarios. The results show that APM decreases when the required detection time decreases or emergency evacuation mode is implemented. The impact of the detection time on APM becomes small as the wind speed increases. The effect of emergency evacuation mode is more obvious when the release occurs in an outdoor space.



中文翻译:

使用CFD和疏散模型评估化学工厂中有毒气体扩散后果的动态方法

化工厂中有毒气体的意外释放对暴露的居民造成了重大伤害。为了评估这些事故的后果,本文提出了一种考虑气体扩散和行为疏散模型的动态方法。该方法适用于假设场景,包括化工厂意外释放氯气。利用CFD技术计算时变浓度场,并使用疏散模型获得疏散路线。使用数据查询代码计算疏散路线中的暴露浓度。综合浓度毒物负荷模型和概率模型用于通过使用暴露浓度计算每个乘员的死亡概率。基于这种动态方法,提出了一种平均死亡概率(APM)的新概念,以量化不同意外情况的后果。结果表明,当所需的检测时间减少或实施紧急疏散模式时,APM降低。随着风速的增加,检测时间对APM的影响变小。当释放发生在室外空间时,紧急疏散模式的效果更加明显。

更新日期:2020-05-05
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