基于Flacs的化工装置硫化氢泄漏事故后果研究

Consequence Analysis of Hydrogen Sulfide Leakage Accident from Chemical Installation:a Flacs Based Approach

运用挪威Gexcon Flacs软件对某石化厂区硫黄回收装置酸性气分液罐泄漏事故进行模拟研究,通过模拟结果分析不同因素对硫化氢泄漏事故后果严重程度的影响,结果表明:泄漏方向对扩散影响最为显著,水平泄漏扩散浓度明显高于垂直泄漏,且气云核心更加接近泄漏源;泄漏孔径直接影响事故严重程度;风速直接作用于事故演化速度和影响范围;泄漏高度越高,硫化氢气云落地距离越远,对泄漏事故的监测有一定影响。该结果对情景构建工作中最坏事故场景的确定具有一定的指导意义。

In order accidents, Gexcon to study the severity of H2S leakage Flacs software was used to simu- late hydrogen sulfide Leakage from a sulfide recycle installation by implementing a 3D Computational Flu- id Dynamics（CFD） model without any obstacles. Pa- rameters including leakage directions, leakage heights, wind speed and leakage hole sizes werestud- ied. The results showed that leakage direction was the determining factor for the severity and diffusion area of hydrogen sulfide leakage accident in chemical plant. The H2S concentration in a horizontal leakage was much higher than that in avertieal leakage, andthe area of thehighest concentration wascloser to leakage source in a horizontal leakage. As the leakage height increased, hydrogen sulfide gas cloud felho the ground in longer distance which made a difference to H2S detector arrangement. Wind speed mainly affect- eddiffusion distance. Higher wind speed led to longer diffusion distance. In situations with relatively higher wind speed, gas dispersed quickly along and perpen- dicular to the wind direction and concentration of dis- persion cloud decreased slightly. The concentration of hydrogen sulfide gas cloud on the ground increased remarkably with the leak hole size. The study result has guiding significance nt in scene construction worst ac- rescue.