基于CFD的氨泄漏扩散危险性定量分析

Quantitative hazard analysis of ammonia leakage and diffusion based on CFD

利用高斯烟羽数学模型计算分析氨泄漏扩散的规律和危害性,得到下风向氨气的浓度时空分布和对人员不同危害程度的影响区域。利用FDS模拟研究氨泄漏扩散浓度随时空的变化规律,并与理论计算对比,发现两者整体趋势基本吻合,FDS模拟氨泄漏扩散过程具有一定的可行性。数值模拟发现氨气浓度水平方向分布呈近似蒲扇型,风力有利于氨的扩散;同时得到致死区、重伤区以及致伤区的扩散距离分别为355、602、1 851m;各区域整体危险来临时间分别为826、1 512、4 158s。

With Gaussian plume model calculation and analysis of ammonia leakage diffusion patterns and dangers, spatial distribution of ammonia concentration and the effects of harmful levels of different distances was obtained. Using FDS simulation study of ammonia leakage and diffusion regularity of concentration change over time, comparison to theoretical calculations, the overall trend was basically familiar with simulation, FDS simulation has some viability. Through computer simulations, it was found that ammonia distribution in the horizontal direc- tion was similar to fan and wind was in favor of diffusion. Besides, severe and moderate hazards as well as mildly harmful area of diffusion distance was 355 m, 602 m, 1 851 m; the overall regional risk time was 826 s, 1 512 s, 4 158 s.