化工区苯污染物低度泄漏在周边居民区扩散的CFD模拟

CFD Simulations for Dispersion of Low-level Leakage of Benzene from Chemical Industrial Zone over the Surrounding Residential Areas

利用FLUENT软件模拟了青岛市某化工区苯污染物低度泄漏在周边居民区的扩散。模拟结果表明:苯污染物在居民区上游主要沿地表扩散,扩散至居民区后主要在居民区上层空间扩散;居民区建筑物对苯污染物有阻挡和分流作用;受"峡谷"效应影响,苯污染物在与风向平行街区内的浓度较低;居民区背风区产生了速度亏损、涡旋及建筑物下洗现象,导致苯污染物浓度在居民区背风区较高;在与风向垂直的2个街区内,距化工厂较近的街区浓度较小,距化工厂较远的街区浓度反而较大。

Using FLUNNT software,the dispersion of low-level leakage of benzene from a chemical industrial zone of Qingdao over the surrounding residential areas is simulated.Simulation results show that the benzene pollutants mainly spread along the ground surface in the upstream of residential areas,and then disperse over the upper space of the residential areas.Also the residential buildings have effects of blockage and diversion on the benzene pollutants.By the influence of ＂canyon＂ of the streets parallel with the wind direction,the concentration of benzene pollutants in such streets is lower.In the leeward of residential areas,the phenomena of velocity loss,vortex and building downwash were observed,which resulted in a higher concentration of benzene pollutants in the leeward areas;in the areas of the two streets perpendicular to the wind direction,the street closer to the chemical industrial zone has a smaller concentration of benzene pollutants,while the farther one has a higher concentration of benzene pollutants.