不同大气稳定度下有毒气体泄漏的扩散范围研究

Study on the Diffusion Range of Toxic Gas Leakage under Different Atmospheric Stability

利用高斯烟囱模型计算有毒气体扩散浓度,对比研究了在A,F两种极端大气稳定度条件下,NH_3,Cl_2泄漏时的扩散浓度分布场及安全区域划分情况。通过对比发现,在相同计算参数,相同位置点上,NH_3,Cl_2在F条件下的浓度要远大于在A条件下的浓度;从气体扩散方式上看,在A条件下,NH_3,Cl_2均呈椭圆形扩散,而在F条件下,NH_3呈椭圆形扩散,Cl_2呈扇形扩散。研究结果表明大气稳定度的取值对NH_3,Cl_2泄漏扩散的扩散浓度分布场和扩散方式有较大影响。

The Gaussian chimney model was used to calculate the concentration of diffused toxic gases. The dispersion concentration distribution field and safety zone division in NH3 and Cl2 leakage accident were compared under two extreme atmospheric stability conditions of A and F. By the comparative study it is found that in the same calculation parameters and at the same point the concentration of NH3 and Cl2 at F condition is much greater than that A condition. For the pattern of gas diffusion,both NH3 and Cl2 showed elliptical diffusion under A condition; while NH3 showed oval diffusion and Cl2 showed fan-shaped diffusion under F condition. The results indicated that for the leakage diffusion of NH3 and Cl2,their diffusion concentration distribution field and diffusion pattern were greatly influenced by the value of atmospheric stability.