Based on the CFD software, making use of components transport models, the control equation of leakage and diffusion of natural gas was established, numerical simulation for leakage of overhead high sulfur natural gas pipeline was carried out, two conditions including steady-state leakage and unsteady-state leakage were studied. Effect of wind speed, gravity, leakage amount, working conditions, transport pressure and other factors on the diffusion process of natural gas after the leakage was analyzed, diffusion law and safe regional cloud of hydrogen sulfide in different working conditions were obtained. Combined with the simulation results, the diffusion law of high sulfur natural gas was analyzed, and effect of different wind speed on the leakage of natural gas was obtained, the simulation results can provide guidance on formulating related emergency plan and safe practice for oil and natural gas industry.%以计算流体力学软件为基础，利用组分输运模型，建立了天然气泄漏扩散控制方程，对高含硫架空天然气管道泄漏数值模拟，研究稳态泄漏和非稳态泄漏两种情况。分析了风速、重力、泄漏量、工况、输送压力等因素对天然气泄漏后扩散过程的影响，得到了硫化氢在不同工况下的扩散规律及安全区域云图。结合模拟结果，分析了高含硫天然气的泄漏扩散规律，得到了不同风速条件对架空天然气管道泄漏的影响，且其模拟结果可以为石油天然气行业制定相关应急预案及制定安全规章提供指导意义。
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