关键词: 含硫天然气, 泄漏扩散, 风速, 障碍物形状 , 数值模拟

Abstract: The numerical simulation study was performed on the sulfurous gas leakage diffusion. The effects of obstacles shape, slope size of obstacles and the distance between leakage hole and obstacles in the calculation region and different wind speeds on leakage diffusion process were analyzed. The hydrogen sulfide component and methane component safety area were simulated in the different conditions. The results showed that under the action of wind, the presence of obstacles changed the motion path of the gas leakage and led the leakage gas to store in front of its surface. The height of leakage gas diffusion was increased and its transmission in horizontal direction was prevented if the obstacle was no slope obstructions(buildings). The horizontal distance of leakage gas diffusion was increased if the obstacle was gradient obstacles(mountain), and the leakage gas started setting down in the protected area after it bypass obstacles when the wind speed was more than a certain speed, causing the safety area reduced.Reducing obstacles slope, light wind could not influence the diffusion of gas, the leakage of gas was surrounded by obstacles and diffused near the ground when the heavy wind came. Increasing obstacles slope, leakage gas diffusion regularity of slope was similar with no obstructions. The suggestion for emergency rescue and safety management of sulfurous gas leakage accident was provided.

Key words: Sulfurous gas, Leakage diffusion, Wind speed, Shape of obstacles, Numerical simulation