Impacts of Wind Speed and Leakage Height on Chlorine Leakage Diffusion

Simulation for safety analysis of the leakage of toxic and harmful gas diffusion accident is beneficial for emergency treatment or pre-treatment. Based on the Fluent software substances transmission platform, in this paper, a chlorine gas leak and diffusion model established in the obstacle environment. Numerical simulation mainly considered ambient wind speed and leakage height. In the mean time, from the lethal concentration and safety standards perspective, region analysis of chlorine gas diffusion has been discussed. The results show that, the molar concentration of chlorine tends to saturation value under the conditions of static wind or with the wind speed of 3.6m/s along downwind of the buildings, and the value of the former is larger than the latter. The molar concentration of chlorine at monitoring points along downwind of the buildings, increases at first and then decreases in the case of wind speed of 10m/s; under the condition of downwind of the building and from the ground 2m height, the value of molar concentration of chlorine is at the maximum with static wind, but in contrast, the value is at the minimum with wind velocity of 10m/s, and at medium with wind velocity of 3.6m/s in between. Comparing leakage height at 5m to 10m in the three wind speed types, similarly in each type, chlorine leakage arrived earlier to the ground at 5m than at 10m, and the molar concentration of chlorine declined along the downwind of buildings faster than at 10m.