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室内天然气意外泄漏后极易引起火灾爆炸事故,为避免或减少其事故的发生,得到泄漏后气体扩散规律及爆炸危险浓度分布状况,利用Fluent软件对某12 m×7 m厂房在不同泄漏孔径下泄漏扩散情况进行了数值模拟。分析风速为1 m/s时,泄漏孔径对甲烷气体扩散的影响,并将燃气管道泄漏速率的模拟结果与理论预测值进行对比分析。结果表明:所建立的数学模型和设置参数是合理的;在不同泄漏孔径下,监测受限空间内5个不同点气体分布状况,得出在风速和壁面的影响下,排气扇附近相对较危险,窗户下方相对较安全。
In order to avoid or reduce the occurrence of accidents, the rules of gas diffusion and the concentration distribution of explosion danger are obtained after accidental leakage of indoor natural gas. By using Fluent software, a 12 m × 7 m plant under different leakage apertures The leakage spread was numerically simulated. When the wind speed is 1 m / s, the influence of the leakage aperture on the methane gas diffusion is analyzed. The simulation results of gas pipeline leakage rate are compared with the theoretical predictions. The results show that the mathematical model and setting parameters are reasonable. Under different leakage apertures, the gas distribution in five different points in the confined space is monitored. It is concluded that under the influence of wind speed and wall, Danger, the windows below are relatively safe.