Abstract: Currently natural gas as a clean energy has been widely used as it mainly relies on natural gas transportation pipeline transportation, so the study of the natural gas pipeline leak is particularly necessary.After the leakage of the natural gas pipeline incident, the gas diffusion range is affected by the atmospheric conditions of the environment, hence ALOHA software is used to analyze the affected hazardous range based on the Gaussian Diffusion Model.Through the simulation analysis of the ALOHA software, it was found out that temperature, wind speed, humidity and atmospheric stability are the influencing factors to the natural gas pipeline leakage.In conclusion, the result showed that the formulas of the ALOHA software is reliable.The rise of temperature will increase the hazardous range, the increase of wind speed and the decrease of atmospheric stability will shrink the hazardous range, while the humidity has no impact on the hazardous range.

Key words: natural gas, ALOHA, atmospheric environment, simulation, diffusion, safety

摘要： 目前天然气作为清洁能源得到了广泛的应用,同时天然气的输送主要依靠管道运输,所以对天然气管道的泄漏研究显得尤为必要。当天然气管道发生泄漏后,天然气的扩散范围会受到大气环境的影响,为此本文选用基于高斯扩散模型的ALOHA软件研究了不同大气环境下天然气管道扩散的危险范围。为了验证软件模拟结果的可靠性,将软件模拟结果与公式计算值进行对比。通过ALOHA软件对不同大气环境下天然气管道泄漏后的危险区域进行模拟分析,得出大气环境中温度、风速、湿度、大气稳定度对天然气管道泄漏的影响。结果表明,ALOHA软件的计算结果是可靠的,大气温度的增加会增大危险范围,风速的加快有利于危险范围的缩小,大气越不稳定危险范围越小,湿度对于危险范围基本没有影响。

关键词: 天然气, ALOHA软件, 大气环境, 模拟, 扩散, 安全