Abstract: Jet fire was the most serious accident of pressurized gas pipelines. Weather data of Nanjing and some other cities was taken as an example to study the distribution of wind speed, humidity and air temperature. Distribution functions of all these parameters and relevant coefficients for some cities were brought. Wind direction, leakage area and leakage direction were also analyzed and reasonable distribution functions were supposed. Monte-Carlo method was used to analysis the jet fire hazard of certain pressurized gas pipeline, and the safety distances can be estimated by considering heat radiation damage rules. C#.net was used to develop an analyzing procedure for the jet fire hazard, which was used to estimate the effective distances of a batch of computations pressurized nature gas pipelines with different diameter and internal pressure, and a safety distance confirmation diagram was plotted, the radiation threshold value and the confidence of which were respectively 12.5 kW/m2 and 95％.

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摘要： 喷射火事故是高压可燃气体管道的主要灾害形式, 对南京等地区的气象数据进行分析统计, 得到了影响喷射火事故的风速、大气湿度、大气温度、风向等主要气象因素的分布形式, 同时对风向、泄漏口直径、泄漏口角度等主要影响因素的分布进行了合理假设。采用蒙特卡罗方法对高压可燃气体管道的喷射火灾害进行分析, 结合相应的热辐射破坏准则, 给出了各准则下对应安全间距确定的方法, 采用C #.ne t 对计算过程进行了程序实现, 对不同管径、不同压力的天然气管道进行了大量计算, 给出了临界破坏值12.5 kW/ m2 , 95%置信度时天然气管道对应的安全间距确定图。

关键词: 喷射火 , 蒙特卡罗法 , 热辐射 , 安全间距