基于绝热火焰温度法的掺氢天然气爆炸下限计算模型  

Explosion limit calculation model of hydrogen-doped natural gas based on adiabatic flame temperature method

作　　者：安国钰 徐宁 熊小琴 An Guoyu;Xu Ning;Xiong Xiaoqin(College of Engineering,China University of Petroleum,Xinjiang Karamay 834000,China)

机构地区：[1]中国石油大学工学院,新疆克拉玛依834000

出　　处：《消防科学与技术》2023年第12期1651-1655,1693,共6页Fire Science and Technology

基　　金：中国石油大学(北京)克拉玛依校区科研启动项目(KL01JB20230008)。

摘　　要：本文分析了管输泄漏条件下掺氢天然气爆炸下限(LEL)的影响因素,基于贫燃料化学反应式和燃烧过程中的热力学平衡,依靠爆炸下限处绝热火焰温度法建立了针对掺氢天然气的多元可燃气体爆炸下限计算模型。结果表明,气体组分对爆炸下限的影响较大,而在管输泄漏过程中,常温条件下环境因素对掺氢天然气爆炸下限的影响可忽略,建立的模型在计算N_(2)等惰性气体含量较低的含氢可燃性气体爆炸下限时,相对误差均在5%以内,计算精度高于Le Chaterlier公式及其改进方法,满足工程需要,为管输掺氢天然气泄漏爆炸事故预防提供参考。The influence factors of the lower explosive limit(LEL)of hydrogen-doped natural gas under pipeline leakage condition are analyzed.Based on the chemical reaction formula of lean fuel and the thermodynamic equilibrium in the combustion process,the calculation model of the lower explosive limit of multiple combustible gases for hydrogen-doped natural gas was established by using the adiabatic flame temperature method at the lower explosive limit.The results show that the influence of gas components on the lower explosive limit is great,while the influence of environmental factors on the lower explosive limit of hydrogen-doped natural gas under pipeline leakage condition can be ignored at normal temperature.When the model calculated the lower explosive limit of hydrogen-containing flammable gases with low inert gas content such as N_(2),the relative error of the model was all within 5%.The calculation accuracy is higher than Le Chaterlier formula and its improved method,which can meet the engineering needs and provide reference for the prevention of leakage and explosion accidents of hydrogen-doped natural gas in pipeline transportation.

关 键 词：掺氢天然气 绝热火焰温度法 爆炸下限 计算模型 

分 类 号：X932[环境科学与工程—安全科学] TE88[石油与天然气工程—油气储运工程]