家庭厨房内不同比例混氢天然气泄漏扩散研究  

Study on leakage and diffusion of hydrogen-blended natural gas with different ratios in home kitchen

作　　者：胡赛涛 张圣柱[2] 王旭 李云涛 HU Saitao;ZHANG Shengzhu;WANG Xu;LI Yuntao(College of Safety and Ocean Engineering,China University of Petroleum(Beijing),Beijing 102249,China;China Academy of Safety Science and Technology,Beijing 100012,China)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京102249 [2]中国安全生产科学研究院,北京100012

出　　处：《中国安全生产科学技术》2024年第2期90-96,共7页Journal of Safety Science and Technology

基　　金：国家重点研发计划项目(2022YFC3070100);中国安全生产科学研究院基本科研业务费专项资金项目(2023JBKY18)。

摘　　要：为探究不同比例混氢天然气在家庭厨房内泄漏后的扩散特性,采用FLACS构建家庭厨房数值模型,研究不同比例混氢天然气泄漏后在水平(泄漏口侧到远离泄漏口侧)和垂直方向上的浓度分布,对比自由扩散和对流通风对气体扩散的影响。研究结果表明:距泄漏口上方1.15 m高度以下,高度、时间及混氢比对水平方向上气体体积分数的降幅影响较小;泄漏口侧和远离泄漏口侧垂直方向上具有不同层级的分层现象,且随混氢比和时间的增大,分层现象减弱;混氢比从0%增加到40.0%时,报警时间降幅比仅为1.42%;相较自由扩散,对流通风能快速排出可燃气体,降低风险。研究结果可为城镇燃气混氢应用提供参考。In order to investigate the diffusion characteristics of hydrogen-blended natural gas with different ratios after leakage in home kitchen,a numerical model of home kitchen was constructed using FLACS.The concentration distribution of hydrogen-blended natural gas with different ratios after leakage in the horizontal(from the side of leakage outlet to the side away from leakage outlet)and vertical directions was studied,and the influence of free diffusion and convective ventilation on the gas diffusion was compared.The results show that below the height of 1.15 m above the leakage outlet,the influence of height,time and hydrogen-blended ratio on the decrease of gas volume fraction in the horizontal direction is small.There are the stratification phenomena of different layers in the vertical direction on the side of leakage outlet and the side away from the leakage outlet,and the stratification phenomenon is weakened with the increase of the hydrogen-blended ratio and time.When the hydrogen-blended ratio increases from 0%to 40.0%,the reduction ratio of the alarm time is only 1.42%.Compared with free diffusion,the convective ventilation can quickly discharge the combustible gases and reduce the risk.The results of the study can provide a reference for the application of hydrogen mixing in urban gas.

关 键 词：家庭厨房 混氢天然气 泄漏扩散 通风条件 

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