地面条件对LNG泄漏扩散的影响  

The Effect of Ground Conditions on the Leakage Diffusion of LNG

作　　者：陈兵[1] 刘金 周宁 陈力 CHEN Bing;LIU Jin;ZHOU Ning;CHEN Li(China Academy of Safety Science and Technology Beijing 100012)

机构地区：[1]中国安全生产科学研究院,北京100012 [2]中粮贸易有限公司,北京100005 [3]常州大学石油工程学院,江苏常州213016

出　　处：《工业安全与环保》2018年第11期1-5,共5页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(51204026);国家重点研发计划公共安全风险防控与应急技术装备专项(2017YFC0805100);建筑消防工程技术公安部重点实验室开放课题(KFKT2015ZD03);公安部科技项目(2016JSYJD04);江苏省高校自然科学研究重大项目(17KJA440001)

摘　　要：采用Fluent软件开展在不同地面条件下LNG泄漏扩散的数值模拟,研究了地面粗糙度和热通量对LNG泄漏扩散过程中甲烷体积分数为ULF,LFL,1/2 LFL分布规律的影响。结果表明:甲烷ULF,LFL,1/2 LFL等体积分数线最远扩散距离随着地面粗糙度值增加而减小,尤其是甲烷1/2 LFL等体积分数线最远扩散距离减少达70 m,约8. 5%;另外甲烷ULF,LFL,1/2 LFL等体积分数线最远扩散距离随着地面热通量的增加而减小,尤其是甲烷1/2 LFL等体积分数线最远扩散距离减少达85 m,约14%。It has been carried out the numerical simulation of leakage diffusion of LNG under different ground conditions by Fluent software and the influence of ground roughness and heat flux on the distribution of methane volume fraction(ULF,LFL,1/2 LFL)in the process of LNG leakage and diffusion is emphatically studied.The results show that,in the stage of heavy gas leakage diffusion LNG,with the increase of ground roughness,the farthest diffusion distance of methane ULF,LFL,1/2 LFL equal volume fraction lines decreases,especially,the farthest diffusion distance of the methane 1/2 LFL equal volume fraction lines can be reduced 70 meters,about 8.5%.Furthermore,with the increase of surface heat flux,the most distant diffusion distance of LNG leakage methane ULF,LFL,1/2 LFL equal volume fraction line decreases in the process of LNG leakage and diffusion,especially the farthest distance of methane 1/2 LFL equal volume fraction lines can be reduced 85 meters,about 14%.

关 键 词：LNG 气云扩散 粗糙度 热通量 影响 

分 类 号：TE88[石油与天然气工程—油气储运工程]