水幕对低温液体蒸气云团扩散行为的影响  

Influence of water curtain on dispersion behavior of cryogenic liquid vapor cloud

作　　者：张登杨 杨申音 魏健健 金滔[1] Zhang Dengyang;Yang Shenyin;Wei Jianjian;Jin Tao(Institute of Refrigeration and Cryogenics/Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027, China;Beijing Institute of Aerospace Testing Technology, Beijing 100074, China)

机构地区：[1]浙江大学制冷与低温研究所/浙江省制冷与低温技术重点实验室,杭州310027 [2]北京航天试验技术研究所,北京100074

出　　处：《低温工程》2021年第1期7-14,共8页Cryogenics

摘　　要：以美国玫琳凯奥康纳过程安全中心(MKOPSC)的LNG泄漏实验为基础,建立了低温液体蒸气云扩散的数值计算模型,探究了水幕和蒸气云团之间的相互作用机理,在此基础上分析了水幕相关参数对气云扩散的影响。结果表明:水幕有助于蒸气云快速稀释到可燃极限以下,缩小危险区域范围;当水幕距泄漏源的距离为7 m、4.5 m和2 m时,可燃气云与地面的分离距离与无水幕工况相比分别缩短了26%、34%和49%;增加喷嘴流量能进一步缩短可燃气云与地面的分离距离,但其缩短速率逐步变小;水幕安装角度的增大会促进蒸气云的顺风向扩散,当安装角度大于45°时,甚至会超过无水幕工况时可燃气云的最大顺风向距离。In this work,a numerical calculation model of LNG vapor cloud dispersion is established,according to the LNG leakage experiment conducted by the Mary Kay O’Connor Process Safety Center(MKOPSC),to explore the interaction mechanism between the water curtain and the LNG vapor cloud.In addition,the influence of the setting distance of water curtain on the dispersion of vapor cloud is numerically analyzed.The results show that the water curtain helps the vapor cloud to dilute rapidly till below the flammable limit and to reduce the scope of the dangerous area.With the distances between water curtain and leakage source of 7 m,4.5 m and 2 m,the separation distance between the flammable vapor cloud and the ground can be reduced by 26%,34%and 49%,respectively.Increasing the nozzle flow rate can further reduce the separation distance between the flammable vapor cloud and the ground,however,the reduction rate will decrease slowly.Besides,the increase of the water curtain installation angle will promote the downwind dispersion of the vapor cloud.When the installation angle is larger than 45 degrees,the maximum downwind distance of the flammable vapor cloud can even exceed the distance of the case without water curtain.

关 键 词：低温液体 水幕 扩散 LNG蒸气 可燃气云 

分 类 号：TB611[一般工业技术—制冷工程]