摘要
通过建立DN25规格的小尺度埋地管道试验装置,开展了气相和超临界相CO2通过2mm口径的埋地管道向上泄漏试验,通过改变管道埋地深度(0mm、200mm、400mm),研究了气相和超临界相CO2埋地管道发生泄漏时土壤表面和泄漏口区域的形貌,以及泄漏口附近管壁和土壤区温度的分布。结果表明:气相和超临界相CO2埋地管道发生泄漏时,在不同相态和管道埋地深度下,土壤表面会呈现“土壤喷射”、“小孔射流”和“土壤隆起”3种不同形貌;当土壤表面不发生“土壤喷射”时,泄漏口附近会形成冻土球;管道埋地深度越大,管壁温降速率增大,管壁最低温度降低;土壤区温度与埋地管道距泄漏口的距离呈指数函数关系,且在泄漏口附近土壤区射流方向的温降最大,管道埋地深度增加使得泄漏口附近土壤区在射流背向的温降幅度明显增加。
By establishing a small-scale buried pipeline experimental device with the size of DN25,this paper carries out an upward leakage experiment of gas phase and supercritical phase CO2.The size of leaking orifice is 2mm.By changing the buried depth of the pipeline(0mm,200mm,400mm),the experiment obtains the morphology of the soil surface and the leaking area as well the temperature distribution of the pipe wall and soil near the leaking orifice.The results of the experiment suggest that under the different initial phase and the depth of buried,the soil presents three different kinds of morphology,soil spraying,soil uplift and orifice jet.When soil spraying does not occur on the soil surface,the frozen soil ball forms near the leaking orifice.The greater the buried depth,the higher the wall temperature drop rate and the lower the wall temperature.The soil temperature is exponentially related to the distance between the measuring point and the leaking orifice,and the temperature drop is the largest in the jet direction.In addition with the depth of buried increase,the temperature at the opposite direction of jet decreases significantly.
作者
喻健良
刘少荣
闫兴清
曹琦
闫振汉
YU Jianliang;LIU Shaorong;YAN Xingqing;CAO Qi;YAN Zhenhan(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;School of Mechanical and Electrical Engineering,Jilin Institute of Chemical Technology,Jilin 132000,China)
出处
《安全与环境工程》
CAS
北大核心
2019年第5期167-174,共8页
Safety and Environmental Engineering
