摘要
为厘清海洋天然气水合物分解气体泄漏运移机制,构建基于计算流体动力学法的海洋环境中水合物分解气体运移行为预测模型,考虑海流流速、环境压力和温度随水深的梯度变化,以及分解气体在海洋环境中的密度和尺寸变化,采用拉格朗日离散相模型模拟水合物分解天然气在海洋环境中的运动特征,追踪其运移轨迹,评估抵达海面的时间、扩散距离及海面影响范围等关键风险参数。研究结果表明:当前工程实践开采量的水合物分解气体泄漏运移至海面不会造成海面火灾和船舶失稳风险;上浮时间、扩散距离和表层海水密度与气体分解量呈反比,海面影响区域尺寸随气体分解量先增大而后降低。
In order to reveal leakage and migration mechanism of natural gas from marine hydrate decomposition,a prediction model of its migration behavior was established based on computational fluid dynamics.Then,considering the gradient change of current speed,environmental pressure and temperature along with water depth as well as variance of gas density and bubbles size,Lagrangian discrete phase model was employed to simulate movement of decomposition gas in marine environment,and its motion trajectory was tracked.Finally,critical parameters,e.g.,rise time,dispersion distance and influence size on sea surface were predicted.The results show that under present produced quantity in engineering practice,release and movement of hydrate decomposition gas to sea level will not cause offshore fire and loss of stability.Rise time,dispersion distance and density of surface seawater are in inverse proportion to gas composition quantity,while influencing area increases first and then decreases along with the increase of it.
作者
李新宏
王靖雯
朱玉娇
韩子月
陈国明
LI Xinhong;WANG Jingwen;ZHU Yujiao;HAN Ziyue;CHEN Guoming(School of Resources Engineering,Xi'an University of Architecture and Technology,Xi'an Shaanxi 710055,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian Liaoning 116024,China;Centre for Offshore Engineering and Safety Technology,China University of Petroleum,Qingdao Shandong 266580,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2021年第11期114-119,共6页
China Safety Science Journal
基金
国家自然科学基金资助(52004195)
中国博士后科学基金资助(2020M673355)
大连理工大学海岸和近海工程国家重点实验室开放基金资助(LP2021)。
关键词
海洋水合物
分解气体泄漏
运移后果
扩散距离
海面溢出区域
marine hydrate
decomposition gas leakage
migration consequence
dispersion distance
surface overflow area
