LNG接收站双码头卸料工况的水击分析

Analysis on water hammer during unloading at dual wharfs of LNG receiving terminal

中国LNG进口量已跃居世界第一位,LNG接收站的建设规模及周转量也逐年增加,单一码头已不能够满足LNG接收站的接卸要求,因此多个码头建设对LNG接收站工程提出了新的要求,从双码头双卸料管线的设计出发进行水击分析,提出了LNG接收站建设双码头的必要性。以解决双码头卸料水击压力及不平衡力为目的,利用管道波速方程、运动方程、连续方程为理论依据,搭建计算模型,采用PIPENET专业流体水击计算软件为计算工具,以实际操作工况为设计条件输入进行计算分析。计算结果合理可行,可为下一步管道及应力计算提供设计依据,最终满足整个卸料管线设计要求。

China’s LNG import volume has ranked first in the world. As the scale of development and turnover of the LNG receiving terminals have increased year by year, a single terminal can no longer meet the loading and unloading requirements of the receiving terminal. Therefore, the construction of multiple wharfs has put forward new requirements for the LNG terminal project. Water hammer analysis has been carried out from the design of dual wharfs and dual unloading pipelines, and the necessity of building dual wharfs has been put forward. In this paper, for the purpose of solving the water hammer pressure and unbalanced force in the unloading of dual wharfs, the calculation model is built based on the theoretical basis of the wave velocity equation, motion equation and continuity equation of the pipeline. The professional water hammer calculation software PIPENET is used as the tool to calculate and analyze, taking the actual operating conditions as the design conditions. The calculation result is reasonably practicable, which provides a design basis for the pipeline and stress calculation in the next step, and can finally meet the design requirements of the entire unloading pipelines.