南海复杂海况下FPSO压力容器关键结构安全性分析及试验研究

Safety analysis and experimental study on key structure of FPSO pressure vessel under complex sea conditions in the South China Sea

压力容器是FPSO油气处理模块的关键装置,其内部原油在船体横摇运动作用下,对内壁产生冲击载荷,致使封头出现应力集中现象甚至开裂,严重威胁海洋石油开采和FPSO工作人员安全。本文以南海118号FPSO压力容器为例,结合南海实际海况,建立了船舶运动响应方程;开展了基于FLUENT数值模拟计算的压力容器关键结构安全性评价分析研究,结果表明其关键结构应力值和海况等级以及充装系数呈正相关的关系,危险区域均安全;采用电动六自由度平台开展压力容器比例模型试验,测点试验与仿真值变化规律基本一致,数值误差仅为11.804%,验证了仿真模型的精确度。研究成果为FPSO压力容器结构设计和事前维修提供了指导,试验方法为FPSO压力容器模拟试验提供了参考。

The pressure vessel is the key device of the FPSO oil and gas processing module.The internal crude oil under the hull roll motion exerts an impact load on the inner wall,causing stress concentration or even cracking of the seal head,which seriously threatens the safety of offshore oil exploitation and FPSO staff.Taking the FPSO pressure vessel of No.118 Nanhai as an example,considering the actual sea conditions in the South China Sea,the ship motion response equation is established.The safety evaluation and analysis of the critical structure of the pressure vessel based on FLUENT numerical simulation is carried out.The results show that the key structural stress value and sea state the grade and filling coefficient are positively correlated,and the dangerous areas are safe.The electric six-degree-of-freedom platform is used to carry out the pressure vessel proportional model test.The test of the measuring point and the simulation value are basically the same,the numerical error is only 11.804%,and the simulation model is verified.The accuracy.The research results provide guidance for the design and advance maintenance of FPSO pressure vessel structure.The test method provides a reference for FPSO pressure vessel simulation test.