不同系泊模式LNG旁靠超大型FSRU系泊系统设计及水动力性能分析

Mooring Design and Hydrodynamic performance analysis on LNG moored to FSRU in different mooring mode

本文采用规范设计、理论分析和数值仿真相结合的方法,建立LNG船与LNG-FSRU两船旁靠系泊的理论和数值分析模型,对LNG旁靠FSRU码头系泊和软钢臂单点系泊两种典型系泊模式下的转运及卸载作业进行数值分析.同时考虑外部海洋环境风、浪、流组合作用下的综合作业工况,确定FSRU与LNG近距离旁靠作业时系泊设备、缆绳种类、固定式和漂浮式护舷的选型和布置,对LNG、FSRU船的运动特性以及运动过程中缆绳张力和护舷受力开展统计分析,优化系泊系统布置和参数.在系泊系统设计和分析的基础上,根据系泊缆的直径、所受最大张力值,为系泊设备选型提供参考,便于开展码头系泊系统和单点系泊系统布置研究.基于旁靠系泊的设计标准提出LNG-FSRU安全作业的最大允许海况,为LNG-FSRU的运营提供可靠的技术保障.

In this paper, with the combination of specification design,theoretical analysis and numerical simulation,we establish the theoretical and numerical analysis model of LNG and LNG-FSRU. We conducted the numerical analysis on the side-by-side mooring system about the LNG and LNG-FSRU. As for LNG-FSRU ship, there are two typical mooring systems: FSRU terminal mooring system and soft yoke single point mooring system. Taking into account the comprehensive operating conditions under the combination of wind, wave and current in the external marine environment, we preliminary determined the mooring mode, layout of mooring equipment, the selection of mooring lines, fixed and floating fenders. Through the analysis of the movement characteristics of LNG, LNG-FSRU and the cable tension and fender force during the movement, the mooring system layout and parameters are optimized. Based on the theoretical design and analysis of the mooring system, according to the diameter of the mooring cable and the maximum tension value, we made the final arrangement of terminal mooring system and single point mooring system. At the same time, based on the mooring design standards, we proposed the maximum allowable sea conditions for the operation of LNG-FSRU to provide reliable technical support.