LNG船对船过驳作业配置模型与安全稳定性分析

针对LNG船对船过驳作业中设备选型与配置问题, 利用多层次模糊综合评判分析并系统性地构建了LNG船对船过驳作业配置模型, 提出了LNG船对船过驳设备配置稳定性的定量分析方法和计算流程, 以145 000 m3和60 000 m3的LNG船舶为试验对象, 利用计算流体动力学(CFD)技术对2船组合体配置系统开展仿真试验分析, 并基于仿真试验结果开展了该模拟工况条件下LNG船对船过驳选型适配度的计算。结果表明: 在模拟工况下LNG船对船过驳选型与配置适配度为0.85, 与最优值1.00的误差为15%, 在20%的误差允许范围内, 验证了所提出的LNG船对船过驳作业选型与配置模型的有效性; 同时, 明确了LNG船对船过驳作业的环境限制条件应为能见度大于1 000 m, 风力小于6级, 流速小于2.5 n mile/h, 过驳作业安全区半径范围为1 210 m。采用所构建的过驳作业选型与配置模型能够实现LNG船对船过驳作业设备选型与配置安全稳定性的量化分析和确定具有普适性的LNG船对船过驳作业限制条件, 对于保障LNG船对船过驳作业关键配置选型的安全性具有重要意义。 

A Study of Configuration Model and Safety Analysis for Ship-to-ship Transfers of Liquefied Natural Gas

To address the problem of equipment selection and configuration for LNG ship-to-ship barge operation, a configuration model is systematically developed based on the multi-level fuzzy comprehensive evaluation analysis.A quantitative analysis method is proposed to calculate the stability of LNG ship-to-ship transfer equipment. Taking145 000 m3 and 60 000 m3 LNG ships as test objects, simulation analysis of the assembly configuration system is carried out based on the Computational Fluid Dynamics(CFD) method. The goodness of fit analysis under the simulated conditions are carried out based on the configuration model of LNG ship-to-ship transfer operation. According to the results, the goodness of fit of the selection and configuration of LNG ship-to-ship transfer under the simulated working condition is 0.85, whose error between the optimal value is 15% that is within the allowable range of 20%.It verifies the proposed LNG ship-to-ship transfer select and configuration model. Meanwhile, the LNG ship-to-ship transfer operation is restricted by the visibility greater than 1 000 m, a wind speed of less than 10.8 m/s, a flow rate of less than 2.5 n mile/h, and a safety zone radius of 1 210 meters. The configuration model can not only be used to provide quantitative safety analysis of the configuration for LNG ship-to-ship transfer equipment, but also to set up the environmental restriction conditions of LNG ship-to-ship transfer operation.