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大型LNG燃料船舶的LNG加注量大,为了减少靠港时间,需要考虑在LNG燃料在港加注的同时进行船舶装卸货操作。以一艘10 000 m3 LNG加注船对一艘18 000 TEU LNG燃料动力集装箱船的在港加注为研究对象,基于失效频率分析拟定了4个LNG泄漏场景,采用三维计算流体力学(CFD)软件FLACS分析了LNG泄漏后的可燃气体影响范围,最终得到了一个矩形危险区域,将此危险区域范围之外的区域作为LNG燃料加注与装卸货同时操作的安全区域。研究表明,LNG燃料船对船加注与装卸货同时操作的安全区域设定不可一概而论,不同的设计和作业条件将有不同的安全区域,在该类问题分析中,不能忽视LNG加注软管泄漏和加注船液货舱安全阀排放两种场景。
Large-scale LNG fuel vessels have large LNG infill volumes. In order to reduce the port-of-arrival time, it is necessary to consider loading and unloading of LNG fuel while the LNG fuel is being refueled in the port. A 10 000 m3 LNG tanker was used to study the refueling of a 18 000 TEU LNG fuel container in Hong Kong. Based on the failure frequency analysis, four LNG leakage scenarios were formulated and three-dimensional computational fluid dynamics (CFD) Software FLACS analyzes the influence range of flammable gas after LNG leakage, finally obtains a rectangular hazardous area, and uses the area outside this dangerous area as a safe area for simultaneous operation of LNG refueling and loading and unloading. The research shows that the design of safety zone for LNG carrier ships can not be generalized to the simultaneous operation of ship filling and loading and unloading. Different design and working conditions will have different safety zones. In this kind of problem analysis, the LNG filling hose Leakage and refilling of cargo tank safety valve discharge two scenarios.