内河LNG燃料船透气管出口高度评估研究

为合理制定内河液化天然气(LNG)燃料船透气管出口高度标准,在保证船舶安全前提下,解决通航桥梁限制问题,本文基于单一故障原则和风险评估方法,对内河典型LNG燃料船透气管出口高度进行了评估。根据假定船型的布置特点和航行条件,结合出口高度和型式,选定了24种天然气释放场景,利用理想气态方程计算了天然气的释放速率和持续时间,采用三维计算流体力学(CFD)软件FLACS进行天然气扩散波及范围模拟分析。结合天然气扩散接受准则,给出了制定透气管出口高度标准的最小值,对中国船级社《天然气燃料动力船舶规范》合理性进行了验证。针对内河LNG燃料船的航行特点,推荐一种新型透气管出口布置型式。

Evaluation Study for Vent Mast Height of Inland LNG Fuelled Ships

In order to develop the reasonable height standard of vent mast for inland LNG fuelled ships, in the premise of safety, and resolve the problem of navigation height limited due to the old bridge, this study of evaluation to the height of vent mast for a typical LNG fuelled ship was carried out based on the principle of single failure and method of risk assessment. In accordance with the feature of ship arrangement and sailing condition, combined with the height and type of outlet, total 24 kinds of gas release scenario were selected, the release rate and duration time of gas release were calculated by the ideal gas equation, the range of gas dispersion was simulated by using the three dimensional Computational Fluid Dynamics (CFD) software FLACS. Based on the criteria of gas dispersion acceptance, the minimum height of vent mast was given for developing the requirement in standard, and the rationality of rules for natural gas fuelled ships issued by China Classification Society was verified. In view of the navigation feature of LNG fuelled ship in Inland River, a new type of vent mast arrangement was recommended.