关键词: LNG组分, LNG燃料舱, 双燃料发动机, 蒸发率, 低热值, 甲烷值

Abstract: Liquefied natural gas (LNG) becomes widely used in ship industry as it is a kind of green fuel. The thermal and physical parameters of the different LNG components are compared and calculated based on the design of a 210 000 ton dual fuel bulk carrier, such as their boiling point, density, heating value of evaporation, enthalpy, composition of evaporation gas, low heating value and methane number. The value and deviation range of the boil-off rate of the marine LNG fuel tank and the critical gas supply parameter of the dual fuel engine are quantitatively analyzed and calculated corresponding to the different LNG fuel compositions. Some reasonable suggestions are provided for the practical application of LNG as marine fuel.

Key words: LNG composition, LNG fuel tank, dual fuel engine, boil-off rate, low heating value, methane number