LNG船推进装置对比分析

Analysis and Comparison of Main Propulsion Units for LNG Carrier

以174000m^3液化天然气(Liquefied Natural Gas,LNG)船为例,对LNG船采用双燃料发动机时采用何种推进装置最为经济进行研究。从推进装置的初投资成本和运营成本的角度出发,对比分析现代LNG船广泛采用的2种推进方式(机械推进和电力推进)在使用双燃料机时的经济性,为船舶设计院及船东设计和建造LNG船提供参考。通过研究发现:二冲程双燃料机械推进装置在推进效率、运营成本和初投资成本方面均优于四冲程双燃料电力推进装置。

Based on a174000m3Liquefied Natural Gas(LNG)carrier,this paper studies the functions of propulsion units to find out the most efficient one for the dual fuel engine of LNG carriers.It compares and analyses the efficiency of two popular modern propulsion forms for the dual fuel engines of LNG carrier,i.e.mechanical propulsion and electrical propulsion,with the initial investment cost and operational cost into consideration to provide references for the design and construction of LNG carriers.The result shows that the two-stroke dual fuel mechanical propulsion unit has more advantages over the four-stroke dual fuel electrical propulsion unit in terms of propulsion efficiency,operational cost and initial cost.