Simulation Research on Combustion Process in a Natural Gas-Diesel Dual-Fuel Marine Engine

Abstract:

In order to solve the problem of Diesel natural gas dual fuel engine, such as power reduction, low charging efficiency, the conception of diesel engine fueled with pilot-ignited directly-injected liquefied natural gas is put forward. On the basis of this theory, a medium speed diesel of the marine is refitted into dual fuel engine, in order to keep original power, decrease the temperature of combustion and reduce emission. The LNG injection timing, duration of LNG injection and the different ratios the pilot diesel to total energy are studied the method of AVL FIRE software. Conclusions are as follows: When the different ratios pilot diesel to total energy is 0.5%, the engine can not work; Delaying the LNG injection timing, shortening the LNG injection duration and choose the right ratios pilot diesel to total energy can reach the indicated power of original machine, and the NOx emissions level will be greatly reduced.

• Periodical: Applied Mechanics and Materials (Volume 525)
• Pages: 227-231
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.525.227
• Online since: February 2014
• Authors: Min Xiao, Chun Long Feng
• Keywords: Injection Duration, LNG, Ratios the Pilot Diesel, Timing of Injection

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