Nitrogen Oxides Emission Characteristics of Diesel Engine Fuelled by Gas to Liquid Fuel

Abstract:

A direct injection(DI) engine for the passenger car is chosen as the test sample,and 5 gas to liquid (GTL) blends with different mixing ratio are used.The total NOx emission and the main constituents of NO, NO2 and N2O are analyzed. According to the results, the NOx emission of different GTL blends shows no great difference,and as the load increases,the difference becomes greater.The total NOx emission is mainly composed of NO and NO2.The NO emission of the blends increases as load rises,and NO occupies the biggest proportion of the total NOx emission.However,NO2 occupies a comparatively big proportion.The NO2 emission is comparatively low under low and high load,while it reaches highest under medium load.High temperature and high load are not in favor of the generation of NO2.The emission of N2O is extremely low,and is mainly generated under low load;while under mid and high load,the emission of N2O is approximately zero.As the blending proportion of GTL increases,the NOx and NO emission decrease sharply,while NO2 emission increases a little.