Abstract:

Introducing ammonia fuel into internal combustion engines is beneficial for reducing vehicle pollutant emissions. This article investigated the combustion quality and pollutant emission performance of diesel engines doped with ammonia. A three-dimensional engine cylinder digital simulation model was established for a commercial vehicle diesel engine by using the engine cylinder the Converge simulation analysis software to analyze the combustion and emission performance of five fuel groups with ammonia blending energy ratios of 0%~40%. The results show that the engine ignition delay period tends to extend with the increase of ammonia substitution rate; The combustion duration first shortens and then extends; And the average temperature and the pressure in the cylinder decreases; The CO, NO, and soot emissions are significantly reduced; The CO emissions decreases by 41.6%, the NO emissions decreases by 68.7%, and the soot emissions decreases by 17.2%, when the ammonia substitution rate is 40%. Therefore, adding ammonia to diesel engines for combustion can effectively reduce emission levels, but it is necessary to control the ammonia energy ratio within a reasonable range to prevent combustion deterioration.

Key words: diesel engines, reduce of exhaust gas emission, ammonia-diesel dual fuel, substitution rate, combustion characteristics, emission characteristics