Methodology To Reduce Diesel Engine Pollutant Emissions

Abstract

Ahmad Saylam

Due to the climate change and health issues, more restrictive legislations concerning the pollutant emissions of diesel engines take place in the worldwide. A novel approach to reduce the pollutant emissions of CO, NOx and unburned hydrocarbons (HC) in diesel engines is thus proposed. It’s based on fuelling diesel engines by blends of selective additives mixture and the conventional commercial diesel fuel. In order to prove the feasibility of such an approach, blends of additives mixture and a diesel fuel surrogate of n-dodecane and m-xylene are numerically investigated using a homogeneous multi-zones reactor approach and detailed chemistries with covering a wide blending range of air–fuel ratio (AFR) 9.8 – 29.4 and engine speed 1000 - 2000 rpm. The employed mixture of additives reduces considerably the emissions of CO and HC, up to 60%, especially for the rich conditions AFR = 9.8, with generally very slight reduction to NOx emission and decease to the engine produced power for all the blending ratios. The reduction of NOx emission is thus reachable by the accessibility to operate the engine at low compression ratio blending the additives mixture. The proposed approach requests indeed to be validated experimentally and be coupled with other emissions reduction technologies.

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