Simulating the influence of EGR on NOx emission of the diesel engine with CHEMKIN

Abstract

Based on the Closed Internal Combustion HCCI Engine Simulator model in CHEMKIN, this paper simulates the NOx emission of a four-stroke single-cylinder non-supercharged 135 diesel engine operating at different exhaust gas circulation rates and temperatures. Simulation experiments and analysis find that when the exhaust gas is cooled, the maximum temperature of in-cylinder combustion and the emission of NOx decrease with the increase of the exhaust gas circulation rate; when the recirculated exhaust gas is not cooled, the maximum temperature of the in-cylinder combustion barely changes with different exhaust gas circulation rates, and the NOx emission will not be greatly decreased.