The Effect of EGR on Exhaust Emissions in a Direct Injection Diesel Engine

직분식 소형 과급 디젤엔진에서 EGR이 배기배출물에 미치는 영향

  • Jang, Se-Ho (Department of Power System Engineering, Gangwon Provincial University) ;
  • Koh, Dae-Kwon (Department of Mechanical Engineering, Pukyong University)
  • 장세호 (강원전문대학 동력기계시스템과) ;
  • 고대권 (부경대학교 기계공학부)
  • Published : 2005.09.01

Abstract

The direct injection diesel engine is one of the most efficient thermal engines. For this reason DI diesel engines are widely used for heavy-duty applications. But the world is faced with very serious problems related to the air pollution due to the exhaust emissions of diesel engine. So, that is air pollution related to exhaust gas resulted from explosive combustion should be improved. Exhaust Gas Recirculation(EGR) is a proven method to reduce NOx emissions. In this study, the experiments were performed at various engine loads while the EGR rates were set from $0\%$ to $30\%.$ The emissions trade-off and combustion of diesel engine are investigated. The brake specific fuel consumption rate is very slightly fluctuated with EGR in the range of experimental conditions. The ignition delay increased with increasing EGR rate. The maximum value of premixed combustion for the rate of heat release is increased with increasing EGR rate. NOx emissions are decreased with increasing EGR rate at high load and high speed. It was found that the exhaust emissions with the EGR system resulted in a very large reduction in oxides of nitrogen at the expense of higher smoke emissions.

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