Journal of
Petroleum and Gas Engineering

  • Abbreviation: J. Petroleum Gas Eng.
  • Language: English
  • ISSN: 2141-2677
  • DOI: 10.5897/JPGE
  • Start Year: 2010
  • Published Articles: 123

Full Length Research Paper

Use of exhaust gas recirculation (EGR) and cyclonic separator for simultaneous NOx and PM reduction in DI diesel engines

Murari Mohon Roy*, S. M. Najmul Hoque, Md. Ariful Islam and Md. Mustafizur Rahman
Department of Mechanical Engineering, Rajshahi University of Engineering and Technology, P. O.- Kazla, Rajshahi-6204, Bangladesh
Email: [email protected]

  •  Published: 31 March 2011



This study presents the results of exhaust gas recirculation (EGR) and cyclonic separator for simultaneous oxides of nitrogen (NOx) and particulate matter (PM) reduction in a direct injection (DI) diesel engine under different engine loads and speeds. There is a significant NOx reduction by EGR, but PM is hugely increased, especially at high EGR rate-high load conditions. A significant reduction in PM is achieved by the use of cyclonic separator without deteriorating other emissions. At high speed-high load conditions, the cyclonic separator has a greater efficiency. Both NOx and PM reduce simultaneously when EGR and cyclonic separator are used together. Using cyclonic separator with high EGR rates, a remarkable NOx reduction is possible keeping the PM level significantly lower than non-EGR level.


Key words: Exhaust gas recirculation, cyclonic separator, direct injection diesel engine, diesel emissions, oxides of nitrogen, particulate matter.