International Journal of Petroleum and Gas Engineering ISSN 5675-0715 Vol. 3 (4), pp. 001-010, April, 2016. © International Scholars Journals

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.

Accepted 10 November, 2015

Abstract

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 and particulate matter.