The effect of dynamic operating conditions on nano-particle emissions from a light-duty diesel engine applicable to prime and auxiliary machines on marine vessels

• Published in: International journal of naval architecture and ocean engineering Vol. 4; no. 4; pp. 403 - 411
• Main Authors: Lee, Hyungmin, Jeong, Yeonhwan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-12-2012; De Gruyter Open; Elsevier; 대한조선학회
• Subjects: Cold start; DPF; Nano-sized PM; Prime and auxiliary machine; Transient; 조선공학; Nano-sized PM; Prime and auxiliary machine; DPF; Transient; Cold start
• ISSN: 2092-6782; 2092-6790; 2092-6782
• DOI: 10.2478/ijnaoe-2013-0106

This study presents the nano-sized particle emission characteristics from a small turbocharged common rail diesel engine applicable to prime and auxiliary machines on marine vessels. The experiments were conducted under dynamic engine operating conditions, such as steady-state, cold start, and transient conditions. The particle number and size distributions were analyzed with a high resolution PM analyzer. The diesel oxidation catalyst (DOC) had an insignificant effect on the reduction in particle number, but particle number emissions were drastically reduced by 3 to 4 orders of magnitude downstream of the diesel particulate filter (DPF) at various steady conditions. Under high speed and load conditions, the particle filtering efficiency was decreased by the partial combustion of trapped particles inside the DPF because of the high exhaust temperature caused by the increased particle number concentration. Retarded fuel injection timing and higher EGR rates led to increased particle number emissions. As the temperature inside the DPF increased from 25 °C to 300 °C, the peak particle number level was reduced by 70% compared to cold start conditions. High levels of nucleation mode particle generation were found in the deceleration phases during the transient tests.