The Effects of Biodiesel on the Performance and the Durability of Diesel Engine Active-DPF National Chung-Hsing Univ

Format:

Conference/Event

Author/Creator:

Lu, Lu, author.

Contributor:

Ku, Yong-Yuan

Liao, Ching-Fu

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Recently, due to the concern on shortage in the supply of energysource as well as the greenhouse effect of engine exhaust, the useof renewable fuel, e.g., biodiesel, in the transportation sector ispromoted. However, there are distinctions on both the physical andchemical properties between biodiesel and fossil diesel. Thesedeviations in fuel property would result in different combustioncharacteristics and affect the performance of exhaustaftertreatment system, including the catalytic converter and thediesel particle filter.The purpose of this study is to investigate the effect ofbiodiesel on the performance and the durability of diesel particlefilter. The biofuel adopted in this study was obtained bytransesterification from methanol and spent edible oils, andfulfills the requirements specified in EN 14214 standard. All thetests were conducted in a heavy diesel engine (ISUZU 4JJ1E4N). Twostudies were carried out in this paper. In the first study, B5 wasused in a durability test to find out the long term performance ofactive DPF running on biodiesel. The durability test followed theEU ETC procedure for 1000 consecutive hours. The effectiveness testof DPF was performed every 250 hours. At the end of durabilitytest, a thorough examination on the performance deterioration wascarried out, including emission conversion efficiency,deterioration rate, and surface analysis of catalyst.It was found that after 1000 hours of consecutive running on B5,the catalytic converter still maintained its conversion efficiencyhigher than 90% for both CO and HC during the EU ESC test procedurewith exhaust temperature in the range of 350~460°C. No noticeabledeterioration in CO, THC, and PM conversion efficiency was found.An examination on the surface of catalyst with SEM and EDS gave thefinding that phosphorous and sulfur contents are lower than 1% byweight. The active regeneration system works well during thedurability process, and the conversion efficiency on both PM and PNare higher than 90% in EU ETC test as well as ESC test.In the second study, different contents of biodiesel (D100, B5,B20, B40, and B60) were used to find out the effect of biodiesel onthe balance point temperature (BPT) of soot accumulation in DPF aswell as the light-off temperature in DOC. In the balance pointtemperature test, the engine speed was set at 2000 rpm. The engineload was controlled to suppress exhaust temperature lower than250°C at first to enhance soot accumulation in DPF. Then the engineload was increased gradually to raise the exhaust temperature untilthe accumulated soot ceased increasing, which was monitored withthe differential pressure drop of DPF. It was found that thebalance point temperature for biodiesel is lower than that offossil diesel. The decrease in balance point temperature is 13°Cfor B20.In the DOC light-off temperature test, the engine speed was setat 1200 rpm, and the engine load was increased gradually until300°C of exhaust temperature was reached. The conversion efficiencyof CO was monitored during the process, and the light-offtemperature was determined as the conversion efficiency reached80%. It was found that the DOC light-off temperature drops asbiodiesel content increases. The maximum decrease of light-offtemperature is 41°C for B60

Notes:

Vendor supplied data

Publisher Number:

2012-01-1089

Access Restriction:

Restricted for use by site license