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Diesel engine emissions with oxygenated fuels: A comparative study into cold-start and hot-start operation

Zare, A and Nabi, MN and Bodisco, TA and Hossain, FM and Rahman, MM and Chu Van, T and Ristovski, ZD and Brown, RJ (2017) Diesel engine emissions with oxygenated fuels: A comparative study into cold-start and hot-start operation. Journal of Cleaner Production, 162. pp. 997-1008. ISSN 0959-6526

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Abstract

As biofuels are increasingly represented in the fuel market, the use of these oxygenated fuels should be evaluated under various engine operating conditions, such as cold-start. However, to-date quantification has been mostly done under hot-start engine operation. By using a custom test designed for this study, a comparative investigation was performed on exhaust emissions during cold- and hot-start with diesel and three oxygenated fuels based on waste cooking biodiesel and triacetin. This study used a six-cylinder, turbocharged, after-cooled diesel engine with a common rail injection system. The results during cold-start with diesel showed lower NOx (up to 15.4%), PN (up to 48%), PM (up to 44%) and PM (up to 63%). However, the oxygenated fuels during cold-start showed a significant increase in NOx (up to 94%), PN (up to 27 times), PM (up to 7.3 times) and PM (up to 5 times) relative to hot-start. The use of oxygenated fuels instead of diesel during hot-start decreased the PN, PM and PM (up to 91%) while, during cold-start, it only decreased PM and PM at some engine operating modes and increased PN significantly up to 17 times. In both cold- and hot-start, the use of oxygenated fuels resulted in an increase in NOx emission. For cold-start this was up to 125%, for hot-start it was up to 13.9%. In comparison with hot-start, the use of oxygenated fuels during cold-start increased nucleation mode particles significantly, which are harmful. This should be taken into consideration, since cold-start operation is an inevitable part of the daily driving schedule for a significantly high portion of vehicles, especially in cities. 1 2.5 1 2.5 2.5 1 1 2.5

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 30 Jan 2019 21:48
Last Modified: 10 Apr 2021 00:31
DOI: 10.1016/j.jclepro.2017.06.052