Journal
APPLIED THERMAL ENGINEERING
Volume 132, Issue -, Pages 586-594Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2017.12.126
Keywords
Diesel engine; Hydrogen; Carbonyl compounds; Ozone formation potential
Funding
- National Science Council and Environmental Protection Administration of Taiwan [NSC102-EPA-F-009-001]
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In this study, diesel engine was fueled by multi-fuels, including conventional diesel and 0, 0.6 and 1.2 vol % hydrogen and operated at low to high engine loads. Low molecular weight carbonyls, such as formaldehyde, acetaldehyde, and acetone, contributed 79.2-87.2% of total carbonyl compounds which are the more prominent when the engine operated at low load. With 0.6 and 1.2 vol% of hydrogen addition, formaldehyde decreased 10.4-10.9% at idling condition. As the load increases 25, 50 and 75%, the formaldehyde decreased by 2.93-25.1, 5.91-25.8 and 2.28-40.5%, respectively. The same reduction phenomenon can also be observed from acrolein, acetone, propionaldehyde, crotonaldehyde and 2-butanone & butyraldehyde emissions. The highest ozone-formation potential (OFP) from multi-pollution emissions was found at idling operation. The high OFP could be reduced by increasing hydrogen additions and eventually approached the lowest level with 1.2 vol% hydrogen addition at middle to high engine load. Nevertheless, the diesel engine with hydrogen addition could reduce a certain amount of CBC emission and OFP at engine idling operation. (C) 2018 Elsevier Ltd. All rights reserved.
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