Chong, Jun Jie (2013). The application of thermal, catalytic and non-thermal plasma oxidation processes to enhance NO-NO\(_2\)oxidation in the engine exhaust and improve DPF regeneration at lower temperatures. University of Birmingham. Ph.D.
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Chong13Phd.pdf
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Abstract
Diesel Particulate Filter (DPF) is believed to be one of the most effective methods and provides an efficient system that traps more than 90% of PM. However, the soot accumulated within the filter requires a regeneration process to recover its performance. Thus, the high oxidation ability of NO-NO\(_2\) increases the interest of applying it in the low temperature regeneration process.
The intention of this thesis is to investigate several possibilities of on-board NO-NO\(_2\) oxidation methods for increasing the NO\(_2\)/NO\(_X\) ratio in the exhaust gas.
These possible oxidation routes incorporate the in-cylinder to the exhaust gas treatment processes. A wide range of operated temperatures are managed by the application of the non-thermal plasma oxidation (NTP) for low temperatures, catalytic oxidation for moderated temperatures and thermal oxidation for high temperatures studied.
The in-cylinder NO oxidation was significantly improved by adding H\(_2\) or the reformed EGR (REGR) to the combustion. The remaining H\(_2\) after the combustion also contributes to the downstream HC-SCR which in turn promotes the NO oxidation.
The thermal and NTP methods in the exhaust treatment cannot adequately achieve a satisfactory NO oxidation result under a single occupied condition. The propane (C\(_3\)H\(_8\)) addition may potentially create useful radicals (HO\(_2\), RO\(_2\)) within the system and convert a large portion of NO into NO\(_2\).
| Type of Work: | Thesis (Doctorates > Ph.D.) | ||||||
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| Award Type: | Doctorates > Ph.D. | ||||||
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| College/Faculty: | Colleges (2008 onwards) > College of Engineering & Physical Sciences | ||||||
| School or Department: | School of Engineering, Department of Mechanical Engineering | ||||||
| Funders: | None/not applicable | ||||||
| Subjects: | T Technology > TJ Mechanical engineering and machinery | ||||||
| URI: | http://etheses.bham.ac.uk/id/eprint/3941 |
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