Exhaust gas fuel reforming for improved gasoline direct injection engine efficiency and emissions

Fennell, Daniel Alexander (2014). Exhaust gas fuel reforming for improved gasoline direct injection engine efficiency and emissions. University of Birmingham. Ph.D.

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Abstract

The thesis investigates how exhaust gas fuel reforming, also known as reformed exhaust gas recirculation (REGR), may benefit direct injection gasoline (GDI) engine efficiency and emissions. REGR is a thermochemical process that has potential for efficiently producing hydrogen-rich gas onboard a vehicle by using waste exhaust energy to promote endothermic reforming of hydrocarbon fuels. Partially fuelling a gasoline engine with hydrogen generally improves engine thermal efficiency.

The experimental research begins by simulating REGR on single- and multi-cylinder GDI engines, which indicates that REGR can increase engine thermal efficiency by up to 9% and reduce NOx by up to 96%. Particulate matter (PM) measurements reveal that REGR significantly reduces PM number and mass emissions, beyond that achieved by EGR.

Further experiments with a full-scale prototype exhaust gas fuel reformer integrated with the multi-cylinder GDI engine demonstrate improved fuel efficiency at a wide range of engine conditions, by 8% for conditions typical of motorway driving. The reforming process is observed to be overall endothermic when the exhaust temperature is above 650°C, and the reformed fuel enthalpy is increased by up to 21% in these experiments.

The results demonstrate that REGR can simultaneously increase engine thermal efficiency, and reduce gaseous and PM emissions.

Type of Work: Thesis (Doctorates > Ph.D.)
Award Type: Doctorates > Ph.D.
Supervisor(s):
Supervisor(s)EmailORCID
Tsolakis, AthanasiosUNSPECIFIEDUNSPECIFIED
Dearn, KarlUNSPECIFIEDUNSPECIFIED
Licence:
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/5439

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