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Biogas upgrade through exhaust gas reforming process for use in CI engines

Lau, Chia Sheng (2012)
Ph.D. thesis, University of Birmingham.

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Abstract

Biogas is not ideal for combustion in diesel engines mainly due to its low energy content. The upgrading of biogas into high quality syngas through catalytic reforming reactions was investigated. Studies on the effect of temperature, space velocity and O\(_2\)/CH\(_4\) molar ratio on various basic biogas reforming processes were done. The dry reforming of biogas was found to be active at high reactor temperatures with syngas production and reduction of carbon dioxide. The promotion of simultaneous dry and oxidative reforming by adding oxygen improves syngas production at conditions of low temperature and high space velocity. Subsequently, the biogas exhaust fuel reforming process was done by feeding real engine exhaust together with biogas into the reforming reactor. Reforming process efficiency of 95% (ratio of energy content of reformate to biogas) was achieved at high space velocity and high content of steam in exhaust at medium engine load (300°C exhaust temperature). Further improvement was observed when reformed exhaust gas recirculation (REGR) was applied due to increased exhaust steam content in the engine – reactor system which promoted the endothermic steam reforming reaction. Moreover, improved engine thermal efficiency and lower emissions were found during reformate gas-diesel operation compared to biogas-diesel operation.

Type of Work:Ph.D. thesis.
Supervisor(s):Tsolakis, Athanasios and Wyszynski, Miroslaw L.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Mechanical Engineering
Subjects:TD Environmental technology. Sanitary engineering
TJ Mechanical engineering and machinery
TL Motor vehicles. Aeronautics. Astronautics
Institution:University of Birmingham
ID Code:3472
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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