Effect of air-fuel ratio on temperature distribution and pollutants for biogas MILD combustion

Noor, M. M. and Wandel, Andrew P. and Yusaf, Talal (2014) Effect of air-fuel ratio on temperature distribution and pollutants for biogas MILD combustion. International Journal of Automotive and Mechanical Engineering, 10 (1). pp. 1980-1992. ISSN 2229-8649

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Abstract

This paper examines the effect of air-fuel ratio for Moderate or Intense Low oxygen Dilution (MILD) combustion using a bluff-body burner. Exhaust gas recirculation was
used to dilute the oxidizer stream prior to the combustion chamber. A low-calorie biogas fuel which consists of 60% methane and 40% carbon dioxide were used in the simulations using a Reynolds-averaged Navier–Stokes model with the realizable k-epsilon turbulence model. The chamber temperature distribution was found to be in small ranges and almost homogeneously distributed, verifying that MILD conditions were attained. The performance was evaluated based on the level of pollutants (Unburned hydrocarbons (UHC) and carbon-mono oxide (CO)) produced and measured in the exhaust gas. Slightly lean conditions produced negligible pollutants with some excess oxygen measured in the exhaust gas. Under rich conditions, UHC and CO were produced, but when synthetic air containing oxygen with a mole fraction of 7% was used as the oxidizer instead of ordinary air, these levels were significantly reduced.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © Universiti Malaysia Pahang 2014. Open access journal. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 26 Dec 2014 12:06
Last Modified: 10 Apr 2017 02:26
Uncontrolled Keywords: MILD combustion; biogas; air-fuel ratio; exhaust gas recirculation; unburned hydrocarbon
Fields of Research : 09 Engineering > 0913 Mechanical Engineering > 091305 Energy Generation, Conversion and Storage Engineering
09 Engineering > 0904 Chemical Engineering > 090405 Non-automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels)
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi:10.15282/ijame.10.2014.15.0166
URI: http://eprints.usq.edu.au/id/eprint/26490

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