Swirl stability and emission characteristics of CO-enriched syngas/air flame in a premixed swirl burner

Samiran, N. A. and Ng, Jo-Han and Mohd Jaafar, Mohammad Nazri and Valera-Medinad, Agustin and Tung, Chong Cheng (2017) Swirl stability and emission characteristics of CO-enriched syngas/air flame in a premixed swirl burner. PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, 112. pp. 315-326. ISSN 0957-5820

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Abstract

There is significant variation in the composition of synthesis gas derived from biomass, coal or waste. The inconsistency of syngas constituents poses challenges and requires thorough characterisation prior to use as alternative fuel in practical combustion system. The present study investigates the combustion and emission characteristics of CO-enriched syngases by using an atmospheric premixed swirl flame burner. High (CO/H2 = 3) and moderate (CO/H2 = 1.2) CO-enriched syngases were fully premixed with air and diluents of CH4 and CO2 prior to ignition atthe burner outlet. Direct flame imaging shows that moderate CO-enriched syngas produces less luminous flames than high CO-rich syngas, signifying less tendency to form soot. Moderate CO-rich syngases show more compact flames with higher intensity owing to higher H2 contents. The blowout test shows that higher CO content syngases result in lean blowout at higher equivalence ratios, posing stability issues. High fractions of unreactive CO2 and reactive CH4 in syngases result in higher lean blowout limit. Emissions wise, high CO-rich syngases show evidently less NOx emissions as compared to baseline pure CO flames at increasing equivalence ratios. Moderate CO-rich flame exhibits higher NOx level than high CO-rich at < 0.8. However, at fuel-stoichiometric and fuel-rich regions they display similar levels of NOx. Higher fraction of CO2 dilution results in reduction of NOx emissions, with pronounced impact on fuel-rich cases. There was minimal effect on CO emissions with increased dilution of CO2.

Item Type:	Article
Uncontrolled Keywords:	CO-rich; Syngas; Lean blowout limit; Stability; Emissions; Premixed flame
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ751-805 Miscellaneous motors and engines Including gas, gasoline, diesel engines T Technology > TP Chemical technology > TP315-360 Fuel
Divisions:	Faculty of Engineering Technology > Department of Mechnical Engineering Technology
Depositing User:	UiTM Student Praktikal
Date Deposited:	04 Jan 2022 03:10
Last Modified:	04 Jan 2022 03:10
URI:	http://eprints.uthm.edu.my/id/eprint/5046

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