Impact of sour gas composition on ignition delay and burning velocity in air and oxy-fuel combustion
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FinalManuscript_BongartzGhoniem_2015_ImpactOfSourGasComposition.pdf
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Author(s)
Bongartz, Dominik
Ghoniem, Ahmed F
Date Issued
May 2015
Journal
Combustion and Flame
Publisher
Elsevier
Citation
Bongartz, Dominik and Ghoniem, Ahmed F. “Impact of Sour Gas Composition on Ignition Delay and Burning Velocity in Air and Oxy-Fuel Combustion.” Combustion and Flame 162, no. 7 (July 2015): 2749–2757 © 2015 The Combustion Institute
Version
Author's final manuscript
Abstract
Sour gas is an unconventional fuel consisting mainly of methane (CH₄), carbon dioxide (CO₂), and hydrogen sulfide (H₂S) that constitutes a considerable, currently untapped energy source. However, little is known about its combustion characteristics. In this work, we used our recently assembled and validated detailed chemical reaction mechanism to examine some of the combustion properties of sour gas with different compositions in both conventional air combustion and oxy-fuel combustion, the latter being motivated by application in carbon capture and storage. The calculations suggest that raising the H₂S content in the fuel leads to relatively small changes in the flame temperature and laminar burning velocity, but a considerable reduction in the ignition delay time. At elevated pressures, H₂O diluted oxy-fuel combustion leads to higher burning velocities than CO₂ diluted oxy-fuel combustion or air combustion. Mixed CH₄/H₂S flames exhibit a two-zone structure in which H₂S is oxidized completely to sulfur dioxide (SO₂) while CH₄ is converted to carbon monoxide (CO). Formation of corrosive sulfur trioxide (SO₃) mainly occurs during CO burnout.
Keywords
Sour gas
Hydrogen sulfide
Sulfur oxidation
Oxy-fuel combustion
Kinetic mechanisms
Premixed flames
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1016/j.combustflame.2015.04.014
