Spatial speciation of H2S combustion in methane/air mixtures

H. Selim, A. Al Shoaibi, A. K. Gupta

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Examination of H2S combustion in methane/air mixtures under different equivalence ratios is carried out to determine the fate of sulfur. A range of equivalence ratios extending from fuel-lean (Φ=0.5), stoichiometric (Φ=1.0), to fuel-rich (Claus condition, Φ =3.0) are examined here. Hydrogen sulfide was premixed with both methane and air prior to the injection of mixture into the combustor. Spatial gas sampling was carried out both axially and radially along the reactor at various locations downstream of the reactor. Because of the premixed conditions oxidation competition between H2S and CH4 was found to be significant. This imposed the reaction of H2S to form SO2 rather than sulfur (S2). Consequently, sulfur dioxide showed a consistent (almost-constant) trend under all equivalence ratios. The result revealed that carbon sulfide (CS2) is formed under both lean and stoichiometric conditions in the reaction zone. The formation of carbon disulfide was found to be due to the reaction of methane with sulfur compounds to form CS2. In addition, other intermediate species, such as, CH reacts with H2S to form CS2 as well. Higher hydrocarbons (ethane and ethylene) were observed under Claus conditions. This is attributed to the coupling catalytic effect of SO2 which enhances the dimerization of CH3 to form ethane. Dehydrogenation of ethane forms ethylene. Under stoichiometric and lean conditions higher hydrocarbons were not formed due to the lack of high SO2 concentration in the reaction pool.

Original languageBritish English
Title of host publication9th Annual International Energy Conversion Engineering Conference, IECEC 2011
StatePublished - 2011
Event9th Annual International Energy Conversion Engineering Conference, IECEC 2011 - San Diego, CA, United States
Duration: 31 Jul 20113 Aug 2011

Publication series

Name9th Annual International Energy Conversion Engineering Conference, IECEC 2011

Conference

Conference9th Annual International Energy Conversion Engineering Conference, IECEC 2011
Country/TerritoryUnited States
CitySan Diego, CA
Period31/07/113/08/11

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