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Effect of H2S in methane/air flames on sulfur chemistry and products speciation

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

Abstract

Reaction behavior of H2S/O2 under different equivalence ratios in methane/air flames is examined. Three equivalence ratios extending from fuel-lean ([Phi]Â =Â 0.5), stoichiometric ([Phi]Â =Â 1.0), to fuel-rich (Claus condition, [Phi]Â =Â 3.0) are examined. The results revealed that the presence of H2S prevents hydrogen oxidation in the primary reaction zone, while in the secondary reaction zone oxidation competition occurs between H2 and H2S. In presence of oxygen, oxidation of hydrogen sulfide forms sulfur dioxide. However, under Claus conditions, the depletion of oxidant causes the direction of hydrogen sulfide reaction to shifts towards the formation of elemental sulfur. Higher hydrocarbons are formed in trace amounts under Claus conditions wherein sulfur dioxide acts as a coupling catalyst which enhances the dimerization of CH3 radical to form higher series of hydrocarbons. Under Claus conditions, sulfur deposits are formed in low temperature regions of the reactor including the sampling line. The deposits are analyzed using X-ray powder diffractometer and were found to be cyclo-S8 ([alpha]-sulfur) with orthorhombic crystal structure. The formation of [alpha]-sulfur is mainly due to the agglomeration of elemental sulfur (S2) during its condensation at low temperatures.

Suggested Citation

  • Selim, H. & Al Shoaibi, A. & Gupta, A.K., 2011. "Effect of H2S in methane/air flames on sulfur chemistry and products speciation," Applied Energy, Elsevier, vol. 88(8), pages 2593-2600, August.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:8:p:2593-2600
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    Citations

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    Cited by:

    1. Ibrahim, S. & Al Shoaibi, A. & Gupta, A.K., 2014. "Toluene destruction in thermal stage of Claus reactor with oxygen enriched air," Applied Energy, Elsevier, vol. 115(C), pages 1-8.
    2. Ibrahim, S. & Al Shoaibi, A. & Gupta, A.K., 2013. "Role of toluene in hydrogen sulfide combustion under Claus condition," Applied Energy, Elsevier, vol. 112(C), pages 60-66.
    3. Selim, H. & Ibrahim, S. & Al Shoaibi, A. & Gupta, A.K., 2014. "Investigation of sulfur chemistry with acid gas addition in hydrogen/air flames," Applied Energy, Elsevier, vol. 113(C), pages 1134-1140.
    4. Selim, H. & Al Shoaibi, A. & Gupta, A.K., 2011. "Experimental examination of flame chemistry in hydrogen sulfide-based flames," Applied Energy, Elsevier, vol. 88(8), pages 2601-2611, August.
    5. El-Melih, A.M. & Al Shoaibi, A. & Gupta, A.K., 2017. "Reformation of hydrogen sulfide to hydrogen in the presence of xylene," Applied Energy, Elsevier, vol. 203(C), pages 403-411.
    6. Selim, H. & Gupta, A.K. & Al Shoaibi, A., 2012. "Effect of CO2 and N2 concentration in acid gas stream on H2S combustion," Applied Energy, Elsevier, vol. 98(C), pages 53-58.
    7. El-Melih, A.M. & Al Shoaibi, A. & Gupta, A.K., 2016. "Hydrogen sulfide reformation in the presence of methane," Applied Energy, Elsevier, vol. 178(C), pages 609-615.
    8. Ibrahim, S. & Al Shoaibi, A. & Gupta, A.K., 2015. "Effect of benzene on product evolution in a H2S/O2 flame under Claus condition," Applied Energy, Elsevier, vol. 145(C), pages 21-26.
    9. Li, Yang & Guo, Qinghua & Yu, Xinlei & Dai, Zhenghua & Wang, Yifei & Yu, Guangsuo & Wang, Fuchen, 2017. "Effect of O2 enrichment on acid gas oxidation and formation of COS and CS2 in a rich diffusion flame," Applied Energy, Elsevier, vol. 206(C), pages 947-958.
    10. Selim, H. & Gupta, A.K. & Al Shoaibi, A., 2013. "Effect of reaction parameters on the quality of captured sulfur in Claus process," Applied Energy, Elsevier, vol. 104(C), pages 772-776.
    11. Davazdah Emami, Sina & Kasmani, Rafiziana Md. & Hamid, Mahar Diana & Che Hassan, Che Rosmani & Mokhtar, Khairiah Mohd, 2016. "Kinetic and dynamic analysis of hydrogen-enrichment mixtures in combustor systems – A review paper," Renewable and Sustainable Energy Reviews, Elsevier, vol. 62(C), pages 1072-1082.
    12. Selim, H. & Ibrahim, S. & Al Shoaibi, A. & Gupta, A.K., 2013. "Effect of oxygen enrichment on acid gas combustion in hydrogen/air flames under claus conditions," Applied Energy, Elsevier, vol. 109(C), pages 119-124.
    13. Ibrahim, S. & Al Shoaibi, A. & Gupta, A.K., 2015. "Role of toluene to acid gas (H2S and CO2) combustion in H2/O2–N2 flame under Claus condition," Applied Energy, Elsevier, vol. 149(C), pages 62-68.
    14. Ibrahim, S. & Gupta, A.K. & Al Shoaibi, A., 2015. "Xylene and H2S destruction in high temperature flames under Claus condition," Applied Energy, Elsevier, vol. 154(C), pages 352-360.
    15. Li, Yang & Yu, Xinlei & Li, Hongjun & Guo, Qinghua & Dai, Zhenghua & Yu, Guangsuo & Wang, Fuchen, 2017. "Detailed kinetic modelling of H2S oxidation with presence of CO2 under rich condition," Applied Energy, Elsevier, vol. 190(C), pages 824-834.

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