Effect of carbon dioxide on oxy-fuel combustion of hydrogen sulfide: An experimental and kinetic modeling

doi:10.1016/j.cjche.2022.11.014

Abstract

Abstract: CO₂ is an important component in the acid gas and it is necessary to study the effect of CO₂ presence on the oxy-fuel combustion of H₂S with particular focus on the formation of carbonyl sulfide (COS). The oxy-fuel combustion of acid gas was conducted in a coaxial jet double channel burner. The distribution of flame temperature and products under stoichiometric condition along axial (R = 0.0) and radial at about 3.0 mm (R = 0.75) were analyzed, respectively. The Chemkin-Pro software was used to analyze the rate of production (ROP) for gas products and the reaction pathway of acid gas combustion. Both experimental and simulation results showed that acid gas combustion experienced the H₂S chemical decomposition, H₂S oxidation and accompanied by H₂ oxidation. The CO₂ presence reduced the peak flame temperature and triggered the formation of COS in the flame area. COS formation at R = 0.0 was mainly through the reaction of CO₂ and CO with sulfur species, whereas at R = 0.75 it was through the reaction of CO with sulfur species. The ROP results indicated that H₂ was mainly from H₂O decomposition in the H₂S oxidation stage, and COS was formed by the reaction of CO₂ with H₂S. ROP and other detailed analysis further revealed the role of H, OH and SH radicals in each stage of H₂S conversion. This study revealed the COS formation mechanisms with CO₂ presence in the oxy-fuel combustion of H₂S and could offer important insights for pollutant control.

Key words: Carbon dioxide, Oxy-fuel combustion of H₂S, Reaction pathway, Kinetics, Oxidation

摘要： CO₂ is an important component in the acid gas and it is necessary to study the effect of CO₂ presence on the oxy-fuel combustion of H₂S with particular focus on the formation of carbonyl sulfide (COS). The oxy-fuel combustion of acid gas was conducted in a coaxial jet double channel burner. The distribution of flame temperature and products under stoichiometric condition along axial (R = 0.0) and radial at about 3.0 mm (R = 0.75) were analyzed, respectively. The Chemkin-Pro software was used to analyze the rate of production (ROP) for gas products and the reaction pathway of acid gas combustion. Both experimental and simulation results showed that acid gas combustion experienced the H₂S chemical decomposition, H₂S oxidation and accompanied by H₂ oxidation. The CO₂ presence reduced the peak flame temperature and triggered the formation of COS in the flame area. COS formation at R = 0.0 was mainly through the reaction of CO₂ and CO with sulfur species, whereas at R = 0.75 it was through the reaction of CO with sulfur species. The ROP results indicated that H₂ was mainly from H₂O decomposition in the H₂S oxidation stage, and COS was formed by the reaction of CO₂ with H₂S. ROP and other detailed analysis further revealed the role of H, OH and SH radicals in each stage of H₂S conversion. This study revealed the COS formation mechanisms with CO₂ presence in the oxy-fuel combustion of H₂S and could offer important insights for pollutant control.

关键词: Carbon dioxide, Oxy-fuel combustion of H₂S, Reaction pathway, Kinetics, Oxidation

Xun Tao, Fan Zhou, Xinlei Yu, Songling Guo, Yunfei Gao, Lu Ding, Guangsuo Yu, Zhenghua Dai, Fuchen Wang. Effect of carbon dioxide on oxy-fuel combustion of hydrogen sulfide: An experimental and kinetic modeling[J]. Chinese Journal of Chemical Engineering, 2023, 59(7): 105-117.

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