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Acid gas combustion in the pure oxygen atmosphere for decreasing sulfur dioxide formation under Claus conditions
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DOI：10.1016/j.cjche.2025.12.049.png)
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Abstract
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As an auxiliary method in the acid gas (H2S<50.0% (vol)) combustion, fuel gas combustion generally promoted the SO2 production, which is unfavorable for improving sulfur recovery efficiency. In this research, pure oxygen combustion method was applied to the acid gas combustion for decreasing SO2 production. An equilibrium model was utilized to perform a thermodynamic analysis of acid gas combustion, and combustion experiments were performed in a coaxial jet double channel burner for analyzing the distribution of flame temperature and gas concentration during the pure oxygen combustion and CH4 co-combustion, respectively. The results indicated that pure oxygen combustion of acid gas could decrease the SO2 formation and increase the S2 yield compared to the fuel gas combustion of acid gas. S2 yield maintained stable at different equivalence ratios, and in the pure oxygen combustion its yield was higher about 3.5 percentage points compared to the fuel gas combustion, and SO2 yield was decreased by about 1.21 percentage points when the H2S/SO2 value was closer to the ideal value of 2.0. SO2 was mainly formed in the oxidation process of H2S, and the formation of S2 was in the whole H2S combustion process under Claus conditions. The formation of SO2 was mainly through the oxidation reaction between the sulfur species released by H2S. The application of pure oxygen combustion to acid gas with a H2S concentration below 50.0% (vol) achieve the objective of decreasing SO2 formation and forming a stable flame under Claus conditions.
Keywords:
pure oxygen combustion
sulfur dioxide formation
acid gas combustion
Claus conditions
S2 yield
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