Abstract: Three-dimensional numerical simulation of designed burners with different structures which applied to a H₂S incinerator was carried out. The influence of different burner structure parameters, fuel gas composition and distribution ratio, orifice wall structure on the flow and combustion in the furnace were studied, and the suitable burner structure was determined. The results showed that under the original burner structure, reducing the ratio of acidic gas in the inner ring is beneficial to the complete combustion of H₂S, resulting in the increasing temperature of outlet flue gas while the optimized structure which enhances the mixing of acidic gas and air in the inner ring, is more conducive to the combustion of H₂S gas. The structure of orifice wall in the incinerator enables the flue gas backflow in the furnace and the increase of the residence time of flue gas, facilitating the complete combustion of H₂S gas, and mixing methane to the acid gas may cause an incomplete combustion.