Discussion on tail gas SO₂ emission reduction measures of a high-sulfur natural gas purification plant

Using chemical simulation software to establish a model for sulfur recovery and tail-gas treatment process in a high-sulfur natural gas purification plant, and taking the SO₂ emission mass concentration of 400 mg/m³ as the standard to simulate two schemes: reduction-absorption process and oxidation-absorption process. The results showed that both schemes could achieve SO₂ emission reduction. After analyzing the process maturity and economic investment, the oxidation-absorption process had the characteristics of simple flow and low initial investment. The oxidation-absorption tail gas treatment process was recommended to the purification plant to reduce the SO₂ emission.