Abstract: Aiming at the influencing factors on SO2 emission in sulfur recovery unit, the protective measures were established. By the integration innovation of new catalyst and process technology, the LS-DeGAS Plus complete technology for reducing SO2 emission concentration in sulfur recovery unit with independent intellectual property rights was developed. The concentration of SO2 emission in the flue gas of the sulfur recovery unit was reduced to below 50 mg/m3, which meets the requirements of the SO2 concentration specified in the national standard “Petroleum Refining Industry Pollutant Emission Standard” (GB 31570—2015). The technology has the characteristics of no secondary pollution, low investment, low energy consumption and easy implementation. It has been promoted and applied for 58 sets in China.

Key words: surfur recovery unit, SO2 emission concentration, catalyst