Methods to improve the yield of Claus sulfur recovery unit

The factors that affected the yield of the sulphur recovery were analyzed based on a Claus sulfur recovery unit,the results showed that reaction temperature,sour gas composition,catalyst,process and equipment affected the yield substantially.Some optimizing measures were put forward to improve the yield,which included:①using master and auxiliary controlling valve to lower the influence of sour gas flow rate variation;② using on-line H_2S/ SO_2 ratio analyzer to control the proportion of reactants,③preheating air and sour gas to deal with the sour gas containing ammonia;④selecting high-performance catalyst;⑤regulating high-temperature mixing valve to control operating temperature of primary converters;⑥using process gas heat exchanger to heat and control the operating temperature of secondary converters through the bypass.