极低负荷下克劳斯硫磺回收衍生工艺的应用研究OA

In conventional sulfur recovery and tail gas treatment processes at natural gas purification plants,there exists a problem that low-heat sulfur cannot be recovered under extremely low load conditions.Typically,this can only be addressed by replacing equipment or improving the process.However,this not only increases investment and extends the modification cycle but also reduces the return rate.This study explores a derivative Claus sulfur recovery process under extremely low load to address the problems of insufficient existing design lower limit and high system temperature control.Research results show that the innovative application of a sub-heat Claus sulfur recovery process can reduce the conventional Claus bed control temperature.The temperatures in the primary and secondary Claus reactors are 50～100℃ lower than those in conventional Claus reactors.This expands the operational range of the conventional Claus process and effectively meets the requirements for normal operation of sulfur recovery and tail gas treatment units under extremely low load.Meanwhile,operation with excess air can achieve non-precise control of the H2S to SO2 ratio at 2∶1,reducing operational difficulty.Field application results show that the derivative Claus sulfur recovery process under extremely low load can achieve a total sulfur recovery rate exceeding 99.8％,with tail gas SO2 emission concentration below 100 mg/m3,far lower than national emission standards.The derivative Claus sulfur recovery process under extremely low load has lower operational difficulty,providing greater flexibility and simplicity for operating the sub-heat Claus sulfur recovery process under extremely low load,and can serve as a reference for similar units.