Optimal Control Method of Exit Pollutants of Sulfur Recovery Unit in an Oil Refinery

Due to pollution of the sulfur recovery units in oil and gas refining industry and limititaion of environmental laws, more treatmemnt of sulfur recovery unit's tail gas is needed. In this research, at first, complete study on operational conditions and exit streams had done. Next step was based on knowing of tail gas treating processes, which dry- bed, cold bed absorption, amin- based, redox- based and oxidation processes had known. In continue, sulfur recovery unit of one of the refineries in Iran had selected as a target unit and flowrate and analysis of its tail gas had surveyed. Acoording to results, basic study, environmental limititaion and also tail gas treating processes, amin- based hydrogenation process was selected as an optimum process for efficient removal of sulfurous components of tail gas like sulfur dioxide and hydrogen sulfide in a sulfur recovery unit of target sulfur recovery unit tail gas.