Operation and analysis of circulating hydrogen desulfurization system in diesel hydrogenation unit
Carbon steel and low-alloy steel equipment experienced severe corrosion when used in hydrogen sulfide environments.Hydrogen sulfide can not only corrode the surface of materials,but also make a change in the internal structure of steel,resulting in a decrease in its performance and causing significant economic losses and personal safety accidents.The mass concentration of hydrogen sulfide in the circulating hydrogen after desulfurization of a 2.5 Mt/a diesel hydrogenation unit in a petrochemical com-pany frequently exceeded 3 000 mg/m3,posing a high risk of corrosion to subsequent hydrogen pipelines and equipment,and af-fecting the long-term safe operation of the unit.The effects of lean liquid flow rate,column operating pressure,tray opening rate and lean liquid concentration on the efficiency of circulating hydrogen desulfurization were discussed and analyzed.Moreover,process optimization measures were taken to reduce the hydrogen sulfide content,and the mass concentration of hydrogen sulfide in circulating hydrogen after desulfurization was controlled below 500 mg/m3,thus meeting the requirements of environmental protection,while decelerating the corrosion of equipment,and providing references for optimizing production operations.
万方数据
维普
