炼厂脱硫系统的模拟和改造

With the trend of processing sulfur-containing crude oil, the circulation of desulfurization solvent is increasing in refineries, which raises the energy consumption for solvent regeneration dramatically. In this paper, Aspen HYSYS is used to simulate a group of desulfurization units, and the minimum desulfurization solvent circulation of each unit is obtained. On this basis, two retrofitting methods, cascaded operation and cascaded-parallel operation, are put forward and used to retrofit the desulfurization system. The results show that the desulfurization solvent circulation can be reduced by 8.82% and 10.01% through the two methods, respectively, and have achieved good economic benefits. Finally, the advantages and disadvantages of the two methods are analyzed and discussed, which provides directions and suggestions for the optimization of refinery desulfurization system.