Control method and practice of pressure drop in dry gas desulfurization tower.

Solution to the high pressure drop in the dry gas desulfurization tower of a certain company' s liquid phase diesel hydrogenation unit was introduced. The main measures to control the pressure drop of dry gas desulfurization tower are determined through the combination of Storks law theory analysis and experiments, including reducing the flow rate of sulfur-containing dry gas and solving the problem of packing layer blockage. The results show that if the sulfur-containing dry gas flow rate was reduced from 7,600 m³/h to 6,500 m³/h, the pressure drop of the dry gas desulfurization tower was decreased by 6. 5 kPa, and the effect was poor. The blockage of the filling layer is mainly due to the large amount of high carbon solid particles in the upstream lean amine solution, which suspend and settle in the lean amine solution. According to Storks law and utilizing this drag force characteristic, the settling speed of solid black particles is 0. 012 m/s. Therefore, through the full tower operation, the lean amine solution inside the packing tower was quickly sent out, and the high-speed flow generated drag force opposite to settlement, which was enough to suspend it and remove a large number of high carbon solid particles from the packing. The pressure drop of the dry gas desulfurization tower was quickly decreased from 53 kPa to 1 kPa. The problem of high pressure drop caused by blockage of high carbon solid particles in the packing layer was solved, with strong operability and significant effects. [ABSTRACT FROM AUTHOR]