Abstract:

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.

Key words: hydrocarbon desulfurization tower, pressure drop, packing layer blockage, high carbon solid particles, Storks law, settling speed, drag force analysis

摘要：

介绍了某公司液相柴油加氢装置干气脱硫塔压力降高的解决方法。通过Storks定律理论分析与试验相结合的方法，确定控制干气脱硫塔压力降主要措施：降低含硫干气流量和解决填料层堵塞问题。将含硫干气流量由7 600 m³/h降至6 500 m³/h,干气脱硫塔压力降下降6.5 kPa,效果不佳。填料层堵塞主要是因上游贫胺液中含有大量高碳固体颗粒，且其在贫胺液中悬浮沉降。根据Storks定律并利用该项曳力特征，固体黑色颗粒沉降速度为0.012 m/s,故通过满塔操作快速外送填料塔内贫胺液，高速流动产生与沉降相反的曳力足以使其悬浮，将大量高碳固体颗粒从填料中清除，干气脱硫塔压力降从53 kPa快速降至1 kPa,解决了填料层因高碳固体颗粒物堵塞而导致压力降高的问题，可操作性较强，效果显著。

关键词: 干气脱硫塔, 压力降, 填料堵塞, 高碳固体颗粒, Storks定律, 沉降速度, 曳力分析