两段加氢生产溶剂油工艺优化

Optimization of two-stage hydrogenation technology for producing solvent oils

通过实验确定了抽余油一段、二段加氢所需氢油体积比,一段氢油体积比50~100,二段250~300。针对目前抽余油两段加氢工艺存在的一段高温低氢油体积比、二段低温高氢油体积比的特点,提出两段加氢工艺改进方案。采用分别控制一段、二段氢油体积比的方法降低系统能耗。利用Aspen Plus流程模拟软件模拟了改进前后3种工况下系统温度、能耗等变化,结果显示系统能耗降低11.6%~29.8%。

The volume ratio of hydrogen to oil needed for the first stage hydrogenation of raffinate oil is confirmed to be in the range of 50-100 by experiments,and that needed for the second stage hydrogenation is confirmed to be between 250 and 300. An improved two-stage hydrogenation scheme is proposed in the light of the first stage＇s high reaction temperature and low volume ratio of hydrogen to oil,and the second stage＇s low reaction temperature and high volume ratio of hydrogen to oil for the current two-stage hydrogenation of raffinate oil technology.This scheme reduces the system energy consumption through regulating the volume ratios of hydrogen to oil for two stages respectively. Aspen Plus simulation software is used to simulate changes of temperature and energy consumption of the system under three kinds of typical operating conditions.The result indicates that the energy consumption for the system reduces by 11. 6%-29. 8%.