高硫渣油加氢反应动力学模型与失活模型的耦合应用

Coupling Application of High-Sulfur Residues Hydrotreating Reaction Kinetics and Deactivation Model

通过研究不同工艺条件(反应温度、压力和体积空速)对高硫渣油加氢处理反应的影响,构建了高硫渣油加氢脱硫、加氢脱氮、加氢脱残炭、加氢脱金属反应的动力学模型,并与颗粒活性区迁移模型(失活模型)进行耦合,从而利用耦合模型对渣油加氢装置的升温曲线、非常规操作及产品性质进行了模拟预测。模拟结果表明:经耦合模型模拟所得各反应转化率的预测值与试验值吻合度高;在加氢催化剂的整个评价周期内,随着加氢催化剂金属沉积比例增加,各反应转化率均呈现初期快速下降、中期缓慢下降、末期快速下降的规律;模拟产品性质恒定条件下加氢脱硫、加氢脱氮和加氢脱残炭反应的升温曲线,可以得到装置推荐的升温曲线。

Effects of different process conditions(reaction temperature,pressure and volume space velocity)on high-sulfur residues hydrotreating(RHT)reactions were studied to build reaction kinetic models for hydrotreating desulfurization(HDS),hydrotreating denitrogenization(HDN),hydrotreating de-carbon-residues(HDCCR),hydrotreating de-metals(HDM).Then,through coupling with active-zone-migration(deactivation)model,RHT unit can be simulated and predicted.Simulation results suggest that the coupling model predicted conversion ratios of each reaction are consistent with experimental data.As metal-deposition ratio increases,conversion ratio of each reaction declines rapidly in the initial stage,then declines slowly in the middle stage,but declines rapidly again in the final stage.In addition,under the condition of constant product properties,temperature ramp profiles recommended for unit can also be obtained through temperature ramp profiles simulation of HDS,HDN and HDCCR reactions.