渣油加氢上流式反应器径向温差问题探析

Discussion on radial temperature difference of upflow reactor of residue hydrogenation

针对中化泉州石化3.30Mt/a渣油加氢处理装置工业运转中上流式反应器床层温度波动大,径向温差大的问题,从原料性质、上流式反应器的设计和操作条件、催化剂的性能设计三方面进行了原因分析。提出了解决思路:改善原料性质和组成,保证原料馏出温度大于538℃的渣油体积比例达到45%以上,避免物流介质黏度大,分配不均匀;优化操作条件,控制上流式二床总氢量不超过60dam3/h,降低气相线速度;调整催化剂的级配,降低上流式反应器催化剂的活性组分和提高催化剂的堆积密度。调整后,上流式反应器床层温度波动、径向温差大的问题得到了有效改善,实现催化剂的高效利用。

In view of the large fluctuation of bed temperature and large radial temperature difference of the upflow reactor in the industrial operation of SINOCHEM Quanzhou Petrochemical 3.30 MM TPY residue hydrotreating unit, the reasons are analyzed from three aspects: the properties of feedstock, the design and operation conditions of the upflow reactor, and the performance design of the catalyst. The solutions are put forward as follows: improving the properties and composition of feedstock, ensuring that the volume ratio of residual oil with distillation temperature higher than 538 ℃ can reach more than 45%, avoiding the high viscosity and uneven distribution of logistics;optimizing operation conditions, controlling the total hydrogen content of upflow two-bed to be no more than 60 dam 3/h, reducing the gas phase line velocity;adjusting the gradation of catalysts, decreasing the active components and increasing the stacking density of catalysts in the upflow reactor. After adjustment, the problems of fluctuation of bed temperature and large radial temperature difference in upflow reactor have been effectively improved, and the efficient utilization of catalyst has been realized.