渣油加氢废催化剂热解-冷凝协同回收油技术研究OACHSSCD

To address insufficient desorption of heavy oil from spent residue hydrotreating catalysts and limited condensation efficiency of pyrolysis gas,a synergistic process integrating segmented temperature-controlled pyrolysis in a rotary kiln with three-stage gradient condensation is developed.Single-factor experiments are conducted to investigate the effects of pyrolysis temperature,material residence time,and condensation temperature gradient on oil recovery,and the appropriate process parameters are determined as follows:temperatures of 520℃and 550℃for Zones I and II,respectively;a material residence time of 90 min;and three-stage condensation temperatures of 140℃,80℃,and 20℃.The results show that under the optimized conditions,the oil recovery reaches 94.2%,the residual oil content decreases to 0.25%,and the energy consumption is 265(kW·h)/t.The diesel fraction accounts for 72.8%of the recovered oil,with a sulfur content of 98 μg/g,indicating its potential for further utilization through hydrofining.The proposed process enables efficient desorption and fractionated recovery of heavy oil,providing a technical reference for the resource utilization of spent residue hydrotreating catalysts.