催化裂化沉降器结焦原因分析及直联加溢流斗防结焦技术的应用

对比中国石化扬子石油化工有限公司2.0 Mt/a催化裂化装置第一、第二运行周期工况及结焦情况，从沉降器结焦机理及不同时期运行参数对比入手，确定沉降器结焦原因为粗级和单级旋风分离器匹配性较差及沉降器内油气停留时间过长所致。沉降器内软连接改为直联+溢流斗防结焦技术的工业应用结果表明，改造后有效地避免了沉降器结焦，同时干气、柴油及焦炭产率分别降低0.26，0.25，0.54百分点，液化气、汽油及油浆产率分别上升0.54，0.33，0.18百分点，油浆固含量由4.1 g/L降至2.0 g/L，显示出极佳的防结焦及运行效果。

ANALYSIS OF COKING IN DISENGAGER AND APPLICATION OF ANTI-COKING TECHNOLOGY WITH DIRECT CONNECTION AND OVERFLOW BUCKET

Based on the comparing the operating parameters and coking situations in the first and second operating cycles of the 2.0 Mt/a FCC unit of SINOPEC Yangzi Petrochemical Co. Ltd., the causes of the coking in disengager were analyzed. It was determined that the coking in the disengager is caused by poor cyclone matching and the long oil and gas retention time in the disengager. For this reason, the soft connection of the disengager was changed to a direct coupled plus overflow bucket configuration. The results showed that the disengager coking was effectively avoided, while reducing the dry gas, diesel and coke yields by 0.26, 0.25 and 0.54 percentage point, respectively. The yield of LPG, gasoline and slurry was increased by 0.54, 0.33 and 0.18 percentage point, respectively. The solid content of the slurry was reduced from 4.1 g / L to 2.0 g / L, showing excellent anti-coking and improved operating effects.