同轴式催化裂化装置汽提段磨损及对策

Wearing of stripping section in coaxial FCCU and countermeasures

同轴式催化裂化装置在生产中出现干气流量增大、吸收系统操作困难,在不停工的情况下,对比操作数据、剖析装置结构,判断出其原因为沉降器汽提段磨损穿孔。通过采取提高汽提段藏量、降低两器差压、提升管干气预提升改为蒸汽预提升等多种措施,成功地解决了吸收系统操作困难的问题,防止了磨损现象进一步加剧,避免反应再生系统发生互串的安全事故。且干气流量由9 t/h恢复到5 t/h左右,氮气体积分数由20%恢复到10%以下,烟机-发电量由0.5 MW恢复到1.0 MW左右,为同类型催化裂化装置发生类似问题的分析和处理,提供了借鉴经验。

The causes of wearing failure of settler stripping section are found out without unit shutdown through detailed analysis of increased gas flowrate of coaxial FCC unit in operation, difficult operation of the absorption system as well as comparison of operating data analysis of the unit structure. The taking of effective measures has successfully solved the problems in operation of absorption system, such as increasing the inven- tory of stripping section, reducing differential pressure between reactor and regenerator, changing dry gas lifting in riser into steam lifting, etc. The deteriorated wearing has been brought under control, and associated short-cut problem and accidents have been prevented. The dry gas flowrate is restored to 5 t/h from 9 t/h, the nitrogen content is returned to 10% （V） from 20% （V） or less, and the power generation capacity of flue gas expander is restored to about 1 MW from 0.5 MW. These provide a good reference for solving the similar problems of the similar FCC units.