Abstract: The phenomenon that the dipleg of the second-stage cyclone in the regeneration system of FCC unit are blocked at several places in a petrochemical enterprise is introduced, and analyzes the reason of catalyst loss caused by its failure. By changing the installation angle of the cyclone separator wing valve(the static test mass is changed from 1.5 kg to 1.0 kg), the elevation(the weld elevation of 12 wing valves is increased by 100 mm), the opening direction(the opening direction of 5 wing valves is changed to point to the center of the regenerator), adjusting the height of the dipleg, increasing the fluidization air distribution pipe and other measures, the problem of the blockage of the dipleg of the second-stage cyclone has been solved. The results show that by adjusting the installation angle of the wing valve and other measures, the working condition of the second-stage cyclone of the regenerator is stable, and the relevant parameters such as catalyst dust in the flue gas at the outlet of the regenerator are controlled within the range of the process control index, which provides a reference for the long-term operation of the second-stage cyclone and the flue gas energy recovery unit.

Key words: FCC unit, secondary cyclone separator, blockage, wing valve, fault analysis, long-term

摘要： 介绍了某石化企业催化裂化装置再生系统二级旋风分离器多个料腿堵塞的现象，并对其造成的催化剂跑损的原因进行了分析。通过改变旋风分离器翼阀安装的角度(静态试验质量由1.5 kg改为1.0 kg)、标高(12只翼阀焊缝标高均提高100 mm)、开启方向(5只翼阀开启方向改为指向再生器中心),调整料腿高度，增加流化风分配管等措施，解决了二级旋风分离器料腿堵塞的问题。通过采取上述措施后，再生器二级旋风分离器工况稳定，再生器出口烟气中催化剂粉尘等的相关参数均在工艺控制指标范围。该实施结果为二级旋风分离器和烟气能量回收机组的长周期平稳运行提供参考。

关键词: 催化裂化装置, 二级旋风分离器, 堵塞, 翼阀, 故障分析, 长周期