半再生立管输送催化剂不畅的原因分析和改进措施

催化裂化装置中半再生立管是重叠式两段再生器之间催化剂循环的输送管。半再生立管在操作中常出现催化剂输送不畅的问题,直接影响到装置的平稳运行和催化剂的再生效果。依据两段再生器之间颗粒循环回路的压力平衡分析,半再生立管输送催化剂不畅的主要原因是立管入口进料、出口排料不畅造成下行回路立管的推动力不足。改进立管的入口进料、出口排料,松动风的设置等可以有效地提高立管输送催化剂的能力,解决半再生立管输送催化剂不畅的问题。

ANALYSIS OF CATALYST CONVEYING FAULT IN SEMI-REGENERATIVE STANDPIPE OF FCCU AND RELATED MEASURES

The semi-regenerative standpipe is used for conveying catalyst between stacked two-stage regenerator in the FCC unit. Abnormal catalyst transportation occurred in standpipe during operation, which directly affected the unit operation and catalyst regeneration efficiency. Based on the analysis of the pressure balance of particle circulation loop, the cause is being the obstacle in inlet feed and outlet discharge, resulting in not enough driven force in the pipe for catalyst downward. By optimizing the fluxes of particle feed and discharge and controlling the loosen wind rate, the capacity of the catalyst transportation in standpipe can be effectively improved.