小型连续卸剂系统在催化裂化装置中的应用分析

Application analysis of small continuous unloading system in catalytic cracking unit

催化裂化装置反再系统催化剂需连续加注新鲜催化剂来维持活性、选择性等,持续加剂导致反再系统催化剂藏量增大、料位增高,加大了旋风分系统负荷,旋风效果降低,烟机入口催化剂颗粒物浓度高,烟机容易结垢。目前普遍采用人工定期卸剂,通过阀门开度控制卸剂温度,不仅阀门易磨损损坏且卸剂温度很难控制,普遍存在超温磨损引起催化剂卸剂管线频繁泄漏等问题。某炼油厂2 Mt/a催化裂化装置采用再生器催化剂小型连续卸剂系统,可以较好的恒定催化剂藏量,稳定再生器料位,更好的控制催化剂活性,烟机入口颗粒物明显下降,降低岗位现场工作量。同时每次卸剂量小,输送风量占卸剂比大,能实现卸剂温度可控,确保上游管线壁温低于540℃,下游翅片管线的壁温低于343℃,缓解高温催化剂对卸剂线上阀门管线的磨损。

Catalyst fine powder of catalytic cracking plant regeneration system is not easy to replace,and fresh catalyst should be added continuously to maintain the activity,but the load of cyclone separation system is increased and the amount of two devices is fluctuating,and the concentration of particulate matter in the catalyst at the entrance of the smoke machine is high,resulting in the use of catalyst.Large,the smoke machine is easy to scale.Manual unloading increases the manual workload,the temperature of unloading agent is difficult to control,and excessive temperature wear causes frequent leakage of catalyst unloading pipeline.The 2 Mt/a catalytic cracking device of a refinery adopts a small continuous unloading agent system of regenerator catalyst,which can maintain a constant catalyst storage amount,stabilize the regenerator material position,better control the catalyst activity,and reduce the workload on the job site.At the same time,each discharge dose is small,and the amount of conveying air accounts for the discharge agent ratio.The discharge temperature can be controlled,ensuring that the wall temperature of the upstream pipeline is lower than 540℃,and the wall temperature of the downstream fin pipeline is lower than 343℃,which relieves the wear of the pipeline by the high temperature.