FCCU旋风分离器入口速度对催化剂跑损的影响

Effect of Cyclone Inlet Velocity on the Catalyst Loss in FCCU

在催化裂化工艺中,旋风分离器用于催化剂与油气或与烟气的分离操作,是决定催化剂跑损的关键设备。旋风分离器的入口速度是一个重要的操作参数,也是影响催化剂跑损的一个主要因素。入口速度过低或过高均可以导致催化剂跑损量的增加,但两者导致催化剂跑损的机制不同。入口速度低于设计值则离心分离能力不足,分离效率下降,跑损催化剂的颗粒粒度分布表现为单峰分布;入口速度高于设计值则导致催化剂颗粒的扩散反弹和破碎,分离效率同样下降,此时跑损催化剂的颗粒粒度分布表现为双峰分布。

The cyclone is used for separating the catalyst particles from oil gas or flue gas in fluid catalytic cracking unit(FCCU), which is a key equipment affecting catalyst loss. The inlet velocity of cyclone is an important process parameter related to the catalyst loss. When the inlet velocity exceeds the designed operating range, the catalyst loss will occur. When the inlet velocity is lower, the centrifugal separation ability is insufficient, the separation efficiency decreases. The particle size distribution of catalyst loss shows a single peak. When the inlet velocity is higher, the catalyst particle will diffuse and wear, and the separation efficiency also decreases. At this time, the particle size distribution shows a double peak.