催化裂化提升管进料混合段研究进展

摘要

Riser reactor is one of the most important units in the FCC process. In the feed injection-mixing zone of the riser reactor, the contact and flow conditions of oil and catalysts will directly affect the FCC reaction. The present research about gas-solid flow behaviors in the conventional feed injection zone indicates that the catalysts distribute quite unevenly in the feed injection zone, which is harmful for the contact and reaction of oil and catalysts. To solve the disadvantages of riser feeding mixed segment, domestic and overseas researchers put forward some improvement methods, including changing the way of air inlet, appending the internals and transforming the diameter of the riser.%催化裂化是炼油工业中重要的二次加工过程，提升管反应器是催化裂化装置的核心部分，其中的进料混合段是原料油与催化剂的初始接触阶段，该区域油、剂间的接触与混合效果将对裂化反应的产品分布产生直接影响。在传统的提升管进料段结构中，存在着催化剂分布不均匀、颗粒返混严重等问题，不利于实现油、剂间快速而均匀的混合与反应。针对提升管进料混合段内存在的缺点与不足，国内外研究者提出了诸多改进方法，其中改变进气方式、增加内构件、提升管变径等方案的效果较为显著。