超短接触时间催化裂化反应器的开发及实验研究

根据超短接触时间催化裂化工艺的特点，开发了具有新型原料雾化和剂、油接触方式的下行式反应器。冷模实验结果表明，该反应器的剂、油初始接触区具有较高的催化剂质量浓度；通过在催化剂提升区设置开孔板形内构件，可以改善催化剂提升区床层上部催化剂的流化状态，从而有效地抑制催化剂返混。下行管内催化剂的速度和浓度分布的均匀性均明显优于提升管；降低下行管表观气速或加大催化剂循环强度有利于提高下行管内催化剂质量浓度，但同时也会增加催化剂在下行管内分布的不均匀性。

DEVELOPMENT AND EXPERIMENTAL STUDY OF THE CATALYTIC CRACKING REACTOR FOR ULTRA-SHORT CONTACT TIME

A newly down flow reactor with new ways of feed atomization and oil catalyst contact was developed according to the characteristic of ultra short contact time catalytic cracking process. The results of experiment on a cold model showed that the catalyst concentration in the zone where oil contacted catalyst initially was quite high in this reactor, orifice plate set in the catalyst pre lift zone of the reactor could improve the fluidization and bate the back mixing of catalyst; the velocity and concentration of catalyst in the down flow reactor were obviously more well proportioned than that in the riser reactor; reducing the apparent velocity of gas or increasing the recycling intensity of catalyst could increase the catalyst concentration in the downer, but would reduce the uniformity of catalyst distributing.