Closed type rough cyclone quick separation system carrying multiple-riser reactor for catalytic cracking process and catalytic cracking method thereof

The present invention is a fast spin crude closed with multiple points of cracking riser reactor and the catalytic cracking process. The reactor comprises a riser of the present invention, the stripping section, and wherein the reactor crude settler top of the cyclone and the cyclone, the cyclone outlet riser crude oil collecting pipe are connected by the top cyclone inlet . The present invention, by providing a plurality of separate riser, thus, different properties are fed the cracking reaction under suitable reaction environment, according to the respective needs program production apparatus and product quality, improve the yield of the object product. And since the system uses a new riser outlet closed crude fast spin subsystems can effectively shorten the residence time of the cracked oil in the settler, to reduce the rate of coke formation and improve yield of the desired product, which can also ensure long device term operation.