FCC feed injection with non-quiescent mixing

Details FCC feed injection with non-quiescent mixing FCC feed injection with non-quiescent mixing

1996-10-02

1998-01-06

McMahon, Timothy

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Fluidized bed

422143, 208163, F27B 1508

Patent

active

057051305

ABSTRACT:
An FCC feed distributor mixes fresh catalyst entering the riser with steam to create a dense bubbling bed of catalyst. Fluidized catalyst rises from the dense bed around a conical section supported from the bottom of the riser. The conical section accelerates the catalyst by reducing the flow area into a small width annulus. As fast fluidized catalyst flows to the annulus, a diverter outwardly redirects an axially flowing feed stream to discharge feed radially into the catalyst as it flows by the annular section. A narrow width of the annular section provides good penetration of the catalyst stream by the feed to quickly and completely mix the catalyst and feed. A tapered conical section above the narrow annular section provides an extended region of gradually increasing flow area that controls downstream acceleration of the gas and catalyst mixture by permitting expansion and preventing back mixing over the initial stages of the cracking reaction. This arrangement improves the uniformity of gas and catalyst contacting while reducing the amount of steam or other dispersion gas required to achieve good catalyst and feed contact.

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