February 2019

Process Optimization

Feed nozzle effects on yields and operation of FCCUs

The first-generation, proprietary feed distributorsa had open-pipe bayonets that were located at the base of the wye section/riser.

The first-generation, proprietary feed distributorsa had open-pipe bayonets that were located at the base of the wye section/riser. These distributors evolved in the early 1970s to obtain better feed dispersion by injecting steam upstream of the feed distributor with various showerhead tip designs. These tip designs—which emerged in the late 1970s—placed a greater emphasis on atomizing oil into finer droplets and uniform distribution. The stream is injected into the fluid catalytic cracker’s (FCC’s) feed upstream of the distributor. The combined stream is premixed inside the distributor, producing a pseudo-emulsion phase. The steam expands at the tip and the feed is broken up into small drop

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