A termination or separation system is used at the top of the riser. These have been
simple tees (T), rough-cut cyclones, or specialized inertial separators. Most recently,
the riser termination devices have all been close-coupled systems: connected
cyclones, riser separator strippers (RSS), or vortex separators (VSS). These are
pictured in Fig. 9 and all are directly connected to the secondary cyclones.
Riser Separation System (RS
2 )
Anti Coking
Ring
dipleg
PreStripping
Main
Stripping
Ring
Separation
compartments
Stripping
compartments
Window
connecting
separation
& stripping
chambers
Slip fit for
expansion
Separation Chamber
Stripping Chamber
Stripping
Chamber
Opening for
stripper gas
Stripper
Internals
Riser
Vapor
Catalyst
Riser
Flow
Dense
Bed
Stripping
Steam
Tee
Rough Cut
Cyclones
Vented
Riser
Riser Termination Evolution
Close-Coupled
Cyclones
VORTEX SEPARATOR
Fig. 9 Riser separators
Fluid Catalytic Cracking (FCC) in Petroleum Refining
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