A CO incinerator or CO boiler is used to produce an acceptable flue gas composition. Lift air and the air to regenerator two are burned and exit the second
regenerator and is recombined with the flue gas from regenerator one. Several
flue gas combination schemes have been used.
Reactor product
RCC Process
High Quality Paraffinic Resids
Commercial Design
Reactor riser
Residue diluents
Diluents
Flue gas
Two stage
regenerator
Primary air
• High Eff Regen
• Total Combustion
• Sox Acceptor
• Catalyst Cooler
• Lift Gas/Feed
Distributor
Feed Temp
Diluents
• Vented Riser
Catalyst
cooler
Secondary
air
Fig. 19 UOP resid designs
Air
Swirl-tube
separator
To power
recovery
To power
recovery
Product
Product
Steam
Steam
Resid
Resid
Catalyst
coolers
Air
Air
Fig. 20 Shell resid crackers
286
W. Letzsch