Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Fluidized bed
Patent
1990-03-05
1992-09-01
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Fluidized bed
422140, 422141, 422145, 422146, 431 7, F27B 1516, B01J 820
Patent
active
051436981
ABSTRACT:
An arrangement is provided for locating internal cooling coils in an FCC regeneration zone that allows control of the cooling coil wall temperature independently of the regeneration zone operation and the circulation rate of cooling fluid through the cooling conduits. The cooling conduits are located within a vessel that contains the combustion section for an FCC regeneration zone. The cooling coils are in a chamber that is closed to catalyst transfer across all of its boundaries except its top. The level of hot regenerated catalyst within the regeneration zone is maintained above the top of the cooling chamber. The addition of flue gas to a lower portion of the cooling chamber provides a random exchange of catalyst particles between the layer of the catalyst bed above the chamber and catalyst within the chamber. By controlling the rate of fluidizing gas addition to the chamber, the rate of exchange of hot catalyst between the chamber and the bed is also controlled. Throttling back the flow of fluidizing gas to the chamber reduces the amount of heat transfer from the catalyst, thereby lowering the wall temperature of the cooling conduits for a constant circulation rate of cooling fluid. The cooling chamber is arranged such that a stagnant layer of catalyst surrounds the cooling coils when the flow of fluidizing gas is cut off. In this way, the cooling conduits can be maintained indefinitely within an operating regeneration zone without the circulation of cooling fluid. Such an operation is particularly advantageous during start-up when the regeneration zone is being heated to initiate the combustion of coke in the regeneration operation.
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McBride Thomas K.
Santiago Amalia
Tolomei John G.
UOP
Warden Robert J.
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