During recent residue fluidized catalytic cracking
(RFCC) projects, a new heat recovery configuration was
developed to minimize capital investment cost (Fig. 1). A
separate CO incinerator replaces the CO boiler combustion
chamber in the traditional scheme. The CO-free flue gas from
the incinerator then joins with R2 flue gas to the box-type
flue gas cooler. Actually, it is a heat recovery boiler that
consists of a superheater, evaporator and economizer. Cold
flue gas leaves the economizer and goes to the stack via an
electrostatic precipitator (ESP) as in a conventional design.
A DeSOx unit may be added to remove sulfur ox
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