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A method and apparatus for cooling hot FCC catalyst particles in a heat exchange zone that is separate and distinct from the regenerator having an upper portion that operates in a flow-through mode and a lower part that operates in a back mix mode. Catalyst descends from a collection zone into an up

A method and apparatus for cooling hot FCC catalyst particles in a heat exchange zone that is separate and distinct from the regenerator having an upper portion that operates in a flow-through mode and a lower part that operates in a back mix mode. Catalyst descends from a collection zone into an upper inlet of a heater exchanger. The exchanger contains a series of tubes for indirect heat exchange of the catalyst with a cooling fluid. Catalyst leaves the exchanger through an outlet located at a mid portion of the exchanger. The section of the exchanger between the inlet and outlet comprises the flow-through portion. Catalyst undergoes further heat exchange below the outlet of the exchanger in the backmix portion. Fluidizing gas that enters at the bottom of the exchanger provides the necessary turbulence for particle interchange in the backmix section of the heat exchange zone as well as transport of the particulate material through the flow-through portion of the exchanger. The method and exchanger design facilitates the addition of surface area to the exchanger and increases the heat removal duty in the backmix section of the exchanger.

대표청구항 ▼

An apparatus for cooling hot fluidized catalyst particles from an FCC regenerator and returning cooled catalyst particles to the FCC regenerator, said apparatus comprising: (a) a vertically-oriented elongated heat exchanger having upper and lower heat removal sections for indirectly contacting said

An apparatus for cooling hot fluidized catalyst particles from an FCC regenerator and returning cooled catalyst particles to the FCC regenerator, said apparatus comprising: (a) a vertically-oriented elongated heat exchanger having upper and lower heat removal sections for indirectly contacting said particles with a cooling fluid; (b) a plurality of heat exchange tubes having a substantial surface area in each of said sections wherein said surface area in said lower heat removal section is at least equal to 25% of the surface are in said upper heat removal section; (c) a particle inlet located at an upper end of said upper section for admitting hot particles and a particle outlet located in a mid portion of said heat exchanger for withdrawing cool particles from said exchanger; and, (d) means for adding fluidizing gas to the bottom of said lower heat removal section.