Fluidized bed reactor

Details Fluidized bed reactor Fluidized bed reactor

B - Operations, Transporting

01

J

B01J 8/32 (2006.01) F23C 11/02 (1990.01)

Patent

CA 2093572

ABSTRACT OF THE DISCLOSURE Common problems in fluidized bed reactors include uneven distribution of particulate material in the bed, poor contact between fuel and fluidized bed particles, and difficulties in separating solids from flue gases. These problems are solved in a fluidized bed reactor including a rectangular cross section, elongated housing containing a large area, lower reactor chamber and a smaller area, freeboard, fluidizing air being fed into the bottom of the reactor chamber via a plurality of nozzles in parallel inlet pipes, the nozzles being inclined slightly outwardly towards opposite sides of the housing; a bottom central solids discharge pipe for recycling a portion of the solids to a fuel/sorbent inlet in one side of the housing above the fluidized bed; a flow divider near the top of the fluidized bed when activated for diverting particles outwardly in a spiral motion towards the sides of the bed; shelves in the freeboard for causing the flue gas to follow a circuitous route through the freeboard, causing the settling of entrained solids; water pipes lining the housing and extending between bottom and top boilers for creating steam; separators for receiving flue gas to remove solids therefrom for recycle to the fluidized bed; and a heat exchanger for preheating fluidizing/combustion air before introducing such air into the fluidized bed.

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