Fluidized bed reactor with vertical cooling coils

Details Fluidized bed reactor with vertical cooling coils Fluidized bed reactor with vertical cooling coils

B - Operations, Transporting

01

J

23/421, 39/46

B01J 8/24 (2006.01) B01J 8/18 (2006.01) F22B 31/00 (2006.01) F27B 15/16 (2006.01)

Patent

CA 1154960

ABSTRACT OF THE DISCLOSURE A fluidized bed reactor is provided with heat exchange coils for controlling the temperature of the fluidized bed, with only vertically oriented sections of the coils exposed to the erosive conditions in the fluidized bed. The vapor-liquid circuit, of which the heat exchanger coils are a part, is arranged to operate on the principle of natural circulation. At least some of the tuyere elements discharge fluidizing gas at a level substantially above the constriction plate and the bed solids below the level of the tuyere gas dis- charge constitute a static layer during fluidization in which the lower angle bends of the heat exchange coil are embedded and so shielded from erosion by the fluidized solids of the bed proper. The static layer of bed solids also accommodates thermal expansion of the lower angle bend due to elevated temperatures and insulates the constriction plate from the high temper- atures in the reactor. The upper angle bends of the heat exchange coils are located above the fluidized solids of the bed in the freeboard of the reactor. plurality of the heat exchange coils may be fixed in removable hatches or panels provided in the wall of the reactor so that the heat exchange coils may be readily withdrawn from the reactor for maintenance purposes.

386417

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