Method and apparatus for calcination

Details Method and apparatus for calcination Method and apparatus for calcination

1989-02-07

1990-04-24

Yuen, Henry C.

Heating

With heating gas conveying, agitating, scattering or...

110245, 422142, F27B 1500, B01J 818

Patent

active

049196138

ABSTRACT:
In a method and apparatus for the heat treatment of gypsum or like heat material, in which the material is heated in a vessel by indirect heat exchange with hot gas produced by the fluidized combustion of a fuel, material is fed into a first fluidized bed of the material. Partially treated material is removed from the lower region of the first bed and introduced with the assistance of compressed air into the upper region of a second fluidized bed. Treated material is removed from the second bed. The beds of material are both fluidized by means of the introduction of the hot gas product of the fluidized combustion bed, further heating the beds. The first bed may be operated at a lower temperature than the second bed, although both beds may receive substantially the same heat input.

REFERENCES:
patent: 4247518 (1981-01-01), Charlet et al.
patent: 4338283 (1982-07-01), Sakamoto et al.
patent: 4455285 (1984-06-01), Watkins et al.
patent: 4517162 (1985-05-01), Moss
patent: 4615867 (1986-10-01), Heckmann

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