Apparatus for calcining gypsum
OwnerSidney M. Coheninventor
Life of this patent
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Abstract
An apparatus and process for calcining gypsum is disclosed which utilizes a flash furnace for rapidly calcining fine particulate gypsum while the material is suspended in a stream of hot gas. The method and apparatus utilize a two-stage suspension preheater for utilizing waste gases from the calcining furnace for preheating raw material to be calcined and a two-stage suspension cooler for cooling hot calcined gypsum which is discharged from the calcining furnace. Spent cooling gas is supplied to the preheater for use in preheating the fresh gypsum to be calcined. The invention also contemplates recirculating a portion of the gypsum discharged from the furnace back to the furnace for further calcination. Hot product may be discharged directly from the furnace.
Claims9
Apparatus for calcining gypsum comprising:
- a preheater for preheating fresh gypsum to be calcined including an inlet for hot preheating gas, an inlet for fresh gypsum to be calcined and an outlet for preheated gypsum;
- furnace means including an inlet for preheated gypsum flow connected to the outlet for preheated gypsum of the preheater, means for producing hot gas for at least partially calcining the gypsum, an outlet for hot at least partially calcined gypsum, and an outlet for hot gas flow connected to the inlet for hot preheating gas of the preheater;
- a cooler for cooling calcined gypsum including an inlet for hot at least partially calcined gypsum flow connected to the outlet for at least partially calcined gypsum of the furnance means, an inlet for cooling gas whereby heat exchange contact between the hot calcined gypsum and the cooling gas occurs within the cooler, the hot calcined gypsum is cooled and the cooling gas is heated, an outlet for cooled calcined gypsum and an outlet for heated cooling gas flow connected to the inlet for hot preheating gas of the preheater.
Apparatus for calcining solid particulate material comprising:
- a preheater for preheating fresh particulate material to be calcined including an inlet for hot preheating gas, an inlet for fresh particulate material to be calcined and an outlet for preheated material;
- furnace means including an inlet for preheated particulate material flow connected to the outlet for preheated material of the preheater, means for producing hot gas for at least partially calcining the particulate material, an outlet for hot at least partially calcined particulate material, and an outlet for hot gas flow connected to the inlet for hot preheating gas of the preheater;
- a cooler for cooling calcined particulate material including an inlet for hot at least partially calcined particulate material flow connected to the outlet for at least partially calcined particulate material of the furnace means, an inlet for cooling gas whereby heat exchange contact between the hot calcined particulate material and the cooling gas occurs within the cooler, the hot calcined particulate material is cooled and the cooling gas is heated, an outlet for cooled calcined particulate material and an outlet for heated cooling gas flow connected to the inlet for hot preheating gas of the preheater.
Dependencies are inferred from the claim text.