System and method for calcining gypsum
AssigneeALSTOM Technology Ltd
InventorMichael M. Chen
Life of this patent
Estimating the term…
Abstract
A system (100) for calcining natural gypsum, synthetic gypsum (112) or a combination thereof, the system including: a mill (114) for grinding and drying natural gypsum, synthetic gypsum (112) or a combination thereof, to produce dried gypsum (116); a flash calciner (118) for calcining the dried gypsum to produce an exhaust gas (130) and calcined gypsum (128); and a mechanism (134) for transporting at least a portion of the exhaust gas (130) produced by the flash calciner (118) to an air heater (126) that supplies hot gas (126a) to the flash calciner (118).
Claims15
A system for calcining natural gypsum, synthetic gypsum or a combination thereof, the system comprising:
- a mill for grinding and drying natural gypsum, synthetic gypsum or a combination thereof, to produce dried gypsum;
- a flash calciner for calcining the dried gypsum to produce an exhaust gas and calcined gypsum;
- and
- a mechanism for transporting at least a portion of the exhaust gas produced by the flash calciner to a first air heater that supplies hot gas to the flash calciner and to the mill.
A process for calcining natural gypsum, synthetic gypsum or a combination thereof, the process comprising:
- supplying natural gypsum, synthetic gypsum or a combination thereof to a mill;
- grinding and drying the natural gypsum, synthetic gypsum or a combination thereof in the mill to form dried gypsum and a first exhaust gas;
- supplying the dried gypsum to a flash calciner;
- calcining the dried gypsum in the flash calciner, thereby producing a second exhaust gas and calcined gypsum;
- and
- transporting at least a portion of the second exhaust gas to a first air heater that provides hot gas to the flash calciner and to the mill.
A system for calcining gypsum, the system comprising:
- a mill for grinding and drying gypsum, thereby producing dried gypsum and a first exhaust gas, wherein the mill is selected from a roller mill or a hammer impact mill, and further wherein the gypsum is selected from natural gypsum, synthetic gypsum or a combination thereof;
- a flash calciner for calcining the dried gypsum, thereby producing calcined gypsum and a second exhaust gas;
- and
- a mechanism for transporting the second exhaust gas produced by the flash calciner to a first air heater coupled to the flash calciner and to the mill.
Dependencies are inferred from the claim text.