Method and Device for heat-treating plaster
AssigneeCT Umwelttechnik AG
InventorsClaudia Langfeldt, Paul Bernhard Kroehl
Life of this patent
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Abstract
Disclosed is a method and device for heat-treating plaster which is calcined to form hemihydrate plaster or anhydrite. Calcining to form hemihydrate plaster is carried out in at least one fluid bed region in which the water vapor partial pressure and material temperature are adjusted. The at least one fluid bed region can be followed by a further fluid bed region in which the anhydrite is formed and the water vapor partial pressure and material temperature are also adjusted. In addition, a fluid bed region can be provided for cooling purposes before the product-discharge point.
Claims14
Apparatus for the thermal treatment of gypsum in a fluidized bed comprising a material inlet and a product outlet, with a plurality of separating weirs built into the fluidized bed which divide up the fluidized bed into a plurality of chambers arranged in series and which are provided with openings for the flow of material from one chamber into the next chamber, heat exchangers arranged in the fluidized bed in each chamber, which separate the heating medium and the material from one another, and supply means for a fluidizing gas in each chamber, wherein each chamber is equipped with supply means for water vapor, a temperature sensor and a measurement apparatus for the partial pressure of the water vapor;
- and including regulating circuits for the regulation of the temperature of the heat exchangers and/or of the fluidizing gas for the respective chamber and also for the supply of water vapor to the respective chamber in dependence on measured values.
Apparatus for the thermal treatment of gypsum in a fluidized bed comprising a material inlet and a product outlet, a plurality of separating weirs built into the fluidized bed which divide up the fluidized bed into a plurality of chambers arranged in series and which are provided with openings for the flow of material from one chamber into the next chamber, heat exchangers arranged in the fluidized bed in each chamber, which separate the heating medium and the material from one another, and supply means for a fluidizing gas in each chamber, wherein each chamber is equipped with supply means for water vapor and a temperature sensor;
- and including regulating circuits for the regulation of the temperature of the heat exchangers and/or of the fluidizing gas for the respective chamber in dependence on measured values and for the regulation of the supply of water vapor to the respective chamber in dependence on a partial pressure of the water vapor calculated from the moisture and quantity of the starting material and also from the quantity of the supplied fluidizing gas.
Dependencies are inferred from the claim text.