Process and apparatus for calcining solids or sludges
AssigneesPolysius AG, Maerz Ofenbau AG
InventorsChristoph Beyer, Walter Egger
Life of this patent
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Abstract
The invention relates to a process and an apparatus for calcining solids or sludges in a multiple-deck furnace having a firing region, which has at least one upper heated hearth and at least one lower heated hearth, and having a cooling region, which is provided with one or more unheated hearths, material to be calcined passing first into the firing region and then into the cooling region. A portion of the material to be calcined is delivered to the at least one lower heated hearth and/or to the cooling region, bypassing the at least one upper heated hearth of the firing region.
Claims16
A process for calcining solids or sludges in a multiple-deck furnace having a firing region, which has at least one upper heated hearth and at least one lower heated hearth, and having a cooling region, which is provided with one or more unheated hearths, said process comprising the step of:
- passing a main portion of a material to be calcined into the firing region and then into the cooling region, and
- delivering a bypass portion of the material to be calcined to at least one of the lower heated hearth or the cooling region, bypassing the at least one upper heated hearth of the firing region, wherein the at least one of the lower heated hearth or the cooling region has the main portion of the material already present therein at a temperature of at least 400° C.
An apparatus for calcining solids or sludges comprising:
- a multiple-deck furnace having
- a firing region, which has at least one upper heated hearth and at least one lower heated hearth, and
- a cooling region, which is provided with one or more unheated hearths, and
- a delivery means for delivering a main portion of a material to be calcined to the firing region, and
- a bypass delivery means for delivering a bypass portion of the material to be calcined to at least one of the lower heated hearth or the cooling region, bypassing the at least one upper heated hearth of the firing region, wherein the at least one of the lower heated hearth or the cooling region has the main portion of the material already present therein heated to a temperature of at least 400° C.
Dependencies are inferred from the claim text.