Method for regulating a roasting furnace
AssigneeOutokumpu Oyj
InventorHeikki Siirilä
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Abstract
The invention relates to a method of regulating a roasting furnace in fluidized bed roasting. Part of the roasting furnace grate is separated off into a separate grate section, known as the overflow grate, where the nozzles and the amount of roasting gas blown through them can be regulated independently of the main grate. It is advantageous to position the separately regulated grate in the section of the furnace where the overflow aperture is located.
Claims14
A method for regulating roasting furnace conditions in a roasting furnace having a fluidized bed in which a material for roasting is calcined, comprising feeding the material for roasting into the furnace at a location above the fluidized bed, feeding a fluidizing roasting gas through nozzles within a main grate located at the bottom of the furnace to fluidize the material for roasting, removing from the furnace at least some of the calcined material through an overflow aperture located at the top of the fluidized bed, separating off part of the roasting furnace main grate, within the same section of the furnace that the overflow aperture is located and below the overflow aperture, to form a separate section, an overflow grate, and feeding fluidizing roasting gas through nozzles within the overflow grate at a rate that is independent of the rate that fluidizing roasting gas is fed though the nozzles within the main grate.
Dependencies are inferred from the claim text.