Method and grate cooler for hot bulk material
AssigneeKrupp Polysius AG
InventorsDetlev Kupper, Gerhard Kastingschafer, Ludger Brentrup
Life of this patent
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Abstract
The invention relates to the cooling of hot bulk material, particularly cement clinker, ore material or the like, in a grate cooler, in which the bulk material is transported on the cooler grate surface toward an outlet and exposed to cooling gas from below. At least a part of the relatively cooler lower portion of the material layer is discharged through suitable chutes upstream of the cooler outlet while in transport to increase the cooling efficiency of the process.
Claims24
A method of cooling hot bulk material comprising delivering the hot material to a conveyor inlet to form a layer of said material of said conveyor;
- transporting said layer via said conveyor toward a primary outlet;
- passing a stream of cooling gas through said layer via openings in said conveyor and in a direction from one side of said layer to the other to establish in said layer a temperature gradient having its lowest value at said one side of said layer;
- reducing the thickness of said layer by diverting a portion of the material from said one side of said layer at least at one zone separate from and independent of said openings in said conveyor and located between said inlet and said primary outlet;
- accumulating the material diverted from said layer;
- adjusting the quantity of material diverted from the layer in inverse proportion to the quantity of accumulated material;
- and discharging the remainder of the material through said primary outlet.
A method of cooling hot bulk material comprising introducing said material to a conveyor via an inlet to form a layer of said material on said conveyor;
- transporting said material via said conveyor in a direction toward a primary outlet downstream of said inlet;
- cooling said material from below throughout its movement toward said primary outlet by passing a stream of cooling gas through openings in said conveyor and upwardly through said material, thereby producing in said material a temperature gradient having a relatively cooler bottom layer portion and a relatively hotter upper layer portion overlying said bottom layer portion;
- reducing the thickness of said layer by diverting a quantity of said relatively cooler bottom layer portion of said material from said conveyor at a zone downstream of said inlet and upstream of said primary outlet, said zone being separate from and independent of said openings;
- accumulating the diverted material;
- and adjusting the quantity of material diverted from said conveyor at said zone in inverse proportion to the quantity of the material collected.
Grate cooler apparatus for cooling hot bulk material comprising a conveyor having a material-supporting surface for transporting hot bulk material in a layer from an inlet at one end of said conveyor toward a primary outlet at its opposite end;
- a plurality of cooling gas openings extending along the length of said conveyor and underlying said supporting surface;
- means for directing cooling gas upwardly through said openings and through said layer of material as it is transported by said conveyor to establish in said layer a temperature gradient having its lowest temperature adjacent said supporting surface;
- at least one intermediate material outlet underlying and in communication with said supporting surface between said inlet and said primary outlet and separate from and independent of said cooling gas openings for enabling the diversion of a portion of said material through said intermediate outlet thereby reducing the thickness of said layer;
- means for accumulating the material discharged through said intermediate outlet;
- and adjustable means for discharging variable quantities of said accumulated material, the quantity of material diverted from said layer through said intermediate outlet being inversely proportional to the quantity of the accumulated material.
Dependencies are inferred from the claim text.