Krupp Polysius Ag

Polysius Ag

Horst Kretzer

Wilfried Kreft

Horst Ritzmann

Wolf Goldmann

Heinz-Werner Thiemeyer

Georg Schepers

Frank Schaberg

Klaus Bauer

Heinrich Weber

Rudolf Weber

Rudiger Beyer

Herbert Schmelter

Erich Schnieder

The invention relates to a method and apparatus for the heat treatment of fine-grained material wherein a precalcination zone formed by the kiln exhaust gas duct of a rotary kiln and into which two branch streams of cooling air which have been subjected to opposing rotational flow are introduced. In this way an equalization of the speed profile over the cross-section of the kiln exhaust gas duct and an improvement in the burning up of the fuel is achieved.

Method and apparatus for the heat treatment of fine-grained material

A process for producing cement wherein preheated, partially calcined powder-form raw material is finally calcined in a fluidized bed and is discharged to a cooler through which a cooling stream of air passes. A part of the cooling air passes into the fluidized bed from below and another part of the cooling air, together with the partially calcined material, passes into the fluidized bed from the side. The rates of material flow to and from the fluidized bed is regulated to maintain a substantially uniform intersticial ratio between the upper and lower regions of the fluidized bed.

Process for the production of cement in a fluidized bed

Growing community of inventors

Beckum, Germany

Horst Kretzer