Krupp Polysius Ag

Polysius Ag

Karl Krutzner

Wolfgang Rother

Manfred J Durr

Jurgen Wurr

Georg Unland

Peter Tiggesbaumker

Gunter Driemeier

Otto Heinemann

Heinz-Herbert Schmits

Heinz-Werner Thiemeyer

Karl Josef Menzel

Michael Von Seebach

Frank Schaberg

Heinrich Klockenbusch

Pedro G Palma

Dieter Dreyer

An inlet for a rotary kiln comprises a plurality of arcuate segments supported adjacent the inlet opening of the kiln to form a trough protruding through the inlet opening. Each of the segments is hollow and has an opening through which a cooling medium may be introduced.

Rotary kiln inlet

The invention relates to apparatus and to a method for the heat treatment of fine-grained material using a multi-stage cyclone preheater and a combustion chamber supplied with tertiary air from the cooler, in which the branched part of the tertiary air pipe extends upwards and the material discharged from the second-lowest stage of the cyclone preheater is introduced into one branch pipe at a point which lies lower than the point at which this branch pipe is connected to the combustion chamber. In this way good dispersal of the material which is delivered pneumatically to the combusion chamber and excellent combustion conditions are achieved at the same time as a considerable reduction in the overall height of the entire cyclone preheater.

Apparatus and method for the heat treatment of fine-grained material

The heat treatment of fine-grained material wherein two quantities of fuel are delivered to a precalcination zone at two different levels. The first quantity of fuel is delivered at a lower level nearer the combustion zone and the oxygen content of the gases passing through this region of the precalcination zone are such that in this region a substoichiometric combustion takes place and a CO content between 0.05% and 1% is established. As a result a reducing decomposition of the NO.sub.x content of the exhaust gases from the combustion zone takes place.

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

Apparatus for the heat treatment of fine material comprises a multi-stage cyclone preheater, a rotary kiln and a calciner supplied with tertiary air from a cooler for precalcination of the preheated fine material. The tertiary air pipe is narrowed at the point where it joins into the calciner. In this way an intensification of the mixing together of material, fuel and gas is achieved as well as an improved combustion, particularly fuels which are slow to react.

Apparatus for the heat treatment of fine material

Apparatus for heat treatment of fine-grained material has a multi-stage cyclone preheater, a rotary kiln, and a gas pipe extending between the kiln and the preheater and forming a calcination zone for precalcining materials entrained in the gas stream. The gas pipe has an upwardly extending pipe section that communicates with an arcuate deflector section and a downward pipe section which extends downwards to and communicates with the lowest cyclone stage. The downwardly extending pipe section of the gas pipe has an extension constructed as a coarse separator so that relatively coarse material particles contained in the mixed gas-material stream are kept away from the lowest cyclone stage of the preheater.

Apparatus for heat treatment of fine-grained material

A rotary tubular kiln and a preheater for material supplied to the kiln are connected by a duct leading from one end of the kiln, for conducting waste gases from the kiln to the preheater. A bypass conduit is connected to said duct for diverting part of said waste gases and extends from the duct in such a direction as to divert a stream of waste gases at an angle of at least 90.degree. to the stream of gases flowing through the duct. An upright mixing chamber is connected at its bottom to said bypass conduit to cause said diverted stream of gases to flow upward through said mixing chamber. The mixing chamber has in its lower portion at least one lateral inlet for introducing cooling air into said diverted stream of gases, and the distance between the axis of said duct and a point on the axis of said mixing chamber at the level of said inlet is from 1.5 to 3 times the square root of the quotient of the cross-sectional area of the duct divided by pi.

Apparatus for heat treating fine-grain solids

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Beckum, Germany

Karl Krutzner