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US 4,720,262 AGranted
Apparatus for the heat treatment of fine material
AssigneeKrupp Polysius AG
InventorsManfred Durr, Karl Krutzner, Heinz-Werner Thiemeyer, Jurgen Wurr, Peter Tiggesbaumker, Wolfgang Rother
Life of this patent
Estimating the term…
Abstract
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.
Claims13
In apparatus for the heat treatment of fine material having:
- (a) a kiln;
- (b) a preheater;
- (c) a calciner having a longitudinal axis joining the kiln and the preheater and forming a combustion zone for the precalcination of the preheated fine materials;
- (d) air pipe means communicating with the calciner for supplying tertiary air thereto;
- and
- (e) material supply pipe means communicating with said air pipe means at a point upstream from said calciner for mixing said material and tertiary air;
- the improvement comprising:
- (f) means restricting the internal cross sectional area of said air pipe means at its juncture with said calciner for accelerating the speed at which mixed material and tertiary air are delivered into said calciner, thereby increasing turbulence within said calciner said restricting means comprising a wedge which increasingly reduces the cross sectional area of the pipe means in the direction of flow of the tertiary air, the narrowest cross sectional area being located at the juncture of the air pipe and the calciner.
5 more elements
In apparatus for the heat treatment of fine material having:
- (a) a kiln;
- (b) a preheater;
- (c) a calciner having a longitudinal axis joining the kiln and the preheater and forming a combustion zone for the precalcination of the preheated fine materials;
- (d) a pair of air pipe means each of which communicates with the calciner for supplying teritary air thereto;
- and
- (e) material supply pipe means communicating with each of said air pipe means at a point upstream from said calciner for mixing said material and tertiary air;
- the improvement comprising:
- (f) means restricting the internal cross sectional area of each of said air pipe means at its juncture with said calciner for accelerating the speed at which mixed material and tertiary air are delivered into said calciner, thereby increasing turbulence within said calciner, said restricting means comprising a wedge which increasingly reduces the cross sectional area of the pipe means in the direction of flow of the tertiary air, the narrowest cross sectional area being located at the juncture of the air pipe means and the calciner.
5 more elements
In apparatus for the heat treatment of fine material having:
- (a) a kiln;
- (b) a preheater;
- (c) a calciner having a longitudinal axis joining the kiln and the preheater and forming a combustion zone of the precalciantion of the preheated fine materials;
- (d) air pipe means communicating with the calciner for supplying teritary air thereto;
- and
- (e) material supply pipe means communicating with said air pipe means at a point upstream from said calciner for mixing said material and tertiary air;
- the improvement comprising:
- (f) means restricting the internal cross sectional area of said air pipe means its juncture with said calciner for accelerating the speed at which mixed material and tertiary air are delivered into said calciner, thereby increasing turbulence within said calciner, said restricting means comprising an adjustable slide.
5 more elements
In apparatus for the heat treatment of fine material having:
- (a) a kiln;
- (b) preheater;
- (c) a claciner having a longitudinal axis joining the kiln and the preheater and forming a combustion zone for the precalcination of the preheated fine materials;
- (d) a pair of air pipe means each of which communicates with the claciner for supplying tertiary air thereto;
- and
- (e) material supply pipe means communicating with each of said air pipe means at a point upstream form said calciner for mixing said material and tertiary air;
- the improvement comprising:
- (f) means restricting the internal cross sectional area of each of said air pipe means at its juncture with said claciner for accelerating the speed at which mixed material and tertiary air are delivered into said calciner, thereby increasing tubulence within said calciner, said restricting means comprising an adjustable slide.
5 more elements
Dependencies are inferred from the claim text.