Method and apparatus for promoting biaxially uniform particle size distribution in an airstream containing coal particles of mixed sizes
OwnerRickey E. Warkinventor
Life of this patent
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Abstract
An apparatus for promoting biaxially uniform distribution of coal particle size in an airstream supplying combustible mixture to a firebox by way of a header having a quadrangular arrangement of feed pipes. A conduit or duct which receives the coal air mix from a bowl mill pulverizer uses first and second single axis mixer elements in series, the operating or mixing axes of the two elements being disposed orthogonal to one another and at right angles to the air flow direction in the vicinity of the mixer elements. Deflector bars are disposed immediately upstream of the mixer elements.
Claims12
Apparatus for promoting biaxially uniform particle size distribution in an airstream containing particles of mixed sizes comprising:
- an air-flow duct having an inlet and an outlet and defining an air-flow direction;
- a first mixer element disposed in the duct at a first location between the inlet and outlet for mixing particles which are size distributed along a first axis extending across the air-flow;
- and
- a second mixer element disposed in the duct at a second location downstream of the first mixer element for mixing particles which are size distributed along a second axis extending across the air-flow direction;
- the first cross-axis being orthogonal to the second cross-axis whereby the particle size distribution at the outlet is more uniform than the particle size distribution at the inlet of the duct.
A method of promoting biaxially uniform particle size distribution in a coal particle/air stream wherein the coal particles are of mixed sizes comprising the steps of:
- a. causing the coal particle/air mix to enter a duct;
- b. mixing the particle sizes across a first axis extending across the air flow direction;
- c. thereafter mixing the particle/airstream across a second axis extending across the air-flow direction wherein the second cross-axis is orthogonal to the first cross-axis;
- and
- d. thereafter directing the twice-mixed coal particle/air mixture to a combustion chamber.
Dependencies are inferred from the claim text.