Patent ID: 9080813
Filing Date: 2015-07-14
Classification: F27B

Abstract:
1. A method of increasing interaction of solid material processed by and passing through a rotary kiln having a shell with gas inside the rotary kiln, wherein said material passes through the kiln from an inlet end to a discharge area at the opposite end of the kiln, said method including: (a) rotating the rotary kiln thereby causing the material to be transported by centrifugal force upwardly on said shell without the use of flights; and (b) rotating the rotary kiln for a period at a rotational speed that causes said material to spread out thereby increasing exposure of said material to said gas without the use of flights and (c) wherein the maximum rotational speed of said shell is just below the speed where the centrifugal force acting upon said material is equal to the gravitational force, and said rotational speed of said shell causes centrifugal forces acting upon said material to be greater than seventy percent of gravitational forces acting upon said material but less than one-hundred percent of gravitational forces acting upon said material, and causes 100% of said material to flow downwardly in freefall solely by virtue of gravity from said shell per revolution of the kiln, thereby to further enhance said interaction of material passing through the kiln with said gas inside the rotary kiln.