Kiln lining and method
AssigneeChemical Lime Company
InventorWilliam H. Schoof
Life of this patent
Estimating the term…
Abstract
A rotary reactor is shown having an improved internal lining including a lifter section which extends along an interior surface of the reactor chamber for lifting material from a lower portion of the chamber to an upper portion thereof as the chamber rotates. The lifter section is formed as a monolithic casting of a refractory material having a polygonal cross-section which includes a series of blunt faces alternating with a series of slanted faces. The slanted faces are aligned with a direction of rotation of the reactor such that the slanted faces of the refractory material first contact the material being lifted.
Claims14
In a rotary reactor having a substantially cylindrical, horizontally-oriented, elongate chamber for burning materials therein, the chamber having an interior surface and having means for rotating the chamber, the improvement comprising:
- a plurality of lifter sections extending along the interior surface of the chamber for lifting material from a lower portion of the chamber to an upper portion thereof as the chamber rotates and for gradually dumping the material being lifted thereby from the upper portion of the chamber, each lifter section being formed as a monolithic casting of a refractory material having a polygonal cross section including a series of blunt faces alternating with a series of slanted faces, and wherein the slanted faces are aligned with a direction of rotation of the reactor such that the lifter sections only undergo compression from the material being lifted during rotation of the chamber with the slanted faces of the refractory material first contacting the material being lifted;
- and wherein
- the means for rotating the chamber rotates the chamber in said given direction.
In a rotary kiln having a horizontally oriented, metal shell with an interior with a horizontal axis and having an exposed interior surface over which a load travels during operation of the kiln, the improvement comprising:
- a plurality of lifter sections extending along the interior surface of the chamber for lifting a load from a lower portion of the chamber to an upper portion thereof as the chamber rotates and for gradually dumping the load being lifted thereby from the upper portion of the chamber, each lifter section being formed as a monolithic casting of a refractory material having a polygonal cross section including a series of blunt faces alternating with a series of slanted faces, and wherein the slanted faces are aligned with a direction of rotation of the kiln such that the slanted faces of the refractory material first contact the load being lifted;
- and
- wherein each lifter section slanted face comprises a leading face and each lifter section blunt face comprises a trailing face, the trailing faces of each lifter section converging at a greater angle to a radius of the interior surface of the kiln than the leading faces so that the leading faces slice into the load being lifted and the lifter sections only undergo compression from the load being lifted during rotation of the chamber;
- and further comprising
- means for rotating the kiln in said direction of rotation.
In a rotary lime kiln having a substantially cylindrical, horizontally-oriented, elongate chamber for calcining limestone therein, the chamber having a longitudinal axis and an interior surface and having means for rotating the chamber, the improvement comprising:
- a plurality of lifter sections extending along the interior surface of the chamber for lifting limestone from a lower portion of the chamber to an upper portion thereof as the chamber rotates and for gradually dumping the limestone being lifted thereby from the upper portion of the chamber, each lifter section being formed as a monolithic casting of a refractory material having a polygonal cross section including a series of blunt faces alternating with a series of slanted faces, and wherein the slanted faces are aligned with a direction of rotation of the kiln such that the lifter sections only undergo compression from the limestone being lifted during rotation of the chamber with the slanted faces of the refractory material first contacting the limestone being lifted;
- and wherein
- the means for rotating the chamber rotates the chamber in said given direction of rotation.
A method of calcining limestone within a rotary lime kiln having a substantially cylindrical, horizontally-oriented, elongate chamber, the chamber having a longitudinal axis and an interior surface and having means for rotating the chamber, the method comprising the steps of:
- casting a refractory material in the form of at least one lifting section which extends along the interior surface of the chamber for lifting limestone being calcined from a lower portion of the chamber to an upper portion thereof as the chamber rotates, gradually dumping the limestone being lifted thereby from the upper portion of the chamber;
- providing the refractory material with a polygonal cross section including a series of blunt faces alternating with a series of slanted faces, the slanted faces being oriented at a selected angle to a radius of the interior surface;
- and
- rotating the kiln in a given direction of rotation, the direction of rotation being such that the slanted faces of the refractory material first contact the limestone being lifted and calcined within the kiln, and wherein the selected angle is such that the at least one lifting section only undergoes compression during rotation of the kiln.
Dependencies are inferred from the claim text.