US 6,672,256 B2Granted

Preformed modular trefoil and installation method

AssigneeThe J. E. Baker Company

InventorsRonald J. Marr, Larry E. Shultz

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Abstract

A trefoil for a rotary kiln is provided that has at least three spoke-like refractory legs. Each one of the legs extends radially outwardly from a center of the trefoil; spans approximately from the kiln shell to the center of the kiln; is pre-formed outside of the kiln for installation as a single-leg unit; and has a mating surface that preferably is uniform and even, thereby lacking interlocking features. The mating surfaces of the legs abut one another at the kiln center to provide mutual support. An alignment member, such as a pair of longitudinal angles, are welded to the kiln shell to position the legs. A corresponding method of installing the trefoil is disclosed that includes positioning and shimming the first two legs at the 4 o'clock position and 8 o'clock position, and installing the third leg at the 12 o'clock position.

Claims7

Dependent claims

A heat exchanger for use within a rotary kiln that includes a cylindrical steel shell with an internal refractory lining, said heat exchanger comprising a first, preformed configuration and a second, installed configuration,

said heat exchanger, in the first, preformed configuration, comprising at least three loose, refractory legs, each one of the legs comprising:
a foot,
a mating end opposing the foot, and
a body extending between the foot and the mating end, each one of the legs is continuous and between the foot and the mating surface, thereby forming a single-leg unit, and
said heat exchanger, in the second, installed configuration that is formed within the kiln from the loose legs, having each one of the continuous, single-leg units assembled into a spoke-like configuration wherein each one of the legs extends substantially radially outwardly from a center thereof to proximate the shell, and metallic retainers coupling the mating ends of the leg to the shell.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/873,514Filed 5 Jun 2001 · continuation
Priority: 8 Feb 2000
Published: US 2001/0026912 A14 Oct 2001
Granted: 6 Jan 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F27D 1/04
Casings; Linings; Walls; Roofs: characterised by the form , e.g. shape of the bricks or blocks used
F27B 7/167
The means being fixed relatively to the drum, e.g. composite means: the means comprising partitions
F27B 7/28
Details, accessories or equipment specially adapted for rotary-drum furnaces: arrangements of linings
F27D
Details or accessories of furnaces, kilns, ovens or retorts, in so far