Device for injecting preheated air into a shaft furnace and process of manufacturing ball-and-socket joints
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United States of America Patent
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May 11, 1993
Grant Date -
N/A
app pub date -
Nov 8, 1991
filing date -
Nov 9, 1990
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Abstract
A device is presented for injecting preheated air into a shaft furnace and comprises of a plurality of tubular elements provided with a refractory lining, which are connected to each other by a ball-and-socket articulation and an expansion joint. The ball-and-socket articulations comprise a convex ball portion formed in the refractory material of the adjacent segment. They comprise a protective shell made of refractory steel which extends around the convex part up to the base of the ball portion. The radius of curvature of each ball-and-socket articulation is in the range of magnitude of half the diameter of the tubular elements.
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