F - Mech Eng,Light,Heat,Weapons – 27 – D
Patent
F - Mech Eng,Light,Heat,Weapons
27
D
39/96
F27D 3/16 (2006.01)
Patent
CA 1117757
ABSTRACT OF THE DISCLOSURE In a blast furnace tuyere, operating at subsonic velocity, an inner cylindrical air conduit is reduced to a frusto-conical conduit near the tuyere nose. A water cooled pear-shaped, hollow body within the tuyere is held suspended by a bracket, in a centered position, where it exerts minimum inter- ference with the pressurized fluid flowing partly through it and partly around it, having a cylindrical smaller conduit in such body and an annulus between the outer perimeter of such body and the inner wall of the cylindrical or conical conduit of the tuyere. The bracket slides parallel to the tuyere axis in guides, which are integral parts of the tuyere proper, thereby securing a centered position whenever the bracket is approaching to or retreating from the tuyere nose. The area of the annulus is uniformly decreasing when the body on the bracket is-moving toward the tuyere's nose; consequently, the air jet velocity through the tuyere is increased but by virtue of the diverging-converging inverse annular nozzle between the frusto-conical conduit and the pear-shaped suspended body, a near paralled air current with optimum thrust can be maintained at any position of the body. A driving mechanism serves to actuate the movement of the bracket and body; the driving mechanism being externally mounted at an accessible location.
315387
Borden Ladner Gervais Llp
Koppers Company Inc.
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