Method and apparatus for varying the velocity of blast air...

C - Chemistry – Metallurgy – 21 – B

Patent

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39/64, 39/96

C21B 7/16 (2006.01)

Patent

CA 1102118

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 hollow body within the tuyere is held suspended by a bracket, preferably in a centered position, where it exerts minimum interference with the air flowing partly through it and partly around it, having a cylindrical smaller conduit in such body and an annulus between the outer perimiter 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, approaching to or retreating from the tuyere nose. The area of the annulus is decreasing when the body on the bracket is moving toward the tuyere's nose; consequently the air jet velocity through the tuyere is increased. More than one body may be applied within the tuyere to achieve the same effect. A driving mechanism serves to actuate the movement of the bracket and body; the driving mechanism being externally mounted at an accessible location.

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