Method and apparatus for obtaining and securing optimum thrust o

Details Method and apparatus for obtaining and securing optimum thrust o Method and apparatus for obtaining and securing optimum thrust o

1978-03-16

1979-10-23

Lake, Roy

Metallurgical apparatus

Process

Tuyere operation

266266, 266270, C21B 716

Patent

active

041717988

ABSTRACT:
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 interference 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 parallel 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.

REFERENCES:
patent: 636239 (1899-11-01), Benni
patent: 3771473 (1973-11-01), Borgnat et al.

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