Tuyere for installation in hearth of electric arc furnace

Details Tuyere for installation in hearth of electric arc furnace Tuyere for installation in hearth of electric arc furnace

1992-12-07

1994-07-12

Reynolds, Bruce A.

Industrial electric heating furnaces

Arc furnace device

Furnace body detail

373 22, 266265, F27D 100, C21B 716

Patent

active

053295455

ABSTRACT:
Molten metal in an electric arc furnace is stirred by introducing a gas into the melt through tuyeres mounted in the hearth. Each tuyere has an inlet portion having a passage of relatively large diameter and an outlet portion having a passage of relatively small diameter. The tuyere is mounted in the bottom of the electric arc furnace with the inlet portion extending through the furnace shell and part of the refractory brickwork. With this design of tuyere gas at conveniently available pressure (16 bar A) can be fed to the tuyere and leaves the outlet portion at least at sonic velocity thus forming a relatively stable jet which inhibits molten metal entering the tuyere. The outlet portion may have a first portion with a slightly larger internal diameter than a second portion downstream of the first portion. When the second portion is fully eroded the flow of gas increases and triggers an alarm. However, the internal diameter of the first portion is still at least sonic to inhibit the ingress of molten metal into the tuyere.

REFERENCES:
patent: 3703279 (1972-11-01), Saccomano et al.
patent: 3802684 (1974-04-01), Rote
patent: 4022447 (1977-05-01), Griffiths
patent: 4266970 (1981-05-01), Iwaoka et al.
patent: 4417723 (1983-11-01), Kitamura et al.
patent: 4795138 (1989-01-01), Fuhrhop et al.

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