Process for melting a charge in a furnace

Details Process for melting a charge in a furnace Process for melting a charge in a furnace

1995-11-09

1998-10-13

Hoang, Tu B.

Industrial electric heating furnaces

Arc furnace device

Furnace body detail

373 2, 373 85, 266 47, 75530, F27D 100

Patent

active

058223576

ABSTRACT:
A charge of scrap is melted in a furnace (1) with post-combustion of the fumes by injection of an oxygenated gas into the space in the furnace above the charge. During periods of post-combustion, the oxygenated gas is injected in the form of several jets each having a flow rate comprised between about 400 and 1200 Nm.sup.3 /h and an injector (11, 12) outlet speed comprised between about 50 and 150 m/s, preferably between about 500 and 900 Nm.sup.3 /h and between about 70 and 125 m/s. Several groups of injectors (11, 12) are used, having an outlet tangential component relative to the vertical axis (X--X) of the furnace (1), successive groups of injectors being disposed at different levels (N.sub.1, N.sub.2) and oriented in alternate circumferential directions. A portion of these injectors have a circumferential component in a first direction and a downward component at a first angle relative to the horizontal, and the other injectors have a circumferential component in an opposite direction and a downward component at a second angle different from the first angle. The oxygenated gas is oxygen having a purity of at least 90%.

REFERENCES:
patent: 3459867 (1969-08-01), Estes
patent: 4249719 (1981-02-01), Knuppel et al.
patent: 4827486 (1989-05-01), Brotzmann et al.
patent: 5444733 (1995-08-01), Coassin et al.
patent: 5572544 (1996-11-01), Mathur et al.

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