Method for transferring heat to molten metal, and apparatus therefor
AssigneeNippon Kokan Kabushiki Kaisha
InventorsHideo Nakamura, Kenji Takahashi, Akichika Ozeki, Shunichi Sugiyama, Masahiro Abe, Takanori Anzai
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Abstract
A method and an apparatus, wherein heat can be effectively transferred to molten metal contained in a reaction vessel. The pressure of the gaseous atmosphere within the vessel is maintained higher than atmospheric pressure. Oxygen gas is blown to a layer of molten slag contained in the vessel through tuyeres set in the reaction vessel, thereby to achieve post-combustion therein. The pressure in the vessel is controlled within the range of 2.0 to 5.0 kg/cm.sup.2 by a pressure regulator.
Claims22
A method for transferring heat to molten metal contained in a closed reaction vessel wherein a gaseous atmosphere is maintained, which comprises the steps of:
- supplying the molten metal into the vessel;
- maintaining the pressure of said gaseous atmosphere within the vessel higher than atmosphere pressure;
- blowing in oxygen gas to the molten metal contained in the vessel;
- and
- blowing oxygen gas for post-combustion in the vessel, thereby to cause post-combustion.
A method for transferring heat to molten metal within a reaction vessel, comprising the steps of:
- supplying the molten metal into said vessel;
- blowing in oxygen gas in molten metal contained in said vessel;
- and
- blowing oxygen gas for post-combustion, into a layer of molten slag, through a plurality of downward-sloping side-blow tuyeres set in the wall of said vessel, opening onto said layer,
A method for transferring heat to molten metal contained in a reaction vessel, comprising the steps of:
- supplying said molten metal into said vessel;
- blowing in oxygen gas to the molten metal contained in said vessel;
- and
- blowing oxygen gas for post-combustion into a layer of molten slag at an angle (.theta.), in a horizontal plane, with respect to the radius of said vessel, and also at upward-sloping and downward-sloping angles, through a plurality of side-blow tuyeres the number of which is represented by n, said angle (.theta.) being represented by:
- 0<.theta.<180.degree./n in the case where n=3, or
- 0<.theta.<45.degree. in the case where n.gtoreq.2.
An apparatus for transferring heat to molten metal, which comprises:
- a reaction vessel adapted to contain the molten metal;
- a regulator, connected with said vessel, for maintaining and controlling the pressure of gaseous atmosphere higher than atmospheric pressure within said vessel;
- a first device for blowing oxygen gas to molten metal contained in said reaction vessel;
- and
- at least one second device for blowing oxygen gas, thereby to cause post-combustion.
Dependencies are inferred from the claim text.