Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1988-06-27
1990-01-30
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
266237, C21C 542, C22B 400
Patent
active
048971120
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for heating primarily so-called nozzles of the kind through which a hot medium in liquid phase or in a liquid phase like condition such as molten metal, e.g. molten steel, is intended to pass.
A hot medium of this kind which is intended to exit from a so-called nozzle or like device through an exit orifice provided therein and which medium shall be maintained at a pronounced elevated temperature may undergo radical local cooling as it passes through the nozzle, due to the lower temperature of the nozzle. This local cooling of the medium can give rise to serious disturbances in operation, such as blocking of the nozzle etc.
This problem can be solved by heating the medium to a given over-temperature. Over-heating of the medium, however, is often unsuitable, inter alia for practical reasons. Another solution is one which involves preheating the nozzle, which is effected by indirect heating methods when practicing known techniques. It is difficult to pre-heat the nozzles in this way, however, while at the same time taking into consideration the technical requirements placed on the nozzle with regard to mechanical strength and material.
The present invention relates to a method and apparatus with which the aforesaid problems are substantially solved. According to preferred embodiments the nozzle can be heated when metal runs through a nozzle and when no metal is present in the nozzle outlet passage.
Thus, the invention relates to a method for heating primarily a so-called nozzle through which a hot medium in liquid phase or in a liquid phase like condition, such as molten metal, e.g. molten steel, is intended to pass in conjunction with casting or molding operations.
The method is particularly characterized by pre-heating the nozzle with the aid of microwaves prior to bringing the medium into contact with the nozzle and/or at least periodically while medium is passing therethrough, said nozzle incorporating material which exhibits a significant loss factor with regard to microwaves, and said heating being effected preferably in order to prevent blockages or the like occurring in the nozzle as a result of a temperature decrease in the medium passing through the nozzle.
The invention also relates to apparatus for heating primarily a so-called nozzle through which hot medium in liquid phase, or in a liquid phase like condition such as molten metal, e.g. molten steel, is intended to pass in conjunction with a casting or molding operation.
The apparatus is particularly characterized in that devices are provided for pre-heating the nozzle with the aid of microwaves prior to bringing the medium into contact with the nozzle and/or for heating the nozzle at least periodically during passage of the medium therethrough, said nozzle incorporating material which exhibits a significant loss factor with regard to microwaves, and said heating being effected preferably in order to avoid blockages and the like from occurring in the nozzle as a result of a temperature decrease in the medium passing therethrough.
The invention will now be described in more detail with reference to an exemplifying embodiment thereof and with reference to the accompanying drawings, in which
FIG. 1 is a schematic, central, vertical sectional view of a first embodiment of a central part of apparatus according to the invention, used in conjunction with a casting operation;
FIG. 2 illustrates schematically a second embodiment of a central part of an apparatus according to the invention, in conjunction with a casting operation;
FIG. 3 illustrates schematically a third embodiment of an apparatus according to the invention, seen in side view;
FIG. 4 illustrates the apparatus shown in FIG. 3 from beneath in said Figure; and
FIG. 5 is a central, vertical sectional view illustrating schematically an embodiment of the apparatus by means of which a nozzle is intended to be heated from the inside of a container vessel.
The apparatus illustrated in FIG. 1 includes a microwave applicator 1 intended for heating a nozzle 2,
REFERENCES:
patent: 3847202 (1974-11-01), Vaughn et al.
patent: 4023783 (1977-05-01), Moreau
patent: 4769066 (1988-09-01), Eidem
Ekerot Sven
Svennebrink Jan
Ekerot Sven
Rosenberg Peter D.
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