A METHOD FOR HEATING PRIMARILY NOZZLES, AND APPARATUS FOR CARRYING OUT THE METHOD

• Main Authors: SVENNEBRINK, JAN, EKEROT, SVEN
• Format: Patent
• Language: English; French; German
• Published: 02.11.1988
• Edition: 4
• Subjects: BLASTING; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FURNACES; HEATING; KILNS; LIGHTING; MECHANICAL ENGINEERING; OVENS; PERFORMING OPERATIONS; POWDER METALLURGY; RETORTS; TRANSPORTING; WEAPONS

Procédé pour chauffer une buse (2) devant être traversée par un milieu chaud (10) en phase liquide ou dans un état ressemblant à la phase liquide, comme un métal en fusion, par exemple de l'acier en fusion, la traversée étant accompagnée d'une opération de coulée ou de moulage. Le procédé est caractérisé en particulier en ce que la buse (2) est préchauffée avant d'être mise en contact avec le milieu (10) et/ou est chauffée au moins périodiquement pendant que le milieu traverse la buse. Cette dernière est chauffée à l'aide de micro-ondes et la buse comporte des matériaux présentant un facteur de perte significatif en ce qui concerne les micro-ondes. On chauffe la buse de préférence afin d'en éviter le bouchage ou des difficultés analogues dues à la chute de température dudit milieu traversant la buse. On décrit également un appareillage propre à la réalisation dudit procédé. PCT No. PCT/SE86/00588 Sec. 371 Date Jun. 27, 1988 Sec. 102(e) Date Jun. 27, 1988 PCT Filed Dec. 29, 1986 PCT Pub. No. WO87/04100 PCT Pub. Date Jul. 16, 1987.A method for heating primarily a so-called nozzle (2) through which a hot medium (10) in a liquid phase or in a liquid phase like condition, such as a molten metal, e.g. molten steel, is intended to pass in conjunction with a casting or molding operation for example. The method is particularly characterized in that the nozzle (2) is pre-heated prior to being brought into contact with the medium (10) and/or is heated at least periodically while medium is passing through the nozzle. Heating of the nozzle is effected with the aid of microwaves and the nozzle includes material which exhibits a significant loss factor with regard to microwaves. The nozzle is heated preferably for the purpose of avoiding blockages and the like from occurring in the nozzle as a result of a temperature decrease in the medium passing therethrough. The invention also relates to apparatus for carrying out the method.