Method for heating primarily nozzles, and apparatus for carrying out the method

• Main Authors: SVENNEBRINK; JAN, EKEROT; SVEN
• Format: Patent
• Language: English
• Published: 30.01.1990
• 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

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.