69th Conference on Glass Problems, CESP Volume 30, Issue 1 by Charles H. Drummond III

By Charles H. Drummond III

Remain up to date with this selection of papers awarded on the 69th convention on Glass difficulties on the Ohio nation college. issues comprise melting and molding, refractories, and environmental matters and new items.

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Additional info for 69th Conference on Glass Problems, CESP Volume 30, Issue 1 (Ceramic Engineering and Science Proceedings)

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The results of modelling are ratified by real conditions of each furnace type: shelf furnace with Mo plate electrodes: High sensitivity because of non-fixed convection. The result is fluctuation of glass quality. 38 . ' K-' (TERMISIL, Poland). Left: Starting of placement of the batch layer after fill melting. Right: Cold-top melting condition with very homogenious batch layer. 4. COMPARISON OF T W O AEF FOR SODA-LIME GLASS Based on model comparison as one example of AEF to melt 45 tid of soda lime as well based on technological pro and cons due to feedback from the glass factories it shall be demonstrated the essential prerequisites for High Quality Soda Lime Glass.

J . Am. Ceram. 67 (1984) no. 8, pp. 564-567 28 + 69th Conference on Glass Problems ALL-ELECTRIC FURNACES FOR HIGH QUALITY DEMANDS IN A WIDE RANGE OF GLASS COMPOSITIONS Lars Biennek, Harald Jodeit, and Hans-Jurgen Linz JSJ Jena-Maua, Germany ABSTRACT All-electrically heated furnaces (AEF) are characterized by vertical flow of the melt. The melt itself is continuously and completely covered by a batch layer (cold top). The electric power is released as Joule’s heat between the electrodes directly within the glass.

The power density is concentrated around the molybdenum rods. and between the electrodes, while between electrodes and sidewalls only a minimum of heat is generated. Consequently the temperature distribution shows the maximum values at the electrode dips. The upward convection is very well stabilised at the electrodes to form two convection circles (upwards in the centre and downwards at the sidewalls). But there is no adjustment of heat generation over the electrode length, and therefore, a secondary convection circle is formed in the lower part between the electrodes.

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