Studies in the Distribution of Temperature Through Molten Glasses in a Tank-Melting Furnace. Part V. The Distribution of Temperature in Commercial Tank-Melting Furnaces
JSGT 1947 V31 T122-T133
The temperatures from surface to bottom of ten different glasses in commercial tank furnaces were determined by three different methods of measurement. With one exception all determinations were carried out in the working chamber of the furnace. The gradients, defined by the difference in temperature between glass 8 inches below the surface and lower depths, varied from 1° per inch in the case of a Pyrex glass with a total iron oxide content of 0·088% to 17° per inch for a dark-green bottle glass containing 1·28% total iron oxide in addition to 0·68% MnO and 0·48% Cr2O3. A relationship was established between the iron oxide concentration of the ten glasses examined and their respective temperature gradients when melted in a commercial furnace. After each measurement a sample of each glass was taken and subsequently re-melted in the small-scale laboratory furnace and the temperature gradient ascertained under these conditions. Since it was observed that close correlation exists between the values of the gradients in the commercial and in the laboratory tank furnace, it would seem possible to determine the temperature gradient to be expected, and provided for, in a commercial tank furnace, by making measurements on the gradient in a laboratory scale furnace.
R. Halle
