By Charles H. Drummond III

Remain up to date with this choice of papers provided on the 69th convention on Glass difficulties on the Ohio country college. issues contain melting and molding, refractories, and environmental concerns and new items.

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The development of a special electrically heated system that can be operated independently from the electrical resistivity of the melt surrounding, was the key to success. AEF is a very good solution for a wide range of glass compositions if focusing to compact construction due to high specific melting capacity, lowest energy consumption, stable and high glass quality, low emissions as well as comfortable operation. 29 All-Electric Furnaces for High Quality Demands in a Wide Range of Glass Compositions 2.

The temperature maximum is not close to the electrodes, but in the middle of the basin because sidewalls and electrodes have heat losses. The power concentration is more uniform and not comparable with with rod electrodes. The temperature homogeneity is high, only few differences can be seen. e. a free convection with a high sensitivity against small deviation in heat losses must be accepted The shelj'furnace with Mo plate electrodes presents a very homogenous temperature field but with some downwards deformations of the colder horizon.

0 kWhlm2. The maximum bottom temperature is approx. 1430 "C. The necessary refining temperature for high quality glass of 1480 "C can not be reached due to instabilities of the batch layer. 69th Conference on Glass Problems . 2 Dodecaaonal furnace with toD and vertical bottom electrodes Characterized by - 12 top electrodes in the upper part of the basin in 3-phase star connection. Two parallel electrodes are connected to same phase. - 6 bottom electrodes in the lower part of the basin in three phase star connection.

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