Channel: Furnace technology
Electrode configurations in all-electric furnaces; glass melt power density

2013-03-01 | Furnace technology

Glass melt power density has been studied at different arrangements of electrodes in all-electric melting furnaces. The results of mathematical modelling showed that there is a very close relationship between the distribution of power density in glass melt and the temperature field and, therefore, the intensity of convective currents of the glass melt can be influenced by suitably arranging the electrodes.

The power density in glass melts has been studied at different arrangements of electrodes in all-electric melting furnaces
The power density in glass melts has been studied at different arrangements of electrodes in all-electric melting furnaces. Bottom, top and plate electrodes were arranged in the model furnace in hexahedron form of about 1 metre along its edges. The results of mathematical modelling showed that there is a very close relationship between the distribution of power density in glass melt and the temperature field and, therefore, by means of suitable arrangement of electrodes it is possible to influence the intensity of convective currents of the glass melt. From evaluated dependencies of power density distribution near the tips of electrodes, it follows that in the case of rod electrodes, the power density decreases on increasing the length of the electrodes.
Opposite behaviour happens with plate electrodes because the power density distribution in the centre of the basin between the electrodes increases on increasing the distance of the electrodes from the bottom of the furnace. The volumes of glass melt surrounding the electrodes where the power densities are superior to pmean (60,000 W.m-3)  have also been evaluated by means of mathematical modelling. The volumes are very small with regards to  the total volume of the furnace and do not exceed 22 per cent. Mathematical modelling of glass melting furnaces by means of the CFD programme Fluent leads to acceptable computational subservience to the study of power density distribution in all-electric melting furnaces.
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Article taken from Glass Machinery Plants & Accessories bi-monthly magazine (6 issues per year)
Year: 2012 number: 5
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