Apparatus and method for increasing furnace life in an...

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F - Mech Eng,Light,Heat,Weapons

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307/1

F27D 11/10 (2006.01) C03B 5/03 (2006.01) F27B 3/12 (2006.01) H05B 3/00 (2006.01)

Patent

CA 1040692

ABSTRACT OF THE DISCLOSURE Electrical erosion of refractory in a tank of a furnace for melting thermoplastic materials is reduced by orienting electrodes employed in Joule effect heating of the thermoplastic to limit the current density in the refractory. High electrical resistivity of certain thermoplastics tends to cause a flow of shunted current in relatively low electrical resistivity refrac- tory of the furnace walls during Joule effect heating. Inter electrode spacing and electrode to furnace wall spacing is arranged according to the relative electrical parameters of the furnace system to achieve sufficient Joule effect heating of the thermoplastic without appreciable electrical corrosion. The effects of three phase power sources with various connections is disclosed.

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