Impedance heating system with skin effect particularly for railr

Details Impedance heating system with skin effect particularly for railr Impedance heating system with skin effect particularly for railr

1980-05-28

1983-10-04

Bartis, A.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

174111, 219300, 219301, 219306, 219315, 219316, F24H 120, H05B 382

Patent

active

044081170

ABSTRACT:
An impedance skin effect heating system for tanks or vessels containing a liquid includes a heating unit having a rigid outer pipe conductor mounted through an opening in the tank and extending therein, to be immersed in the liquid and a rigid central conductor supported within the outer pipe conductor by spaced-apart temperature resistant asbestos insulation discs. The insulation discs are held to the central conductor by flanking metal collars welded to the central conductor for insertion of the central conductor into the outer pipe conductor while maintaining the desired position of the insulation discs on the central conductor. An end cap is welded to both the outer conductor pipe and the central conductor, sealing the ends thereof and establishing electrical contact therebetween. The central and outer pipe conductors connected to a source of AC power, usually through a transformer, to cause the outer pipe conductor and central conductor to generate heat via impedance, reactance, and hysteresis and eddy currents. A plurality of such heating units may be immersed in the tank and powered by a three-phase AC power source with the plurality of units being balanced on a three-phase transformer. An additional heat fluid transfer heating subsystem may be provided by pumping a heat transfer fluid through a central conductor formed as a pipe, and utilizing tubing to carry the heat transfer fluid to the desired point of use. The central conductor, outer pipe conductor and end cap are designed to have sufficient thickness that the current flow therethrough is concentrated by skin effect on the inside surface of the pipe conductor and end cap and on the outer surface of the central conductor, so that the surfaces of the conductors and end cap contacted by the liquid to be heated or the heat transfer fluid have no voltage or current thereon.

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