Plasma arc furnace with improved replaceable electrodes

Details Plasma arc furnace with improved replaceable electrodes Plasma arc furnace with improved replaceable electrodes

1999-02-04

2000-01-18

Paschall, Mark

Electric heating

Metal heating

By arc

21912137, 21912149, 21912152, 110246, 373 20, 373 22, B23K 900

Patent

active

060159634

ABSTRACT:
A plasma arc waste treatment furnace is equipped with a plasma arc torch having an electrode formed from a conductive refractory material. The refractory electrode can be operated at very high temperatures and does not need to be water-cooled. This eliminates a need for de-ionized water used in prior art furnaces. Arc erosion takes place very slowly and this results in long operating intervals of the furnace between shutdowns needed for electrode replacement. The electrode can be successfully operated as a cathode and this mode of operation improves melting efficiency.

REFERENCES:
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patent: 4710607 (1987-12-01), Wilhelmi et al.
patent: 4801435 (1989-01-01), Tylko
patent: 4918282 (1990-04-01), Cheek
patent: 5548611 (1996-08-01), Cusick et al.
patent: 5734673 (1998-03-01), Kurahashi et al.

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