Plasma gasification and vitrification of ashes

Details Plasma gasification and vitrification of ashes Plasma gasification and vitrification of ashes

1997-10-10

1999-09-28

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912137, 21912152, 373 22, 110346, 110250, B23K 1000, H05B 700

Patent

active

059582642

ABSTRACT:
This invention discloses a method and an apparatus for gasification and vitrification of ashes, such as produced in a hog-fuel fired boiler, by means of a plasma arc. The ashes are introduced into a shaft furnace where two or three tiltable electrodes are located. The plasma arc is ignited between these electrodes which are then tilted from a horizontal to an essentially vertical position whereby the arc is lengthened and then broken into separate arcs, one between each electrode and the slag accumulated at the bottom of the furnace. This plasma arc helps to burn off the organics in the ashes, producing combustion gases that can be used as a source of energy for the boiler, and to keep the slag in molten state, which allows its periodic removal through a tap hole.

REFERENCES:
patent: 3749803 (1973-07-01), Camacho
patent: 4546483 (1985-10-01), Lugscheider et al.
patent: 4960380 (1990-10-01), Cheetham
patent: 5161471 (1992-11-01), Piekos
patent: 5319176 (1994-06-01), Alvi et al.
patent: 5548611 (1996-08-01), Cusick et al.
patent: 5606925 (1997-03-01), Boen et al.
patent: 5734673 (1998-03-01), Kurahashi et al.

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