Electric heating – Metal heating – By arc
Patent
1994-05-26
1996-10-01
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912149, 21912151, 21912152, 31511151, B23K 1000
Patent
active
055608442
ABSTRACT:
A liquid film stabilized induction plasma torch comprises a cylindrical torch body made of cast ceramic or polymer-matrix composite, a coaxial cylindrical plasma confinement tube mounted inside the torch body, a gas distributor head secured to one end of the torch body to supply the confinement tube with gaseous substances, a cylindrical and coaxial induction coil embedded in the ceramic or polymer-matrix composite of the torch body, and a thin annular chamber separating the coaxial torch body and confinement tube. A high velocity cooling liquid flows through the thin annular chamber. The confinement tube is made of porous ceramic material through which cooling liquid from the annular chamber permeates. The permeating cooling liquid forms on the inner surface of the confinement tube a thin liquid film subjected to the high temperature of the plasma produced in the confinement tube. Cooling liquid from the film is vaporized and the resulting vapor forms the main body of the plasma gas required to operate the plasma torch. The permeable wall induction plasma torch arrangement can be used to generate a plasma of water vapor (steam) and of a wide range of vaporizable liquids. This can also be achieved by means of a hybrid combination of direct current and radio frequency induction plasma torches.
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Boulos Maher I.
Jurewicz Jerzy W.
Paschall Mark H.
Universite de Sherbrooke
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