Method of stabilizing arc voltage in plasma arc furnace and apparatus for effecting same

摘要

A method and apparatus wherein a plasma arc column is embraced by a gas flow along its entire length, within a furnace melting chamber, for being cooled and constricted. The gas drawn off the melting chamber, cleaned and cooled, may be used for this purpose. The apparatus is provided with a closed circuit including a heat exchanger, a dust collector, a gas flow controller and a gas blower. The circuit is used for drawing off the gas from the melting furnace and supplying it into an annular space between the nozzle of the plasma generating means and the outer housing.