A TORCH DEVICE FOR CHEMICAL PROCESSES HAVING THREE AXIALLY MOVABLE ELECTRODES

摘要

A plasma torch is designed for energy supply for example for chemical processes. The plasma torch comprises at least three solid tubular electrodes (1, 2 and 3) located coaxially inside one another. The electrodes (1, 2, 3) can be moved axially in relation to one another. They are preferably electrically insulated (5, 6, 7) from one another and have connections for electrical power (8, 9, 10). When three electrodes are used, the middle electrode (2) is used as an auxiliary electrode or ignition electrode. It is then coupled with one of the other electrodes (1). The distance to third electrode (3) is adapted to the working voltage in such a way that a jump spark is obtained when the working voltage is connected. During operation the auxiliary electrode (2) is withdrawn from the plasma zone thus preventing it from continuously forming the foot point of the arc.