A TORCH DEVICE FOR CHEMICAL PROCESSES

摘要

In a plasma torch (1) which consists of two or more tubular electrodes (2, 3) which are located coaxially inside one another and are designed for chemical treatment of the reactant, a lead-in tube (4) for supply of reactant is located coaxially in the internal electrode (3) and consists of a liquid-cooled tube provided with a heat-insulating layer (10, 11) on the outer surface. Furthermore the lead-in tube (4) can be moved in the axial direction for positioning of the nozzle in relation to the plasma flame. The lower part of the lead-in tube (4) is exposed to high temperatures which can lead to erosion and lacerations, and this part is therefore provided so as to be replaceable. Moreover the tube can be provided with a narrowing in the outlet opening in the form of a venturi nozzle, in order to increase the exit velocity of the reactant. Between the lead-in tube and the internal electrode an annular passage is formed into which plasma-forming gas (13) can be introduced. The plasma-forming gas (13) which flows along the lead-in tube will simultaneously cool it.