A TORCH DEVICE FOR CHEMICAL PROCESSES HAVING A LEAD INTO WITH A REPLACEABLE VENTURI NOZZLE

摘要

In a plasma torch (I) which consists of two or more tubular electrodes (2, 3) which are located coaxially inside one another and are designed for chemical tre atment 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 mov ed in the axial direction for positioning of the nozzle in relation to the plasma flame. T he lower part of the lead-in tube (4) is exposed to high temperature which can lead to er osion and lacerations, and this part is therefore provided so as to be replaceable. Mo reover 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-formin g gas (13) can be introduced. The plasma-forming gas (13) which flows along the lead-i n tube will simultaneously cool it.