Abstract: The present invention relates to a plasmatron structure for heating working gas in a DC arc discharge at the atmospheric or lowered pressures and can be used for different electronic, engineering, or vehicle-building industries and for medicine. An object of the invention is to provide improved effectiveness of process gas activation and increased completeness of plasma-chemical reactions. These objects are achieved in a DC arc plasmatron comprising a rod cathode, a nozzle anode having a body member and a through axial orifice, a power supply unit connected to both electrodes, and a gas system for feeding plasma-forming gas into inter-electrode space and supplying suitably selected technologic gas or gas mixture into the anode orifice through an internal opening communicating with said orifice and positioned between its inlet and outlet parts.

Abstract: The present invention concerns a DC arc plasmatron which is a plasma generator at the atmospheric pressure having a structure suitable for improving chemical activity of plasma. The DC arc plasmatron according to the invention comprises a rod cathode 110 connected to a DC power supply 1000, and formed to be positioned close to a nozzle to be a negative; a nozzle anode 120 formed on the nozzle to be a positive, being an opening to inject plasma into a functional gap 150 and having an anode inlet 122, wherein the plasma is created by gas discharge for forming the plasma between the cathode and the anode; a functional anode gap formed on the nozzle to be a positive so that either a function gas or a gas mixture is supplied on some part of the passage of the anode to make it react with the plasma forming gas through the nozzle inlet; and a gas supply unit for supplying a plasma forming gas flowing through the nozzle anode from the side of the rod cathode.