A thermal non-transfer arc V-type torch plasma

Abstract

Conventional linear DC plasma torches are known to have a relative long tail flame wherein a high temperature chemical reaction can be performed or where the plasma can act as a heat transfer medium. Introducing solid particles into these plasma torches generally destabilizes the plasma and may cause extensive erosion on the anode, thus shortening the torch operational time significantly. In this torch the solid particles are exposed to the arc temperature and not only the tail flame temperature. This torch enables one to introduce solid particles in very close proximity of the plasma arc and if the particle velocity is optimized, the particles may even penetrate the arc. This paper presents the design and typical operating parameters of a V-type plasma system, and discuses the advantages and disadvantages of such a system.