METHOD AND APPARATUS FOR HEATING PROCESS AIR FOR INDUSTRIAL PURPOSES

摘要

A method and an apparatus are disclosed for heating process air for industrial purposes to a predetermined temperature. The method comprises passing a first air-flow portion through a plasma generator and thus heating said portion to a temperature sufficiently high to cause the ionization of nitrogen and oxygen in the portion and thus form a plasma gas, immediately thereafter adding to said plasma gas a material containing carbon and/or hydrocarbon in sufficient quantity that when said material is reacted with the plasma gas, the ratio CO+H2/CO2+H2O is at least 0.1 thereby substantially avoiding the formation of nitrogen oxide; and immediately thereafter mixing with the plasma gas, with its content of material containing carbon and/or hydrocarbon, a second air-flow in such proportion that the predetermined temperature is achieved in the final air mixture.