Discharge and NOx removal characteristics of nonthermal plasma reactor with a heated corona wire

The NOx removal characteristics of a wire-to-cylinder type nonthermal plasm a reactor with a heated corona wire were investigated experimentally. A hea ted corona wire can produce energetic electrons and activate the oxidation of generated ozone. It was found that the corona starting voltage decreased with an increase in either the corona wire temperature or the initially fe d NO concentration. At higher corona currents (or voltages) the generated o zone concentration decreased monotonically and drastically with an increase in corona wire temperature. While at lower currents (or voltages), the ozo ne generation increased along with the corona wire temperature to a maximum of about 500 degrees C. A very high removal efficiency of 96% with a 112 ( ppm) concentration of initially fed NO gas was achieved when the elevated c orona wire temperature remained below 200 degrees C, yet with a higher init ial NO gas concentration the removal rate decreased dramatically in a wire- to-cylinder-type test reactor with a 200 mm long corona wire and 26 mm diam eter outer cylinder electrode. (C) 2000 Elsevier Science B.V. All rights re served.