Electrical study of DC positive corona discharge in dry and humid air containing carbon dioxide

Laboratoire d'Électronique des Gaz et des Plasmas, Université de Pau et des Pays de l'Adour, 64000 Pau, France

Corresponding author: jean-francis.loiseau@univ-pau.fr

Received: 17 January 2003
Revised: 25 April 2003
Accepted: 2 June 2003
Published online: 16 July 2003

Abstract

As most part of the industrial effluents contain carbon dioxide and water vapour, it is interesting to study from an electric point of view ‘basic’ gas mixtures including air and various amounts of these gases, in order to precise how the corona discharge inception takes place in such mixtures. In a DC point-to-plane reactor, distinct parameters are varied, such as discharge current, partial pressure of CO₂, and relative humidity. Gap voltage and streamer frequency are experimentally measured as functions of the discharge current. Current waveforms are recorded in various gas mixtures and electrical conditions. DC and impulsional current components, as well as streamer frequency are also plotted as functions of the CO₂ partial pressure for dry and water saturated mixtures. For dry or wet mixtures, 5% CO₂ in volume appears to be the proportion allowing the establishment of a stable corona discharge with the lowest energy cost.