Optimization of a Corona Wire-to-Cylinder Ozonizer Critical Comparison With Other Authors Results Part II: Air and N₂ + O₂ Mixtures

Abstract

Experimental results obtained with a wire-to-cylinder ozone generator (5-20cm in length, inner diameter ∼ 12mm), using a 5 to 60 l/h flow-rate range of air or N₂+O₂ mixtures, a negative D.C. high voltage being applied to the wire, are analyzed. As for the “classical” industrial ozonizers, the chemical engineering method, based on the energy density concept (Becker parameter β=P/Q) and the global coefficients of formation K_f and destruction K_d of ozone, was applied. Some peculiar behavior of the K_f coefficient and the role played by nitrogen and its excited levels are pointed out. The results obtained are compared with those of other authors. It appears clearly that the main parameters are not only the Becker parameter but also, and independently, the applied electrical power (P) and gas flow rate (Q) through the residence time (t_r). The residence time (or contact time) of the reactant gas with the corona discharge inside the reactor seems to be about some seconds

Key Words:

• Ozone
• Corona Discharge
• Plasma
• Nitrogen
• Nitrogen Oxides
• Electrosynthesis