Calculation of ozone generation by positive dc corona discharge in coaxial wire-cylinder reactors

Abstract

A theoretical equation has been derived in this paper for calculation of ozone generation by positive dc corona discharge in coaxial wire-cylinder reactors. The derived equation has been based on the theories of the positive dc coronas reported in the literature and extended to account the ozone destruction within the corona discharge plasma generated in the reactor. The equation has been investigated with experimental results for ozone generated in a coaxial wire-cylinder reactor under different discharge conditions. The reactor was stressed with a positive dc voltage and fed by dry air flowing with constant rates at atmospheric pressure and room temperature. The theoretical results calculated by the derived equation have shown good agreement with the experimental results over the whole range of the investigated parameters. Subsequently, the derived equation is valid to predict the ozone concentration generated in the investigated reactor under any discharge conditions.

Positive direct current corona discharges in single wire-duct electrostatic precipitators

“…Because the physicochemical reaction processes take place inside the ionization region, the ozone molecules are generated inside this region only. [23][24][25] With the positive dc corona discharges in the atmospheric air at normal temperature and pressure, the volume of the non-thermal plasma V plasma that forms around the thin wires is determined by using the equation 25,32,33 V plasma = π (0.562255r…”

“…The air flowing from outlet of the reactor has been passed through a quartz cell installed in UV-VIS spectrophotometer (SHIMADZU-1200), where the absorbance of the ozone was recorded at a wavelength of 253.7 nm. [22][23][24][25] The ozone concentration [O3] in the flowing air was calculated from the absorbance measurements by using Beer-Lambert law. 6 The average room temperature during the experimental measurements was about 288 K. Every point of the experimental results represents the mean of three independent readings under the same operating conditions.…”

“…Moreover, the value of the discharge power P that dissipates inside the reactor in the form of heat energy is not sufficient to heat the gas to the temperature T required to decompose the ozone molecules, where P = IV and TαP. In this case, almost all the oxygen atoms that are created inside the sheath of the non-thermal plasma turn into ozone molecules according to the reactions [23][24][25] …”

“…Subsequently, two of the authors of this paper have studied previously the ozone generation with the corona discharges under different operating conditions. [22][23][24][25] From another point of view, single wire-duct arrangement is being used over a wide range as discharge electrodes in the electrostatic precipitators. [26][27][28][29] Therefore, the corona discharges were studied in this paper inside dry air fed single wire-duct reactor under positive dc voltage.…”

Spatial distribution of the electrical potential and ion concentration in the downstream area of atmospheric pressure remote plasma

“…the distance between the bottom electrode and the substrate. 11,17,18 The used chamber and electrode design was entirely different from such well studied systems equipped by remote low-temperature plasma and operated under atmospheric pressure as jet systems, [27][28][29] corona discharge systems, [30][31][32] microwave discharge systems. [33][34][35] In the cases of all above mentioned systems, plasma (i) was spatial inhomogeneous and (ii) freely collapsed in the chamber area between the discharge area and the substrate.…”