Expectation of ozone generation in alternating current corona discharges

Abstract

An analytical study was made in this paper to calculate the ozone generation inside an ac corona discharge reactor. The corona discharges were formed in a coaxial wire-cylinder reactor. The reactor was fed by dry air flowing with constant rates at atmospheric pressure and room temperature and stressed by an ac voltage. Concentration of the ozone generated inside the reactor was measured as a function of the ac corona current under different discharge conditions. An empirical equation was derived from the experimental results for calculating the ozone concentration generated inside the reactor. The results, that have been calculated by using the derived equation, have agreed with the experimental results over the whole range of the investigated parameters. Therefore, the derived equation represents a suitable criterion for expecting the ozone concentration that will generate by ac coronas in dry air fed coaxial wire-cylinder reactors under any discharge conditions in range of the investigated parameters. V C 2012 American Institute of Physics.

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

“…In order to derive an empirical equation for calculating the ozone concentration inside the reactor, the steps that were followed in our previous studies 24,25 have been applied on the experimental results that are shown in Figures 6-9. By applying these steps, the ozone concentration that generates inside the reactor is determined by using the equation…”

“…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…”

“…With the open systems of single wire-duct reactors, the residence time t r of the flowing air inside the reactor is determined by using the relation 24,25 …”

“…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.…”

“…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.…”