On assessment of ozone generation in dc coronas

Abstract

A review is made of the theories proposed for quantitative assessment of ozone generation in dc-energized electrostatic precipitators. The underlying simplifying assumptions adopted by these theories are discussed. Among the most important assumptions is ignoring the ozone destruction which takes place at high ozone generation rates. Therefore, a modification is proposed to account for ozone destruction in assessing the generation of ozone. Subsequently, a linear relationship between the ozone generation rate after being modified and the discharge power is obtained by using the present experimental results or the data published previously.

Characteristics of an electrostatic precipitator for submicron particles using non-metallic electrodes and collection plates

“…The average ozone concentration was proportional to the power consumption of the ionizers. This finding was in quite good agreement with the results of previous studies (Yehia, Abdel-Salam, & Mizuno, 2000;Yehia, Mizuno, & Takashima, 2000). In particular, when the maximum 10 kV was applied to the ionizers in 16 channels, the ozone concentration was less than 2 ppb, which was significantly lower than the 60-80 ppb limit set out in the EPA and WHO regulations.…”

“…The maximum result was 40 000 ppb L/min for a power consumption of approximately 5 W (i.e. 2 ppb  20 000 L/min), which is much lower than the value of 500 000 ppb L/min previously reported for the same power consumption (Yehia, Abdel-Salam, & Mizuno, 2000;Yehia, Mizuno, & Takashima, 2000). This indicates that the use of a carbon brush precharger that does not produce ozone as a byproduct could be a more promising environmentally friendly method of charging than that used in existing corona dischargers, particularly those used in industrial ESPs, as well those used indoors.…”

“…4;Wang, Pereira, & Hung, 2004). Furthermore, the ozone that is normally generated as a byproduct of corona discharge in an ESP can cause serious damage to respiratory organs, and causes deterioration in many materials, and thus the daily 8-hour maximum ozone concentration is regulated to less than 60-80 ppb by the WHO, EPA, and EC, among others Bell, Peng, & Dominici, 2006;Liu, Guo, Li, & Sheng, 2000;Yehia, Abdel-Salam, & Mizuno, 2000;Yehia, Mizuno, & Takashima, 2000).…”

Comparison of styrene removal in air by positive and negative DC corona discharges

“…They reported that positive polarity discharge is much more effective than the negative one. While some studies showed that positive corona discharge is superior to the negative one, other studies found opposite results (Yehia et al 2000;Marotta et al 2008;Schiorlin et al 2009). It is still necessary to study the effect of discharge polarities on VOC removal efficiency.…”

Characteristics of dielectric barrier discharge reactor for material treatment

“…In some previous studies [5][6][7][8], the authors have investigated the silent discharge current-voltage characteristics in coaxial wire-cylinder reactor aimed for ozone generation. On the other hand, reactors with parallel plate geometry are more suitable for material processing.…”