Abstract
The present work aims to enhance the energy yield of ozone production via packed-bed reactors. It has been experimentally demonstrated that ozone concentration and corresponding energy yield achieved by packed-bed reactors are significantly higher than that achieved by DBD only. The so-called packed-bed reactor is constructed by packing granular dielectric pellets within a DBD reactor. Two kinds of dielectric materials including glass beads and Al2O3 pellets are tested. Experimental results indicate that an ozone generator packed with Al2O3 pellets results in a higher ozone production compared with one packed with glass beads. The maximum ozone production takes place when Al2O3 pellets with diameter of 2 mm are packed. The maximum ozone concentration, ozone production rate, and energy yield achieved in this study are 61 gO3/m3, 3.7 gO3/hr, and 173 gO3/kWh, respectively. The highest ozone concentration and energy yield achieved with the packed-bed reactor are about 8 and 12 times high as those with DBD reactor, respectively. Although the packed-bed reactors have a shortcoming of high temperature, it can be solved by adding a cooling system and the ozone generation can be improved thereof. As a result, the packed-bed reactor is a promising and state-of-the-art technology for ozone generation based on this study.
ACKNOWLEDGMENTS
The authors would like to express their appreciation for the funding provided by the National Science Council of the Republic of China under grant numbers of NSC-91‐2622-E-008‐005-CC3.