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A Study on Generation of Negative Oxygen Ions Using Surface Dielectric Barrier Discharge
Jae-Ou Chae(채재우),Menglei Zheng(정맹뢰),Wei Wei(위위),Xinhong Chen(진신홍),Hui Wang(왕혜),Yong-Hwan Kwak(곽용환) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Nowadays, ionizers are used very popular for producing negative oxygen ions, which is good for human being health. However, most of the ionizers in the present market are using needle-plate structure in which corona discharge occurs. Comparing with corona discharge, surface discharge is much more compact in the configuration and produces less ozone. For the purpose of finding out the best reactor structure, four types of surface dielectric barrier discharge (DBD) reactors were examined to produce negative oxygen ions at the conditions of 4.24 ㎸ and 356 ㎐. Then influence of frequency (50 ㎐ to 400 ㎐) on the performance of this reactor was also examined on keeping operation voltage and waveform in constant. The results indicated that the surface DBD reactor showed better characteristics for generation of negative oxygen ions when frequency was between 100 ㎐ and 200 ㎐.
A Basic Study on Regeneration System using Plasma for Diesel Particulate Filter
Ruiqiang Liu(류서강),Jae-Ou Chae(채재우),Yong-Hwan Kwak(곽용환),Xinhong Chen(진신홍) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Diesel Particulate Filter (DPF) is the most widely used method to control particulate emissions of diesel engine these days. However, DPF needs periodical regeneration because of soot deposition. Electric discharge plasma, with its strong oxidation characteristics can be utilized in the regeneration process even at lower exhaust temperatures, and the present study also confirmed that the regeneration of DPF was realized when the temperature was elevated from 200℃. Plasma oxidizes NO in the exhaust to NO<SUB>2</SUB> and NO<SUB>2</SUB> in turn oxidizes soot in presence of oxygen to release CO and CO<SUB>2</SUB>. The advantage with plasma regeneration is it proceeds at a lower temperature at which no damage to DPF can happen. Initial experiments were conducted on optimizing NO oxidation to NO<SUB>2</SUB> using plasma reactor. In the next step, regeneration of DPF was carried out. Different parameters such as applied high voltage and gas temperature are studied.