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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.
A Study on Emission Reductions of Diesel Engine Using Plasmatron Fuel Converter
Ho-Beom Ki(기호범),Bong-Soo Kim(김봉수),Yong-Hwan Kwak(곽용환),Woo-Hyung Kim(김우형),Won-Kyung Lim(임원경),Jae-Ou Chae(채재우) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
Improvements in internal combustion engine and aftertreatment technologies are needed to meet future environmental quality goals. Plasmatron fuel converters provide a rapid response, compact means to transform a wide range of hydrocarbon fuels (including gasoline, natural gas and diesel fuel) into hydrogen-rich gas. Hydrogen-rich gas can be used as an additive to provide NOx reductions of more than 80% in diesel engine vehicles by enabling very lean operation or heavy exhaust engine recirculation. For diesel engines, use of compact plasmatron reformers to produce hydrogen-rich gas for the regeneration of NOx absorber/absorbers and particulate traps for diesel engine exhaust after-treatment could provide significant advantages. Recent tests of conversion of diesel fuel to hydrogen-rich gas using a low current plasmatron fuel converter with non-equilibrium plasma features are described.
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 ㎐.
디젤엔진의 공해물질 저감을 위한 플라즈마 개질기 특성 연구
채재우(Chae Jae Ou),최인철(Choi In Chul),Knak Alexandre(Knak Alexandre),탁선재(Tak Sun Jae),이창민(Lee Chang Min),곽용환(Kwak Yong Hwan) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, a new plasma system is introduced to the generation of hydrogen-rich gas for decreasing pollutants from diesel engine and for other applications. The designed plasma system allows to reform diesel fuel i nto hydrogen rich gas (H₂ + CO). Plasma boosts partial oxidation reaction that reforms hydrocar bon fuels into hydrogen-rich gas partial oxidation (at oxygen/carbon ratio = 1, exothermic reactio n). As a source of non-equilibrium plasma, we used a low current plasmatron with convective co oling of electrodes. Power supply of a plasma generator was as followings: DC power supply (400-800V, 1-4A) and pulse generator (2.5-3.5kV, 20-1OOmA, 10-15kHz). We gauged the gas composition in reformed gas by GC-TCD, concentration change of hydrogen as a function of current applied to the reformer. The outcomes of experiments allow to draw a conclusion about high performance of a d esigned plasma system. Potential exhaust aftertreatment applications: NO_x, absorber catalyst regeneration, HC SCR aftertreatment, and operation of Diesel Engine on air-fuel mixture with hydrogen admixtures.<br/>
Plasma Discharge Initiation of Explosives in Rock Blasting Application
채재우(Jae-Ou Chae),푸치코프 발렌틴(Poutchkov V M),정영준(Jeong Young-Jun),바이쿤타차 라비(V Ravi),최인철(In-Chul Choi),이창민(Chang Min Lee),곽용환(Yong-Hwan Kwak),구형준(Hyung-Joon Koo),쉬멜레프(Shmelev V M),데니쉐프(Denicaev A.A),김남수(Kim 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The reliable plasma discharge initiation system for the explosive volumetric combustion charge has been designed, investigated and developed for the practical application. Laboratory scale experiments were carried out before conducting the large scale field tests. The resultant explosions gave rise to less noise, no seismic vibration and good specific explosive consumption for rock blasting. Importantly, the technique was found to be safe and environmental friendly.