http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유전체 방전 플라즈마 공정에 의한 일산화질소 제거 공정 모델링
목영선(Young-Sun Mok) 한국산업융합학회 2003 한국산업융합학회 논문집 Vol.6 No.4
This study proposes a mathematical model to characterize the removal of nitrogen oxides in a dielectric barrier discharge plasma process. As well as the reactions between nitrogen oxides, water vapor, oxygen and nitrogen, the model takes into account the effect of ethylene often used as a chemical additive to reduce the power consumption of the process on the removal of nitrogen oxides. Since the concentrations of the radicals concerned in the main reactions including O, OH, H and N should be calculated to predict the removal efficiency of nitrogen oxides, they were theoretically derived. The parameters affecting the removal of nitrogen oxides, such as initial concentration, discharge power, humidity, and ethylene concentration were experimentally evaluated, which were compared with the calculated results to verify the validity of the model proposed. The predicted concentrations of several byproducts formed in this process were also presented and discussed. The effects of several parameters mentioned above on the removal of nitrogen oxides were reasonable described by the proposed model.
유전체장벽방전을 이용한 촉매공정의 질소산화물 저감성능 향상
목영선 ( Young Sun Mok ),남창모 ( Chang-mo Nam ) 한국산업융합학회 2006 한국산업융합학회 논문집 Vol.9 No.1
The ozone produced by a dielectric barrier discharge device was injected into the exhaust gas to oxidize a part of NO to NO<sub>2</sub>, and then the exhaust gas containing the mixture of NO and NO<sub>2</sub> was further treated in a catalytic reactor where both NO and NO<sub>2</sub> were reduced to N<sub>2</sub> in the presence of ammonia as the reducing agent. The NO<sub>2</sub> content in the mixture of NO and NO<sub>2</sub> was changed by the amount of ozone added to the exhaust gas. The experiments were primarily concerned with the effect of reaction temperature on the catalytic NO<sub>x</sub> reduction at various NO<sub>2</sub> contents. The increase in the NO<sub>2</sub> content by the ozone injection remarkably improved the performance of the catalytic NO<sub>x</sub> reduction, especially at low temperatures.
플라즈마 소수성 코팅을 이용한 실리케이트계 황색형광체의 내구성 개선에 관한 연구
목영선 ( Young Sun Mok ),장두일 ( Doo Il Jang ),조진오 ( Jin Oh Jo ),고란영 ( Ran Young Ko ),이상백 ( Sang Baek Lee ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.2
Hydrophobic coating on a silicate-based yellow phosphor (Sr2SiO4:Eu2+) was carried out by using hexamethyldisiloxane (HMDSO) precursor in an atmospheric pressure dielectric barrier discharge plasma reactor, eventually to improve the long-term stability and reliability of the phosphor. The phosphor powder samples were characterized by a scanning electron microscope (SEM), a transmission electron microscope (TEM), a fluorescence spectrophotometer and a contact angle analyzer. After the coating was prepared, the contact angle of the phosphor powder increased to 133.0o for water and to 140.5o for glycerol, indicating that a hydrophobic layer was formed on its surface. The phosphor coated with HMDSO exhibited photoluminescence enhancement up to 7.8%. The SEM and TEM images of the phosphor powder revealed that the plasma coating led to a morphological change from grain-like structure to smooth surface with 31~46 nm thick hydrophobic layer. The light emitting diode (3528 1 chip LED) fabricated with the coated phosphor showed a substantial enhancement in the reliability under a special test condition at 85 oC and 85% relative humidity for 1,000 h (85/ 85 testing). The plasma-mediated method proposed in this work may be applicable to the formation of 3-dimensional coating layer on irregular-shaped phosphor powder, thereby improving the reliability.
저온 플라즈마ㆍ촉매 복합공정을 이용한 트리클로로에틸렌의 분해에 관한 연구
목영선(Young-Sun Mok),남창모(Chang-Mo Nam) 한국산업융합학회 2003 한국산업융합학회 논문집 Vol.6 No.4
A non-thermal plasma process combined with Cr₂O₃/TiO₂ catalyst was applied to the decomposition of trichloroethylene (TCE). A dielectric barrier discharge reactor operated with AC high voltage was used as the non-thermal plasma reactor. The effects of reaction temperature and input power on the decomposition of TCE and the formation of byproducts including HCI, Cl₂, CO, NO, NO₂ and O₃ were examined. At an identical input power, the increase in the reaction temperature from 373 K to 473 K decreased the decomposition of TCE in the plasma reactor. The presence of the catalyst downstream the plasma reactor not only enhanced the decomposition of TCE but also affected the distribution of byproducts, significantly. However, synergistic effect as a result of the combination of non-thermal plasma with catalyst was not observed, i.e., the TCE decomposition efficiency in this plasma-catalyst combination system was almost similar to the sum of those obtained with each process.