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활성탄 또는 촉매가 장착된 배리어 유전체 방전 하이브리드. 공기청정 시스템의 나노입자 및 잔류 오존 제거 특성
변정훈,황정호,지준호,강석훈,Byeon, Jeong-Hoon,Hwang, Jung-Ho,Ji, Jun-Ho,Kang, Suk-Hoon 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.4
DBD(Dielectric Barrier Discharge) plasma in air is well established for the production of large quantities of ozone and is more recently being applied to aftertreatment processes for HAPs(Hazardous Air Pollutants). Aim of this work is to determine design and operating parameters of a hybrid air cleaning system. DBD and ESP(Electrostatic Precipitator) are used as nano particle charger and collector, respectively. Pelletized MnO$_2$ catalyst or activated carbon is used fer ozone decomposition or adsorption material. AC voltage of 7~10 KV(rms) and 60 Hz is used as DBD plasma source. DC - 8 KV is applied to the ESP for particle collection. The overall particle collection efficiency for the hybrid system is over 85 % under 0.64 m/s face velocity. Ozone decomposition efficiency with pelletized MnO$_2$ catalyst or activated carbon packed bed is over 90 % when the face velocity is under 0.4 m/s in dry air.
배리어 유전체 방전형 2단 전기집진기의 나노입자 집진 및 잔류 오존 제거 특성
변정훈(Jeong-Hoon Byeon),지준호(Jun-Ho Ji),윤기영(Ki-Young Yoon),황정호(Jungho Hwang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
DBD(Dielectric Barrier Discharge) plasma in air is well established for the production of large quantities<br/> of ozone and is more recently being applied to aftertreatment processes for HAPs(Hazardous Air Pollutants).<br/> Although DBD high electron density and energy, its potential use as nano and sub-micron sized particle<br/> charging are not well known. Aim of this work is to determine design and operating parameters of a two-stage<br/> ESP with DBD. DBD and ESP are used as particle charger and precipitator, respectively. We measured<br/> particle precipitation efficiency of two-stage ESP and estimated ozone decomposition of both pelletized MnO2<br/> catalyst and pelletized activated carbon. To examine the particle precipitation efficiency, nano and sub-micron<br/> sized particles were generated by a tube furnace and an atomizer. AC voltage of 7~10 kV(rms) and 60 Hz is<br/> used as DBD plasma source. DC -8 kV is applied to the ESP for particle precipitation. The overall particle<br/> collection efficiency for the two-stage ESP with DBD is over 85 % under 0.64 m/s face velocity. Ozone<br/> decomposition efficiency with pelletized MnO2 catalyst or pelletized activated carbon packed bed is over<br/> 90 % when the face velocity is under 0.4 m/s in dry air.
구리가 코팅된 활성섬유탄소의 항균 및 VOC 흡/탈착 특성
변정훈(Jeong Hoon Byeon),윤기영(Ki Young Yoon),박재홍(Jae Hong Park),고병주(Byung Ju Ko),윤희승(Hee Seung Yoon),황정호(Jungho Hwang),유승곤(Seung Kon Ryu) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The aim of this study is to assess the applicability of simultaneous control of a microbial colonization and a volatile organic compounds (VOC) penetration using a copper plated activated carbon fiber (ACF). Antimicrobial material, generated by using an electroless copper-plating, applied to the ACF filter media and tested for their ability to reduce microbial colonization and VOC penetration. This study contribute to the filtration complexity problems concerning the removal of microbial contamination and VOC penetration of air filters in the heating, ventilating, air-conditioning and air cleaning systems commonly used in indoor environments, hospitals, electronic industry, pharmaceutical industry and other environments where the absence of contaminating microorganisms and VOC is required.
피치계 활성섬유탄소의 무전해 구리 코팅 및 NO 저감특성
변정훈(Jeong Hoon Byeon),윤희승(Hee Seung Yoon),황정호(Jungho Hwang),유승곤(Seung Kon Ryu) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Removal of NO was carried out on electroless copper-plated activated carbon fiber (ACF/Cu) based on three different copper plating times in a packed bed tubular reactor under varying reaction temperatures (300-400℃) under fixed inlet NO concentration (160ppm, N₂ carrier). Pitch fibers were prepared from identical petroleum-derived isotropic pitch precursors (IPPs) by meltspinning. The fibers obtained were stabilized, carbonized, and then activated by steam. The ACF was sensitized with Pd-Sn catalytic nuclei via a single-step activation approach. This sensitized ACF was used as precursors for obtaining copper plated ACF via electroless plating. Sensitization of the ACF surfaces promoted specific plating of copper on the ACF surfaces. As a result, ACF uniformly coated with copper particles were obtained with reduced copper plating in the reaction solution.
변정훈(Jeong-Hoon Byeon),박재홍(Jae-Hong Park),황정호(Jung-Ho Hwang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Decomposition of ozone at room temperature was investigated comparatively with commercial monolithic ozone decomposition catalyst (ODC, MnO₂) and monolithic photo catalyst (TiO₂). The effects of residence time, UV (ultraviolet) light dependence and ozone concentration on the conversion was presented. UV ray was irradiated using BLB (black light blue) lamp (315~400 ㎚), supplied with a constant intensity in the reactor. The concentration of ozone in the square-shape reactor can be controlled by combining the DBD (dielectric barrier discharge) reactor with an AC high voltage supply system. The catalytic performance, in presence of UV irradiation did not show significant changes for MnO₂ catalyst. TiO₂ catalyst was the different case, which showed higher decomposition activity in presence of UV irradiation. Deactivation of catalyst detected by real ? time ozone monitor for 120 hours with a constant inlet ozone concentration.
변정훈(Jeong-Hoon Byeon),박재홍(Jae-Hong Park),황정호(Jungho Hwang) 한국실내환경학회 2004 한국실내환경학회지 Vol.1 No.1
Decomposition of ozone at room temperature was investigated by comparing between commercial monolithic ozone decomposition catalyst (ODC; MnO₂) filter and monolithic photocatalyst (TiO₂) filter. The effects of residence time, UV (ultraviolet, A type) irradiation, and upstream ozone concentration on the ozone conversion were discussed. UV ray was irradiated using four BLB (black light blue) lamps (λ: 310∼400㎚) of constant intensity. The upstream concentration of ozone was controlled by an electrostatic ozone generator. For ODC performance, the presence of UV irradiation slightly affected initial ozone conversion compared with no UV irradiation condition. However, for photocatalyst, the ozone was highly decomposed in the presence of UV irradiation. Long time performances of the both catalysts were evaluated by a real-time ozone monitoring system during 120 hours. The results show that the UV irradiation enhanced the ozone conversion for the both catalysts.
유전체 배리어 방전형 2단 전기집진기의 인가전압 파형별 미세입자 집진특성
변정훈(Jeong?Hoon Byeon),박재홍(Jae?Hong Park),윤기영(Ki?Young Yoon),황정호(Jungho Hwang) 한국실내환경학회 2005 한국실내환경학회지 Vol.1 No.2
Dielectric barrier discharge (DBD) in air, which has been established for the production of large quantities of ozone, is more recently being applied to a wider range of aftertreatment processes for HAPs (hazardous air pollutants). Although DBD has high electron density and energy, its potential use as precharging nano and submicron sized particles, is not known. In this work, we measured VI (voltagecurrent) characteristics of DBD and estimated the collection efficiency of particles with bimodal distribution by DBD type 2stage ESP (electrostatic precipitator). To examine the particle collection with various applied voltage waveforms of DBD, nano size particles of NaCl (20∼100 ㎚) and DOS (50∼800 ㎚) were generated by an electrical tube furnace and an atomizer, respectively. Particle collection efficiencies of all the cases increased with increase of DBD electric power that the results corresponded to product of V by I whose magnitudes were the largest in triangular voltage waveform.
배리어 유전체 방전을 이용한 전기 집진부에서의 나노 입자 집진 효율
강석훈,지준호,변정훈,황정호,Kang, Suk-Hoon,Ji, Jun-Ho,Byeon, Jeong-Hoon,Hwang, Jung-Ho 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.11
Although dielectric barrier discharge (DBD) in air has been applied to a wider range of aftertreatment processes for HAPs (Hazardous Air Pollutants), due to its high electron density and energy, its potential use as precharging dust particles is not well known. In this work, we measured size distributions of bimodal aerosol particles and estimated collection efficiency of the particles by an electrostatic precipitator (ESP) using DBD as particle charger. To examine the particle collection with DBD charger, nano size particles of NaCl(20∼100nm) and DOS (50∼500nm) were generated by a tube furnace and an atomizer, respectively. For experimental conditions of 60㎐, 11㎸ and 60 lpm, the particle collection efficiency for the hybrid system was over 85%, based on the number of particles captured.
유전체 배리어 방전형 2단 전기집진기의 인가전압 파형별 나노 및 서브마이크론 입자 집진 특성
박재홍(Jae-Hong Park),변정훈(Jeong-Hoon Byeon),황정호(Jungho Hwang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Dielectric Barrier Discharge (DBD) in air, which has been established for the production of large quantities of ozone, is more recently being applied to a wider range of aftertreatment processes for HAPs (Hazardous Air Pollutants). Although DBD has high electron density and energy, its potential use as precharging nano and submicron particles are not well known. In this work, we measured I-V characteristics of DBD and estimated collection efficiency of the particles by DBD type 2-stage ESP. To examine the particle collection with various applied voltage waveforms of DBD for nano and submicron sized, bimodal particles were generated by a electrical tube furnace and an atomizer.