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Non-thermal Plasma Process for simultaneous removal of SO₂/NOx from a Sintering Plant of Steel Works
남창모(Chang-Mo Nam),목영선(Young-Sun Mok),권기홍(Gi-Hong Kwon),서유덕(You-Duck Suh),조병락(Byeung-Rak Cho) 한국산업융합학회 2003 한국산업융합학회 논문집 Vol.6 No.1
For the simultaneous removal of SO₂/NOx from an iron-ore sintering plant, industrial plasma experiments have been conducted with a flue gas flow rate of 5,000 Nm³/hr. The maximum 40kW power using the magnetic pulse compression (MPC) system generates a peak value of 100-150kV pulse voltage with its risetime of 200nsec and full width at half maximum (FWHM) of 500nsec, and with a frequency <300Hz. The plasma reactor module adopts a wire-plate structure with a gap of 200-400mm ID between plates. Initial concentrations of SO₂and NOx were around 100-150ppm, respectively in the presence of 15% O₂ and <10% H₂O. Various reaction parameters such as specific energy (Whr/Nm³), NH₃ injection with corona discharge, flow rate and injection of hydrocarbons were investigated for SO₂/NOx removal characteristics. About 90/65% of SO₂/NOx were simultaneously removed with a specific energy of 3.0 Whr/Nm³ when both NH₃and hydrocarbons were injected. Practical implications that the pilot-scale plasma results provide are further discussed.
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.
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.
염류집적 농경지 제염기술에 대한 경제성분석 - 작물생산량을 기준으로
김도형,최정희,김이열,남창모,백기태,Kim, Do-Hyung,Choi, Jeong-Hee,Kim, Lee-Yul,Nam, Chang-Mo,Baek, Ki-Tae 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.5
In this study, economic analysis of five desalination technologies for saline agricultural land was carried out. The analysis was comprehensively evaluated by calculating changes in crop production and benefit/cost (B/C) ratio. The analysis of crop production was in the order of tomato > cucumber > a (musk) melon > watermelon > cabbage, and economical efficiency for desalination technology was in the order of soil exchange > soil addition > electrokinetics > under-drainage > subsoil reversal. In cost benefit analysis, B/C ratio was in the order of under-drainage > soil exchange > electrokinetics > soil addition > subsoil reversal, and all desalination technologies used in this study have the ratio higher than 1, which means economical efficiency was high. Based on the net production considering B/C ratio, the general economic analysis was exactly order from that of crop production analysis. As a result, economical efficiency of soil exchange was highest, and economical efficiency of soil addition and electrokinetic was relatively higher than others.
권기홍(Gi-Hong Kwon),남창모(Chang-Mo Nam),김동원(Dong-Won Kim),성병주(Byung-Joo Sung) 한국환경관리학회 2008 環境管理學會誌 Vol.14 No.3
전자산업에서 발생되는 유해 폐산의 재활용은 환원ㆍ산화, 정제, 여과 과정을 거쳐 환원공정에서는 구리를, 최종공정에서는 염화제이철(FeCl₃) 을 회수하고 있으나, 환원과정에서 얻어진 구리의 경우 순도가 낮아 제 가격을 받지 못하고 있는 실정이다. 따라서 본 연구는 폐산의 재활용공정 중 환원과정에서 얻어진 구리의 회수율 증대를 위한 연구를 수행한 결과 다음과 같은 결론을 얻었다. 구리 회수율 중대를 위한 방법으로 수세척을 이용하고 세척회수 2회, 구리 slurry와 세척액량의 비 30 : 100, 세척 및 침전시간 각각 30분, 세척조 하부 blowing하는 조건으로 운전한 결과 구리 순도율(수분 포함)은 세척 전에는 평균 62.8%였으나 세척 후에는 평균 80.4%로 약 18%의 순도가 향상된 것으로 확인할 수 있었으며, 세척과정에서 발생된 세척액의 성분분석 결과 농도는 낮지만 Cr, Pb 등의 중금속물질이 포함되어 있어 적정한 처리가 필요할 것으로 판단된다. 결론적으로 기존의 공정에서 세척 회수, 구리 slurry와 세척액량의 비, 세척 및 침전 시간의 적절한 조합으로 충분히 회수율을 높일 수 있음을 확인하였다. Hazardous acid wastewater generated at electronic industries can be recycled and reused after going through the procedures of reduction, oxidization, purification and filtration, Then, the Cu can be recovered in the reduction process and the iron chloride (FeCl₃) in the final process, respectively. Because the recovered Cu has a very low degree of purity, however, its fair and reasonable price can not be established. This study was performed to improve the recovery of Cu in the reduction process during the recycling and reuse of acid wastewater. The result of this study is summarized as follows. Water washing was used as a method to improve the Cu recovery with the following conditions: Twice washing recovery, the ratio of Cu slurry to washing solution: 30:100, washing and precipitation time: each 30 minutes, and blowing under the washing bath. Then, it was shown that the average purity degree of recovered Cu(including water) accounted for 62.7% before washing, and 80.4% after washing. There was the increase of approximately 18% in the Cu purity. When chemicals of washing solution were analysed after washing, the findings showed that such heavy metals as Cr and Pb were contained in very low concentration. It seems that they have to be treated in a proper way. In conclusion, the finding showed that it should be possible to improve the recovery by properly combining the existing procedure with these conditions: Washing times, ratio of Cu slurry to washing solution, washing and precipitation time.
추수태(Soo-Tae Choo),남창모(Chang Mo Nam) 한국산업융합학회 2004 한국산업융합학회 논문집 Vol.7 No.3
Emissions of volatile organic compounds and odors from various industrial processes not only pollute surrounding life environments, but also lead to the deterioration of the working environments, causing various industrial health and business problems. These pollutants are usually stimulating, irritating, malodorous and sometimes carcinogenic, Which should be reduced in the pollutants formation, stage, but the practical processes do not allow The paper describes the major sources of VOC and odors, and their sampling/analysis methods. Furtbermore, various removal technologies for these pollutants are suggested, which particularly include the characteristics of the catalytic and scrubber/carbon filter combined process, and even process design technologies<br/>