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정종헌(Chong-Hun Jung),원휘준(Hui-Jun Won),김선병(Seon-Byeong Kim) 한국열환경공학회 2019 한국열환경공학회 학술대회지 Vol.2019 No.춘계
고방사성 물질을 취급하는 시설은 허용된 방사성 준위를 유지해야하고 시설의 개·보수나 해체 시 작업자의 피폭저감을 위해서는 시설의 방사성 오염물질을 제거하는 제염공정이 필요하다. 이들 제염공정 중에서 화학제 등을 사용하는 습식제염공정은 제염 효과는 우수하지만 제염후 폐액이 발생하므로써 폐액과 관련된 화학적 처리공정이 필요하다. 이에 반해 물리적 방법에 의한 건식제염 공정은 폐액이 발생하지 않으므로 이와 관련한 추가 폐액처리가 불필요한 반면 제거된 미세 건식폐기물이 주변으로 비산함으로써 재오염 문제와 제염효과가 저하되는 문제가 있다. 따라서 비산으로 인한 오염확산을 억제하기 위해서는 제염과 동시에 여과매체에 의한 제염으로 제거된 미세 입자의 효과적 수거가 필요하다. 이와 관련하여 고방사능 건식제염 시 발생되는 나노크기의 미세입자를 효과적으로 포집할 수 있는 여과체에 의한 사전 포집특성을 조사하였다. 나노크기의 NaCl 분산체(0.2 M NaCl 수용액을 분무발생기에 채워 NaCl 액적을 분무 발생시킨 후 확산건조기를 거쳐 입자만 공급)를 HEPA filter(여지:PALL Model type A/E)에 통과시켜 포집 전후의 입자 수 농도를 UCPC(TSI model 3025A)와 electrostatic classifier(TSI model 3080)로 구성된 SMPS로 측정하여 포집효율을 평가하였다. 실험 결과, 약 110 nm 입자크기에서 포집효율이 약 97%로 가장 낮게 나타남을 알 수 있었다. 이는 입자크기에 따라 확산, 차단 및 관성충돌의 포집 메카니즘이 다른데 기인하여 주어진 필터와 면속도에서 최저 포집효율을 나타내는 입자크기와 면속도가 존재하기 때문이다. 큰 입경의 입자에 대한 포집효율 값이 변동이 있는 것은 NaCl 나노 입자의 낮은 농도에 기인한 것으로 보인다.
활성탄소섬유에 의한 폐액 중 Chromium(6) 의 흡착
정종헌(Chong Hun Jung),정현희(Hyun Hee Jung),문제권(Jei Kwon Moon),오원진(Won Zin Oh),유승곤(Seung Kon Ryu) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.4
The adsorption of Cr(VI) on activated carbon fibers(ACFs) in liquid waste has been studied. The prepared ACFs with highly microporous structure were found to have acidic functional group on the surfaces, which affected greately the adsorption of Cr(VI) ions. The adsorption rates of Cr(VI) on the ACFs were very fast and the reactions reached equilibrium within 1 hr. The ACFs could remove 98 % of Cr(VI) from aqueous solution of 0.75×10^(-3)-10^(-2) molar concentration. During the adsorption of Cr(VI), the solution pH was also changed from 3.0 at the beginning up to 8.5 at equilibrium. This pH change caused the Cr(VI) ions to change into Cr(III) ions, which affected the adsorption characteristics of ACFs.
채주승,고경렬,정종헌,이보성,유승곤 ( Joo Seung Chae,Kyung Ryeol Ko,Chong Hun Jung,Bo - Sung Rhee,Seung Kon Ryu ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.1
Hollow carbon fiber was prepared from petroleum pitch and activated by steam for the production of new type adsorbent. The hollow activated carbon fibers (HACF) showed 800-2100 ㎡/g of specific surface area. All the adsorption isotherms of HACFs were Type I. The external surface area of 70% burn-off HACF was only about 1.5% of total surface area, which means that the micropore volume is very large. HACFs have excellent iodine adsorption and methylene blue decolorization capacities like an ordinary activated carbon fibers in solution. Especially, it is expected that HACF can be used for the separation of various mixtures as molecular sieves.
정관성,이동규,정종헌,이근우,Jeong, Kwan-Seong,Lee, Dong-Gyu,Jung, Chong-Hun,Lee, Kune-Woo 한국방사성폐기물학회 2006 방사성폐기물학회지 Vol.4 No.4
The estimated decommissioning cost of nuclear research reactor is calculated by applying a unit cost factor-based engineering cost calculation method on which classification of decommissioning works fitted with the features and specifications of decommissioning objects and establishment of composition factors are based. Decommissioning cost of nuclear research reactor is composed of labor cost, equipment and materials cost. Labor cost of decommissioning costs in decommissioning works are calculated on the basis of working time consumed in decommissioning objects. In this paper, the unit cost factors and work difficulty factors which are needed to calculate the labor cost in estimating decommissioning cost of nuclear research reactor are derived and figured out.
김계홍,박찬희,이근우,정종헌,서범경,Kim, Gye-Hong,Park, Chan-Hee,Lee, Kune-Woo,Jung, Chong-Hun,Seo, Bum-Kyoung 한국방사성폐기물학회 2008 방사성폐기물학회지 Vol.6 No.2
The new type phoswich detector consisting of the ZnS(Ag) and plastic scintillator for alpha/beta-ray simultaneous counting was developed for monitoring radiological contamination inside pipes. The detection performance was estimated using the PSD (pulse shape discrimination) method as a function of distance between the scintillator and radioactive source. The attenuation of particles traveling through a thin film for preventing the detector from being contaminated was experimentally estimated. It is concluded from our investigation that the phoswich detector developed can provide a sufficient alpha/beta-ray discrimination. The application of a thin film for preventing the detector from being contaminated was proven to be feasible.
PFC제염폐액 내의 미립자 제거를 위한 여과막의 특성 연구
김계남,이성열,원휘준,정종헌,오원진,박진호,Kim Gye-Nam,Lee Sung-Yeol,Won Hui-Jun,Jung Chong-Hun,Oh Won-Zin,Park Jin-Ho 한국방사성폐기물학회 2005 방사성폐기물학회지 Vol.3 No.2
PFC(Perfluorocarbon) decontamination process is one of best methods to remove hot particulate adhered at inside surface of hot cell and surface of equipment in hot cell. It was necessary to develop a particulate filtration equipment to reuse PFC solution used on PFC decontamination due to its high cost and to minimize the volume of second wastewater. Contamination characteristics of hot particulate were investigated and then a filtration process was presented to remove hot particulate in PFC solution generated through PFC decontamination process. The removal efficiency of PVDF(Poly vinylidene fluoride), PP(Polypropylene), Ceramic(Al$_{2}$O$_{3}$ filter showed more than 95$\%$. The removal efficiency of PVDF filter was a little lower than those of other kiters at same pressure(3psi). A ceramic filter showed a higher removal efficiency with other filters, while a little lower flux rate than other filters. Due to inorganic composition, a ceramic filter was highly stable against radio nuclides in comparison with PVDF and PP membrane, which generate H$_{2}$ gas in e-radioactivity atmosphere. Therefore, the adoption of ceramic filter is estimated to be suitable for the real nitration process.
PFC 제염 시 발생된 PFC 폐액의 재사용을 위한 여과장치 개발 및 성능평가
김계남,정철진,원휘준,최왕규,정종헌,오원진,박진호,Kim Gye-Nam,Jeong Cheol-Jin,Won Hui-Jun,Choi Wang-Kyu,Jung Chong-Hun,Oh Won-Zin,Park Jin-Ho 한국방사성폐기물학회 2006 방사성폐기물학회지 Vol.4 No.2
PFC(Perfluorocarbon) decontamination process is one of best methods to remove hot particulate adhered on the inner surface of hot cell and surface of equipment in hot cell. It was necessary to develop a filtration equipment to reuse the PFC waste solution generated on PFC decontamination due to the high cost of PFC solution and for minimization of the volume of second waste solution. The filtration equipment was developed to remove hot particulate in PFC waste solution. It was made suitable size and weight in consideration of hot cell gate and crane. And it has wheels for easy movement. Flux of the filtration equipment decreased with particulate concentration increase. It consists of pre-filter($1.4{\mu}m$) and final-filter($0.2{\mu}m$) for protection of the flux decrease along filtration time. It treatment capacity of waste solution is 0.2 L/min.