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바이오가스 내 황화합물 및 실록산 제거를 위한 상용 흡착제의 흡착 특성
임찬종(Chan-Jong Lim),박철우(Chul-U Bak),김우승(Woo-Seung Kim),김영득(Young-Deuk Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this study, bench-scale adsorption experiments have been conducted to investigate the adsorption characteristics of commercially-available adsorbents for the removal of impurities from biogas. The physicochemical properties of adsorbents are first characterized using SEM, XRF and BET analyses followed by the adsorption characteristics analysis of sulfur compounds and siloxanes in adsorbents considered in the present work. It is found that the IHS adsorbent, composing of 85% iron oxide-hydroxide and 5% silica gel, has the best adsorption capacity of hydrogen sulfide, in which its adsorption capacity is almost six times higher than that of iron oxide adsorbent. The IHS has also the highest adsorption capacity for carbonyl sulfide. The best removal efficiency of carbon disulfide has been achieved by both activated carbon and impregnated activated carbon among all of the adsorbents tested. In cases of siloxanes D<SUB>4</SUB> and D<SUB>5</SUB>, the silica gel (A2) shows an extremely high adsorption capacity.
바이오가스 내 메탄 정제를 위한 폴리술폰 중공사막의 성능 평가
임연규(Yeon-Gyu Lim),박철우(Chul-U Bak),이주협(Ju-Hyeop Lee),김영득(Young-Deuk Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In this study, the separation characteristics of a polysulfone hollow fiber membrane for the removal of carbon dioxide and sulfur compounds from biogas were analyzed using a bench-scale experimental set-up. The permeance of each component was analyzed using binary mixtures (CH₄/N₂, CO₂/N₂, and CH₄/CO₂). The effects of stage cut and feed pressure on the recovery rate and purity of methane and the removal rate of each impurity were then investigated using a methane-rich mixture that simulates biogas (30% CO₂, 1900 ppm H₂S, 100 ppm COS and 100 ppm CS₂). As the stage cut increased, the CH₄ purity increased while its recovery rate decreased. Meanwhile, the removal efficiency of sulfur compounds was improved with increasing stage cut. It was also found that a higher feed pressure led to an improvement in the removal efficiency of sulfur compounds. In addition, a theoretical model was developed, and model predictions and experimental data were shown to be in good agreement.
중공사막을 이용한 가스분리 공정의 성능예측을 위한 수학적 모델 개발
임연규(Yeon-Gyu Lim),박철우(Chul-U Bak),김영득(Young-Deuk Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
In this study, a rigorous mathematical model was developed to predict the separation performance of multi-component gases in gas separation processes using hollow fiber membranes. A mathematical model consisting of the mass, momentum, and species balance equations for both bulk flows was developed with consideration of mass transfer across the membrane and the concentration boundary layer adjacent to the membrane. The mathematical model was validated by comparing the experimental data obtained from methane purification with polysulfone. The simulation results were in good agreement with the experimental data, with a relative error of less than 5%.
VOCs 정제를 위한 제올라이트 분리막 기반 증기투과 공정의 탈수 성능평가
김지웅(Ji-Woong Kim),임연규(Yeon-Gyu Lim),박철우(Chul-U Bak),김영득(Young-Deuk Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
In this study, we analyzed the dehydration performance of a vapor permeation process using NaA zeolite membranes for the purification of volatile organic compounds. The experiments were performed using a binary mixture (i.e., 70 wt.% isopropyl alcohol (IPA), 30 wt.% water) with shell and tube type modules in a co-current flow configuration (i.e., feed at the shell side and permeate at the lumen side). The effects of feed flow rate and permeate pressure on separation performance were evaluated under various operating conditions. As the feed flow rate increased, the IPA purity at the retentate side decreased, while the IPA recovery rate increased. Meanwhile, decreasing the permeate pressure increased the purity of IPA and decreased the recovery rate of IPA.