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흡수율과 재생율을 동시 고려한 천연가스복합발전 공정 연계 이산화탄소 포집 공정의 재생 조건 최적화
최정훈,주영환,Jeong Hun Choi,Young-Hwan Chu 한국화학공학회 2023 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.61 No.3
Natural Gas Combined Cycle(NGCC) recently receives lots of attention as an attractive form of power plants by virtue of its low carbon emission compared with coal-fired power plant. Nevertheless, it also needs carbon capture process since it is difficult to completely suppress carbon emission even for the NGCC. A simulation study has been performed to optimize operating condition of a carbon capture process using MEA considering low partial pressure of carbon dioxide in NGCC emission gas. For accurate optimization, overall process model including both NGCC and the carbon capture process has been built with a simulation software. Then, optimization in which various performance indices such as carbon dioxide absorption rate, solvent regeneration rate and power loss in the NGCC are simultaneously reflected has been done. Especially, it is noticeable that this study focuses on not only the amount of energy consumption but also the absorption and regeneration performance of carbon capture process. The best result considering all the performance indices has been achieved when the reboiler temperature is 120 ℃ and the reason has been analyzed.
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이관주,주영환,Lee, Kwan Ju,Chu, Young Hwan 한국전기화학회 2014 한국전기화학회지 Vol.17 No.2
바나듐 레독스 흐름 전지 (Vanadium redox flow battery, VRB) 시스템 운전 중 양이온 교환막을 통한 바나듐이온의 투과로 인하여 성능이 저하되는 문제점을 보완하기 위해 판상형태의 탄소물질인 산화그라핀 (Graphene Oxide, GO)을 기존에 사용하였던 양이온 교환막인 Nafion 양이온 교환막 표면에 열압착 방식으로 코팅하여 양이온 교환막 개선 및 VRB 성능 향상을 도모하였다. 개선된 양이온 교환막의 물리화학적 특성분석을 위하여 SEM (Scanning Electron Microscopy)분석, 이온 교환 용량, 수분 흡수 및 수소이온 전도도를 측정하였다. 산화그라핀층을 코팅한 결과, SEM 분석을 통해 양이온 교환막 표면에 약 $0.93{\mu}m$의 산화그라핀층이 형성된 것을 확인할 수 있었다. 산화그라핀을 코팅하여 개선된 양이온 교환막의 수소이온 전도도 측정 결과, 상용 양이온 교환막의 27% 수준으로 감소하였음을 확인하였으며, 동시에 바나듐이온 투과실험을 실시한 결과, 개선된 양이온 교환막의 바나듐이온 투과도가 기존 상용 양이온 교환막의 25% 이하 수준으로 감소하였음을 확인할 수 있었다. VRB 단위전지 성능실험을 실시하여 충-방전 특성을 분석한 결과, 산화그라핀을 코팅하여 개선된 양이온 교환막을 VRB 시스템에 적용하였을 경우, 바나듐이온의 투과도 감소로 인하여 쿨롱효율이 증가하였음을 확인할 수 있었고, 그로 인하여 전체적인 에너지효율이 상용막을 적용하였을 때 보다 증가하였음을 확인할 수 있었다. 따라서, 본 연구를 통해 양이온 교환막 표면에 판상형태의 탄소물질인 산화그라핀을 코팅하는 방법이 바나듐이온 투과도를 저하시키고 VRB의 시스템성능을 향상시킬 수 있는 효과적인 방법임을 제시할 수 있었다. Cation exchange membrane (Nafion) was modified to reduce the vanadium ion permeation through the membrane and to increase the vanadium redox flow battery (VRB) system performance by coating the graphene oxide (GO) which has nano-plate like morphology. Modified membrane properties were studied by measuring the ion exchange capacity (I.E.C), water uptake and proton conductivity. The thickness of the coated layer on the surface of the Nafion membrane was observed as $0.93{\mu}m$ by SEM. Proton conductivity and vanadium ion permeability of the modified membrane were decreased to 27% and 25% compared to that of the commercial Nafion membrane respectively. VRB single cell performance test was performed to compare the system performance of the VRB applied with commercial Nafion membrane and modified membrane. VRB system applied with modified membrane showed higher coulombic efficiency and energy efficiency than the VRB system applied with the commercial Nafion membrane due to the reduction of the vanadium ion permeation. From these result, we could suggest that the membrane modification by coating the GO on the surface of the Nafion membrane could be one of the promising strategies to reduce the vanadium ion permeation and to increase the VRB system performance effectively.
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Microbial CO₂ Electrobiorefinery as a Foremost Technology for Net-Zero Bio-Based Production in Korea
Soo Youn Lee(이수연),Sangmin Lee(이상민),Young-Hwan Chu(주영환),Hui Su Kim(김희수),Yu Rim Lee(이유림),Hwi Jong Jung(정휘종),Danbee Kim(김단비),Myunghoon Moon(문명훈),Gwon Woo Park(박권우) 한국신재생에너지학회 2023 한국신재생에너지학회 학술대회논문집 Vol.2023 No.6
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민경원,김현종,한명근,류태우,김목순,주영환,Min, Kyoung-Won,Kim, Hyun-Jong,Han, M.K.,U, Yu-Tae,Kim, Mok-Soon,Chu, Young-Hwan 한국전기화학회 2008 한국전기화학회지 Vol.11 No.4
본 연구에서는 백금의 입자크기가 내구성과 활성에 미치는 영향을 고찰하였다. 상용 Pt/C의 열처리를 통해 백금 입자 크기를 $3.5{\sim}9\;nm$로 조절하였고, XRD와 TEM을 통해 이를 확인하였다. 촉매의 내구성 분석을 위해 가속 실험을 실시하였고, 촉매 활성 측정을 위해 산소환원반응 실험을 하였다. 백금의 입자크기를 증가시킬수록 내구성은 향상되었으나 촉매의 활성이 저하되었다. 즉 촉매의 내구성과 활성은 반비례관계가 성립된다는 것을 확인하였다. 그리고 저하된 촉매 활성과 내구성을 향상시키기 위해, 합금 촉매를 사용하였다.상용 Pt/C의 최대 전력 밀도는 약 $507.6\;mV/cm^2$ 이고, PtCo/C 합금촉매는 $585.8\;mV/cm^2$이었다. 전기화학적 표면적은 상용 Pt/C는 약 60%정도 감소하였고, PtCo/C 합금촉매는 약 24%정도의 감소율을 나타냈다. 따라서 백금의 입자 크기 조절과 합금화를 통해 백금의 내구성과 활성을 동시에 높일 수 있었다. The influence of the particle size of platinum(Pt) on the stability and activity was studied. The particle size of platinum was controlled in the range of $3.5{\sim}9\;nm$ by heat treatment of commercial Pt/C and confirmed by XRD and TEM. An accelerated degradation test was performed to evaluate the stability of platinum catalysts. Oxygen reduction reaction was monitored for the measurement of activity. As increasing the Pt particle size, the stability of Pt/C electrode was enhanced and the activity was reduced. It was confirmed that the stability of Pt/C electrode was in inverse proportion to the activity. PtCo/C alloy catalyst was used to improve the activity and stability of large-sized platinum particle. The maximum power density of commercial Pt/C was $507.6\;mV/cm^2$ and PtCo/C alloy catalyst was $585.8\;mV/cm^2$. The decrement of electrochemical surface area showed Pt/C(60%) and PtCo/C alloy catalyst(24%). It was possible to enhance both of stability and activity of catalyst by the combination of particle size control and alloying.
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MFI형 제올라이트 분리막을 이용한 에틸벤젠/파라자일렌 분리에 대한 연구
이기천 ( Gi Cheon Lee ),전유권 ( Yu Kwon Jeon ),주영환 ( Young Hwan Chu ),최성환 ( Seong Hwan Choi ),서영종 ( Young Jong Seo ),설용건 ( Yong Gun Shul ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.4
Ethylbenzene (EB) which has a similar physical properties with p-xylene (pX) was separated from EB/pX mixture by using MFI-type zeolite (TS-1, ZSM-5, and Silicalite-1) coated membranes. The zeolites were synthesized by microwave method to reduce the synthesis time and uniformly formed zeolite particles were coated on the α-almina tubular support with a thickness of 3-4 μm. Separation factor and permeation flux of the synthesized zeolite coated membranes were measured to survey the best performance of ethylbenzene separation from different composition of EB/pX mixtures. When the EB/pX mixture of 5:5 molar ratio applied for the separation experiment, it represented the highest separation factor. We also have studied about the effect of the atomic composition of zeolites on the separation performance within the temperature range from 160 to 220℃. TS-1 showed the highest permeation flux of 1,666 mol/㎡*s*Pa and Silicate-1 showed the highest separation factor of 1.73 at 200℃ respectively.
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연료전지 전극막 제조를 위한 백금나노입자의 기체확산층 직접 전기증착에 관한 연구
김현종 ( Hyun Jong Kim ),안지은 ( Ji Eun Ahn ),손성호 ( Seong Ho Son ),이홍기 ( Hong Kee Lee ),한명근 ( M. K. Han ),이관주 ( Kwan Ju Lee ),주영환 ( Young Hwan Chu ) 한국공업화학회 2010 응용화학 Vol.14 No.2
The pulse electro-deposition processes created the nanostructured Pt cluster directly on the surface of gas diffusion layer (GDL). By localizing platinum on the surface of a gas diffusion layer (GDL), it is possible to decrease the thickness of the catalyst layer and increase the efficiency of platinum usage. The Pt cluster was well dispersed in GDL and composed of Pt nanosheet. The growth mechanism was carefully monitored. By increasing the current density for pulse electrodeposition, the size of Pt cluster was decreased, result in the enhancement of ESA.
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