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양세일 ( Se Il Yang ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.1
There is growing interest in hydrogen as a transportation fuel in Korea. Plans are underway to construct a “Hydrogen Highway” network of stations across the state to stimulate fuel cell vehicle deployment. One of the key challenges in the planning and financing of this network is determining the costs of the stations. The purpose of this thesis is to examine the cost of building stations and answer the fundamental question, ‘how much would new hydrogen stations cost now?’ The costs for station are analyzed with respect to size, siting factors, and operating factors. Based on these cost analyses, 1) Existing hydrogen station cost analyses tend to under-estimate true station costs by assuming high production volume levels for equipment, neglecting station installation costs, and omitting important station operating costs. 2) Station utilization (i.e. capacity factor) has the most significant impact on hydrogen price.
SPEEK-Ag+ 촉진수송막 모듈을 이용한 C5유분의 분리
양세일 ( Se Il Yang ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.3
Recently, facilitated olefin transport membranes are attracting increasing interest as promising alternatives to the conventional distillation processes, and significant advances have been already made in the separation of propylene from propane mixtures. Being motivated by the successful operation of the membrane processes, in this study, separating isoprene from C5 raffinates by facilitated transport membrane concepts.
4탑 PSA 공정의 의한 SMR off-gas로부터 수소 정제
양세일(Yang, Se-Il),박주용(Park, Ju-Yong),장성철(Jang, Seong-Cheol),김성현(Kim, Sung-Hyun),최대기(Choi, Dae-Ki) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
The four-bed PSA process using a layered bed of activated carbon and zeolite 5A was studied to produce a high purity hydrogen product from SMR off-gas. At a desired product purity (99.999%+), the recovery increased with decreasing the linear velocity. However, the difference of the increasing of the recovery became smaller with the decreasing of the linear velocity and then was similar from below the linear velocity 3.9 cm/s. When the adsorbents, the feed gas composition, and the operating conditions are given, the residence time is mainly a function for design of the PSA bed size. The minimum residence time exists to obtain the maximum recovery at desired product purity.
양세일(Yang, Se-Il),안의섭(Ahn, Eui-Sub),장성철(Jang, Seong-Cheol),최도영(Choi, Do-Young),최대기(Choi, Dae-Ki) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
Hydrogen separation from multi-component mixture gases by the four-bed PSA process was studied experimentally and theoretically using layered bed of activated carbon and zeolited 5A. Effects of the adsorption time, the linear velocity on the process performance were investigated. The adsorption time and linear velocity affected the purity and recovery of the product H₂ purity is increases according as the adsorption time and linear velocity decrease; however, H₂ recovery shows an opposite phenomena to the purity. PSA process simulation studied to find optimum operation condition. In the results, 50sec adsorption time, 3cm/s linear velocity might be optimal values to obtain more than 99.999% purity and 65% recovery hydrogen.
박주용,양세일,최도영,장성철,이창하,최대기,Park, Ju-Yong,Yang, Se-Il,Choi, Do-Young,Jang, Seong-Cheol,Lee, Chang-Ha,Choi, Dae-Ki 한국화학공학회 2008 Korean Chemical Engineering Research(HWAHAK KONGHA Vol. No.
The dynamic characteristics of adsorption using an adsorption bed packed with Li-X zeolite (UOP) were studied through the breakthrough experiments of $H_2/CH_4$ (90:10 vol%), $H_2/CO$ (90:10 vol%) and $H_2/CO_2$ (80:20 vol%) mixtures. Effects of feed flow rate (6.24~10.24 LPM) and adsorption pressure (6.1 bar~10.1 bar) in the Li-X zeolite bed with 2.7 cm of inside diameter and 80 cm of bed length were observed. The smaller feed rate or the higher operating pressure, resulted in the longer of the breakthrough time and the breakthrough curve have tailing due to temperature variance in the bed. The adsorption dynamics of the Li-X zeolite bed were predicted by using LDF model with feed flow and pressure dependent diffusivity. The prediction and experimental data were analyzed with a nonisothermal, nonadiabatic model, dual-site langmuir (DSL) isotherm Li-X 제올라이트 흡착탑에서의 $H_2/CO_2$(80:20 vol%), $H_2/CO$(90:10 vol%), $H_2/CH_4$(90:10 vol%)의 이성분계 기체의 흡착 동특성을 연구하였다. 각 계에서 공급유속(6.24~10.24 LPM), 흡착압력(6.1~10.1 bar)에 대한 영향을 살펴보았다. 동특성 실험 결과 파과시간은 공급유속이 적을수록, 흡착압력이 높을수록 증가하였으며 탑 내부 온도의 영향으로 tailing 현상이 발생하였다. Li-X 제올라이트 흡착탑에서 공급 유량과 압력의 확산계수에 의한 LDF식을 사용하여 예측하였다. 본 연구에서는 비등온과 비단열상태, Dual-site langmuir 등온식과 고려하여 해석하였으며 실험 데이터와 비교하였다.