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External Gelation 방법을 이용한 구형 UO<sub>3</sub> Gel 입자 제조
정경채,김연구,오승철,조문성,이영우,장종화,Jeong, KyungChai,Kim, YeonKu,Oh, SeungChul,Cho, Moon-Sung,Lee, YoungWoo,Chang, JongWha 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.11
HTGR (High Temperature Gas-cooled Reactor) is spotlighted to next generation nuclear power plant for producing the clean hydrogen gas and the electricity. In this study, the spherical $UO_3$ gel particles were prepared by the external gelation process, and the characteristics of these particles were analyzed the particle shape, composition of precipitate, and thermal decomposition characteristics with the Streoscope, FT-IR, and X-ray diffractometer. Raw material of the ADUN (Acid Deficient Uranyl Nitrate) solution, which has [$NO_3$]/[U] mole ratio = 1.75, was obtained from dissolution of the $U_{3}O_{8}$ powder with concentrated $HNO_3$, and its concentration is 3.5 M-U/l. The broth solution is prepared with the ADUN, urea, PVA, and THFA solution. The droplets of the broth solution was made through a nozzle system. From this study, we obtained the following results; 1) an externel chemical gelation process is a suitable method in the spherical $UO_3$ particle production, 2) the particle shape are changed by an urea mixing time, THFA volume, and the viscosity of the broth solution, 3) the amorphous $UO_3$ particles obtained from these experiments was converted to $U_{3}O_{8}$ and then $UO_2$ by heat treatment in hydrogen atmosphere at $600^{\circ}C$.
고온수증기전기분해장치 (HTSE)의 수소 생산 특성에 관한 수치적 연구
최재혁(Jae-Hyuk Choi),김준섭(Jun Sub Kim),신영준(Youngjoon Shin),이기영(Ki-Young Lee),장종화(Jongwha Chang),함영민(Yeong Min Hahm) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
The characteristics of hydrogen production in high temperature steam electrolysis (HTSE) have been numerically analyzed in a two-dimension with the Comsol multiphysics. The main parameters for the calculation are appllied voltage and ASR (Area Specific Resistance). The results showed that thermal neutral voltage was 1.2454 V and a mean temperature in cell was decreased by less than 1.2454 V and it was increased by more than 1.2454 V. This means that the mean temperature in cell is not increase monotonously with increasing the applied voltage. The mean temperature and the rate of hydrogen production in cell were decreased with increase in ASR.
고온수증기전기분해장치(HTSE)의 수소 생산 특성에 관한 수치적 연구
최재혁(Jae-Hyuk Choi),김준섭(Jun Sub Kim),신영준(Youngjoon Shin),이기영(Ki-Young Lee),장종화(Jongwha Chang),함영민(Yeong Min Hahm) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
The characteristics of hydrogen production in high temperature steam electrolysis (HTSE) have been numerically analyzed in a two-dimension with the Comsol multiphysics. The main parameters for the calculation are appllied voltage and ASR (Area Specific Resistance). The results showed that thermal neutral voltage was 1.2454 V and a mean temperature in cell was decreased by less than 1.2454 V and it was increased by more than 1.2454 V. This means that the mean temperature in cell is not increase monotonously with increasing the applied voltage. The mean temperature and the rate of hydrogen production in cell were decreased with increase in ASR.
황-요오드 공정용 직접접촉 삼산화황 분해반응기내 열전달 특성에 관한 수치적 연구
최재혁(Jae-Hyuk Choi),신영준(Young-Joon Shin),탁남일(Nam-Il Tak),이기영(Ki-Young Lee),장종화(Jongwha Chang),정석호(Suk-Ho Chung) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
A directly heated SO₃ decomposer for the sulfur-iodine and hybrid-sulfur processes has been introduced and analyzed by using a computational fluid dynamics code(CFD) with the CFX 5.7.1. The use of a directly heated decomposition reactor in conjunction with a VHTR allows higher decomposition reactor operating temperature. However, the thermochemical and hybrid hydrogen production processes accompanied with the high temperature and strongly corrosive operating conditions basically have material problems. In order to resolve these problems, we carried out the development of a structural material and equipment design technologies. The results show that the maximum temperature of the structural material (RA330) could be maintained at 800℃ or less. Also, it can be seen that the mean temperature of the reaction region packed with catalysts in the SO₃ decomposition reactor could satisfy the temperature condition of around 850 ℃ which is the target temperature in this study.