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소형 용융탄산염 연료전지 스택의 운전 특성 1 : 100w 급 십자흐름형 스택의 운전 특성
남석우,임태훈,오인환,이갑수,윤성필,홍성안,임희천,이창우,선양국 ( Suk Woo Nam,Tae Hoon Lim,In Hwan Oh,Kab Soo Lee,Seong Pil Yoon,Seong Ahn Hong,Hee Chun Lim,Chang Woo Lee,Yang Kook Sun ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.5
A 100W-class stack consisting of ten molten carbonate fuel cells has been fabricated and tested to establish the basic technology for an internally manifolded stack. Each cell in the stack had an effective electrode area of 100 ㎠, and reactant gases were distributed in each cell in a cross-flow configuration. Performance of the stack was investigated as a function of gas utilization, gas composition and temperature using a specially designed stack test apparatus. It was possible to have a stack with an output of more than 100W using an anode gas of 72%H₂/18%CO₂/10%H₂O and a cathode gas of 33%O₂/67%CO₂. The open circuit voltage of the stack was 11.2V and the voltage at a current density of 150 ㎃/㎠ and gas utilization of 0.4 was 7.3V. The voltage loss due to the internal resistance and the electrode polarization, however, was higher than that of a single cell, and the distribution of cell voltages was not uniform indicating that differences in stacking and operating environment of each cell have to be minimized to enhance the cell performance and uniformity. Since the performance degradation of the stack during the continuous operation at 150 ㎃/㎠ was higher than that of the single cell, further works are required to enhance the life of the stack.
소형 용융탄산염 연료전지 스택의 운전 특성 2 : 200W 급 같은방향흐름형 스택의 운전 특성
남석우,이갑수,임태훈,오인환,홍성안,임희천,강인준 ( Suk Woo Nam,Kab Soo Lee,Tae Hoon Lim,In Hwan Oh,Seong Ahn Hong,Hee Chun Lim,In Jun Kang ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.5
A 200W-class stack consisting of twenty molten carbonate fuel cells has been fabricated and tested to establish the basic technology for an internally manifolded stack. Each cell in the stack had an effective electrode area of 100 ㎠ and reactant gases were distributed in each cell in a co-flow configuration. The stack showed state-of-the-art performance; the stack voltage at a current density of 150 ㎃/㎠ and gas utilization of 0.4 was 16.9 V producing an output of more than 250W using an anode gas of 72%H₂/18%CO₂/10%H₂O and a cathode gas of 70%air/3%CO₂. Compared with the performance of the previously-tested stack, the voltage lass due to the internal resistance and the electrode polarization became lower and the distribution of cell voltages became more uniform indicating that some improvements were made in component fabrication and cell stacking technology. The voltage of the stack, however, decayed during the continuous operation at 150㎃/㎠ and further works are required to enhance the life of the stack.
유기금속 화학증착법으로 제조한 실리카 - 타이타니아 복합막의 기체분리 특성 연구
하흥용,남석우,홍성안 ( Heung Yong Ha,Suk Woo Nam,Seong Ahn Hong ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.5
Thin films of TiO₂, SiO₂ and TiO₂/SiO₂ were deposited on the inner surface of the porous glass support tubes by the decomposition of tetraisopropyl titanate(TIPT) and tetraethyl orthosilicate(TEOS) at an atmospheric pressure. The hydrogen selectivities of the membranes were increased by the deposition of thin films of metal oxides. Deposition rate of the films and gas(H₂ or N₂) permeation properties of the membranes were much different from one another depending on the types of thin films and deposition conditions such as temperature and TIPT/TEOS ratio in the feed stream. The pure TiO₂ films which were deposited only in the temperature range between 230 and 300℃ were found to have some hydrogen selectivities. In comparison to the pure TiO₂, films, stable SiO₂ films were formed at temperatures as high as 600℃, and they showed very high hydrogen selectivities larger than 500 though their deposition rates were much slower than those of the TiO₂, films. On the other hand, composite TiO₂/SiO₂ films could he also formed at temperatures as high as 600℃ and they showed excellent hydrogen selectivities which were comparable to those of the pure SiO₂ films. And the deposition rates of TiO₂/SiO₂ films were much faster than those of the pure SiO₂ films. Gas permeation rates through the porous support decreased with increasing temperature, suggesting an Knudsen diffusion mechanism, but the film-coated membranes showed an activated diffusion process by which gas permeation rates through the membranes increased with an increase in temperature.
홍성안,남석우 ( Seong Ahn Hong,Suk Woo Nam ) 한국공업화학회 1992 공업화학 Vol.3 No.4
The molten carbonate fuel cell(MCFC) has been under intensive development for the last decade as a second generation fuel cell. The advantages of the MCFC over the phophoric acid fuel cell are higher efficiency, its ability to accept CO and H₂ as a fuel, lower material costs, and high operating temperature making internal reforming possible. These features, along with low atmospheric emissions, will open up a significant market as an attractive means of developing highly efficient power plant. This article reviews a status of the MCFC research and development, a principle of the MCFC, and cell and stack technology including the status of electrodes, matrices and electrolytes. Several technical difficulties which must be resolved to be commercialized are mainly focused.
윤성필,한종희,남석우,임태훈,홍성안,현상훈,유영성,Yoon Sung Pil,Han Jonghee,Nam Suk Woo,Lim Tae-Hoon,Hong Seong-Ahn,Hyun Sang-Hoon,Yoo Young-Sung 한국전기화학회 2001 한국전기화학회지 Vol.4 No.2
기체/전해질/LSM $(La_{0.85}Sr_{0.15}MnO_3)$ 공기극이 만나는 삼상계면 (triple phase boundary) 주위에 YSZ ($8mol\%$ yttria stabilized zirconia) 코팅막 (coating film) 을 형성하여 추가로 삼상계면을 크게 늘린 새로운 전극 미세구조를 갖는 복합 공기극 (composite cathode) 을 개발하였다. 이 복합 공기극을 전해질 두께가 약 $30{\mu}m$인 연료극 (anode)v 지지체 위에 형성하여 $700\~800{\circ}C$의 온도에서 전류전압 특성 및 교류 임피던스 분석을 실시하였다. $800^{\circ}$, 공기 및 수소 조건에서 교류 임피던스 분석 결과 1000Hz주파수 영역을 대변하는 저항성분 R1은 연료극 분극 저항에 해당하였고 100Hz주파수 영역의 저항성분 R2는 공기극 분극 저항 성분, 그리고 10Hz이하 영역의 저항성분 R3는 전극을 통한 기체확산 저항성분으로 특히, 작동 조건인 공기 및 수소 분위기에서는 연료극 쪽 반응기체에 의한 기체확산 저항 성분임을 알 수 있었다. 전지성능 측정 결과 이 복합 공기극을 장착한 전지는 $800^{\circ}C$, 공기 및 산소 조건에서 각각 $0.55W/cm^2$ $1W/cm^2$의 높은 전지성능을 나타내었다. 전류전압 곡선은 기울기가 다른 두 구간으로 구분되었으며, 낮은 전류밀도 하에서 보이는 급격한 전압감소 구간은 공기극 분극저항이 주된 성능 저하의 원인인 반면, 높은 전류밀도 하에서 나타나는 완만한 전압 감소 구간은 전해질에 관련된 분극저항이 주된 성능 저하의 원인이었다. YSZ ($8mol\%$ yttria-stabilized zirconia)-modified LSM $(La_{0.85}Sr_{0.15}MnO_3)$ composite cathodes were fabricated by formation of YSZ film on triple phase boundary (TPB) of LSM/YSZ/gas. The YSZ coating film greatly enlarged electrochemical reaction sites from the increase of additional TPB. The composite cathode was formed on thin YSZ electrolyte (about 30 Um thickness) supported on an anode and then I-V characterization and AC impedance analyses were performed at temperature between $700^{\circ}C\;and\;800^{\circ}C$. As results of the impedance analysis on the cell at $800^{\circ}C$ with humidified hydrogen as the fuel and air as the oxidant, R1 around the frequency of 1000 Hz represents the anode Polarization. R2 around the frequency of 100Hz indicates the cathode polarization, and R3 below the frequency of 10 Hz is the resistance of gas phase diffusion through the anode. The cell with the composite cathode produced power density of $0.55\;W/cm^2\;and\;1W/cm^2$ at air and oxygen atmosphere, respectively. The I-V curve could be divided into two parts showing distinctive behavior. At low current density region (part I) the performance decreased steeply and at high current density region (part II) the performance decreased gradually. At the part I the performance decrease was especially resulted from the large cathode polarization, while at the part H the performance decrease related to the electrolyte polarization.
용융탄산염 연료전지의 운전변수가 단위전지 성능에 미치는 영향
임태훈,이갑수,남석우,오인환,홍성안,임희천 ( Tae Hoon Lim,Kab Soo Lee,Suk Woo Nam,In Hwan Oh,Seong Ahn Hong,Hee Chun Lim ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.3
To establish the operating conditions of molten carbonate fuel cells, the relationship between operating variables and the performance of the single cell with the active electrode area of 100 ㎠ was investigated. The single cell showed the open circuit voltage of 1.13 V and the cell voltage over 0.9 V at the current density of 150 mA/㎠. The performance decreased with the increase of the hydrogen utilization, while the effect of the oxygen utilization turned out to be negligible. The performance increased proportionally to the hydrogen partial pressure of the anode gas, but the highest performance was obtained at the cathode gas composition of 33% oxygen and 67% carbon dioxide which is the stoichiometric condition. Humidification of the anode stream to prevent carbon deposition dropped the cell voltage as much as the voltage loss estimated from the Nernst equation, and the oxygen gain was 50 mV and 90 mV at the condition of the open circuit voltage and at the current density of 150 mA/㎠, respectively. The cell voltage at the given conditions tended to increase with the increase of the operating temperature, but the increasing rate became smaller above 650℃
D2EHPA 를 담체로 사용한 유화액막에 의한 아미노산 농축의 연속 공정개발
홍성안,최형준,남석우 ( Seong Ahn Hong,Hyung Joon Choi,Suk Woo Nam ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.2
A continuous process of amino acid concentration by liquid emulsion membrane with a cationic extractant, D2EHPA, was developed and optimized with respect to the yield of amino acid, the degree of concentration, and membrane stability. Liquid emulsion membrane obtained from the demulsification of the emulsion could be reused without any problem. It was possible to concentrate the fermentation broth of initial concentration of 3.6% up to 17%. A simple and continuous process was proposed to reduce the amino acid concentration of fermentation broth down to 0.15%.
용융탄산염 연료전지의 운전변수가 성능에 미치는 영향에 대한 수치모사와 실험치와의 비교
안영주,정귀영,주재백,남석우,오인환,임태훈,홍성안 ( Young Joo Ahn,Gui Yung Chung,Jae Back Ju,Suk Woo Nam,In Hwan Oh,Tae Hoon Lim,Seong Ahn Hong ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.4
A mathematical model is proposed to simulate the effect of variables on cell performances of molten carbonate unit fuel cell at the constant temperature. Values of the total cell resistance calculated with twice of the Arrhenius constant in the equation of anode resistance, presented in the reference, agreed well with experimental data. On the basis of these results, numerical calculations of the effects of current density, the gas utilization(i.e. flow rate), gas compositions, and cell temperature on the cell performances were compared with experimental data[1]. At the constant temperature, numerical calculations of the effects of operating variables on the cell performances, such as voltage and power, were agreed well with experimental data.