• 제목/요약/키워드: Oxide fuel

검색결과 1,146건 처리시간 0.03초

저온 작동 박막 고체산화물 연료전지 (Fuel Cells for Intermediate Temperature Operations)

  • 심준형;차석원
    • 한국세라믹학회지
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    • 제43권12호
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    • pp.751-757
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    • 2006
  • Recently, a new type of solid oxide fuel cells has been developed employing extremely thin oxide electrolyte. These fuel cells are expected to operate at significantly reduced temperature compared to conventional solid oxide fuel cells. Accordingly, they may resolve the stability and material selection issues of high temperature fuel cells. Furthermore, they may eliminate the limitations of polymer membrane fuel cells whose operation temperature is under $100^{\circ}C$. In this paper, we review the electrolytes for intermediate temperature operation. Then, we discuss the current development of thin film solid oxide fuel cells that possibly operated at low temperatures.

Cell Fabrication and Performances of SOFC prepared by DBM and SPM

  • Kim, Gwi-Yeol
    • Transactions on Electrical and Electronic Materials
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    • 제8권6호
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    • pp.286-288
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    • 2007
  • The research and development for the solid oxide fuel cell have been promoted rapidly and extensively in recent years, because of their high efficiency and future potential. Therefore this paper describes the manufacturing method and characteristics of anode electrode for solid oxide fuel cell, by the way, Ni-YSZ materials are used as anode of solid oxide fuel cell widely. In order to reduce production costs, we have fabricated single solid oxide fuel cell by doctor blade and screen printing method. Disk-type planar solid oxide fuel cell with an effective electrode area of about $7cm^2$ were fabricated and run for 500 h to investigate cell performance. The current density at a voltage of 0.7 V was $850mA/cm^2$.

Solid Oxide Fuel Cells Designs, Materials, and Applications

  • Singhal Subhash C.
    • 한국세라믹학회지
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    • 제42권12호
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    • pp.777-786
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    • 2005
  • The Solid Oxide Fuel Cell (SOFC) is an electrochemical device to convert chemical energy of a fuel into electricity at temperatures from about 600 to $1000^{\circ}C$. The SOFC offers certain advantages over lower temperature fuel cells, notably its ability to use CO as a fuel rather than being poisoned by it, and high grade exhaust heat for combined heat and power, or combined cycle gas turbine applications. This paper reviews the operating principle, materials for different cell and stack components, cell designs, and applications of SOFCs. Among all designs of Solid Oxide Fuel Cells (SOFCs), the most progress has been achieved with the tubular design. However, the electrical resistance of tubular SOFCs is high, and specific power output $(W/cm^2)$ and volumetric power density $(W/cm^3)$ low. Planar SOFCs, in contrast, are capable of achieving very high power densities.

산소분리기술을 사용한 연료전지/순산소연소 발전시스템 해석 (Analysis of Solid Oxide Fuel Cell/Oxy-fuel Combustion Power Generation System Using Oxygen Separation Technology)

  • 박성구;김동섭;손정락;이영덕
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2008년도 추계학술대회 논문집
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    • pp.51-54
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    • 2008
  • This study aims to devise and analyze a power generation system combining the solid oxide fuel cell and oxy-fuel combustion technology. The fuel cell operates at an elevated pressure, a constituting a SOFC/gas turbine hybrid system. Oxygen is extracted from the high pressure cathode exit gas using ion transport membrane technology and supplied to the oxy-fuel power system. The entire system generates much more power than the fuel cell only system due to increased fuel cell voltage and power addition from oxy-fuel system. More than one third of the power comes out of the oxy-fuel system. The system efficiency is also higher than that of the fuel cell only system. Recovering most of the generated carbon dioxide is major advantage of the system.

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산화막을 입힌 지르코늄 합금의 수소화 반응에 관한 연구 (A Study on the Hydriding Reaction of Pre-oxidized Zr Alloys)

  • 김선기;방제건;김대호;임익성;양용식;송근우
    • 한국세라믹학회지
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    • 제47권2호
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    • pp.106-112
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    • 2010
  • This paper presents some experimental results on incubation time for massive hydriding of Zr alloys with oxide thickness. Oxide effects experiments on massive hydriding reaction of commercial Zr alloy claddings and pre-oxidized Zr alloys with hydrogen gas were carried out in the temperature range from 300 to $400^{\circ}C$ with thermo-gravimetric apparatus. Experimental results for oxide effects on massive hydriding kinetics show that incubation time is not proportional to oxide thickness and that the massive hydriding kinetics of pre-filmed Zr alloys follows linear kinetic law and the hydriding rate are similar to that of oxide-free Zr alloys once massive hydriding is initiated. There was a difference in micro-structures between oxide during incubation time and oxide after incubation time. Physical defects such as micro-cracks and pores were observed in only oxide after incubation time. Therefore, the massive hydriding of Zr alloys seems to be ascribed to short circuit path, mechacical or physical defects, such as micro-cracks and pores in the oxide rather than hydrogen diffusion through the oxide resulting from the increase of oxygen vacancies in the hypostoichiometric oxide.

저온 평판형 고체산화물 연료전지 내부 열 및 물질전달 현상에 대한 전산해석 (Computational Analysis of Heat and Mass Transfer in a Planar-type Solid Oxide Fuel Cell)

  • 정희석;차훈;손정락;노승탁
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2005년도 제17회 워크샵 및 추계학술대회
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    • pp.648-654
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    • 2005
  • The performance prediction of a planar-type solid oxide fuel ceil is conducted by a computational analysis. The transport processes are formulated with the help of a simplified treatment of heat generation by the electrochemical reaction. From the result of the computational analysis, it is shown that the electrochemical reaction is closely related to the transport phenomena inside a solid oxide fuel cell. Transport phenomena including heat and mass transfer have influence on the distribution of local current density and as a result, on the performance characteristics of the fuel cell. Computational analysis is also extended to the parametric study to investigate the performance behavior of the fuel cell with different amount of supplied fuel flow rates. It is also demonstrated that the mathematical formulation and computational procedures proposed in this study can be applied to prove the importance of the specific TPB(Three-Phase-Boundary) area in the manufacturing process of electrodes in a solid oxide fuel cell.

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전기화학 반응에 의한 생성 열의 단순화된 처리 기법을 이용한 평판형 고체산화물 연료전지 내부의 이동현상에 대한 전산 해석 (Computational Analysis of Transport Phenomena in a Planar-Type Solid Oxide Fuel Cell with a Simplified Treatment of the Electrochemical Heat Generation)

  • 차훈;손정락;노승탁
    • 한국세라믹학회지
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    • 제42권12호
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    • pp.846-853
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    • 2005
  • For the performance prediction of a planar-type solid oxide fuel cell, the computational analysis of transport phenomena with a simplified treatment of heat generation by the electrochemical reaction is conducted. From the result of the computational analysis, it is shown that the electrochemical reaction is closely related to the transport phenomena inside a solid oxide fuel cell. Transport phenomena including heat and mass transfer influences on the distribution of local current density and, as a result, on the performance characteristics of the fuel cell. Computational analysis is also extended to the parametric study to investigate the performance behavior of the fuel cell with different amount of supplied fuel flow rates. It is also demonstrated that the mathematical formulation and computational procedures proposed in this study can be applied to prove the importance of the specific TPB area in the manufacturing process of electrodes in solid oxide fuel cells.

고체 전해질형 연료전지의 연구개발동향 (Research and Development Trend of Solid Oxide Fuel Cell)

  • 김귀열;엄승욱;윤문수
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1993년도 추계학술대회 논문집
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    • pp.116-119
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    • 1993
  • Solid Oxide Fuel Cell is an excellent electric generator with regard with preservation of environment and the energysavings. The objectives of this study are to investigate the status of Solid Oxide Fuel Cel1 technologies.

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고체산화물 연료전지/마이크로 가스터빈 하이브리드 시스템의 성능 해석 (Performance Analysis of a Solid Oxide Fuel Cell/Micro Gas Turbine Hybrid System)

  • 양진식;송태원;김재훈;손정락;노승탁
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2005년도 춘계학술대회
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    • pp.273-276
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    • 2005
  • Performance analysis of a solid oxide fuel cell/micro gas turbine hybrid system is conducted at design-point and part-load conditions and its results are discussed in this study. With detailed considerations of the heat and mass transfer phenomena along various flow streams of the SOFC, the analysis based on a quasi-2D model reasonably predicts its performance at the design-point operating conditions. In case of part-load operations, performance of the hybrid system to three different operation modes(fuel only control, speed control, and VIGV control) is compared. It is found that the simultaneous control of both supplied fuel and air to the system with a variable MGT rotational speed mode is the optimum choice for the high performance operation. And then, the dynamic characteristics of a solid oxide fuel cell are briefly introduced.

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Effect of Impinging Plate on Exhaust Emission and Engine Performance in Diesel Engine

  • Jin, Yong-Su;Kim, Jae-Dong;Kim, Yeong-Sik
    • 동력기계공학회지
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    • 제19권4호
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    • pp.82-88
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    • 2015
  • The purpose of this study is to investigate the effect of the impinging plate on combustion process in Diesel engine. Especially, the variation of exhaust emission and engine performance by the change of fuel injection timing and fuel injection pressure between the trial engine with impinging plate and the prototype engine were examined. The nitrogen oxide concentration of the trial engine decreased more than 50% compared to the prototype engine, however, smoke concentration of the trial engine indicated higher degree than the prototype engine. The smoke concentration, fuel consumption rate and exhaust gas temperature decreased as the fuel injection timing become faster, whereas the nitrogen oxide concentration decreased as the fuel injection timing is retarded. The nitrogen oxide concentration, fuel consumption rate and exhaust gas temperature decreased as the fuel injection pressure become lower. But smoke concentration decreased as the fuel injection pressure become higher.