• 제목/요약/키워드: Solid Oxide Fuel Cell System

검색결과 146건 처리시간 0.035초

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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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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저온 고체산화물연료전지 구현을 위한 다층 나노기공성 금속기판의 제조 (Development of Metal Substrate with Multi-Stage Nano-Hole Array for Low Temperature Solid Oxide Fuel Cell)

  • 강상균;박용일
    • 한국세라믹학회지
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    • 제42권12호
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    • pp.865-871
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    • 2005
  • Submicron thick solid electrolyte membrane is essential to the implementation of low temperature solid oxide fuel cell, and, therefore, development of new electrode structures is necessary for the submicron thick solid electrolyte deposition while providing functions as current collector and fuel transport channel. In this research, a nickel membrane with multi-stage nano hole array has been produced via modified two step replication process. The obtained membrane has practical size of 12mm diameter and $50{\mu}m$ thickness. The multi-stage nature provides 20nm pores on one side and 200nm on the other side. The 20nm side provides catalyst layer and $30\~40\%$ planar porosity was measured. The successful deposition of submicron thick yttria stabilized zirconia membrane on the substrate shows the possibility of achieving a low temperature solid oxide fuel cell.

Thermodynamic analysis of a combined gas turbine power plant with a solid oxide fuel cell for marine applications

  • Welaya, Yousri M.A.;Mosleh, M.;Ammar, Nader R.
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제5권4호
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    • pp.529-545
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    • 2013
  • Strong restrictions on emissions from marine power plants (particularly $SO_x$, $NO_x$) will probably be adopted in the near future. In this paper, a combined solid oxide fuel cell (SOFC) and gas turbine fuelled by natural gas is proposed as an attractive option to limit the environmental impact of the marine sector. It includes a study of a heat-recovery system for 18 MW SOFC fuelled by natural gas, to provide the electric power demand onboard commercial vessels. Feasible heat-recovery systems are investigated, taking into account different operating conditions of the combined system. Two types of SOFC are considered, tubular and planar SOFCs, operated with either natural gas or hydrogen fuels. This paper includes a detailed thermodynamic analysis for the combined system. Mass and energy balances are performed, not only for the whole plant but also for each individual component, in order to evaluate the thermal efficiency of the combined cycle. In addition, the effect of using natural gas as a fuel on the fuel cell voltage and performance is investigated. It is found that a high overall efficiency approaching 70% may be achieved with an optimum configuration using SOFC system under pressure. The hybrid system would also reduce emissions, fuel consumption, and improve the total system efficiency.

Solid Oxide Fuel Cells for Power Generation and Hydrogen Production

  • Minh, Nguyen Q.
    • 한국세라믹학회지
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    • 제47권1호
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    • pp.1-7
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    • 2010
  • Solid oxide fuel cells (SOFCs) have been under development for a variety of power generation applications. Power system sizes considered range from small watt-size units (e.g., 50-W portable devices) to very large multi-megawatt systems (e.g., 500-MW base load power plants). Because of the reversibility of its operation, the SOFC has also been developed to operate under reverse or electrolysis mode for hydrogen production from steam (In this case, the cell is referred to as solid oxide electrolysis cell or SOEC.). Potential applications for the SOEC include on-site and large-scale hydrogen production. One critical requirement for practical uses of these systems is long-term performance stability under specified operating conditions. Intrinsic material properties and operating environments can have significant effects on cell performance stability, thus performance degradation rate. This paper discusses potential applications of the SOFC/SOEC, technological status and current research and development (R&D) direction, and certain aspects of long-term performance degradation in the operation of SOFCs/SOECs for power generation/hydrogen production.

Improving the Stability of Series-Connected Solid Oxide Fuel Cells by Modifying the Electrolyte Composition

  • Kim, Young Je;Lim, Hyung-Tae
    • Journal of Electrochemical Science and Technology
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    • 제12권1호
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    • pp.159-165
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    • 2021
  • YSZ based anode supported solid oxide fuel cells (SOFCs) were prepared, and two cells with different electrolyte thicknesses were connected in series for the simulation of a cell-imbalanced fuel cell stack. Pure YSZ cells in a series connection exhibited a rapid degradation when a thick electrolyte cell was operated under a negative voltage. On the other hand, ceria added-YSZ cells in a series connection were stable under similar operating conditions, and the power density and impedance were about the same as those before tests. The improved stability was due to the reduction of internal partial pressure in the electrolyte by locally increasing the electronic conduction. Thus, we propose a new protection method, i.e., the local addition of ceria in the YSZ electrolyte, to extend the lifetime of a cell-imbalanced SOFC stack.

고체산화물 연료전지용 예혼합 연소시스템 개발 (Development of Combustion System for Solid Oxide Fuel Cell System)

  • 조순혜;이필형;차천륜;홍성원;황상순
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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    • pp.96.1-96.1
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    • 2011
  • Solid oxide fuel cells(SOFCs) can convert the chemical energy of fuel into electricity directly. With the rising fuel prices and stricter emission requirement, SOFCs have been widely recognized as a promising technology in the near future. In this study, lean premixed flame using the orifice swirl burner was analyzed numerically and experimentally. We used the program CHEMKIN and the GRI 3.0 chemical reaction mechanism for the calculation of burning velocity and adiabatic flame temperature to investigate the effects of equivalence ratio on the adiabatic flame temperature and burning velocity respectively. Burning velocity of hydrogen was calculated by CHEMKIN simulation was 325cm/s, which was faster than that of methane having 42 cm/s at the same equivalence ratio. Also Ansys Fluent was used so as to analysis the performance with alteration of swirl structure and orifice mixer structure. This experimental study focused on stability and emission characteristics and the influence of swirl and orifice mixer in Solid Oxide Fuel Cell Systme burner. The results show that the stable blue flame with different equivalence ratio. NOx was measured below 20 ppm from equivalence ratios 0.72 to 0.84 and CO which is a very important emission index in combustor was observed below 160 ppm under the same equivalence region.

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가스터빈의 성능과 연료전지의 출력비중이 고체산화물 연료전지/가스터빈 하이브리드 시스템 성능에 미치는 영향 (Influence of Gas Turbine Performance and Fuel Cell Power Share on the Performance of Solid Oxide Fuel Cell/Gas Turbine Hybrid Systems)

  • 안지호;강수영;김동섭
    • 대한기계학회논문집B
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    • 제36권4호
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    • pp.439-447
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    • 2012
  • 출력 규모가 다른 세가지 상용 가스터빈들을 바탕으로 고체산화물 연료전지/가스터빈 하이브리드 시스템을 구성하고 성능을 비교하였다. 각 가스터빈을 사용할 때 연료전지와 가스터빈의 출력 비중 및 효율을 비교, 분석하였고 연료전지 설계온도를 변화시키면서 출력 비중의 변화와 시스템 효율 변화를 분석하였다. 수십 kW 급 소형 가스터빈을 사용한 하이브리드 시스템에서는 연료전지 온도가 변하여도 효율은 거의 변화가 없었지만 MW 급 및 수백 MW 급 등 중,대형 가스터빈을 사용하는 경우에는 연료 전지 작동온도가 높아질수록 시스템 효율이 높아짐을 확인하였다. 또한 연료전지로 공급되는 공기량을 조절하여 연료전지 출력 비중을 변화시키는 것에 대해서도 해석하였다.

스팀분사를 고려한 SOFC/GT 하이브리드 시스템의 설계 성능 비교 분석 (Design Performance Analysis of Solid Oxide Fuel Cell / Gas Turbine Hybrid Systems Considering Steam Injection)

  • 박성구;김동섭
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회B
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    • pp.3224-3229
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    • 2007
  • This study aims to analyse the influence of steam injection on the performance of hybrid systems combining a solid oxide fuel cell and a gas turbine. The steam is generated by recovering heat from the exhaust gas. Two system configurations, with difference being the operating pressure of the SOFC, are examined and effects of steam injection on performances of the two systems are compared. Two representative gas turbine pressure ratios are simulated and a wide range of both the fuel cell temperature and the turbine inlet temperature is examined. Without steam injection, the pressurized system generally exhibits better system efficiency than the ambient pressure system. Steam injection increases system power capacity for all design cases. However, its effect on system efficiency varies much depending on design conditions. The pressurized system hardly takes advantage of the steam injection in terms of the system efficiency. On the other hand, steam injection contributes to the efficiency improvement of the ambient pressure system in some design conditions. A higher pressure ratio provides a better chance of efficiency increase due to steam injection.

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가압형 고체산화물 연료전지/가스터빈 하이브리드 시스템의 현실적 설계 (A Practical Design of Pressurized Solid Oxide Fuel Cell/Gas Turbine Hybrid Systems)

  • 오경석;박성구;김동섭
    • 대한기계학회논문집B
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    • 제31권2호
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    • pp.125-131
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    • 2007
  • This paper presents guideline for a practical design of the hybrid system combining a pressurized solid oxide fuel cell and a gas turbine. Design of the hybrid system based on a virtually designed gas turbine was simulated using models for off-design operation of the gas turbine. Two system configurations, with different method for supplying reforming steam, are considered and their design characteristics are compared. A higher design cell temperature provides better system performance. However, there exists a maximum allowable design cell temperature because the operating point of the compressor approaches the surge point with increasing fuel cell temperature. Increased pressure loss at the fuel cell moves the compressor operating point toward the surge point and reduces system performance.