• Journal of Navigation and Port Research
• /
• v.48 no.2
• /
• pp.125-136
• /
• 2024

This research presents an innovative integrated ethanol solid oxide fuel cell (SOFC) system designed for applications in marine vessels. The system incorporates an exhaust gas heat recovery mechanism. The high-temperature exhaust gas produced by the SOFC is efficiently recovered through a sequential process involving a gas turbine (GT), a regenerative system, steam Rankine cycles, and a waste heat boiler (WHB). A comprehensive thermodynamic analysis of this integrated SOFC-GT-SRC-WHB system was performed. A simulation of this proposed system was conducted using Aspen Hysys V12.1, and a genetic algorithm was employed to optimize the system parameters. Thermodynamic equations based on the first and second laws of thermodynamics were utilized to assess the system's performance. Additionally, the exergy destruction within the crucial system components was examined. The system is projected to achieve an energy efficiency of 58.44% and an exergy efficiency of 29.43%. Notably, the integrated high-temperature exhaust gas recovery systems contribute significantly, generating 1129.1 kW, which accounts for 22.9% of the total power generated. Furthermore, the waste heat boiler was designed to produce 900.8 kg/h of superheated vapor at 170 ℃ and 405 kP a, serving various onboard ship purposes, such as heating fuel oil and accommodations for seafarers and equipment.

• 한국신재생에너지학회:학술대회논문집
• /
• 2005.11a
• /
• pp.655-655
• /
• 2005

• 기계와재료
• /
• v.21 no.2
• /
• pp.6-23
• /
• 2009

고체산화물 연료전지(SOFC)는 복합 발전시 70% 가까운 발전효율을 기대할 수 있고 환경 특성이 우수하며 귀금속 촉매를 사용하지 않으므로 저비용화가 가능해 최근 활발한 기술/개발 양상을 보이고 있다. SOFC의 상용화와 범용화를 가속화하기 위해서는 핵심 소재인 셀 구성요소(전해질, 전극, 연결재 등)의 특성 향상이 요구되며 특히 향후 중 저온에서 작동 가능한 SOFC 기술 개발을 위해 저온 작동형 셀 소재에 대한 연구도 활발히 진행되고 있다. 따라서 본 고에서는 SOFC용 셀 소재의 중요성을 고려하여 고체산화물 연료전지의 셀 구성 소재 및 제조기술을 중심으로 기술하였고 주요 관련 기술들도 소개하였다.

• 한국신재생에너지학회:학술대회논문집
• /
• 2010.06a
• /
• pp.123.1-123.1
• /
• 2010

The solid oxide fuel cell (SOFC) has attracted great deal of attention due to its high electrical efficiency, high waste-heat utilization, fuel flexibility, and application versatility. However, SOFC technology is still not matured enough to fulfill the practical requirements for commercialization. Therefore, all the research and development activities are mainly focused on a development of practically viable SOFCs with higher performance and better reliability. We were successful in fabricating high-performance anode-supported unit cells by employing hierarchically controlled multi-layered electrodes for both structural reliability and high performance. In addition, a novel composite sealing gasket made it possible to achieve excellent sealing integrity even with considerable surface irregularities in a multi-cell planar arrayed stack.

• 한국신재생에너지학회:학술대회논문집
• /
• 2010.06a
• /
• pp.128.1-128.1
• /
• 2010

본 연구는 세라믹 연결재로 사용되는 Perovskite 구조의 LYSMO조성의 실제 SOFC stack적용을 위한 소결온도 제어방법에 관해 연구하였다. SOFC 단전지에서 IC소재는 $1300{\sim}{\cdot}1400^{\circ}C$의 온도에서 소결이 이루어져만 하나 현재 연구발표된 IC는 대부분이 $1500^{\circ}C$ 이상에서 소결이 되므로 실제 stack적용에 문제가 있다. 이러한 문제를 해결하기위해 IC소재에 소결조제를 첨가하여 소결온도를 제어코자 하였다. 실험결과 $MgB_6$와 $LaB_6$등의 불화물계의 첨가가 세라믹 연결재의 소결온도 감소에 효과적인 것으로 나타났다. 소결조제의 첨가는 소결온도의 감소를 이끌었지만 열팽창 계수에는 큰 영향을 끼치지는 않았다. 하지만 전기적 특성은 큰 폭으로 감소하여 전기전도도 개선을 위한 다른 방안이 필요함을 확인할 수 있었다.

• Proceedings of the KSME Conference
• /
• 2004.11a
• /
• pp.1652-1657
• /
• 2004

Model for the dynamic simulation of dynamic behaviors of a solid oxide fuel cell (SOFC) is provided. This model is based upon (1) coupled mass and heat transfer characteristics and (2) important chemical reactions such as electrochemical and reforming reaction in high temperature fuel cells such as SOFC. It is found that the thermal inertia of solid materials in SOFC plays an important role to the dynamic behavior of cell temperature. Dynamic characteristics of cell voltage, power and chemical compositions with different levels of load changes are investigated.

• 한국신재생에너지학회:학술대회논문집
• /
• 2009.06a
• /
• pp.349-352
• /
• 2009

In this study, the relation between the performance degradation of SOFC single cell and the increase of polarization resistance for the cathode is investigated. $Pr_{0.3}Sr_{0.7}Co_{0.3}Fe_{0.7}O_3$(PSCF3737, $19.4{\times}10^{-6}K^{-1}$) and $Gd_{0.1}Ce_{0.9}O_2$ (CGO91, $12{\times}10^{-6}K^{-1}$) are used as a cathode and an electrolyte, respectively. The polarization resistance of cathode is increased due to the delamination caused by thermal expansion coefficient difference. The voltage drop with 10%/1000h decline rate occurs during long-term, when the interface between the cathode and the electrolyte is delaminated due to TEC difference.

• 한국신재생에너지학회:학술대회논문집
• /
• 2007.06a
• /
• pp.161-165
• /
• 2007

Recently by the development of the electronic engineering technology various mobile devices are developed. But their operation time need to be extended although capacity of the batteries are limited. We focused our attention to the portable SOFC system. Because SOFC has the high efficiency and a lot of strongness in comparison with other kinds of fuel cells. In addition they can be built as a self/non-reformable system and single/dual chamber system. So We evaluated some types of SOFC theoretically, and compared the results from the fuel and performance efficiency point of view.

• 한국신재생에너지학회:학술대회논문집
• /
• 2006.11a
• /
• pp.455-458
• /
• 2006

최근 들어 고체산화물 연료전지(SOFC) 기술이 급성장함에 따라 고온 수증기 전기분해(HTE) 기술이 물로부터 수소를 대량으로 제조할 수 있는 환경 친화적인 기술로 주목 받고 있다 고온 수증기 전기분해는 기존의 액상 전기분해보다 총 에너지 요구량이 작고 전기분해에 필요한 최소의 전기에너지가 온도가 증가할수록 감소하며 고온 수증기 전기분해에 요구되는 에너지의 일부를 전기에너지 대신 열의 형태로 공급이 가능하여 보다 높은 효율을 기대할 수 있다. 따라서 off peak시 기저부하전력을 이용하고, 공정의 열원으로 고온가스의 폐열, 천연가스의 부분산화 반응열 또는 고온 가스원자로의 폐열을 활용하면 SOFC 이용 고온 수증기 전기분해 공정은 수소경제사회에서 요구되는 수소를 대량으로 제조할 수 있는 경제적인 공정이 될 것이다.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2003.04a
• /
• pp.327-339
• /
• 2003

In this paper, a self-organizing fuzzy controller(SOFC) for the industrial robot manipulator with a actuator located at the base is studied A fuzzy login composed of linguistic conditional statements is employed by defining the relations of input-output variable of the controller, In the synthesis of a FLC, one of the most difficult problems is the determination of linguistic control rules from the human operators. To overcome this difficult SOFC is proposed for a hierarchical control structure consisting of basic level and high level that modify control rules. The proposed SOFC scheme is simple in structure, fast in computations and suitable for implementation of real-time control. Performance of the SOFC is illustrated by simulation and experimental results for robot with low joints.