• Title/Summary/Keyword: Molten carbonate fuel cells

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Dynamic Simulation of Molten Carbonate Fuel Cell and Mechanical Balance of Plant (용융탄산염연료전지 및 주변기기의 동적시뮬레이션)

  • Sung, Taehong;Kim, Kyung Chun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.38 no.2
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    • pp.121-128
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    • 2014
  • This study aims to develop a simulation bed for the mechanical balance of plants of high temperature fuel cells such as molten carbonate fuel cells. For using fuel cells in transportation, the optimization of the balance of plants should be considered. In this study, the dynamic model of a molten carbonate fuel cell and the model's responses to inlet gas composition, pressure, flow rate, and stack temperature were analyzed. On/off simulation was performed for testing the dynamic model's feasibility. The simulation results are in reasonable agreement with the experimental results from published literatures.

Investigation of Temperature Effect on Electrode Reactions of Molten Carbonate Electrolysis Cells and Fuel Cells using Reactant Gas Addition Method

  • Samuel Koomson;Choong-Gon Lee
    • Korean Chemical Engineering Research
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    • v.62 no.3
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    • pp.253-261
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    • 2024
  • The impact of temperature on electrode reactions in 100 cm2 molten carbonate cells operating as Fuel Cells (FC) and Electrolysis Cells (EC) was examined using the Reactant Gas Addition (RA) method across a temperature range of 823 to 973 K. The RA findings revealed that introduction of H2 and CO2, reduced the overpotential at Hydrogen Electrode (HE) in both the modes. However, no explicit temperature dependencies were observed. Conversely, adding O2 and CO2 to the Oxygen Electrode (OE) displayed considerable temperature dependencies in FC mode which can be attributed to increased gas solubility due to the electrolyte melting at higher temperatures. In EC mode, there was no observed temperature dependence for overpotential. Furthermore, the addition of O2 led to a decrease in overpotential, while CO2 addition resulted in an increased overpotential, primarily due to changes in the concentration of O2 species.

Operating Characteristics of MCFC System on the Diversification of Fuel (연료 다변화에 따른 용융 탄산염 연료전지 시스템 운전 특성)

  • Im, Seokyeon;Sung, Yongwook;Han, Jaeyoung;Yu, Sangseok
    • Journal of Hydrogen and New Energy
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    • v.26 no.2
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    • pp.156-163
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    • 2015
  • The fuel cells have been investigated in the applications of marine as the high efficient and eco-friendly power generating systems. In this study, modeling of IR Type molten carbonate fuel cell (Internal Reforming Type molten carbonate fuel cell) has been developed to analyze the feasibility of thermal energy utilization. The model is developed under Aspen plus and used for the study of system performances over regarding fuel types. The simulation results show that the efficiency of MCFC system based on NG fuel is the highest. Also, it is also verified that the steam reforming is suitable as pre-reforming for diesel fuel.

Constitution and Operation of the 25 kW Molten Carbonate Fuel Cell Power Generation System for Power Utility (25 kW급 전력사업용 MCFC 발전시스템 구성 및 운전평가)

  • Lim, Hee-Chun;Ahn, Kyo-Sang
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.687-689
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    • 2000
  • Molten Carbonate Fuel Cell (MCFC) with high electrical efficiency and low environmental effect has been developed for the commercial application of power generation fields. Recently we have built a 25 kW molten carbonate fuel cell power generation system and tested it. The MCFC system is composed of diverse peripheral units such as reformer, pre-heater, water purifier. electrical loader, gas supplier, and recycling systems. The stack itself was made of 40 cells of $6.000 cm^2$ area each. The stack showed an output of 28.6 kW power and a reliable performance at atmospheric operation. while in pressurized operation the stack showed an output 25.6 kW lower than the atmospheric operation. The reason of lower performance of pressurized operation was caused from a gas cross over shown in few cells in the stack.

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Lifetime Evaluation of AI-Fe Coating in Wet-seal Environment of MCFC

  • Jun, JaeHo;Jun, JoongHwan;Kim, KyooYoung
    • Corrosion Science and Technology
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    • v.3 no.4
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    • pp.161-165
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    • 2004
  • Aluminum source in an Al-Fe coating reacts with molten carbonate and develops a protective $LiAlO_2$ layer on the coating surface during operation of molten carbonate fuel cells (MCFC). However, if aluminum content in an Al-Fe coating decreases to a critical level for some reasons during MCFC operation, a stable and continuous $LiAlO_2$ protective layer can no longer be maintained. The aluminum content in an Al-Fe coating can be depleted by two different processes; one is by corrosion reaction at the surface between the aluminum source in the coating and molten carbonate, and the other is inward-diffusion of aluminum atoms within the coating into a substrate. In these two respects, therefore, the decreasing rate of aluminum concentration in an Al-Fe coating was measured, and then the influences of these two aspects on the lifetime of Al-Fe coating were investigated, respectively.

Biogas Purifying for Fuel cell Power Plant (연료전지 발전을 위한 바이오가스정제)

  • Lee, Jong-Gyu;Jun, Jae-Ho
    • Journal of Korean Society of Water and Wastewater
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    • v.21 no.4
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    • pp.439-444
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    • 2007
  • Using the anaerobic digester gas as a fuel, fuel cells have the potential to provide significant environmental and economic benefits. A molten carbonate fuel cell power plant was installed in the municipal sewage works of Tancheon in Seoul. The fuel cell unit operates on anaerobic digester gas and provides power and heat for the sewage works. This is the first project of its kind in Korea. This article outlines the experiences of gas purification process with planning, installation and operation. The engineering and installation phase is described regarding to the special features of digester gas, for example impurities in gas composition. Such impurities would be harmful to fuel cells. Operational results from the field test with a gas purification process plant are presented in this paper.

The Enhanced Physico-Chemical and Electrochemical Properties for Surface Modified NiO Cathode for Molten Carbonate Fuel Cells (MCFCs)

  • Choi, Hee Seon;Kim, Keon;Yi, Cheol-Woo
    • Bulletin of the Korean Chemical Society
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    • v.35 no.5
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    • pp.1305-1311
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    • 2014
  • The nickel oxide, the most widely used cathode material for the molten carbonate fuel cell (MCFC), has several disadvantages including NiO dissolution, poor mechanical strength, and corrosion phenomena during MCFC operation. The surface modification of NiO with lanthanum maintains the advantages, such as performance and stability, and suppresses the disadvantages of NiO cathode because the modification results in the formation of $LaNiO_3$ phase which has high conductivity, stability, and catalytic activity. As a result, La-modified NiO cathode shows low NiO dissolution, high degree of lithiation, and mechanical strength, and high cell performance and catalytic activity in comparison with the pristine NiO. These enhanced physico-chemical and electrochemical properties and the durability in marine environment allow MCFC to marine application as a auxiliary propulsion system.

Study on the Effects of the Flow Characteristics and Size on the Peformance of Molten Carbonate Fuel Cells Using CFD (CFD를 통한 용융탄산염 연료전지의 유동 및 크기에 따른 운전 특성 분석)

  • KIM, DONG-WOO;KIM, HA-YOUNG;CHOI, JEONG-HWAN;LEE, CHANG-WHAN
    • Journal of Hydrogen and New Energy
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    • v.30 no.2
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    • pp.147-154
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    • 2019
  • In this study, effects of flow types and size of molten carbonate fuel cells (MCFCs) were investigated using CFD simulation. In the simulation, the current collector of MCFCs were assumed to be an porous media. With the area of $0.09m^2$, the effect of flow types such as Co-flow, Counter-flow, Cross-flow were studied. After that the effect of the size and flow direction was studied. Among three-flow types, MCFCs with co-flow type shows more uniform distribution and current density distribution.

Corrosion of AI-Fe Coatings for Wet-Seal Area in Molten Carbonate Fuel Cells

  • Jun, JaeHo;Jun, JoongHwan;Kim, KyooYoung
    • Corrosion Science and Technology
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    • v.3 no.3
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    • pp.98-101
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    • 2004
  • The corrosion behavior of Al-Fe coatings was studied in the wet-seal atmosphere of molten carbonate fuel cells (MCFC). Fe-8Al, Fe-16Al, Fe-25Al, Fe-36Al, and Fe-70Al (in at.%) specimens were tested in Li/K carbonate at $650^{\circ}C$ by a single cell test and an immersion test. In general, the corrosion resistance of the Al-Fe coatings was enhanced due to the formation of a protective $LiAlO_2$ layer. However, when the Al-Fe coatings didn't have sufficient content of aluminum enough for maintaining the protective layer, the corrosion resistance of the Al-Fe coatings was severely degraded by the growth of non-protective scales like $LiAlO_2$. The test results revealed that the aluminum contents in the coatings should be higher than 25 at.% in order to form and maintain the protective $LiAlO_2$ layers.