• Title/Summary/Keyword: 용융 탄산염 연료전지

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A Study on Reactions of Carbon-Carbonate Mixture at Elevated Temperature: As an Anode Media of SO-DCFC (SO-DCFC 적용을 위한 카본블랙-탄산염 혼합 매개체의 고온 반응 특성에 대한 연구)

  • Yu, Jun Ho;Kang, Kyungtae;Hwang, Jun Young
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.38 no.8
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    • pp.677-685
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    • 2014

  • A direct carbon fuel cell (DCFC) generates electricity directly by converting the chemical energy in coal. In particular, a DCFC system with a solid oxide electrolyte and molten carbonate anode media has been proposed by SRI. In this system, however, there are conflicting effects of temperature, which enhances the ion conductivity of the solid electrolyte and reactivity at the electrodes while causing a stability problem for the anode media. In this study, the effect of temperature on the stability of a carbon-carbonate mixture was investigated experimentally. TGA analysis was conducted under either nitrogen or carbon dioxide ambient for $Li_2CO_3$, $K_2CO_3$, and their mixtures with carbon black. The composition of the exit gas was also monitored during temperature elevation. A simplified reaction model was suggested by considering the decomposition of carbonates and the catalyzed Boudouard reactions. The suggested model could well explain both the measured weight loss of the mixture and the gas formation from it.

  • https://doi.org/10.3795/KSME-B.2014.38.8.677 인용 PDF KSCI

Waste heat recovery of recirculated MCFC using supercritical carbon dioxide power cycle (초임계 이산화탄소 사이클을 이용한 연료 재순환 MCFC의 폐열회수)

  • Lee, Jae Yoon;Ahn, Ji Ho;Kim, Tong Seop
    • Plant Journal
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    • v.15 no.2
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    • pp.42-45
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    • 2019

  • The molten carbonate fuel cell has a high temperature of waste heat and can constitute a bottoming cycle to increase the efficiency. Previous study used a bottoming cycle as steam turbine cycle. In this study, we are going to replace the bottoming cycle with a supercritical carbon dioxide power cycle. The system power was compared to consider replacing the bottoming cycle. As a result, the power of the supercritical carbon dioxide power cycle at the present development stage is lower than that of the steam turbine cycle, but theoretically, the power can be larger than the steam turbine cycle. If the supercritical carbon dioxide power cycle improves the isentropic efficiency of the turbine by 89%, the isentropic efficiency of the compressor by 83%, and the effectiveness of the recuperator by 0.9, the power can be same to the steam turbine cycle.

  • PDF KSCI