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RISS 인기검색어
- 검색키워드
- 주제어 : Sulphur poisoning (검색결과 4 건)
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Di Giulio, N.,Audasso, E.,Bosio, B.,Han, J.,McPhail, S.J. Elsevier 2015 International journal of hydrogen energy Vol.40 No.19
<P><B>Abstract</B></P> <P>Molten Carbonate Fuel Cells have reached the status of commercialization and are now ready for the challenge of market penetration. Nevertheless, new innovative applications such as the use of non-conventional fuels and their possible implementation in a Carbon Capture and Storage system, have given new importance to research activities. In particular, the gas feedings used in these applications contain impurities that can damage MCFCs and, of these, sulphur compounds seem to be the most harmful, even at low concentrations.</P> <P>The aim of this work is to test the effect of SO<SUB>2</SUB> on the role of the operating variables governing the electrochemical kinetics of MCFCs, investigate the relationships and advance additional data necessary for the reading of the complex interaction phenomena taking place in these conditions. The current work is therefore not intended to probe into the fundamental electrochemical mechanisms, but more to validate the window of viable operating conditions that can be expected in real applications. In particular, an experimental campaign was performed, feeding 2 ppm of SO<SUB>2</SUB> to the cathode of MCFC single-cells at different operating temperature and gas partial pressures (H<SUB>2</SUB>, CO<SUB>2</SUB>, O<SUB>2</SUB>), taking into account possible chemical, electrochemical and physical poisoning mechanisms.</P> <P>The experimental tests were performed at the Fuel Cell Research Centre laboratories of KIST (South Korea) and a preliminary theoretical analysis was also proposed to suggest operating strategies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low temperatures favour the SO<SUB>2</SUB> poisoning effect, especially under 640 °C. </LI> <LI> Optimal range for hydrogen composition is between 40% and 60%. </LI> <LI> The Oxygen concentration does not influence SO<SUB>2</SUB> poisoning for CO<SUB>2</SUB>/O<SUB>2</SUB> < 0.9. </LI> <LI> CO<SUB>2</SUB> compositions under 6% strongly amplify the impact of SO<SUB>2</SUB> poisoning. </LI> </UL> </P>
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Preliminary model and validation of molten carbonate fuel cell kinetics under sulphur poisoning
Audasso, E.,Nam, S.,Arato, E.,Bosio, B. Elsevier Sequoia 2017 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>MCFC represents an effective technology to deal with CO<SUB>2</SUB> capture and relative applications. If used for these purposes, due to the working conditions and the possible feeding, MCFC must cope with a different number of poisoning gases such as sulphur compounds. In literature, different works deal with the development of kinetic models to describe MCFC performance to help both industrial applications and laboratory simulations. However, in literature attempts to realize a proper model able to consider the effects of poisoning compounds are scarce.</P> <P>The first aim of the present work is to provide a semi-empirical kinetic formulation capable to take into account the effects that sulphur compounds (in particular SO<SUB>2</SUB>) have on the MCFC performance. The second aim is to provide a practical example of how to effectively include the poisoning effects in kinetic models to simulate fuel cells performances. To test the reliability of the proposed approach, the obtained formulation is implemented in the kinetic core of the SIMFC (SIMulation of Fuel Cells) code, an MCFC 3D model realized by the Process Engineering Research Team (PERT) of the University of Genova.</P> <P>Validation is performed through data collected at the Korea Institute of Science and Technology in Seoul.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Experimental investigation of the effect of Sulphur fed at the cathode side of MCFC. </LI> <LI> Set up of an MCFC kinetic formulation which takes account of the presence of SO<SUB>2</SUB>. </LI> <LI> Performance simulation and validation of MCFC single cells poisoned with SO<SUB>2</SUB>. </LI> </UL> </P>
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Experimental analysis of SO<sub>2</sub> effects on Molten Carbonate Fuel Cells
Di Giulio, N.,Bosio, B.,Han, J.,McPhail, S.J. Pergamon Press ; Elsevier Science Ltd 2014 International journal of hydrogen energy Vol.39 No.23
The aim of this work is to investigate how SO<SUB>2</SUB> can affect MCFC performance and to discover the possible mechanisms involved in cathode sulphur poisoning, specifically considering the possible use of MCFCs in CCS (Carbon Capture and Storage) application. The different contributions of cathodic, anodic and electrolyte reactions have been considered to get a complete picture of the evolution of performance degradation. Experimental tests have been performed at the Fuel Cell Centre laboratories of Korea Institute of Science and Technology (KIST) thanks to 100 cm<SUP>2</SUP> single cell facilities and comparing results using both an optimized gas for laboratory conditions and a gas composition that simulates MCFCs when running in a Natural Gas Combined Cycle (NGCC) power plant. Polarisation curves, endurance tests, impedance measurements and gas analyses have been carried out to support the investigation.
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Effect of sulfur on the cell performance in a molten carbonate fuel cell
이기정,Samuel Koomson,이충곤 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.4
This study evaluated the performance characteristics of a molten carbonate fuel cell (MCFC) under sulfur poisoning condition. A 100 cm2 bench-scale MCFC was used for the performance test. The performance of the cell at the normal operation condition was measured at 620 oC under atmospheric pressure. To evaluate the sulfur poisoning effect, 50 ppm H2S/Balanced N2 gas mixture at a flow rate of 30 ml/min was injected into the anode. The cell performance was analyzed via steady-state polarization (SSP) and inert gas step addition (ISA) methods. The overpotential of the cell was observed to have been changed by the injection of H2S gas, and an overpotential increase of ca. 40% was recorded after about 100 hours from the point of addition of the H2S gas. A voltage reduction rate of 2.62×104 mV/s was recorded at a current density of 150mA/cm2 after about 240 hours. The steady-state polarization characteristics of the cell showed that the sulfur poisoning was relatively slow. In addition, the effect of H2S gas on the cell performance was quantitatively measured by the ISA method.
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