1,721,059 research outputs found
Assessment of Molten Carbonate Fuel Cell Models and Integration with Gas and Steam Cycles
No full textDiffusive resistance analysis in fuel cells. Part 2. Some methods and examples
No full textIn the first part of this work a rationalisation and a generalisation of the approach to the analysis of the diffusive resistances in laboratory-scale fuel cells and electrodes was recommended and some interpretation tools for the purpose were suggested and some simple reference cases discussed.
This second part is mainly devoted to some applications to experimental data. In particular, some sets of experimental data from Ansaldo Fuel Cells laboratories are examined. The data regard molten carbonate fuel cells at a 10 cm × 10 cm laboratory scale; a first set of data was obtained under constant current and changing utilisation factor conditions; the second under limit current conditions.
The analysis indicated that the cathodic diffusive resistances are not important and the anodic ones, when correctly determined, do not depend on the anodic gas flow rate, but are likely to be localised in the liquid phase
Process analysis of 1MW MCFC plant
No full textMolten carbonate fuel cells (MCFCs) have received a great deal of attention in recent years and are now at a pre-commercial stage.
In this work, referring to the simulation experience of the Department of Environmental Engineering of the University of Genoa (DIAM),
the process analysis of a reference 500kW MCFC plant will be presented.
The new philosophy of distributed energy supply for the production and the distribution of electrical energy focuses its attention on plants
with a power size in the range of 1–10MW. For this reason the simulation of a 1MW MCFC system will be considered, both on the basis of
a 500kW plant scheme, and taking into account some modifications for improving its performance, and the results of the simulation will be
discussed
Identification problems and analysis of the limit current in fuel cells
No full textThis paper presents our analysis of the mass transfer phenomena in fuel cells. Our attention was specifically focused on the parameter identification problems (briefly identification problems) related to the interpretation of the experimental data on the limit current.
Two factors work together to make the interpretation of the limit current data difficult: the presence of two interacting electrodes (electrode coupling phenomena) and the flow rate changes along each electrode. The first effect can be well defined and understood by studying reagent-poor inlet flow rates to the electrodes; the second effect can be analysed by superimposition. In this analysis, the asymptotic solutions for complete decoupling conditions, that are complete anodic (or cathodic) mass transfer control, have been shown to be very useful reference tools
Diffusive resistance analysis in fuel cells. Part 1. Some theoretical considerations
No full textThis work proposes the use of a rigorous approach to the analysis of the fuel-cell diffusive resistances not only at the commercial scale, but also at the laboratory one. The attention used experimentally for checking diffusion resistances in electrodes, cells and stacks should imply the same attention in the corresponding data analysis techniques.
For this reason, some corrections to the most common interpretation and correlation procedures have been introduced on the basis of the study of complex electrodes and comparing these ones with simple ones.
In Part 1 of this work a theoretical discussion of some simple reference cases will be reported. In Part 2 some examples of applications to the interpretation of the experimental data will be given
Modeling and Experimentation of Molten Carbonate Fuel Cell Reactors in a Scale-up Process
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