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Research Papers

Ultralow Carbon Dioxide Emission MCFC Based Power Plant

[+] Author and Article Information
Daniele Chiappini

Department of Mechanical Engineering, University of Rome “Tor Vergata”, 00133 Rome, Italychiappini@ing.uniroma2.it

Luca Andreassi

Department of Mechanical Engineering, University of Rome “Tor Vergata”, 00133 Rome, Italyluca.andreassi@uniroma2.it

Elio Jannelli

Department of Technologies, University of Naples “Parthenope”, 80143 Naples, Italyelio.jannelli@uniparthenope.it

Stefano Ubertini

Department of Technologies, University of Naples “Parthenope”, 80143 Naples, Italystefano.ubertini@uniparthenope.it

J. Fuel Cell Sci. Technol 8(3), 031003 (Feb 16, 2011) (8 pages) doi:10.1115/1.4002903 History: Received November 23, 2009; Revised October 07, 2010; Published February 16, 2011; Online February 16, 2011

The application of high temperature fuel cells in stationary power generation seems to be one of the possible solutions to the problem related to the environment preservation and to the growing interest for distributed electric power generation. Great expectations have been placed on both simple and hybrid fuel cell plants, thus making necessary the evolution of analysis strategies to evaluate thermodynamic performance, design improvements, and acceleration of new developments. This paper investigates the thermodynamic potential of combining traditional internal combustion energy systems (i.e., gas turbine and internal combustion engine) with a molten carbonate fuel cell for medium- and low-scale electrical power productions with low CO2 emissions. The coupling is performed by placing the fuel cell at the exhaust of the thermal engine. As in molten carbonate fuel cells the oxygen-charge carrier in the electrolyte is the carbonate ion, part of the CO2 in the gas turbine flue gas is moved to the anode and then separated by steam condensation. Plant performance is evaluated in function of different parameters to identify optimal solutions. The results show that the proposed power system can be conveniently used as a source of power generation.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic representation of a molten carbonate fuel cell operation

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Figure 2

Schematic representation of input and output data for the reformer model

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Figure 3

Schematic representation of input and output data for the fuel cell model

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Figure 4

Penalization factor map as a function of CO2 concentration and pO2/pCO2

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Figure 5

Penalization factor: (a) influence of CO2 concentration and (b) influence of pO2/pCO2

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Figure 6

Influence of the penalization factor on the polarization curve

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Figure 7

Schematic representation of the power plant

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Figure 8

Penalization factor as a function of ξ=ṁair/ṁICE. The effects of both dilution and partial pressure ratio are reported.

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Figure 9

Comparison between two different working curves corresponding to GTPP and ICE

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Figure 10

Influence of cell potential on power plant electrical and exergetic efficiencies

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Figure 11

Influence of cell potential on cell dimensions

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Figure 12

Influence of cathode recirculation on power plant electrical and exergetic efficiencies

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Figure 13

Influence of cathode recirculation on cell dimensions

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Figure 14

Influence of cathode recirculation on the dilution of CO2 for the GTPP-MCFC plant. The table reports the molar concentrations at the cathode inlet.

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Figure 15

Influence of recirculation percentage on the dilution of CO2 for the ICE-MCFC plant. The table reports the molar concentrations at the cathode inlet.

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