Fuel cell as molten carbonate fuel cell (MCFC) operates at high temperatures. Thus, cogeneration processes may be performed, generating heat for its own process or for other purposes of steam generation in the industry. The use of ethanol is one of the best options because this is a renewable and less environmentally offensive fuel, and is cheaper than oil-derived hydrocarbons, as in the case of Brazil. In that country, because of technical, environmental, and economic advantages, the use of ethanol by steam reforming process has been the most investigated process. The objective of this study is to show a thermodynamic analysis of steam reforming of ethanol, to determine the best thermodynamic conditions where the highest volumes of products are produced, making possible a higher production of energy, that is, a more efficient use of resources. To attain this objective, mass and energy balances were performed. Equilibrium constants and advance degrees were calculated to get the best thermodynamic conditions to attain higher reforming efficiency and, hence, higher electric efficiency, using the Nernst equation. The advance degree (according to Castellan 1986, Fundamentos da Fisica/Quimica, Editora LTC, Rio de Janeiro, p. 529, in Portuguese) is a coefficient that indicates the evolution of a reaction, achieving a maximum value when all the reactants’ content is used of reforming increases when the operation temperature also increases and when the operation pressure decreases. However, at atmospheric pressure , the advance degree tends to stabilize in temperatures above ; that is, the volume of supplemental production of reforming products is very small with respect to high use of energy resources necessary. The use of unused ethanol is also suggested for heating of reactants before reforming. The results show the behavior of MCFC. The current density, at the same tension, is higher at than other studied temperatures such as 600 and . This fact occurs due to smaller use of hydrogen at lower temperatures that varies between 46.8% and 58.9% in temperatures between 600 and . The higher calculated current density is . The power density increases when the volume of ethanol to be used also increases due to higher production of hydrogen. The highest produced powers at are 99.8, 109.8, and for 873, 923, and , respectively. The thermodynamic efficiency has the objective to show the connection among operational conditions and energetic factors, which are some parameters that describe a process of internal steam reforming of ethanol.
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May 2008
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Thermodynamic Analysis of Direct Steam Reforming of Ethanol in Molten Carbonate Fuel Cell
José Luz Silveira,
José Luz Silveira
Energy Department, College of Engineering of Guaratinguetá,
e-mail: joseluz@feg.unesp.br
Sao Paulo State University (UNESP)
, 333 Guaratinguetá, Sao Paulo 12500-000, Brazil
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Antonio Carlos Caetano de Souza,
Antonio Carlos Caetano de Souza
Energy Department, College of Engineering of Guaratinguetá,
e-mail: caetanodesouza@yahoo.com.br
Sao Paulo State University (UNESP)
, 333 Guaratinguetá, Sao Paulo 12500-000, Brazil
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Márcio Evaristo da Silva
Márcio Evaristo da Silva
Energy Department, College of Engineering of Guaratinguetá,
e-mail: evaristosm@yahoo.com.br
Sao Paulo State University (UNESP)
, 333 Guaratinguetá, Sao Paulo 12500-000, Brazil
Search for other works by this author on:
José Luz Silveira
Energy Department, College of Engineering of Guaratinguetá,
Sao Paulo State University (UNESP)
, 333 Guaratinguetá, Sao Paulo 12500-000, Brazile-mail: joseluz@feg.unesp.br
Antonio Carlos Caetano de Souza
Energy Department, College of Engineering of Guaratinguetá,
Sao Paulo State University (UNESP)
, 333 Guaratinguetá, Sao Paulo 12500-000, Brazile-mail: caetanodesouza@yahoo.com.br
Márcio Evaristo da Silva
Energy Department, College of Engineering of Guaratinguetá,
Sao Paulo State University (UNESP)
, 333 Guaratinguetá, Sao Paulo 12500-000, Brazile-mail: evaristosm@yahoo.com.br
J. Fuel Cell Sci. Technol. May 2008, 5(2): 021012 (6 pages)
Published Online: April 18, 2008
Article history
Received:
October 25, 2005
Revised:
June 7, 2006
Published:
April 18, 2008
Citation
Silveira, J. L., de Souza, A. C. C., and da Silva, M. E. (April 18, 2008). "Thermodynamic Analysis of Direct Steam Reforming of Ethanol in Molten Carbonate Fuel Cell." ASME. J. Fuel Cell Sci. Technol. May 2008; 5(2): 021012. https://doi.org/10.1115/1.2759509
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