Dynamic modelling and sensitivity analysis of a tubular SOFC fuelled with NH3 as a possible replacement for H2

Hajimolana, S.A. and Hussain, M.A. and Daud, W.M.A.W. and Chakrabarti, M.H. (2012) Dynamic modelling and sensitivity analysis of a tubular SOFC fuelled with NH3 as a possible replacement for H2. Chemical Engineering Research and Design, 90 (11). pp. 1871-1882. ISSN 02638762

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Abstract

A dynamic model of an ammonia fed-tubular solid oxide fuel cell (NH 3-SOFC) is developed and presented. The model accounts for diffusion, inherent impedance, transport (heat and mass transfer), electrochemical reactions, activation and concentration polarizations of electrodes and the ammonia decomposition reaction. Sensitivity analyses are conducted upon the effects of design parameters on the fuel cell performance. Dynamic output voltage, fuel-cell-tube temperature and efficiency responses to step changes in the inlet fuel flow pressure with different values of design parameters are discussed. It is found that among the studied parameters, the inner cell tube diameter has the strongest effect on fuel cell efficiency. On the other hand, the influence of cathodic porosity on fuel cell performance and transient response is higher than that of the anodic porosity. The transient response with different sizes of micro and macro-structures is studied and it is observed that changing the fuel cell length has the most effect. Also NH 3-SOFC is compared with H 2-SOFC and it is found that the performance of the former is close to that of the latter thus signifying that ammonia is a suitable fuel for substituting in place of hydrogen.

Item Type: Article
Additional Information: Cited By (since 1996): 1 Export Date: 5 March 2013 Source: Scopus CODEN: CERDE Language of Original Document: English Correspondence Address: Hussain, M.A.; Department of Chemical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia; email: mohdazlan@um.edu.my References: An, C.M., Song, J.H., Kang, I.K., Sammes, N., The effect of porosity gradient in a Nickel/Yttria Stabilized Zirconia anode for an anode-supported planar solid oxide fuel cell (2003) J. Power Sources, 195 (3), pp. 821-824; Bavarian, M., Sorosuh, M., Steady-state multiplicity in a solid oxide fuel cell: practical considerations (2012) Chem. Eng. Sci., 67 (1), pp. 2-14; Campanari, S., Iora, P., Definition and sensitivity analysis of a finite volume SOFC model for a tubular cell geometry (2004) J. Power Sources, 132 (1-2), pp. 113-126; Chakrabarti, M.H., Roberts, E.P.L., Electrochemical separation of ferro/ferricyanide using a membrane free redox flow cell (2008) NED Univ. J. 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Uncontrolled Keywords: Ammonia decomposition, Ammonia fuel, Hydrogen fuel, Thermal efficiency, Transient response, Ammonia fuels, Cell lengths, Concentration polarization, Design parameters, Different sizes, Dynamic output, Electrochemical reactions, Fuel cell efficiency, Fuel cell performance, Fuel flow, Heat and mass transfer, Step changes, Tube diameters, Tubular SOFC, Ammonia, Catalyst activity, Hydrogen, Hydrogen fuels, Solid oxide fuel cells (SOFC), Transient analysis, Tubes (components), Sensitivity analysis.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 10 Jul 2013 01:23
Last Modified: 08 Nov 2017 08:50
URI: http://eprints.um.edu.my/id/eprint/7008

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