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Research Papers

Study on Preheating Techniques for Start-up of Tubular Solid Oxide Fuel Cells

[+] Author and Article Information
Amin Mirahmadi

Department of Mechanical Engineering,  Iran University of Science and Technology, Narmak, Tehran, Iran 1684613114

Kia Valefi

Department of Mechanical Engineering,  Iran University of Science and Technology, Narmak, Tehran, Iran 1684613114kiavalefi@iust.ac.ir

J. Fuel Cell Sci. Technol 8(6), 061008 (Sep 26, 2011) (7 pages) doi:10.1115/1.4004504 History: Received December 16, 2010; Revised June 28, 2011; Published September 26, 2011; Online September 26, 2011

For start-up of tubular solid oxide fuel cells preheating concepts of gas heating, induction heating, sequential hybrid of gas and induction heating and concurrent hybrid of gas and induction heating were experimented. Due to impossibility of heating-up of porous electric conductive layers in electromagnetic field, stainless steel material was adopted for the gas distributor tube, which is readily heated by induction method and transfers heat to adjacent layers. Start-up times of 95, 31, 49 and 20 seconds were attained for gas heating, induction heating, hybrid of sequential gas and inductive heating and hybrid of concurrent gas and induction heating methods respectively. Axial distribution of temperature in the course of start-up was steadier in hybrid methods which resulted in diminished axial temperature gradient and reduced performance degradation of the cell. A numerical model was developed and calibrated to predict the preheating phenomenon. Analytical results implied the positive effect of layers porosity on the heating rate, concerning mainly the gas heating methods.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Manufacturing process of tested MT-SOFC sample

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Figure 2

The gas heating start-up setup

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Figure 3

Induction heating start-up setup (outer casing removed)

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Figure 4

Electrical conductivity of type 420 stainless steel gas distributor versus temperature [14]

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Figure 5

Heating rates at the mid-length of the tubular SOFC for various start-up methods

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Figure 10

Numerical results of heating rates of tubular SOFC with various porosities

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Figure 9

Numerical and experimental results of temperature distribution in the cell experiencing concurrent gas and induction heating

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Figure 8

Numerical and experimental results of temperature distribution in the cell experiencing sequential gas and induction heating

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Figure 7

Numerical and experimental results of temperature distribution in the cell experiencing induction heating

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Figure 6

Numerical and experimental results of temperature distribution in the cell experiencing gas heating

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