Operating Microtubular SOFCS With Hydrogen Chloride and Hydrogen Sulfide Containing Fuels and Synthetic Wood Gas

[+] Author and Article Information
Gerhard Buchinger

Department of Eco:Energy Engineering, Upper Austrian University of Applied Sciences, Stelzhamerstraße 23, A-4600 Wels, Austria and Chair for Physical Chemistry,  University of Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austriag.buchinger@fh-wels.at

Paul Hinterreiter, Thomas Raab, Stefan Griesser, Dieter Meissner

Department of Eco:Energy Engineering, Upper Austrian University of Applied Sciences, Stelzhamerstraße 23, A-4600 Wels, Austria

Richard Claassen, Dirk Peter Claassen

 ALPPS Fuel Cell Systems GmbH, Exerzierplatzstraße 4, A-8051 Graz, Austria

Werner Sitte

Chair of Physical Chemistry, University of Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria

J. Fuel Cell Sci. Technol 3(3), 280-283 (Feb 09, 2006) (4 pages) doi:10.1115/1.2205361 History: Received December 01, 2005; Revised February 09, 2006

Solid oxide fuel cells are known to be able to handle a large variety of different fuels. Because of the greenhouse effect the use of carbon dioxide neutral gases or liquids are of special interest. In this context wood-gas has a big potential to be an alternative fuel for solid oxide fuel cells (SOFCs). The gas is generated by a fluidized bed steam gasifier and consists of various components such as 25 Vol % carbon monoxide, 20 Vol % carbon dioxide, 10 Vol % methane, 2.5 Vol % ethylene, 0.5 Vol % propylene, 2 Vol % nitrogen, and the rest hydrogen (values in dry state). The water concentration of the original pyrolysis gas is about 35 Vol %. Besides these main ingredients there are of course many impurities like dust, tars, ammonia, hydrogen sulphide, and hydrogen chloride present in the product gas. Especially the last two ones may lead to degeneration of the fuel cell anode and must therefore be almost totally removed before feeding the gas into the cell. In order to reduce energy losses, hot gas cleaning systems are favored. This, however, limits the possibility to reduce the impurity concentrations to very low levels. Therefore the aim of this work is to define the maximum acceptable output concentrations for the hydrogen chloride adsorber also in combination with hydrogen sulphide, since for a micro-tubular SOFC there are as yet hardly any data available. In order to determine the influence of the hydrogen chloride on the performance of the fuel cell, different concentrations of this impurity were fed to the cell. Here, also the flow rate was changed while the electrochemical output was determined. In addition it was analyzed if there were any effects when changing from pure hydrogen to the HCl containing fuel. This was investigated at 1123 K and 1173 K, which are the preferred working temperatures for our cells. Cooling down as well as heating up procedures were tested with cells between 1173 K and 573 K. In a second series of experiments, combinations of hydrogen chloride and hydrogen sulphide of variable concentrations were tested. As before, changing between pure hydrogen and the acid containing fuel at above given temperatures was analyzed by determining the cell performance. In parallel to the above experiments, synthetic wood gas was used for operating the microtubular fuel cell while monitoring the electrochemical output with time.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Experimental setup

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Figure 5

Cell performance of a cell operated with synthetic wood gas

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Figure 4

SOFC performance at 1173K in the presence of 3ppm hydrogen sulfide and 5∕10ppm hydrogen chloride in dry hydrogen

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Figure 3

Alternating operation with pure and dry hydrogen and 0.2ppmH2S∕5ppmHCl in dry hydrogen

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Figure 2

Typical performance of the SOFC with 100mlN∕min47.4ppmHCl in dry hydrogen at 1173K



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