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Research Papers

Flexible Coproduction of Hydrogen and Power Using Internal Reforming Solid Oxide Fuel Cells System

[+] Author and Article Information
Kas Hemmes, Nico Woudstra

 Delft University of Technology, Faculty of Technology, Policy and Management, Jaffalaan 5, 2628 BX Delft, The Netherlands

Anish Patil1

 Delft University of Technology, Faculty of Technology, Policy and Management, Jaffalaan 5, 2628 BX Delft, The Netherlandsa.patil@tudelft.nl

1

Corresponding author.

J. Fuel Cell Sci. Technol 5(4), 041010 (Sep 09, 2008) (6 pages) doi:10.1115/1.2931459 History: Received November 06, 2006; Revised September 26, 2007; Published September 09, 2008

Within the framework of the Greening of Gas project, in which the feasibility of mixing hydrogen into the natural gas network in the Netherlands is studied, we are exploring alternative hydrogen production methods. Fuel cells are usually seen as the devices that convert hydrogen into power and heat. It is less well known that these electrochemical energy converters can produce hydrogen, or form an essential component in the systems for coproduction of hydrogen and power. In this paper, the coproduction of hydrogen-rich syngas (that can be converted into hydrogen) and power from natural gas in an internal reforming fuel cell is worked out by flow sheet calculations on an internal reforming solid oxide fuel cell system. The goal of this paper is to study the technical feasibility of such a system and explore its possibilities and limitations for a flexible coproduction. It is shown that the system can operate in a wide range of fuel utilization values at least down to 60% representing highest hydrogen production mode up to 95% corresponding to standard FC operation mode.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 10

Temperature of the syngas leaving the system as a function of fuel utilization for Mode 1—the high-efficiency mode

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Figure 9

Gas output composition versus fuel utilization for high-power mode

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Figure 8

Gross efficiency versus fuel utilization for high-power mode

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Figure 7

Typical cell voltage and power-density curves for a FC

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Figure 1

CYCLE TEMPO flow sheet diagram of an internal reforming SOFC system for the coproduction of hydrogen and power

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Figure 6

Gross electric power output and H2∕CO fuel output versus fuel utilization in high-power mode

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Figure 5

Gross efficiency versus fuel utilization for constant current density mode

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Figure 4

Gross electric power output and H2∕CO fuel output versus fuel utilization for constant current density mode

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Figure 3

Gross efficiency versus fuel utilization for high-efficiency mode

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Figure 2

Gross electric power output and H2∕CO fuel output versus fuel utilization for high-efficiency mode

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