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RESEARCH PAPERS

Enhanced Yield of Hydrogen From Wastes Using High Temperature Steam Gasification

[+] Author and Article Information
W. Jangsawang

 Phranakhon Rajabhat University, Bangkok, Thailand

A. Klimanek

 Silesian University of Technology, Gliwice, Poland

Ashwani K. Gupta1

 University of Maryland, Department of Mechanical Engineering, College Park, Maryland 20742

1

Corresponding author.

J. Energy Resour. Technol 128(3), 179-185 (Jul 22, 2005) (7 pages) doi:10.1115/1.2134733 History: Received February 24, 2005; Revised July 22, 2005

Equilibrium calculations using the element potential method have been used to determine optimum conditions for the gasification of wood pellets and to understand the limitations and influence of preheated gasifying agent on the product gas composition. The calculations were carried out under isobaric (1 atm) and isothermal conditions using cellulose as the waste fuel. For each isothermal case results were obtained for the effect of feed gas composition. Various mixtures of steam/cellulose [mol/mol] and oxygen/steam [mol/mol] were examined to determine conditions for high yields of H2 and CO at a given temperature. The yield of hydrogen and carbon monoxide with different input feed composition and temperature of the process are therefore considered. The results showed strong effect of temperature on hydrogen and carbon monoxide yield in the gasified product stream. High temperatures resulted in high yields of hydrogen. Pure steam resulted in higher yields of hydrogen than steam-air gasifying agent. The experimental results using a fixed bed reactor showed good trends with the calculated data. These results assist in the design and development of enhanced hydrogen production from steam gasification of wastes.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Comparison of H2 concentration yield for various oxygen/steam ratios at T=1200K

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Figure 2

Comparison of H2 and CO concentration at selected temperature for steam gasification

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Figure 3

Species concentration with gasifying agent at 800, 1200, and 1600K temperatures

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Figure 4

Hydrogen concentrations at various temperatures with steam gasification

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Figure 5

Influence of temperature on H2 concentration for different steam/cellulose ratios

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Figure 6

CO concentration at various temperatures with steam gasifying agent

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Figure 7

CH4 concentration at various gasification temperatures with steam gasifying agent

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Figure 8

Lower heating value of gasification products at various temperatures with steam gasifying agent

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Figure 9

Comparisons of H2, CO, CH4 concentration and lower heating value (LHV) of product gas for T=1200K

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Figure 10

A schematic diagram of the gasification facility

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Figure 11

A schematic diagram of the high air temperature gasification (HiTAG) facility

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Figure 12

Experimentally determined concentration of hydrogen and CO at different steam gasification temperatures

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