High temperature steam-only gasification of woody biomass
We have studied a high temperature steam gasification process to generate hydrogen-rich fuel gas from woody biomass. In this study, the performance of the gasification system which employs only high temperature steam exceeding 1200Â K as the gasifying agent was evaluated in a 1.2 ton/day-scale demonstration plant. A numerical analysis was also carried out to analyze the experimental results. Both the steam temperature and the molar ratio of steam to carbon (S/C ratio) affected the reaction temperature which strongly affects the gasified gas composition. The H2 fraction in the produced gas was 35-55 vol.% at the outlet of the gasifier. Under the experimental conditions, S/C ratio had a significant effect on the gas composition through the dominant reaction, water-gas shift reaction. The tar concentration in the produced gas from the high temperature steam gasification process was higher than that from the oxygen-blown gasification processes. The highest cold gas efficiency was 60.4%. However, the gross cold gas efficiency was 35%, which considers the heat supplied by high temperature steam. The ideal cold gas efficiency of the whole system with heat recovery processes was 71%.
Year of publication: |
2010
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Authors: | Umeki, Kentaro ; Yamamoto, Kouichi ; Namioka, Tomoaki ; Yoshikawa, Kunio |
Published in: |
Applied Energy. - Elsevier, ISSN 0306-2619. - Vol. 87.2010, 3, p. 791-798
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Publisher: |
Elsevier |
Keywords: | Steam gasification High temperature steam Woody biomass Hydrogen |
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