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Dual fluidized bed steam gasification: Change of product gas quality along the reactor height

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  • Mauerhofer, A.M.
  • Schmid, J.C.
  • Benedikt, F.
  • Fuchs, J.
  • Müller, S.
  • Hofbauer, H.

Abstract

The impact of the counter-current column of the gasification reactor of a 100 kWth dual fluidized bed steam gasification pilot plant on the product gas quality was investigated. Through the advanced design of the gasification reactor by operating the lower part as bubbling bed and the upper part as counter-current column, the gas-solid interactions between downward flowing hot bed material particles with upwards flowing product gas could be enhanced. This was realized by equipping the counter-current column with constrictions, which increase the residence time and the bed material hold-up. Thus, the conversion efficiency of the fuel including the tar was improved. For the investigations three different experimental campaigns converting softwood pellets using a mixture of olivine and limestone (50/50 wt.-%), a mixture of feldspar and limestone (50/50 wt.-%), and 100 wt.-% quartz as bed materials were conducted. Higher H2 contents and lower contents of higher hydrocarbons could be detected along the height of the counter-current column. Especially heavy tar compounds could be reduced significantly. These two effects are explained by enhanced water gas shift and steam reforming reactions. In case of catalytically inactive quartz, only thermal effects are available and therefore lower effects on tar reduction could be obtained.

Suggested Citation

  • Mauerhofer, A.M. & Schmid, J.C. & Benedikt, F. & Fuchs, J. & Müller, S. & Hofbauer, H., 2019. "Dual fluidized bed steam gasification: Change of product gas quality along the reactor height," Energy, Elsevier, vol. 173(C), pages 1256-1272.
    • Handle: RePEc:eee:energy:v:173:y:2019:i:c:p:1256-1272
    DOI: 10.1016/j.energy.2019.02.025
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    References listed on IDEAS

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    1. Mauerhofer, A.M. & Benedikt, F. & Schmid, J.C. & Fuchs, J. & Müller, S. & Hofbauer, H., 2018. "Influence of different bed material mixtures on dual fluidized bed steam gasification," Energy, Elsevier, vol. 157(C), pages 957-968.
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    5. Benedikt, F. & Schmid, J.C. & Fuchs, J. & Mauerhofer, A.M. & Müller, S. & Hofbauer, H., 2018. "Fuel flexible gasification with an advanced 100 kW dual fluidized bed steam gasification pilot plant," Energy, Elsevier, vol. 164(C), pages 329-343.
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