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Method for online measurement of the CHON composition of raw gas from biomass gasifier

Author

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  • Neves, Daniel
  • Thunman, Henrik
  • Tarelho, Luís
  • Larsson, Anton
  • Seemann, Martin
  • Matos, Arlindo

Abstract

For unattended biomass gasification processes, rapid methods for monitoring the elemental composition (CHON) of the raw gas leaving the gasifier are needed. Conventional methods rely on time-consuming and costly laboratory procedures for analysing the condensable part of the raw gas. An alternative method, presented in this work, assesses the CHON composition of raw gas in a “one step” analysis without the need to previously characterise its chemical species composition. Our method is based on the quantitative conversion of a raw gas of complex chemical composition into CO2, H2O, and N2 in a small combustor. The levels of these simple species can be measured with high accuracy and good time resolution, and the CHON composition of the raw gas can be determined from the mass balance across the combustor. To evaluate this method, an online combustion facility was built and used to analyse the raw gas from the Chalmers 2-MWth dual fluidised bed steam gasifier. Test runs of the developed facility demonstrated complete combustion of the raw gas and the measurements were both fast and reliable. The new method used in combination with zero-dimensional reactor modelling provides valuable data for the operational monitoring of gasification processes, such as the degree of fuel conversion, composition of the char exiting the gasifier, oxygen transport by catalytic bed material, and amount of condensables in raw gas.

Suggested Citation

  • Neves, Daniel & Thunman, Henrik & Tarelho, Luís & Larsson, Anton & Seemann, Martin & Matos, Arlindo, 2014. "Method for online measurement of the CHON composition of raw gas from biomass gasifier," Applied Energy, Elsevier, vol. 113(C), pages 932-945.
  • Handle: RePEc:eee:appene:v:113:y:2014:i:c:p:932-945
    DOI: 10.1016/j.apenergy.2013.08.032
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    References listed on IDEAS

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    1. Göransson, Kristina & Söderlind, Ulf & He, Jie & Zhang, Wennan, 2011. "Review of syngas production via biomass DFBGs," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(1), pages 482-492, January.
    2. Al-attab, K.A. & Zainal, Z.A., 2011. "Design and performance of a pressurized cyclone combustor (PCC) for high and low heating value gas combustion," Applied Energy, Elsevier, vol. 88(4), pages 1084-1095, April.
    3. Font Palma, Carolina, 2013. "Modelling of tar formation and evolution for biomass gasification: A review," Applied Energy, Elsevier, vol. 111(C), pages 129-141.
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