Evaluation of Screenig and Drying as Process Steps to Improve Fuel Properties of Low Quality Wood Chips for the Use in Small-scale Gasifier-CHP Plants
Lesche, S., Kuptz, D., Zeng, T., Pollex, A., Kuffer, G., Mühlenberg, J., Hartmann, H.
Small-scale wood gas CHP plants might strongly contribute to the energy transition from fossil fuels to renewable energies. Currently, raw material assortments of high quality such as stemwood are usually combusted in these plants. In the future, increasing shares of low quality fuels from circular or cascade use will have to be gasified. These fuels can cause problems for failure-free plant operation due to their high fuel heterogeneity and their lower chemical and physical fuel properties. In this study, three different supply chains for processing low quality wood chips by screening and drying were investigated. Processing was tested with wood chips from forest calamities and from road side maintenance. Without processing, fuels were unsuitable for combustion in small-scale wood gas CHP plants due to high moisture contents (> 42 w-%) and exceeding particle length. After processing, moisture content, ash content and the fine and coarse particle fractions were reduced. Upgraded fuels were applied in three commercially installed wood gas CHP plants. Thereby, results indicate that a decrease of moisture content, ash content and the fine particle fraction can lead to an increase in electrical efficiency.
gasification, upgrading, wood chips, fuel quality, combined heat and power generation (CHP)
Biomass Conversion Technologies for Heating, Cooling and Electricity
Production and supply of solid fuels and intermediates
27th European Biomass Conference and Exhibition
1004 - 1008
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