Abstract
Rapid pyrolysis of biomass is studied using a free-fall reactor. The biomass used in the study is untreated straw and straw pellets. The results are compared with those previously obtained in pyrolysis of wood. Before pyrolysis the straw is milled, sieved and wind classified to obtain fractions of uniform particle size.
The free-fall reactor has a heated length of 2.9 m and an inner diameter of 0.04 m. The char from the rapid pyrolysis is further pyrolyzed in nitrogen atmosphere in a thermobalance with a slow heating rate (20°C/min) up to 850°C in order to obtain complete pyrolysis.
The interest in the present work is focused on the effect of the treatment conditions such as heating rate and temperature on the distribution of products, gas composition and properties of the char obtained in pyrolysis.
The product distribution in rapid pyrolysis of wood, untreated straw and pelletised straw is similar. Wood gives a little less char than straw. The higher treatment temperature has led to lower yields of tar and higher yields of gaseous products. At higher temperature, the heat flux and the heating rate are higher. The higher heating rate favours also the decrease of char yield.
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© 1997 Springer Science+Business Media Dordrecht
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Zanzi, R., Sjöström, K., Björnbom, E. (1997). Rapid Pyrolysis of Straw at High Temperature. In: Bridgwater, A.V., Boocock, D.G.B. (eds) Developments in Thermochemical Biomass Conversion. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1559-6_4
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DOI: https://doi.org/10.1007/978-94-009-1559-6_4
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