Fine grinding of wood : overview from wood breakage to applications
Karinkanta, Pasi; Ämmälä, Ari; Illikainen, Mirja; Niinimäki, Jouko (2018-03-23)
Pasi Karinkanta, Ari Ämmälä, Mirja Illikainen, Jouko Niinimäki, Fine grinding of wood – Overview from wood breakage to applications, Biomass and Bioenergy, Volume 113, June 2018, Pages 31-44, ISSN 0961-9534, https://doi.org/10.1016/j.biombioe.2018.03.007.
© 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).
Due to its abundance, wood is the pre-eminent lignocellulosic raw material for a sustainable bioeconomy based society. Wood is widely used as fuel, construction material, and raw material in cellulose and lignocellulose based products. Besides the established uses of wood powder, like co-firing with coal and biofuel production, there are also novel uses and process applications, e.g., advanced wood-plastic composites and biochemical production are emerging for which the pulverization or fine grinding of wood is an essential pre-treatment step. Due to the tenacious nature of the wood matrix, size reduction is an energy intensive process and thermal or chemical pre-treatment may be needed to improve economy.
This paper provides a broad overview of the fine grinding of wood. First, wood breakage mechanisms and the mechanisms of size reduction are presented, followed by fine grinding techniques and wood pre-treatment methods. A comparison of the specific energy consumption of wood fine grinding in both a gaseous and liquid environment is illustrated. Additionally, examples are given of the role played by pre-treatment methods in decreasing energy consumption. The particle aspect ratio is discussed briefly. Finally, the use and requirements of wood powders in various applications are discussed.
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