Elastic and Relaxation Properties of Larch Wood and Their Role in Production of Wood and Charcoal Briquettes

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UDС

676.038.14+676.038.4

DOI:

10.37482/0536-1036-2020-1-200-208

Abstract

Processing of sawdust, which accounts for 10…12 % of the volume of processed raw wood materials in products with high added value, is one of the areas of woodbiorefining. This became a premise for sawdust processing into secondgeneration biofuel, as well as carbonized briquettes based on it. The relaxation properties of larch wood are studied and their role in the technological process carried out in creation of new generation biofuel with a given set of operational properties is analyzedtaking into account the specific features of relaxation transitions at the stages of obtaining wood and charcoal briquettes.The relationship between the directed change in the relaxation state of the wood polymer components (lignin, cellulose and hemicelluloses) and the operational parameters is considered. The experimental data findings confirm that cellulose and hemicelluloses are in a high-elastic state in the initial wood and sawdust.It is advisable to ensure that the wood polymer components are transferred below the brittle temperature, in other words, wood should be dried to the lowest possible residual moisture, in order to grind wood sawdust to a powdery state with minimum energy consumption. Subsequent steam humidification to a moisture content of 3…4 % gives the system extrusion ability due to the formation of hemicellulose gel layers on the surface.

Authors

A.A. Pekarets¹, Postgraduate Student
O.A. Erokhina², Head of Laboratory
V.V. Novozhilov², Master
Yu.G. Mandre², Doctor of Engineering
E.L. Akim², Doctor of Engineering, Prof.

Affiliation

¹LLC Forest Technology Company, ul. Zvezdochka, 1, pos. Kachug, Irkutsk Region, 666210, Russian Federation; e-mail: esrplus@yandex.ru 
²Higher School of Technology and Energy of the Saint Petersburg State Technological University of Plant Polymers, ul. Ivana Chernykh, 4, Saint Petersburg, 198095, Russian Federation; e-mail: art-stones@bk.ru

Keywords

wood biorefining, larch wood, biofuel, wood briquettes, charcoalbriquettes, pellets, physical and mechanical properties, relaxation properties

For citation

Pekarets A.A., Erokhina O.A., Novozhilov V.V., Mandre Yu.G., Akim E.L. Elastic and Relaxation Properties of Larch Wood and Their Role in Production of Wood and Charcoal Briquettes. Lesnoy Zhurnal [Russian Forestry Journal], 2020, no. 1, pp. 200–208. DOI: 10.37482/0536-1036-2020-1-200-208

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Received on May 12, 2019