CURRENT UNDERSTANDING OF THE TECHNOLOGY OF INITIAL HEATING OF WOOD IN AN UNSATURATED ENVIRONMENT (REVIEW)

UDC 674.04.047.3

Rudak Oksana Gennadievna – Master of Engineering, Senior Lecturer, the Department of Technology and Design of Wooden Articles. Belarusian State Technological University (13a, Sverdlova str., Minsk, 220006, Republic of Belarus). E-mail: oksrudak@mail.ru

DOI: https://doi.org/ 10.52065/2519-402X-2023-270-2-22 (In Russian).

Key words: initial heating, heat transfer medium, heat and mass transfer, technology, drying, wood, duration.

For citation: Rudak О. G. Current understanding of the technology of initial heating of wood in an unsaturated environment (review). Proceedings of BSTU, issue 1, Forestry. Nature Мanagement. Processing of Renewable Resources, 2023, no. 2 (270), pp. 193–203. DOI: 10.52065/2519-402X-2023-270-2-22 (In Russian).

Abstract

The article presents the results of an analytical review of the scientific literature on the technology of initial heating of wood in unsaturated medium before convective drying. The analysis of the results of scientific research in the field of wood drying technology shows the existence of fundamental knowledge in the field of heat and mass transfer, which is the main theoretical basis for modeling thermal processes during the heating period, as well as predicting the dynamics of changes in the properties of lumber. It is noted that the transition to a new type of coolant, a radical change in the type of enclosure structures of timber drying chambers led to a change in the technology of the initial heating of wood. The majority of the enterprises in woodworking industry of Belarus has passed to the use of cheaper and easy-to-use heat-carrier – hot water, which supposes the carrying out of the initial heating operation at the level of the medium saturation φ at 0,8–0,85 (∆t = 2,5–3,5). It is concluded that to date there is no unified approach to the technology of initial heating in an unsaturated medium. To improve the technical and economic efficiency of the process of heating wood it is proposed to develop a mathematical model to determine the duration of this operation, establish the nature and value of the internal stress in wood, determine the energy consumption for different heating conditions, determine the impact of technological factors on the value of the temperature and humidity differences in the wood during heating, to study the nature of the thermal properties of wood in time in non-stationary conditions, establish the patterns of change.

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20.03.2023