Shchupakivskyу R. Regularities of Oak wood thermal treatment in carbon dioxide environment.

Object of research - technology of oak wood thermal treatment in carbon dioxide environment. The objective - based on theoretical and experimental investigations, determinate the main regularities of unsteady moisture transport and temperature distribution in oak wood during heat treatment in carbon dioxide environment; justify selection of process parameters, enunciate the basic principles of process parameters development under thermal modification. Methods of investigation - analytical methods of mathematical physics, the finite element method; experimental: weighing, contact thermometry, high-frequency densitometry; methods of statistical analysis. Scientific novelty. Based on the theoretical and experimental research, following results of research have been obtained: mathematical model, for simultaneous heat and mass transfer taking place during the high temperature treatment of wood in carbon dioxide environment, has been developed, taking into account the peculiarities of carbonic acid using as a processing environment. First time to determine the density of oak wood due to thermal treatment high-frequently method have been used, that's allows to perform investigations of density variations within annual gain in a single sample before and after thermal treatment. An adequate regression model due to the influence of thermal modification parameters have been obtained. Received results made it possible to predict the changes in mechanical properties of thermally modified wood as well as it's thermal performance. The main regularities of operating parameters, dimensional characteristics of the porous media, its initial moisture content, and type of modification medium have been determined on the process of heat treatment. New operating condition for oak wood thermal modification in CO2, ensuring the requirements of qualitative material, have been developed. Consequently, were formulated the practical recommendations and basic principles for the regulation of operating parameters of the heat treatment, taking into account the staging of its passage, which allow the creation of adaptive automatic control system. Practical importance. Results of research can prove at the scientific level, and establish main regularities of oak wood thermal treatment in an inert environment of carbon dioxide. Generalized results of modeling and simulation were incorporated into thermo-chamber control systems, providing relationships between measured values and important kiln performance parameters. Based on the terms of conformity for manufactured products, to specify indicators of quality and energy efficiency of technology, permissible level of modifying operating parameters have been fixed. Modes for oak heat treatment in carbon dioxide environment have been developed and proven practice at the "AMS Elektronik" Sp.z o.o (Poland). Field of application - woodworking.