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Kinetic Parameters of Wood Drying Process

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M.G. Ermochenkov

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Heat treatment is widely used to modify the mechanical, physical and chemical, thermophysical, biological and other properties of wood. Drying is one of the types of thermal impact. We should develop mathematical models of the processes occurring in wood under thermal action to determine the optimal modes of drying and minimize energy costs. The author faces a task of describing internal heat and mass sources to make the mathematical descriptions of heat and mass transfer during drying. The moisture removal is regarded as a complex multi-stage physicochemical process. The stage of the drying process is due to the moisture in wood, connected with wood substance. The destruction of bonds occurs in their (different) temperature ranges. Individual stages are considered as parallel, independent chemical reactions and are described by kinetic equations. We develop and produce an experimental plant to study the kinetics of bound moisture removal in wood. This unit allows conducting thermogravimetric experiments in a controlled humidity environment. Samples for the study have different initial humidity at different environmental relative humidity. The results of thermogravimetric experiments are processed using a method separating the process into the stages. The bound moisture removal from wood proceeds in seven stages. For each stage, we determine the activation energy, the pre-exponential factor, and the initial mass fraction values. The dependence of kinetic parameters on the environmental relative humidity is studied. The author assumes that only the activation energy depends on the humidity of the drying agent. Empirical dependences of the activation energy on the environmental relative humidity for the first, second and third stages are obtained; thermogravimetric studies of the drying kinetics of wood with an initial moisture exceeding the fibre saturation point, i.e. in the presence of free moisture are undertaken; stepwise kinetic parameters are established.


M.G. Ermochenkov, Candidate of Engineering Sciences, Associate Professor


Mytishchi Branch of Bauman Moscow Stade Technical University, ul. Pervaya Institutska-ya, 1, Mytishchi, Moscow oblast, 141005, Russian Federation;


wood drying, drying kinetics, thermogravimetric study, kinetic parameter, environmental relative humidity

For citation

Ermochenkov M.G. Kinetic Parameters of Wood Drying Process. Lesnoy zhurnal [Forestry journal], 2017, no. 6, pp. 114–125. DOI: 10.17238/issn0536-1036.2017.6.114


1. Ermochenkov M.G., Evstigneev A.G., Kuvik T.E. Termogravimetricheskie issledovaniya kinetiki termicheskoy sushki drevesiny [Thermogravimetric Research of the Kinetics of Thermal Drying of Wood]. Nauchnye trudy Moskovskogo gosudarstvennogo universiteta lesa [Works of Moscow State Forest University], 2007, iss. 335, pp. 36?46.
2. Ermochenkov M.G., Semenov Yu.P. Matematicheskaya model' protsessov, protekayushchikh v drevesine pri intensivnoy sushke [Mathematical Model of the Processes Occurring in Wood when Intensive Drying]. Stroenie, svoystva i kachestvo drevesiny: tr. IV Mezhdunar. simp. [The Structure, Properties and Quality of Wood: Proc. 4th Inter. Symp.]. Saint Petersburg, SPbSFTA Publ., 2004, pp. 530?533. (In Russ.)
3. Ermochenkov M.G., Semenov Yu.P., Evstigneev A.G., Kuvik T.E. Vliyanie otnositel'noy vlazhnosti vozdukha v porakh drevesiny na energiyu aktivatsii paroobrazovaniya pri intensivnom nagreve [The Effect of Relative Air Humidity in the Wood Pores on the Activation Energy of Evaporation under Intense Heating]. Tekhnologiya i oborudovanie dlya pererabotki drevesiny: nauchnye trudy Moskovskogo gosudarstvennogo universiteta lesa [Technology and Equipment for Wood Processing: Works of Moscow State Forest University], 2008, iss. 342, pp. 9?13. (In Russ.)
4. Sergovskiy P.S., Rasev A.I. Gidrotermicheskaya obrabotka i konservirovanie drevesiny [Hydrothermal Treatment and Preservation of Wood]. Moscow, Lesnaya promyshlennost' Publ., 1987. 360 p. (In Russ.)
5. Chudinov B.S. Voda v drevesine [Water in Wood]. Novosibirsk, Nauka Publ., 1984. 270 p. (In Russ.)
6. Shvedov B.A. Energo- i massoobmen v materialakh teplovoy zashchity mnogorazovykh raketno-kosmicheskikh sistem: dis. … d-ra tekhn. nauk [Energy and Mass Transfer in Thermal Protection Materials of Reusable Space-Rocket Systems: Dr. Eng. Sci. Diss.]. Moscow, 1990. 542 p.
7. Collignan A., Nadeau J.P., Puiggali J.R. Description and Analysis of Timber Drying Kinetics. Drying Technology, 1993, vol. 11, iss. 3, pp. 489?506.
8. Dincer I. Moisture Loss from Wood Products During Drying ? Part I: Moisture Diffusivities and Moisture Transfer Coefficients. Energy Sources, 1998, vol. 20, iss. 1, pp. 67?75.
9. Fyhr C., Rasmuson A. Mathematical Model of Steam Drying of Wood Chips and Other Hygroscopic Porous Media. Aiche Journal, 1996, vol. 42, iss. 9, pp. 2491?2502.
10. Pang S., Haslett A.N. The Application of Mathematical Models to the Commercial High-Temperature Drying of Softwood Lumber. Drying Technology, 1995, vol. 13, iss. 8-9, pp. 1635?1674.
11. Peters B., Bruch C. Drying and Pyrolysis of Wood Particles: Experiments and Simulation. Journal of Analytical and Applied Pyrolysis, 2003, vol. 70, iss. 2, pp. 233?250.
Received on February 13, 2016

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