DYNAMICS OF CHANGE OF THERMAL PHYSICAL CHARACTERISTICS OF MILLED WOOD MATERIALS IN A SOLID WOOD DISPERSION SYSTEM UNDER PILE STORAGE

Abstract

Shredded wood materials are stored at wood processing enterprises in open areas in formed piles that have various shapes and sizes. The disadvantage of wood mass storage in this way is uncontrolled self-heating of wood chips to critical temperatures under the influence of thermophilic microorganisms. In the absence of proper control over the self-heating process, the useful mass of wood is lost, its quality is significantly deteriorated and there is a risk of wood burning. It is necessary to remove excess thermal energy from the array of ground wood material to prevent negative consequences. The purpose of the work is to study the dynamics of quantitative indicators of the thermophysical characteristics of chopped wood materials (wood chips, sawdust, shavings, and bark) in an environment of bulk pile during storage. During the work, standard thermal analysis methods have been used. The studies have been carried out in the laboratory of fire and technical expertise of building and finishing materials and the central design department of Common Use Center "Arctic", Northern (Arctic) Federal University named after M.V. Lomonosov. As a result, a mathematical description of the dependence of the coefficients of thermal conductivity and heat capacity of ground wood materials on humidity and temperature, numerical values of the temperatures of smoldering, ignition and self-ignition of technological wood chips, sawdust, screenings from wood chips and bark has been obtained. The results of experimental studies are used to simulate heat and mass transfer processes in the objects of storage of crushed wood and to improve the technology of safe storage of technological chips.