Abstract
For the first time, a mathematical model for the drying of woody biomass during conductive heating with localization of the evaporation front has been formulated. The processes of moisture removal during the filtration of steam through the porous structure of the material at an ambient temperature of Te = 373 K were considered. Humidity was varied (in the range from 6% to 40%) and dimensions of wood blanks (Rd = 0.0035 - 0.035 m). Based on the results of numerical simulation, the conditions and characteristics (evaporation rate Wisp, drying time τ dry) of the process of moisture removal from wood biomass are determined. The mathematical model allows to calculate the drying time, as well as the mass evaporation rate for different sizes of wood sample, humidity and temperature conditions.
Highlights
The use of wood waste in the energy sector is ecologically and energy-efficient [1]
It is established that the dimensions of the wood biomass preform have a significant effect on drying characteristics
An increase in the radius of the wood billet by a factor of 10 at a humidity of 40% leads to a significant extension of the drying period. This is due to the fact that as a result of moisture removal a porous layer of dry material with high thermal resistance is formed
Summary
The use of wood waste in the energy sector is ecologically and energy-efficient [1]. The latter is because that the wood biomass is carbon-neutral, the sulfur and nitrogen content in the wood is lower than the traditional solid (coal) [2], liquid (oil, fuel oil) and gaseous (natural gas) energy carriers [3, 4].Progress in wood drying technologies is possible by studying the regularities of heat and mass transfer processes [5]. Many of physical and structural factors that find the result of intense thermal effects on wood make it impossible to study the mechanism of drying experimentally. For this reason, the most acceptable at this stage in the development of the theory and practice of the drying of moist wood biomass is the use of the apparatus of mathematical modeling. Application of the statement [7] is possible only when studying the processes of moisture removal in bodies possessing axial symmetry (a cylinder, a ball) In this case, it is impossible to consider the real configuration of the body under conditions of uneven surface heating
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