Scholarly record
IMPACT OF WOOD RAW MATERIALS MOVEMENT PARAMETERS ON THE ANNEALING REACTOR TORREFACTION EFFICIENCY
Abstract
The analysis of the existing approaches to instrumentation of crushed wood thermal modification technology revealed the effectiveness of having the process in disc-type annealing reactors. In order to optimize the torrefaction process in a disk reactor, a mathematical model has been developed that allows determining the required number of disks depending on the design parameters of the unit and the required degree of heat treatment of the material. Mathematical simulation showed that with the same agitator rotation rate, the required number of reactor disks increases with increasing particle size. Therefore, when carrying out heat treatment of crushed wood of various fractional composition, preliminary sorting of feedstock is required to avoid unevenness of the final treatment degree. The studies showed that an increase in the torrefaction temperature results in a significant increase in the calorific value of pellets. At the same time, the lower heat value of wood pellets heat treated without pre-sorting was 5-10% lower than the heat value of unified size pellets. In order to increase the energy efficiency of torrefied fuel pellets, it is recommended to renovate the existing disk annealing reactors by using disks with various perforation diameters with simultaneous separation of wood feedstock. In this case, the perforation diameter should decrease from the upper disks to the lower ones, while maintaining the total cross-sectional area of the perforations. Variation in the disk perforations diameter will reduce the small feedstock fractions time in the unit and lead to the adjustment of the final degree of torrefaction throughout the fractional composition of the material.
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