Influence of the Relative Length of the Matrix Drawplate on the Compacting Pressure of Thermally-Modified Birch Bark in the Roller Press-Granulators

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UDС

UDС 674.812

DOI:

10.17238/issn0536-1036.2017.5.110

Abstract

The process of obtaining of granulated biofuel from thermally-modified woodpulp by roller press granulators is a promising method for utilization of birch bark refuse wood. Density of bark pellets is an important indicator, of their high quality. The production of qualitative pellets from thermally-modified birch bark depends on the compacting pressure, which is directly associated with the relative length of the matrix drawplate and feedstock physical and mechanical properties, primarily with the friction and adhesion coefficients of the pressed wood pellet with the cylindrical surface of the matrix drawplate in the roller press granulators. At present, there are practically no data on the adhesion and friction coefficients for thermally-modified tree bark, which does not allow us to determine the pressure developed by the pressing rolls during the wood pellets pressing. Based on the developed mathe-matical model for calculating the compacting pressure in the cylindrical matrix drawplate, we combined the friction and adhesion coefficients into a factor, which made it possible to create a stand and develop a technique for its experimental determination. The researches on obtaining granules from thermally-modified birch bark demonstrate that the generalizing coefficient a is a function of initial moisture content of thermally-modified raw material and compacting pressure. The statistical processing of the experimental results made it possible to obtain a regression equation for the determining coefficient a.

Authors

O.D. Myuller, Doctor of Engineering Sciences, Professor
V.I. Melekhov, Doctor of Engineering Sciences, Professor
N.G. Ponomareva, Postgraduate Student
T.V. Tyurikova, Candidate of Engineering Sciences, Associate Professor

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation; е-mail: ockar@mail.ru, n.ponomareva@narfu.ru

Keywords

granulation, thermally-modified, birch bark, fine mass, press-granulator, pellet, compacting pressure

For citation

Myuller O.D., Melekhov V.I., Ponomareva N.G., Tyurikova T.V. Influence of the Relative Length of the Matrix Drawplate on the Compacting Pressure of Thermally-Modified Birch Bark in the Roller Press-Granulators. Lesnoy zhurnal [Forestry journal], 2017, no. 5, pp. 110–118. DOI: 10.17238/issn0536-1036.2017.5.110

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Received on March 25, 2017