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Do you know the effect of sawdust granulator on raw material granulation?

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The results show that the impermeability and hygroscopicity of the formed particles are closely related to the particle size. The smaller the particle size, the larger the specific surface area, the easier the hygroscopicity and moisture regain of the formed particles. On the contrary, the smaller the particle size, the easier the filling of the interstitial voids and the greater the compressibility of the formed particles, which make the residual of the formed particles. The internal stress decreases, which weakens the hydrophilicity of the formed particles and improves the impermeability.

In the study of particle deformation and bonding forms in compression moulding of vegetable materials, particle mechanical engineers observed the particles inside the moulding block under microscope and measured the two-dimensional average diameter of particles, and established a particle micro-bonding model. It is believed that in the direction perpendicular to the principal stress, the particles extend to all directions and the particles interact with each other. In the direction of the principal stress, the particles become thin and thin, and the layers of particles are combined in the form of interlocking.

According to the combined model, the softer the particles of biomass raw materials are, the larger the two-dimensional average diameter of particles is, and the easier the biomass is to be compressed. When the moisture content in plant materials is too low, the particles can not be fully extended and bonded with the surrounding particles, so they can not be formed; when the moisture content is too high, although the particles extend sufficiently perpendicular to the direction of the principal stress, the particles can mesh, but due to the more water in the raw materials is extruded, they are distributed in the particles. Between the sub-layers, the particles can not be closely adhered to each other, so they can not be formed.

CONCLUSION: The particle size of biomass granules should not be too large or too small. According to the experience data, the specially appointed engineer concluded that it is better to control the particle size of biomass granules at one third of the die aperture.


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