Permeability of wood pellets in the presence of fines
2010
Yazdanpanah, F. | Sokhansanj, S. | Lau, A.K. | Lim, C.J. | Bi, X. | Melin, S. | Afzal, M.
Broken pellets and fines are produced when pellets are handled. The resistance to air flow was measured for clean pellets and for pellets mixed with 1-20% broken pellets (fines). A pellet diameter was 6mm. The lengths ranged from 6 to 12mm. Clean pellets were defined as particles that remained on a 4mm screen. A typical sieve analysis showed 30% of the mass of particles that passed through the 4mm screen was smaller than 1mm. The airflow rates used in the experiment ranged from 0.004 to 0.357ms⁻¹. The corresponding pressure drop ranged from 1.9 to 271Pam⁻¹ for clean pellets, from 4.8 to 1100Pam⁻¹ for 10% fines content, and from 7.9 to 1800Pam⁻¹ for 20% fines content. Coefficients of Hukill and Ives' equation were estimated for clean pellets and a multiplier was defined to calculate pressure drop for pellets mixed with fines.
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