An evaluation of wood/coal pellets made in a laboratory pelletizer
Chen, P.Y.S. | Haygreen, J.G. | Graham, M.A.
A laboratory pelletizer was designed and constructed to make pellets from various ratios of pulverized wood residues and coal fines. The resulting pellets were evaluated for effects of species, wood/coal ratio, and bark percentage on ram pressure requirement, physical properties, and durability (transportability). The laboratory pelletizer was suited for evaluating process variables, such as die temperature and ram pressure. Its principal limitation was lack of control of dwell time. However, it was possible to make pellets using various combinations of wood, bark, and coal without adding a binder. Pellets made with higher percentages of coal than wood in the furnish had 1) higher ram pressure requirements; 2) higher density; 3) lower moisture content (MC) immediately after manufacture; 4) lower durability; and 5) lower hygroscopicity. Pellets made with higher percentages of bark in the furnish had 1) lower ram pressure requirements; 2) higher durability; and 3) higher MC immediately after manufacture. Pellets made from oak furnish had 1) higher ram pressure requirements; 2) higher MC immediately after manufacture; and 3) lower durability than pellets made from aspen furnish.
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