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The aim of this study was to evaluate the effect of genetic material and the planting location on charcoal produced from eucalyptus wood from short rotation systems. It was evaluated five clones of Eucalyptus sp. from three municipalities of the state of Minas Gerais. Wood chip samples were charred in electric oven muffle, with heating rate of 1.67 °C/min and evaluated the following parameters of the resulting carbon: Yield charcoal, Proximate composition (fixed carbon, volatiles matter and ash), Density apparent and Higher heating value. Was noted that both variables - genetic material and planting location - had a significant effect on yield charcoal, in proximate composition and higher heating value. Already the coal density was not affected by any of the two variables. The yield and density were below the values reported in the literature for coal produced under the same laboratory conditions, with wood from conventional systems with older cut. In general, it can be observed the importance of assessing the potential for the production of coal individually. Furthermore, it was shown that clones of Eucalyptus spp. from short rotation systems are less suitable for charcoal production than conventional systems. [ABSTRACT FROM AUTHOR]

The pellets are becoming an important renewable source of energy for industrial and domestic use. The consumer market is increasingly demanding in terms of product quality and this may be improved through the use of various additives, such as kraft lignin. The objective of this study was to evaluate the quality of eucalyptus pellets produced with the addition of different percentages of kraft lignin. The raw material used for production of pellets was wood with bark of an Eucalyptus grandis x E. urophylla clone, with approximately five years of age, obtained from commercial planting, and 10% of waste of eucalyptus harvest (tops, leaves and branches). Excluding the control (0% lignin) was added 1, 2, 3, and 5% kraft lignin, relative to the dry mass of raw material. The pellets were produced in a laboratory pelletizer with a horizontal circular array. The following properties of the pellets were evaluated: moisture content, gross and net calorific value, unit density, bulk density, energy density, ash content, length and diameter, hardness, mechanical durability and fines content. The addition of kraft lignin contributed to improving the pellets physical and mechanical properties, as regards the density, mechanical durability, fines and hardness. The addition of lignin caused the elevation of the levels of ash and moisture content of the pellets. It is concluded that addition of lignin to pellet production is feasible, since lignin is used with lower contents of ash and moisture. [ABSTRACT FROM AUTHOR]