Departamento de Engenharia Florestal, Universidade Federal de Viçosa, Viçosa, 36570-900, Brazil.
Instituto de Ciências Agrárias, Universidade Federal de Uberlândia, Monte Carmelo, 38500-000, Brazil.
Sci Rep. 2021 Mar 1;11(1):4899. doi: 10.1038/s41598-021-84296-5.
The use of wood panel residues as biomass for energy production is feasible. Heat treatments can improve energy properties while minimizing the emission of toxic gases due to thermoset polymers used in Medium Density Fiberboard (MDF) panels. Torrefaction or pre-carbonization, a heat treatment between 200 and 300 °C with low oxygen availability accumulates carbon and lignin, decreases hygroscopicity, and increases energy efficiency. The objective of this work was to evaluate the energy parameters (immediate, structural, and elementary chemical composition, moisture content, and yield) and density in torrefied MDF panels. The torrefaction improved the energetic features of coated MDF, decreasing the moisture content, volatile matter, and consequently, concentrating the carbon with better results in the samples torrefied for 40 min. The densitometric profiles of the torrefied MDF, obtained by X-ray densitometry, showed a decrease in the apparent density as torrefaction time increased. The digital X-ray images in gray and rainbow scale enabled the most detailed study of the density variation of MDF residues.
利用木屑作为生物质能源是可行的。热处理可以提高能源性能，同时最大限度地减少由于中密度纤维板（MDF）板中使用的热固性聚合物而产生的有毒气体排放。热解或预碳化是一种在 200 至 300°C 之间、氧气供应有限的热处理方法，它会积累碳和木质素，降低吸湿性，并提高能源效率。本工作的目的是评估经热解处理的 MDF 板的能量参数（即时、结构和基本化学组成、水分含量和产率）和密度。热解处理改善了涂覆 MDF 的能量特性，降低了水分含量、挥发物含量，因此，在 40 分钟的热解处理下，碳的浓缩效果更好。通过 X 射线密度计获得的经热解处理的 MDF 的密度剖面显示，随着热解时间的增加，表观密度降低。灰度和彩虹刻度的数字 X 射线图像能够最详细地研究 MDF 残余物的密度变化。
