Paula Gabriella Surdi de Castro1, Vinícius Resende de Castro2, Antonio José Vinha Zanuncio3, José Cola Zanuncio4, Angélica de Cássia Oliveira Carneiro2, Jorge Gominho5, Solange de Oliveira Araújo5. 1. Departamento de Engenharia Florestal, Universidade Federal de Viçosa, Viçosa, 36570-900, Brazil. paulasurdi@gmail.com. 2. Departamento de Engenharia Florestal, Universidade Federal de Viçosa, Viçosa, 36570-900, Brazil. 3. Instituto de Ciências Agrárias, Universidade Federal de Uberlândia, Monte Carmelo, 38500-000, Brazil. 4. Departamento de Entomologia/BIOAGRO, Universidade Federal de Viçosa, Viçosa, 36570-900, Brazil. 5. Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, 1349-017, Lisboa, Portugal.
Abstract
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.
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-n class="Chemical">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.
Authors: Vinicius Resende Castro; Roger Chambi-Legoas; Mario Tommasiello Filho; Paula Gabriella Surdi; José Cola Zanuncio; Antonio José Vinha Zanuncio Journal: Sci Rep Date: 2020-02-13 Impact factor: 4.379