Stability to thermal degradation and chemical composition of woody biomass subjected to the torrefaction process

作者：Simoes da Silva Carlos Miguel; Oliveira Carneiro Angelica de Cassia; Corradi Pereira Barbara Luisa; Vital Benedito Rocha; Nogueira Alves Isabel Cristina; de Magalhaes Mateus Alves

来源：Holz als Roh- und Werkstoff, 2016, 74(6): 845-850.

DOI：10.1007/s00107-016-1060-z

The aim of this study was to describe the stability to thermal degradation and the chemical composition of woody biomass which was subjected to the torrefaction process. Particles of eucalyptus wood were thermally treated in a rotary roaster heated at a rate of 5 A degrees C/min. The final heating temperatures were 170, 220 and 260 A degrees C and residence time was equal to 15 min after the desired temperature was achieved. An increase in the stability of thermal degradation of eucalyptus wood was observed when submitted to the torrefaction process. In the thermogravimetric analysis, torrefied wood had higher residual mass percentage with lower mass loss rates. Torrefaction promoted an increase in lignin from 32.7 % of the untreated samples to 52.2 % of the 260 A degrees C heated samples. Furthermore, there was an increase in elemental carbon content from 47.4 to 54.1 %. These increases are due to elimination of a polysaccharide fraction of biomass, especially hemicelluloses. In general, the temperature increased carbon-oxygen ratio of biomass. It was concluded that the torrefaction improves the characteristics of biomass for energy purposes.

• 出版日期2016-11