Effect of steam thermal treatment on the drying process of Eucalyptus dunnii variables

CERNE

Elias Taylor Durgante Severo²  Ivan Tomaselli¹  Fred Willians Calonego²  André Luiz Ferreira¹  Lourival Marin Mendes¹ 

[1] ,Universidade Estadual Paulista Júlio de Mesquita FilhoBotucatu São Paulo ,Brazil

关键词: Drying rate;    eucalipto;    moisture gradient;    steaming prior to drying;    Taxa de secagem;    eucalyptus;    gradiente de umidade;    vaporização preliminar à secagem;   

DOI  :  10.1590/S0104-77602013000400014

来源: SciELO

【 摘 要 】

The aim of this study was to evaluate the effect of steam treatment prior to drying on the initial moisture content, moisture gradient, and drying rate in Eucalyptus dunnii Maiden wood. Boards were steamed at 100ºC for 3 h after 1 h of heating-up. Part of these boards was dried in a drying electric oven at 50ºC, and part was dried at kiln. The results showed that the steaming prior to drying of wood: (1) significantly reduced by 9.2% the initial moisture content; (2) significantly increased by 6.2% the drying rate; (3) significantly decreased by 15.6 and 14.8% the moisture gradient between the outer layer and the center of boards and between the outer and intermediate layers of boards, respectively. Steamed boards when dried in an oven showed drying rate of 0.007065 whereas in kiln were 0.008200 and 0.034300 from green to 17 and 17 to 12% moisture content, respectively. It was demonstrated that the steaming prior to drying can be suitable for reduces the drying times of this kind of wood.

【 授权许可】

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