林业工程学报2018，Vol.3Issue(4)：25-29,5.DOI:10.13360/j.issn.2096-1359.2018.04.004
高温热处理对欧洲云杉和花旗松吸湿特性的影响
Sorption isotherms characteristics of high temperature heat-treated Picea abies and Pseudotsuga menziesii
摘要
Abstract
The effects of high temperature heat treatment on the equilibrium moisture content and sorption isotherms characteristics of Picea abies and Pseudotsuga menziesii were studied in this paper. In this study water vapor was em-ployed as protective medium and the four heat treatment temperatures were pre-set, which were 160℃, 180℃, 200℃ and 220 ℃, respectively. The sorption experiments were performed in the two-chamber setup, the relative humidity of air was controlled by eight kinds of salt solutions and the air temperature of sorption experiments were constantly 25℃ during the whole isothermal adsorption process. The sorption isotherms of high temperature heat-trea-ted wood were fitted by the Guggenheim-Anderson-deBoer ( GAB) equation. The effects of high temperature heat treatment on the isothermal adsorption curve type, equilibrium moisture content and effective specific surface area were analyzed. The equilibrium moisture content of wood could be significantly reduced by the high temperature heat treatment, and the higher the treatment temperature, the greater the decreasing in the equilibrium moisture content. The equilibrium moisture content of the samples after 220 ℃ heat treatment were more than 40% lower than that of untreated samples. The GAB equation could be used to describe the isothermal adsorption curve of the high tempera-ture heat treatment of wood, and the fitting accuracy is fairly high (R2＞0.98 for all the samples). The isothermal ad-sorption linetype of wood did not be changed by the high temperature treatment. Both the high temperature heat treated samples and untreated samples exhibited the typeⅡisothermal adsorption linetype, but the slope of samples could be influenced by heat treatment. The effective specific surface area of the two species significantly reduced after heat treatment, and the higher the temperature, the more obvious the specific surface area decreases. The influence of the high temperature heat treatment on the decline proportion of the effective surface area were similar to the decline pro-portion of the equilibrium moisture content. The research results could be used for scientific evaluation of moisture ad-sorption characteristics of wood and the relevant data also could be utilized as a reference in actual wood high tempera-ture heat treatment production.关键词
欧洲云杉/花旗松/木材吸附特性/高温热处理/等温吸附/GAB模型/比表面积Key words
Picea abies/Pseudotsuga menziesii/wood sorption characteristics/high temperature heat treatment/sorp-tion isotherms/GAB model/specific surface area分类
农业科技引用本文复制引用
高鑫,周凡,付宗营,周永东..高温热处理对欧洲云杉和花旗松吸湿特性的影响[J].林业工程学报,2018,3(4):25-29,5.基金项目
中央级公益性科研院所基本科研业务专项(CAFYBB2017ZC003) （CAFYBB2017ZC003）
国家林业公益性行业科研专项(201404502). （201404502）
