Thermal deterioration of wood.
Thermal deterioration of wood.
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DOI：
10.1021/bk-1977-0043.ch005
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
F. Shafizadeh;Chin P.P.S.
中科院分区：
文献类型：
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作者：
F. Shafizadeh;Chin P.P.S.
当木材在高温下加热时，由于其成分的化学变化，它将显示出永久性的强度损失。如果将木材加热较长时间，则热分解可在100°C以下开始。图1显示，在120°加热的木材在大约一个月内会失去10%的强度，但如果在140°加热，只需要一周的时间就会失去同样的强度。在更高的温度下加热会产生挥发性分解产物和烧焦的残留物。热解反应和热解产物控制着燃烧过程，涉及到纤维素燃烧、纤维素废弃物的化学转化和木材残渣作为替代能源的利用等问题。在我们的实验室里，用各种分析方法研究了木材及其主要成分的热解反应。
When wood is heated at elevated temperatures, it will show a permanent loss of strength resulting from chemical changes in its components. The thermal decomposition can start at temperatures below 100°C if wood is heated for an extended period of time. Figure 1 shows that wood heated at 120° loses 10% of its strength in about one month, but i t takes only one week to obtain the same loss of strength if it is heated at 140° (1). Heating at higher temperatures gives volatile decomposition products and a charred residue. The pyrolytic reactions and products control the combustion process and relate to the problems of cellulosic fires, chemical conversion of cellulosic wastes and utilization of wood residues as an alternative energy source. In our laboratory, the pyrolytic reactions of wood and its major components have been investigated by a variety of analytical methods.Thermal analysis of cottonwood and its