水热预处理对枫香木材干燥性能影响的研究
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摘要
为探索水热预处理对枫香木材干燥性能影响规律,枫香木材先通过水热处理,再利用常规与降温干燥方法对其进行干燥,通过扫描电子显微镜对比分析预处理材与未处理材的微观组织结构变化,评价不同干燥方法的干燥速度与干燥质量。研究结果表明:干燥初期,预处理后枫香木材的常规干燥速度与降温干燥速度较未处理木材的干燥速度分别提高9.2%和12.8%。干燥中后期,常规干燥速度与降温干燥速度分别提高28.7%和15.5%。同时,预处理枫香木材厚度方向含水率偏差及残余应力指标均低于未处理木材。
In order to reveal the effect of hydrothermal pretreatment on drying performance of Chinese sweetgum wood, the wood was pretreated and dried by different drying methods.The micro-structure was scanned by scanning electron microscope(SEM).The drying speed and drying quality were evaluated.Results were shown as follows: In beginning of the dry, the drying speed of conventional drying and lowering temperature drying for pretreated samples improved 9.2% and 12.8%, respectively.In middle and late drying period, they improved 28.7% and 15.5%, respectively.Water content deviation in thickness direction and residual stress of pretreated samples were decreased after pretreated.
In order to reveal the effect of hydrothermal pretreatment on drying performance of Chinese sweetgum wood, the wood was pretreated and dried by different drying methods.The micro-structure was scanned by scanning electron microscope(SEM).The drying speed and drying quality were evaluated.Results were shown as follows: In beginning of the dry, the drying speed of conventional drying and lowering temperature drying for pretreated samples improved 9.2% and 12.8%, respectively.In middle and late drying period, they improved 28.7% and 15.5%, respectively.Water content deviation in thickness direction and residual stress of pretreated samples were decreased after pretreated.
引文
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[15]Rovshandeh M J, Mohebby B, Ramezani O, et al. Influence of Hydrothermal Treatment on the Dimensional Stability of Beech Wood[J].Research, 2007,(2):125-131.
[2]李重根,李汇林.枫香木材干燥基准的测定与研究[J].江西农业大学学报, 1992(2):171-178.
[3]徐开蒙,彭鹏祥,涂登云,等.枫香地板坯料的干燥工艺[J].林产工业, 2011, 38(5):10-12.
[4]徐开蒙,彭鹏祥,涂登云,等. 60 mm厚枫香木材快速干燥工艺[J].木材工业, 2011, 25(6):38-40.
[5]王婧.微波预处理对尾叶桉人工林木材干燥特性的影响[D].北京:中国林业科学研究院, 2010.
[6]杨亮庆.枫桦圆盘预处理及干燥特性研究[D].哈尔滨:东北林业大学, 2011.
[7]董晓璐,孙耀星,杜洪双,等.辊压预处理条件对蒙古栎干燥速率及纹孔结构的影响[J].林业科学, 2015, 51(1):103-111.
[8]杨胜丽,温明宇,杨庚,等.辊压预处理对木材干燥速率和材性的影响[J].东北林业大学学报, 2015(12):69-73.
[9]张耀丽,苗平,庄寿增,等.微波、冷冻预处理对改善尾巨桉木材干燥性能的影响[J].南京林业大学学报(自然科学版), 2011, 35(2):61-64.
[10]余梦洁.微爆破预处理对落叶松木材干燥及脱脂效果的影响[D].北京:北京林业大学, 2012.
[11]于建芳,王喜明.预处理人工林桉树木材干燥特性的比较研究[J].中国科技论文在线, 2012:1-8.
[12]杨松,李达,魏立婷,等.预处理对冀北黑桦木材干燥特性影响[J].河北省科学院学报, 2017(4):70-76.
[13]Zhurinsh A, Dobele G, Jurkjane V, et al. Impact of hot water pretreatment temperature on the pyrolysis of birch wood[J]. Journal of Analytical and Applied Pyrolysis, 2017, 124:515-522.
[14]赵东洋.预处理对榆木锯材干燥性能和质量影响研究[D].哈尔滨:东北林业大学, 2016.
[15]Rovshandeh M J, Mohebby B, Ramezani O, et al. Influence of Hydrothermal Treatment on the Dimensional Stability of Beech Wood[J].Research, 2007,(2):125-131.