[1]刘杰,张桂兰*,张振涛,等. 刺猬紫檀材热泵干燥特性及工艺研究[J].西北林学院学报,2018,33(3):245-248.[doi:10.3969/j.issn.1001-7461.2018.03.38]
 LIU Jie,ZHANG Gui-lan*,ZHANG Zhen-tao,et al. Drying Characteristics and Technology of Pterocarpus erinaceus Based on the Heat pump Drying Process[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2018,33(3):245-248.[doi:10.3969/j.issn.1001-7461.2018.03.38]
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 刺猬紫檀材热泵干燥特性及工艺研究()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第33卷
期数:
2018年第3期
页码:
245-248
栏目:
出版日期:
2018-05-31

文章信息/Info

Title:
 Drying Characteristics and Technology of Pterocarpus erinaceus Based on the Heat pump Drying Process
文章编号:
1001-7461(2018)03-0245-04
作者:
 刘杰1张桂兰1*张振涛1山其米克2
 (1.中国科学院 理化技术研究所,北京 100019; 2.新疆农业科学研究院 生物质能源所,新疆 乌鲁木齐 830091)
Author(s):
 LIU Jie1ZHANG Gui-lan1*ZHANG Zhen-tao1SHANQI Mike3
 (1.Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100019,China; 2.Institute of Biomass Energy,Xinjiang Institute of Agricultural Sciences,Urumqi,Xinjiang 830091,China)
关键词:
 刺猬紫檀材热泵干燥特性干燥工艺
Keywords:
 Pterocarpus erinaceus heat pump drying process drying technology
分类号:
S782.31
DOI:
10.3969/j.issn.1001-7461.2018.03.38
文献标志码:
A
摘要:
 为了提高名贵木材刺猬紫檀的材干燥质量,以刺猬紫檀锯材为对象,采用热泵系统对锯材进行除湿干燥同时对其干燥特性进行分析,从而进一步优化干燥工艺。研究中重点分析了干燥过程中的干燥曲线、含水率、含水率偏差、干燥应力、干缩率等影响干燥质量的因素,并借助CT无损扫描技术建立了锯材含水率与CT值的数学模型,利用模型直观表征锯材分层含水率对干燥质量的影响。在此基础上进行干燥等级评定,进而优化刺猬紫檀材的干燥工艺。结果表明,刺猬紫檀材基本密度为0.84 g·cm-3,弦向干缩系数为0.42%,径向干缩系数0.32%,体积干缩系数0.58%。刺猬紫檀干燥过程中锯材厚度上含水率偏差较大,应力梯度较大,采用较慢的干燥速率。通过建立CT值与分层含水率的线性回归方程y=0.149 8x+18.907 R2=0.990 3,实现木材干燥过程中应力的变化与干燥质量的可控性,获得优化的干燥工艺:20 mm厚、含水率42.2%的刺猬紫檀干燥528 h后,其含水率达到10.24%,而且干燥质量达到GB/T6491-2012《锯材干燥质量》规定的一级要求。热泵干燥可有效减小干燥过程中的厚度含水率梯度及干燥残余应力,减少木材干燥产生皱缩、变形、表裂等缺陷。
Abstract:
 In order to improve the drying quality of Pterocarpus erinaceus wood,the dehumidification drying and drying characteristics of the wood were analyzed with drying heat pump during the period of drying.Drying curve,moisture content and its deviation,drying stress and dying shrinkage rate were studied.Based on the CT scanning technology,the mathematical model between wood moisture content and CT value was established to study the influence of wood moisture content on drying quality.Based on drying stress,the drying grade was estimated.And drying process was optimized.The results showed that the basic density of the wood was 0.84 g·cm-3,the tangential coefficient of shrinkage was 0.42%,the radial coefficient of shrinkage was 0.32%,the volume coefficient of shrinkage was 0.58%.During the period of drying,the moisture content deviation of thickness was high and the stress gradient was large,indicating that we had to be reduced drying rate.From the linear regression equation of CT value and layer moisture content (y=0.149 8x+18.907 R2=0.990 3),controllability of stress change and drying quality could be realized during drying.When initial moisture content of the wood was 42.2%,the thickness was 22 mm,optimum drying time was 528 h,the moisture content of is the wood was 10.24% after drying,from which the drying quality met the requirements of the first grade lumber of Chinese national standard (GB/T6491-1999 sawn timber drying quality regulation level requirements).Technology of drying heat pump could decrease moisture gradient of thickness and drying residual stress effectively during drying.At the same time,technology of drying heat pump could reduce the wood drying shrinkage,deformation,crack defects.

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备注/Memo

备注/Memo:
 收稿日期:2017-03-30修回日期:2017-10-12
基金项目:国家科技部“十二五”科技支撑项目(2015BAD14B04;科技援疆项目(201591116)。
作者简介:刘杰,女,硕士,研究方向:材料传热传质。E-mail:1285444893@qq.com
*通信作者:张桂兰,女,教授,博士,研究方向:材料传热传质。E-mail:zhangguilan2003@mail.ipc.ac.cn
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