木材微波预处理圆柱形谐振腔理论模拟与设计

doi:10.11707/j.1001-7488.20140316

Abstract

Abstract:

Based on the Maxwell electromagnetic field equations and the heat and mass transfer mechanism of wood, a heat and mass transport and a electromagnetic field distribution model for wood microwave pretreatment were developed to simulate the effect of the microwave feeding mode and cylindrical resonant cavity radius on the temperature uniformity and microwave energy utilization efficiency using finite element analysis software (Comsol Multiphysics), and the optimizational parameters for the cylindrical resonant cavity was achieved. The results showed that: 1) the effect of microwave feeding mode and the radius of the cylindrical resonant cavity on the temperature uniformity within wood and microwave energy utilization efficiency was significant. 2) Compared with the other microwave feeding mode, the temperature distribution uniformity within wood and microwave energy utilization efficiency was the highest(up to 87.48%)when the microwave radiation with 3 waveguides feeding is used to heat wood. 3) The temperature coefficient variation and microwave energy utilization efficiency basically decreased and then increased with the increasing the radius of the cylindrical resonant cavity, and the optimizational radius for the cylindrical resonant cavity was in the range from 0.186 m to 0.211 m.

Key words: wood microwave pretreatment, resonant cavity radius, temperature distribution, energy utilization efficiency

CLC Number:

S781.71

Luo Yongfeng, Li Xi, Li Xianjun, Chen Hongbin, Chai Yuan. Mathematical Simulation and Design of Cylindrical Cavity of Microwave Pretreatment Equipment Used for Wood Modification[J]. Scientia Silvae Sinicae, 2014, 50(3): 117-122.

References

江涛, 周志芳, 王清文. 2006. 高强度微波辐射对落叶松木材渗透性的影响. 林业科学, 42(11): 87-92.
(Jiang R, Zhou Z F, Wang Q W. 2006. Effects of intensive microwave irradiation on the permeability of larch wood. Scientia Silvae Sinicae, 42(11): 87-92. [in Chinese] )
李贤军, 孙伟圣, 周涛,等. 2012. 微波处理中木材内温度分布的数学模拟. 林业科学, 48(3): 117-121.
(Li X J, Sun W S, Zhou T, et al. 2012. Mathematical modeling of temperature profiles in wood during microwave heating. Scientia Silvae Sinicae, 48(3): 117-121. [in Chinese] )
吕悦孝, 薛振华, 薛利忠. 2001. 微波改性木材的超微观察.内蒙古林业科技, (4): 31-33.
(Lv Y X, Xue Z H, Xue L Z. 2001. Observing ex-microcos mic structure of microwave modified wood. Inner Mongolia Forestry Science and Technology, (4): 31-33. [in Chinese] )
王喜明, 薛振华, 石丽慧,等. 2002. 微波改性木材的初步研究.木材工业, 16(6): 16-19.
(Wang X M, Xue Z H, Shi L H, et al. 2002. Preliminary study on microwave modified wood. China Wood Industry, 16(6): 16-19. [in Chinese] )
王婧. 2010. 微波预处理对尾叶桉人工林木材干燥特性的影响. 北京: 中国林业科学研究院硕士学位论文.
(Wang J. 2010. The influence of microwave pretreatment on drying characteristics of Eucalyptus urophylla. Beijing: PhD thesis of Chinese Academy of Forestry. [in Chinese] )
赵荣军, 王喜明, 江泽慧, 等. 2003. 桉树人工林微波处理材干燥特性和干燥基准. 哈尔滨:第九次全国木材干燥学术讨论会论文集, 62-69.
(Zhao R J, Wang X M, Jiang Z H, et al. 2003. Study on drying and collapse properties and schedule of Eucalypts treated by MW. Haerbin: Assembly documents of the 9th national wood drying symposium, 62-69. [in Chinese] )
周志芳, 江涛, 王清文. 2007. 高强度微波处理对落叶松木材力学性质的影响.东北林业大学学报, 35(2): 7-8.
(Zhou Z F, Jiang T, Wang Q W. 2007. Influence of intensive microwave treatment on mechanical properties of larch wood. Journal of Northeast Forestry University, 35(2): 7-8. [in Chinese] )
周永东, 傅峰, 李贤军, 等. 2009. 微波处理对桉木应力及微观构造的影响.北京林业大学学报, 31(2): 146-150.
(Zhou Y D, Fu F, Li X J, et al. 2009. Effects of microwave treatment on residue growth stress and microstructure of Eucalyptus urophylla. Journal of Beijing Forestry University, 31(2): 146-150. [in Chinese] )
周永东, Torgovinkov G, Vinden P, 等. 2011. 微波预处理加速阔叶树材干燥的技术分析. 木材工业, 25(1): 23-25.
(Zhou Y D, Torgovinkov G, Vinden P， et al. 2011. Technological analysis of microwave pretreatment for fast drying of hardwood. China Wood Industry, 25(1): 23-25. [in Chinese] )
Ayappa K G. 1997. Modelling transport processes during microwave heating: a review. Reviews in Chemical Engineering, 13(2): 1-69.
Hansson L, Antti L. 2008. Modeling microwave heating and moisture redistribution in wood. Drying Technology, 26(5): 552-559.
Harris G A, Torgovnikov G, Vinden P, et al. 2008. Microwave pretreatment of backsawn messmate boards to improve drying quality: Part 1. Drying Technol, 26(5): 579-584.
Krisdianto S, Vinden P, Torgovnikov G. 2010. Microwave surface modification of Pinus radiata peeler cores: technical and cost analyses. For Prod J, 60(4): 346-352.
Li X J, Zhang B G, Li W J, et al. 2005. Research on the effect of microwave pretreatment on moisture diffusion coefficient in wood. Wood Science and Technology, 39(7): 521-528.
Li X J, Zhou Y D, Yan Y L, et al. 2010.A single cell model for pretreatment of wood by microwave explosion. Holzforschung, 64(5): 633-637.
Marra F, De Boins M V, Ruocco G. 2010. Combined microwaves and convection heating: a conjugata approach. Journal of Food Engineering, 97(1): 31-39.
Mekhtiev M A, Torgovnikov G I. 2004. Method of check analysis of microwave-modified wood. Wood science and Technology, 38(7): 507-519.
Przewloka S R, Hann J A, Vinden P. 2007. Assessment of commercial viscosity resins as binders in the wood composite material Vintorg. Holzals Roh-und Werkst stoff, 65(3): 209-214.
Torgovnikov G, Vinden P. 2000. New wood based materials TORGVIN and VINTORG. 5^th Pacific Rim Bio-Based Composite Symposium, Canberra Australia: December 2000, 756-757.
Torgovnikov G, Vinden P. 2006. New 300 kW plant for microwave wood modification. International Microwave Power Institute's 40^th Annual Symposium, Boston, Massachusetts, USA, 260-263.
Torgovnikov G, Vinden P. 2009. High intensity microwave wood modification for increasing permeability. For Prod J, 59(4): 84-92.
Torgovnikov G, Vinden P. 2010. Microwave wood modification technology and its application. For Prod J, 60(2): 173-182.
Vinden P, Torgovnikov G, Hann J. 2011. Microwave modification of radiata pine railway sleepers for preservative treatment. Eur J Wood Prod, 69(2): 271-279.

[1]	Liu Cungen, Zhou Shiyu, Ge Zhedong, Du Guangyue, Zhou Yucheng. The Construction and Verification of Heat Storage Performance Testing Model of Wood Materials Used for Floor Heating [J]. Scientia Silvae Sinicae, 2018, 54(10): 125-131.
[2]	Li Xianjun;Sun Weisheng;Zhou Tao. Mathematical Modeling of Temperature Profiles in Wood During Microwave Heating [J]. Scientia Silvae Sinicae, 2012, 48(3): 117-121.
[3]	Zhang Jiawei;Li Mingbao. Finite Element Numerical Simulation and Validation on Transient Temperature Distribution of Soft wood [J]. Scientia Silvae Sinicae, 2008, 44(1): 117-123.
[4]	Yin Lifeng;Li Shuhua. Temperature Character of Roof Greening on Low Energy Demo Building of Tsinghua University [J]. Scientia Silvae Sinicae, 2007, 43(08): 143-147.
[5]	Meng Ping;Song Zhaomin;Zhang Jinsong;Chen Jianye. A STUDY ON SOLAR ENERGY UTILIZATION EFFICIENCY OF AGROFORESTRY SYSTEM [J]. , 1997, 33(zk1): 14-19.
[6]	Hua Yukun;Fu Feng. STUDIES ON ELECTRICALLY CONDUCTIVE PLYWOOD [J]. , 1995, 31(3): 254-259.

Mathematical Simulation and Design of Cylindrical Cavity of Microwave Pretreatment Equipment Used for Wood Modification

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 6

Recommended Articles

Metrics

Comments