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The Research on Flow Control Technology of Wind Circulation in the Wood Drying Kiln

Author: ChangLiang
Tutor: LiuYaQiu
School: Northeast Forestry University
Course: Applied Computer Technology
Keywords: Wood drying Air circulation Model Flow control technology Wood pile
CLC: TS652
Type: Master's thesis
Year: 2010
Downloads: 78
Quote: 0
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Abstract


Wood drying is to improve the physical and mechanical properties of wood, reduce wood downgraded loss, improve timber utilization, protection of an important part of the quality of the wood products. Our country is a national shortage of forest resources, efficient use of timber resources, can effectively protect forest resources. Wood processing, wood drying is an indispensable step, but also directly affects the quality and utilization of wood processing, therefore, to study the energy efficient wood drying kiln air circulation system is to improve the drying quality important timber resource savings measures, great significance to the protection of forests and energy conservation. The most important way to improve timber utilization is to improve the efficiency of wood drying, improved wood drying methods and techniques, and the wood drying kiln stroke circulatory system is an important part of the wood drying, and how to improve the air circulation the CNC systems become important factors in wood drying quality. This study (1) the basic principles of wood drying, the drying process, and modeling methods. Changes of moisture in the the study wood drying process, to optimize the drying process, the establishment of mathematical models and methods of energy conservation. (2) timber drying kiln air circulation system fan organizational structure and numerical control system, combined with the theory of aerodynamics modeling air circulation system. (3) wood pile of timber drying kiln air circulation system control of the various parameters change during the drying process and its coupling relationship with each other, the air flow velocity, temperature, pressure, humidity, and other series of the parameters affect the wood drying quantizing obtained by experiment The best combination of values, to avoid the negative coupling of many confounding factors, in order to better control the wood drying process. The results of this study are (1) to study the adverse impact of the existing wood drying kiln air circulation numerical control system on the quality of the wood drying, analysis of the reasons for the formation of several new types of wind circulation CNC system combined with computer technology and automatic control theory and a simulation experiment. (2) analysis of the impact of timber drying effect by simulating industrial drying kiln air circulation system environment, and propose a solution, provide a theoretical basis for the improvement of timber utilization. (3) study of single and multiple material heap gap caused by airflow expansion impact on the quality of the wood drying, and how to avoid or eliminate these negative factors, and to find a comprehensive and effective measures and theoretical basis. In this paper, for the establishment of a new wood drying saves energy system, improve timber utilization, reduce wood cracks, warpage and shrinkage defects, shorten the drying time is significantly improved, as soon as practicable in actual industrial production.

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CLC: > Industrial Technology > Light industry,handicrafts > Wood processing industry,furniture manufacturing industry > Processing > Lumber processing
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