Wood drying method

Abstract

The invention discloses a novel wood drying method. The wood drying method comprises the following steps in sequence: sawing wood to be dried into wood sections with required lengths and measuring the initial water content and the oven-dry density of the wood; stacking the wood in a drying room; measuring the temperature of a feeding end and a discharging end of a wood stack along the drying medium flowing direction; according to the relationship equation of the temperature of the wood stack, steam partial pressure in the drying medium and the water content of the wood, calculating the accurate water content of the wood; and drying the wood according to the water content of the wood and the common wood drying benchmark program so as to obtain the high-quality dry wood. According the method, the measured water content of the wood is accurate, and the defect of large error of the water content measured by an electrical measuring method in prior arts can be overcome. The method is suitable for drying wood with any water content, the factor to be controlled in the drying process is single, the system is stable, and the wood drying quality and the wood drying efficiency are improved.

Description

technical field [0001] The invention relates to a wood drying method, in particular to a wood drying method using a wood drying standard, and belongs to the field of wood drying. Background technique [0002] Wood drying is a very important process in the wood processing process, and it is also an important way to improve wood utilization and save forest resources. The drying process of wood is the process of water evaporation in wood. Due to the different relationship between various water in wood and the structure of wood, the properties of water in wood at each stage are different, and the properties of wood corresponding to this are different. Therefore, in the drying process of wood, it is necessary to reasonably control the evaporation process of water in the wood, and to increase the drying speed as much as possible on the premise of ensuring the drying quality. [0003] In the wood drying process, the moisture content of wood is an important parameter to establish d...

AI Technical Summary

Problems solved by technology

[0005] However, in the existing wood drying control research, the accuracy of the moisture content measured by the electrical measurement method is poor, and the error is relatively large, just because for different woods, the electrical resistance not only changes with the moisture content, but also varies with the moisture content. Temperature, tree species, wood density and grain direction are related, so there are many correction coefficients in the measurement process, and the accuracy is not high, especially for those wood whose properties are not well understood, it is more difficult to measure, and when the moisture content of wood is higher than fiber saturation When the temperature is 30%, there is free water inside the wood, and its electrical properties are equivalent to those of water, so the relationship between resistance and moisture content is not great, so the measured moisture content is inaccurate, and when the moisture content of wood is lower than At 5%, due to the large resistance value of the wood at this moment, it can reach 25 gigaohms, which makes the result of the electrical measurement method inaccurate, and the moisture content of the wood measured by the electrical measurement method is not accurate, resulting in Deviations from the wood drying program determined by the method will eventually lead to a decline in the quality of the dried wood

Images