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A method of drying wood

A drying method and technology for wood, which are applied in wood drying, dryers for stationary materials, drying of solid materials, etc., can solve the problems of increasing the relative humidity of the drying environment and reducing the gradient of moisture content in the drying process of fast-growing wood.

Active Publication Date: 2020-12-04
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the technical problem that the existing fast-growing wood drying process is prone to drying defects, and to provide a fast-growing wood drying treatment equipment and drying treatment method. The relative humidity reduces the temperature difference inside the wood and increases the relative humidity of the drying environment, which essentially reduces the moisture content gradient during the drying process of the fast-growing wood, thereby ensuring the quality of the wood during the pretreatment process, and then adopts conventional drying. Compared with directly adopting conventional drying, the present invention greatly improves the drying efficiency of wood

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] 1. Determination of the initial moisture content of the wood to be dried (M 0 )

[0095] According to the sampling inspection standard, randomly select a representative wood from the fast-growing eucalyptus wood to be dried, and first weigh its wet weight (G 湿 ), then place the weighed fast-growing wood in an oven with a temperature of (103±2)°C, dry it, and weigh it every 6 hours. When the weight difference between two consecutive weighings is less than 0.02g, it is considered as Dried to a dry state, the weight of the fast-growing wood at this time is the dry weight of the fast-growing wood (G 干 );

[0096] According to the wood moisture content formula (1), calculate the initial moisture content of the wood to be dried (M 0 ):

[0097]

[0098] The initial moisture content M of fast-growing timber eucalyptus wood in the embodiment of the present invention 0 It is 95% (60-200% of the initial moisture content of the wood to be dried is applicable to the present...

Embodiment 2

[0145] 1. Determination of the initial moisture content of the wood to be dried (M 0 )

[0146] Same as embodiment 1;

[0147] 2. Palletizing

[0148] Except that 5 temperature sensor groups are arranged at the drying medium inflow end and the outflow end of the material pile, all the other are the same as embodiment 1;

[0149] 3. Wood pretreatment

[0150] Except step A) in the pretreatment process: during the pretreatment process, measure the dry and wet bulb temperature T of the drying medium in the drying chamber every 2min (usually 1-3min) 干 and T 湿 ; Then when calculating the relative humidity (Φ) in the drying chamber according to the formula (3):

[0151] (A1) When Φ≤80%, open the steam generator in the drying chamber, spray steam into the drying kiln, and increase the relative humidity in the drying kiln;

[0152] (A2) When Φ≥90%, turn off the steam generator, stop spraying steam, and keep the relative humidity in the drying kiln higher than 80%, otherwise;

...

Embodiment 3

[0165] 1. Determination of the initial moisture content of the wood to be dried (M 0 )

[0166] Same as embodiment 1;

[0167] 2. Palletizing

[0168] Except that 5 temperature sensor groups are arranged at the drying medium inflow end and the outflow end of the material pile, all the other are the same as embodiment 1;

[0169] 3. Wood pretreatment

[0170] In addition to the heating stage of pretreatment except step B1) in the pretreatment process, that is, when the medium temperature is lower than 90°C (usually 70-90°C):

[0171] B1-1) When T 表 –T 中 When >5°C (usually 5-8°C), the heater is turned off, waiting for the temperature of the wood core to continue to rise;

[0172] B1-2) When T 表 –T 中 When ≤2°C (usually 2-4°C), turn on the heater and heat up at a heating rate of 10°C / h (usually 5-10°C / h);

[0173] Wherein, in the heating stage, steps B1-1) and B1-2) are carried out alternately until the temperature of the drying medium in the drying chamber reaches and re...

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Abstract

The invention discloses a fast-growing wood drying method. The method comprises the steps that after to-be-dried wood is pretreated to obtain pretreated wood, the pretreated wood is dried according toordinary benchmark programs for wood drying, wherein the water content of the pretreated wood is 30-90%. The central temperature and surface temperature difference of wood in a wood stack is precisely controlled, the wet bulb depression in a drying room is adjusted, and the wood is dried according to the ordinary benchmark programs for wood drying after the wood is pretreated, so that high-quality dried wood is obtained. By means of the method, the water content gradient in the fast-growing wood drying process is reduced, and thus the treatment quality of the wood in the pretreatment processis guaranteed; then conventional drying is adopted, and compared with direct adoption of conventional drying, the wood drying method greatly improves wood drying efficiency, reduces drying stress, reduces drying defects and improves drying efficiency.

Description

technical field [0001] The invention relates to a method for drying fast-growing wood, in particular to a method for drying fast-growing wood by 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. Because wood has the characteristics of shrinkage, swelling and anisotropy, if the drying standard is not accurately controlled during the drying process of wood, drying defects such as cracking and shrinkage will occur, making The wood is heavily degraded. However, fast-growing wood has the characteristics of high growth stress, uneven moisture content, and easy to appear defects, which makes its drying process a major problem at present. In order to solve the drying problem of fast-growing wood. Resear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B9/06F26B21/02F26B21/08F26B25/22
CPCF26B9/06F26B21/02F26B21/08F26B25/225F26B2210/16
Inventor 何正斌伊松林王振宇钱京曲丽洁
Owner BEIJING FORESTRY UNIVERSITY
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