How wood drying equipment works

The working principle of wood drying equipment is to increase the drying speed, save energy (explanation: substances that provide energy conversion to nature), and reduce drying costs on the premise of ensuring drying quality. Drying quality refers to: the moisture content and drying uniformity of the dried wood must meet the requirements of the processing technology; the integrity of the wood must also be maintained, no defects that are not allowed by the process specifications occur, and the wood and its products should not be weakened. some nature. Drying speed refers to the degree to which the moisture content of wood is reduced in unit time. The faster the drying speed (or the shorter the drying cycle), the less wood drying equipment and investment required, the higher the productivity and the less drying costs.
When selecting wood drying equipment in production, it is based on the species, specifications, quantity, use and actual conditions of the production unit of the wood to be dried. For the modern wood drying room, it is required to ensure that the temperature, humidity and air velocity of the drying medium and the external conditions of the stacked dried wood are basically the same in terms of technology, so as to achieve the purpose of uniform drying, and the operation must be safe, reliable and controlled. (control) flexible, the labor intensity of workers is small. The equipment investment is small, the land occupation is small, and the energy is saved. At the same time, the pollution to the surrounding environment should be reduced as much as possible.
The basic principle of wood drying equipment:
There are two main types of water in wood: free water and sorbed water. The water existing in the large capillary system composed of the cell cavity is called free water, and its increase or decrease only affects the weight of the wood, not the properties of the wood; the water existing in the microcapillary system composed of the cell wall is called sorbed water, which The change of the wood can not only shrink and expand the wood, but also affect other physical and mechanical properties of the wood.
Wood drying is to remove free water and absorbed water in the wood to suit different uses and quality requirements. Although there are many methods for drying wood, the basic principle is the same, that is to use the gradient of moisture content along the thickness of the wood and the difference in partial pressure of water vapor between the inside and outside formed after heating to promote the moisture to liquid and The two forms of vapor continuously move from the inside to the outside, and evaporate to the outside through the surface of the wood; the internal moisture movement intensity should be coordinated with the surface moisture evaporation intensity, so that the wood is balanced from the outside to the inside (Balance) dry.
The drying process of the traditional steam drying chamber is as follows: first, high temperature (below 100 ℃) and high temperature (saturated or near-saturated) humid air continuously passes through the pile of wood in a continuous flow to pre-condition the wood. hot. When the wood and its moisture are heated to a certain extent, the temperature and relative humidity of the medium are lowered according to the drying standards, forcing the moisture in the wood to evaporate from the surface, which is the beginning of drying. Then, according to the procedure specified by the drying benchmark, step by step, the temperature of the medium is increased and the relative humidity is decreased, so that the evaporation surface of the moisture in the wood gradually moves to the interior until the drying is over. During the drying process, the internal stress, cracking and deformation should be eliminated or reduced, and the physical and mechanical properties of the wood should not be reduced to ensure the drying quality.
Working principle of air energy heat pump wood drying equipment:
The air energy heat pump wood drying equipment uses clean power to drive the compressor (compressor) to absorb and transport the free heat in the air for heating, without manual operation and combustion to obtain heat; it is the energy-saving wood drying equipment on the market at present. After using 1KW electric energy to absorb and transport the heat energy in the air, it will generate more than 3KW of heating energy; it will be converted into a high temperature medium of 95-105 °C (a decisive substance), and transported to the condenser in the kiln using thermal insulation copper pipes to exchange heat and heat the kiln. The air is used to heat the wood, combined with the advantages of conventional and dehumidification drying, and the wood drying is carried out with the critical drying process.

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