Wood contains a lot of organic matter and nutritious inorganic matter, which is especially suitable for the growth and reproduction of wood-rot fungi, discoloration fungi, and insects. Three conditions for the parasitism of wood-rot fungi and color-changing fungi: ① Suitable temperature. The optimum growth temperature for fungi is 24.4-30°C. ②Oxygen supply. Sufficient supply of oxygen is also one of the conditions for fungal growth. ③Appropriate wood moisture content. Generally speaking, the moisture content of 30-40% is the most suitable for the growth of wood rot fungi. If one of the above three conditions is not met, the fungus cannot survive. The method we adopt is to degrease and dry the wood at high temperature.

Wood is a natural material. Compared with other materials, it can absorb ultraviolet rays and has a small reflection coefficient, which can effectively control the temperature and humidity of the indoor environment. The structure, texture, pattern, color and luster of wood give people a good visual impression. The space with wood will make people feel comfortable in work, study and life, thereby improving people's work efficiency and learning interest, and improving the quality of human life. However, wood also has many disadvantages. For example, when wood is used, it will exchange moisture with the surrounding environment, resulting in shrinkage and swelling, which will cause deformation and cracking of wood products. Wood is the food of many fungi and insects, so wood products are prone to mold and insects.

The quality of the drying room can be measured by technical and economic performance. But technical and economic performance is not the only basis for choosing a drying room. Different types of drying rooms have different applicability, which must be determined according to the scale of the enterprise, energy conditions, characteristics and quality of the wood to be dried.

The temperature and humidity of the gas medium in the wood drying chamber vary widely, the general working temperature is -30-100°C, the high temperature drying and superheated steam drying can be as high as 120°C, and the relative humidity is up to 100%. In addition, the drying medium also contains acidic substances such as formic acid, acetic acid, and tannin evaporated from the wood, and is continuously circulated indoors at a certain airflow speed. Therefore, the object of the drying room should have good heat preservation, sealing, and corrosion resistance. and anti-aging properties.

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The requirement of the wood drying control system is to meet the control purpose to the greatest extent, and it should have the following characteristics:

In the pile, two adjacent layers of wood should be evenly separated by spacers, forming a horizontal airflow channel at the height of the pile. In the middle of these passages, the drying medium and the surface of the wood carry out heat and moisture exchange that is conducive to the gradual drying of the wood.

(1) The start of the drying room. Close the inlet and exhaust ducts; start the fans. For a reversible circulation drying room with multiple fans, start the fans one by one. Do not start several fans at the same time to avoid overloading the circuit; open the valve of the bypass pipe of the steam trap and open it slowly. Heater, to make the heating system heat up slowly and discharge the air, water and rust in the piping system at the same time, when a large amount of steam is ejected from the bypass pipe, then close the valve of the bypass pipe and open the steam trap valve to make the steam trap work normally .

In October and November of this year, the company updated some certificates

Convective drying of wood in gaseous medium.There are two cases: 1. When the moisture content is lower than the fiber saturation point. 2. When the moisture content is higher than the fiber saturation point.