The use of solar energy for drying of articles is one of the ways of solar thermal utilization. Compared with people's conventional open-air natural drying, there are many advantages: solar dryers can fully utilize solar energy, save conventional energy, effectively increase drying temperature and shorten During the drying time, the dry matter can avoid the pollution of sediment and dust, and will not deteriorate due to weather changes, thereby obtaining high-quality products and contributing to environmental protection. There are several reasons why wood can be used after it has been dried:
1. Prevent cracking and deformation of wood. When the moisture in the wood evaporates into the air, especially when the moisture content of the wood is below the fiber saturation point of the wood, it causes a shrinkage of the volume of the wood. If the shrinkage is uneven, the wood will crack or deform. If the wood is dried to the extent appropriate for the environment of use or the state required for use, the volumetric size of the wood can be kept relatively stable and durable.
2. Improve the strength of wood, improve the physical properties of wood and processing conditions. When the moisture content in the wood is below the fiber saturation point, the strength of the wood increases as it decreases; at the same time, the wood is also easy to saw and plan to reduce the loss to the woodworking machinery.
3. Prevent mildew, decay and insects in the wood. When the moisture content in the wood is in the range of 20% to 150%, mold is easily generated, causing mildew, decay and insects in the wood. If the moisture content of the wood is dried below 20%, the conditions for mold production in the wood are destroyed, which enhances the wood's ability to resist mildew, decay and insects, and maintains the original characteristics of the wood.
4. Reduce the quality of wood and improve transportation capacity. The quality of the dried wood can be reduced by 30% to 40%. If the wood is concentrated in the supply area of ​​the wood and the concentrated dry wood, the transportation capacity of the wood can be greatly improved; at the same time, the mildew and decay of the wood during transportation can be prevented, and the quality of the wood can be ensured.
In short, wood drying is an important technical measure for rational use and saving of wood, and is an indispensable important process in wood processing and production. As a raw material, there are many fields of wood application, and most of them need to be dried. Therefore, wood drying has important practical significance for national economic construction.
1 Solar drying system design
System overview: It is planned to build a 100m2 wood drying room with 2m2 of wood per box, a drying temperature of 60°C, a greenhouse of 100m2, a drying blower, and a preheating of the air into the drying room using a flat solar collector. Dry.
Auxiliary heat source: Auxiliary heating using an air source heat pump.
Air supply mode: use forced ventilation, and configure one blower to speed up the drying.
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