Wood dryers are specially designed and manufactured for drying sawdust, small pieces of wood, and veneer. It has the characteristics of high drying yield, significant energy-saving effect, and low maintenance cost. The main working principle is that wood chips enter the wood chip dryer through a blowing tube and a rotating cylinder, and the material boils and fluidizes in the cylinder. Hot air fully contacts the material to complete drying. It is mainly composed of air heater, feeder, air Drying tube, cyclone separator, fan, etc. So what are the steps of the wood drying process?

A dedicated hot air (steam) drying equipment for wood, which can dry various tree species, specifications, and uses of wood. It has the advantages of high efficiency, energy conservation, safety and reliability, short drying cycle, good drying quality, and low drying cost. Widely applicable to large, medium, and small wood processing enterprises, especially production enterprises engaged in the export of wood products.

During normal operation of a wood dryer, the fuel is fully burned in the combustion chamber to generate heat energy, which is fully absorbed by the drying medium in the thermal drying system, resulting in a temperature of approximately 180 degrees Celsius. Under the action of a circulating fan, the high-temperature airflow is transmitted to the drying chamber through the control system and conveying system to dry the wood. At the same time, the steam generation device on the equipment can generate a large amount of atmospheric steam. According to the requirements of the drying process, steam can be sent into the drying chamber at appropriate times to spray wood and adjust humidity. The humidity control system is an independent steam system. Equipped with safety devices.

The saturated wet steam of a wood dryer can cause the surface temperature and internal humidity of the wood to converge in a short period of time, thereby achieving the goal of drying both the interior and exterior of the wood simultaneously. For solid, heavy, hard, and thick wood, intermittent heating and drying processes can be used. Solved internal cracks, end cracks, deformation and other defects of wood during the drying process, greatly improving the yield of high-quality wood.

1. Preheating treatment stage of wood dryer

The purpose is to preheat the wood before drying, without setting the speed. Start the heat pump dryer to provide heat to the drying room, turn on the electrical auxiliary system, and set the temperature between 20 ° C and 45 ° C. The temperature should not rise too quickly and all dehumidification equipment should be turned off.

2. Dehumidification treatment stage

Intermediate treatment is a humidifying treatment carried out during the kiln drying process. The purpose is to eliminate the surface expansion stress generated in the early stage to prevent surface cracking, or to eliminate the Case-hardening caused by drying in the middle and later stages to prevent internal cracking in the later stage.

Dehumidification is carried out based on the air humidity inside the drying room. After preheating, when the temperature is above 55 degrees, the humidity can be dehumidified for 20 to 30 minutes each time. After dehumidification, the temperature will slightly decrease and then gradually increase, but not exceed 70 degrees. The temperature rise can be set according to different types of wood. Different types and thicknesses of wood. This operation takes approximately 3-7 days.

3. Drying stage

When the temperature rises to 60 ℃ -75 ℃, the wood has basically dried. After cooking for 4-8 hours, take a sample for inspection. If the qualified standard is met, please slowly lower the temperature of the drying room until the wood temperature drops to the ambient temperature. Room.