Dry rooms are generally classified according to the following main characteristics.

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.

Furnace gas drying chamber is a general term for various drying chambers with furnace gas as the heat source. According to the different heating methods, it can be divided into three types: furnace gas drying room, furnace gas indirect heating drying room and hot air drying room.

Compared with the continuous type, the periodic type has great flexibility, wide adaptability, easy adjustment of temperature and moderate temperature, and can perform humidity control treatment, while the forced circulation is more uniform than the natural circulation, and the loading quantity is large, the drying time is short, and the drying efficiency is high. . Therefore, periodic circulation drying chambers are often used in production. There are many structural forms of this type of drying chamber, and their performance characteristics are not nearly the same. Periodic forced circulation drying is divided into four types according to the arrangement of fans in the drying room: indoor top fan type, indoor side fan type, indoor end fan type and jet type.

The working capacity of the heat pump dryer is related to the environment in which it is used. After one year of continuous use, the interior of the heat pump dryer unit may become dirty and the working capacity will decrease. Therefore, special equipment inspection and equipment maintenance must be carried out. For this kind of inspection and maintenance work, it is recommended that you contact the heat pump dryer manufacturer or its maintenance department. Users should pay attention when using and maintaining this unit: all safety protection devices in the unit are set before leaving the factory, and do not adjust it by yourself. .

1. Preheating treatment: First, the control system only opens the steam injection valve, and preheats by steam injection through the evaporation water tank in the kiln. The dry bulb temperature (Td) and the wet bulb temperature (Tw) in the kiln rise synchronously. The rapid 3-hour steam injection makes the drying medium in the kiln reach Td = Tw = 9 0 ℃ or more. Then, depending on the thickness of the dry sheet, keep it for different times to preheat the sheet.

Thermal modification of wood: heating the wood, resulting in a certain degree of degradation of the wood components, resulting in the desired improvement of the wood properties

Wood drying is the process with the largest energy consumption in the processing of wood products. In my country, wood drying accounts for 40%-70% of the total energy consumption. Therefore, the energy saving of the drying process becomes particularly important. The current drying methods (using moist air as the medium) include: atmospheric drying, conventional room drying, dehumidification drying, solar drying, vacuum drying, etc.

1. Drying stage of wood drying equipment: operate according to the process benchmark requirements, prevent temperature fluctuations in the heat preservation stage, and prevent the temperature from rising too fast when adjusting the benchmark stage;

Carbonized wood is a modified product of high temperature heat treatment of wood. Compared with ordinary wood, it has a series of characteristics: