When selecting the type of drying chamber, technical selectivity, process reliability, economic rationality, and the requirements for dry quality and production of wood depending on the species, size and quantity of the wood to be dried, and the production should be considered. The specific circumstances of the unit, etc.
Steam heating wood drying method is the most traditional widely used at home and abroad. Its main advantages are stable technical performance, mature technology, easy adjustment and control of temperature and humidity. It can be used for central heating and can be used to dry a variety of materials. If the drying process is reasonable, the operation is correct, the drying quality is guaranteed, and the capacity of the drying chamber is large. The disadvantage is that steam boilers are needed, equipment investment is high, and drying costs are moderate or high.
The wood drying method of hot water heating has some advantages of steam drying. The wood processing residue can be used as fuel, and the drying cost is greatly reduced. Due to the large hot water capacity, the dry indoor air condition is relatively stable and easy to control. The main disadvantage is that due to the low temperature of the normal pressure hot water (about 95 degrees), the drying cycle is slightly longer, especially when drying the conifer tree sheet, the drying speed is not as fast as steam drying. However, it is very suitable for small companies to dry hard and hardwood trees.
The wood drying method of indirect heating of furnace gas mainly has the advantage that the boiler is not used, and the processing residue of the factory is used as energy, and the drying cost is low. The disadvantage is that the temperature state of the drying medium is not easy to adjust and control. High requirements for operational technology and responsibility, and relatively high labor intensity. The reliability of this type of social security is very relevant to the design. There is no stronger than reasonable design and reasonable construction of the "earth kiln", not only dry uneven, long drying time, dry quality is not guaranteed, but also prone to fire.
The advantage of the dehumidification drying method is that the latent heat of vaporization released by the condensation of the humid air can be recovered, and there is almost no or only a small amount of exhaust heat loss. And the process is simple and easy to operate. Dry and safe, will not cause wood damage. The disadvantages are low drying temperature and long drying period. For thick plates or difficult materials, it is not easy to dry out, and the drying cost is high. Applicable to areas with abundant power resources, low electricity costs, and strict restrictions on environmental pollution. At present, due to the appearance of high-temperature working fluid, the heating temperature can reach 90 degrees close to the conventional drying, and the drying method is expected to be vigorously developed, especially the combined drying of dehumidification and conventional drying.
Steam heating wood drying method is the most traditional widely used at home and abroad. Its main advantages are stable technical performance, mature technology, easy adjustment and control of temperature and humidity. It can be used for central heating and can be used to dry a variety of materials. If the drying process is reasonable, the operation is correct, the drying quality is guaranteed, and the capacity of the drying chamber is large. The disadvantage is that steam boilers are needed, equipment investment is high, and drying costs are moderate or high.
The wood drying method of hot water heating has some advantages of steam drying. The wood processing residue can be used as fuel, and the drying cost is greatly reduced. Due to the large hot water capacity, the dry indoor air condition is relatively stable and easy to control. The main disadvantage is that due to the low temperature of the normal pressure hot water (about 95 degrees), the drying cycle is slightly longer, especially when drying the conifer tree sheet, the drying speed is not as fast as steam drying. However, it is very suitable for small companies to dry hard and hardwood trees.
The wood drying method of indirect heating of furnace gas mainly has the advantage that the boiler is not used, and the processing residue of the factory is used as energy, and the drying cost is low. The disadvantage is that the temperature state of the drying medium is not easy to adjust and control. High requirements for operational technology and responsibility, and relatively high labor intensity. The reliability of this type of social security is very relevant to the design. There is no stronger than reasonable design and reasonable construction of the "earth kiln", not only dry uneven, long drying time, dry quality is not guaranteed, but also prone to fire.
The advantage of the dehumidification drying method is that the latent heat of vaporization released by the condensation of the humid air can be recovered, and there is almost no or only a small amount of exhaust heat loss. And the process is simple and easy to operate. Dry and safe, will not cause wood damage. The disadvantages are low drying temperature and long drying period. For thick plates or difficult materials, it is not easy to dry out, and the drying cost is high. Applicable to areas with abundant power resources, low electricity costs, and strict restrictions on environmental pollution. At present, due to the appearance of high-temperature working fluid, the heating temperature can reach 90 degrees close to the conventional drying, and the drying method is expected to be vigorously developed, especially the combined drying of dehumidification and conventional drying.
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