Drying process of wood heat pump dryer: 1. Install the wood according to the decoration standards, close the drying room, and turn on the control system. 2. Preheating: Turn on the heat pump and fan, set the upper temperature limit to 45 ℃. In order to save preheating and heating time, turn on the electric auxiliary system, and control the ambient temperature from 20 ℃ to 45 ℃ for heating and insulation time within 14 hours; At this stage, the energy efficiency ratio of the heat pump is around 3.5, operating at full load and the fan at full load.

Wood in certain circumstances, after a long enough time, its moisture content will tend to be a balance value, in order to ensure that the equilibrium moisture content of the environment, so the use of wood drying equipment, is indispensable. Once the lumber moisture content is higher than the environment balance moisture content, the wood will appear the platoon is wet contraction, on the other hand, hygroscopic and expansion of will. So, wood drying, not as dry as possible.

Below for everyone to introduce wood drying equipment of energy conservation and consumption reduction method: 1. The application of inverter in the wood drying equipment, greatly save energy in drying equipment, using fan iscompared commonly big, and the fan are almost continuous operation, after using the inverter can save 30% energysaving. After the use of frequency converter, on the other hand, the overall equipment will drop a lot of noise, and prolongs the service life of wood drying equipment.

Evaporation of moisture from the wood surface always takes place at a certain temperature, humidity and air velocity. Under normal circumstances, the humidity of the air in the drying kiln is always less than 100%, while the temperature of the air is much higher than normal temperature. Therefore, the equilibrium moisture content of the air is lower than that of the wood surface, and the moisture on the wood surface evaporates into the air. How quickly water evaporates from the wood surface depends on the temperature and humidity of the air. When the air temperature rises or the humidity decreases, the evaporation rate of water on the wood surface is accelerated; on the contrary, the lower the air temperature, the greater the humidity, and the slower the evaporation rate of surface water.

wood drying curve When the wood is dried in a gaseous medium with a certain temperature and humidity, if the change of the moisture content of the wood is measured at regular intervals, and the time is taken as the abscissa and the moisture content is drawn on the ordinate, the curve is called the drying curve. (Figure 1-2). The drying process can be analyzed on the drying curve diagram. The whole process of wood drying can be divided into three stages.

What are the basic concepts of wood drying, do you know?

Before the drying kiln is used, a comprehensive and detailed inspection of its shell and equipment must be carried out to ensure the normal operation of the drying process. The specific inspection contents are as follows:

The first cabinet of wood drying kiln was exported to Chile, and the company developed the new South American market.

Internal stress, also known as internal force, is caused by uneven drying shrinkage. For example, when the surface of wood has started to dry and shrink, and the interior of the wood is still moist, the surface may dry and shrink while the interior does not, resulting in internal stress. When a straight and dry wooden board is sawed into a thin plate, it should immediately experience a phenomenon of warping, which is a manifestation of internal stress in wood. If a sawn wooden board has a convex surface facing inward, it indicates external tension and internal pressure.

As a heat exchange device that can continuously output heat, boilers are used in almost all fields of production. They not only have high efficiency but also greatly reduce the labor cost of enterprises. So, what are the selection methods for steam boilers used for drying wood? What is the special type of dry boiler? Let's learn about Zhongzheng Boiler together.