Broadly, there are two methods by which wood can be dried: natural drying or air drying, and artificial drying. Wood drying kiln provides a means of overcoming the limitations imposed by erratic weather conditions. In kiln drying as in air drying, unsaturated air is used as the drying medium. Almost all commercial woods of the world are dried in industrial kilns. A comparison of air drying, conventional kiln and solar drying is given below:

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.

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.

Wood drying refers to the process of using external energy to convert water in wood into steam and expel it. The drying of wood can be divided into two categories: natural drying and artificial drying.

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.

By usage environment According to the usage environment, it is divided into outdoor grade carbonized wood and indoor grade carbonized wood.

The mature heat treatment processes abroad mainly include Thermo Wood from Finland, Plato Wood from the Netherlands, and Correction from France.