In the pile, two adjacent layers of wood should be evenly separated by spacers, forming a horizontal airflow channel at the height of the pile. In the middle of these passages, the drying medium and the surface of the wood carry out heat and moisture exchange that is conducive to the gradual drying of the wood.

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Wood carbonization, also known as wood high-temperature heat treatment (Thermal Modification), is an environmentally friendly wood that uses water vapor, inert gas, oil, water, etc. as heat-conducting media to perform short-term pyrolysis treatment on wood at a temperature of 160-250 °C. Physical Protection Technology.

Wood drying is the process of heating the wood under the condition of controlling the medium temperature and relative humidity, so that the internal moisture of the wood moves to the surface, the surface moisture evaporates to the outside, and the process of gradually removing moisture from the wood. In order to achieve effective drying quality, it is necessary to control the temperature and humidity of the drying medium, and adopt a reasonable drying process and operation method. The more common method used at present is the method of convection drying.So what are the benefits of drying wood? There are mainly the following aspects:

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

Classification According to the performance and application of the product, carbonized wood can be divided into two categories: indoor use and outdoor use. In addition to the requirements for appearance quality, the former mainly requires dimensional stability. The tangential swelling and drying shrinkage of the wood is required to be 6-8%, and its corrosion resistance level is required to be grade Ⅲ—slight corrosion resistance; the latter, in addition to In addition to the requirements for appearance quality, the main performance requirement is biological corrosion resistance, and its corrosion resistance level is required to be level II—corrosion resistance. In addition, the chordwise swelling and drying shrinkage of wood are required to be 5-6%.

There are many ways to dry wood. According to the discharge method of moisture in wood, it is divided into three types: thermal drying, mechanical drying and chemical drying. The actual wood production process uses thermal drying. Thermal drying can be divided into atmospheric drying (referred to as air drying, also known as natural drying) and artificial drying according to whether the drying conditions are artificially controlled or not. Artificial drying can be divided into kiln drying (including low temperature, conventional and high temperature kiln drying), dehumidification drying, solar drying, vacuum drying, high frequency and microwave drying, infrared radiation drying and contact (hot pressing) drying. These drying methods are outlined below.

When wood is carbonized, if the process or operation is improper, many defects will occur, mainly including cracking, deformation, uneven color, knot falling off, and even fire. However, if the causes of these defects are mastered, basically these defects can be prevented.

The brick-concrete structure of the traditional drying room shell is low in cost and easy to build. However, there are some problems in the use of brick-concrete structure shells, such as poor corrosion resistance and cracking of the shell. In particular, the cracking of the shell not only increases the heat loss of the drying chamber, reduces the airtightness, and accelerates the destruction of the shell due to the intrusion of corrosive gases, but also seriously affects the normal use of the drying chamber. Therefore, precautions must be taken in the design and construction of the shell.

Fundamentals of Wood Drying Through the above introduction, we already know that the moisture in wood is mainly composed of two kinds of moisture, that is, free water and absorbed water. The moisture existing in the large capillary system composed of cell lumens is called free water, and its increase or decrease only affects the weight of wood, but not the properties of wood; the moisture existing in the microcapillary system composed of cell walls is called absorbed water. Its changes not only cause the wood to shrink and expand, but also affect other physical and mechanical properties of the wood.