Parameters during wood drying
The most important thing in the wood drying process is to make the parameters in the drying equipment as close as possible to the drying benchmark. The most important parameters in the wood drying benchmark are wood moisture content, air temperature and humidity.The flow rate of air passing through the pile is also one of the main parameters affecting the drying quality of wood, and the heating area ratio in the drying chamber is the main parameter affecting the heating rate. However, when the drying equipment is installed (except for equipment equipped with variable frequency motors), the flow velocity of the air has been determined, and the ratio of the heater will not change. During the heating process, only the pressure of the heating steam and the The influence of external air exchange (the temperature of the external air is related to the air intake temperature and the heat loss of the drying room during ventilation; the humidity of the external air directly affects the drying rate and the ability of the hot air as a heating medium to carry moisture), the current control technology It has not been refined to this extent, so during the drying process, it is mainly to monitor the moisture content of the wood, the temperature and humidity of the humid air in the drying room.
The control objectives of the wood drying control system, namely the moisture content of the dry wood, the temperature and humidity in the drying room, these three are only the control parameters on the surface. In fact, it is necessary to start from the overall drying quality, and control the appearance, drying stress, moisture content uniformity and reduce drying defects of the wood according to specific benchmarks.
The control of wood drying is to adjust the operable components and equipment parts manually or automatically, so as to compensate the influence of various interference factors on the drying process, so that each variable is within the expected range and as close as possible to the desired value. The established wood drying reference parameter values, so as to ensure that the wood drying quality is as close as possible to the expected value.
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