Start of the drying chamber: close the inlet and exhaust passage; Start the fan. For the reversible drying chamber with multiple fans, start the fan one by one to avoid circuit overload. Open the valve of the bypass pipe of the trap and slowly turn on the heater to slowly heat up the heating system. At the same time, discharge the air, water and rust in the pipe system. When a large amount of steam comes out of the bypass pipe, close the valve of the bypass pipe, open the trap valve, and make the flow pipe work normally. When the indoor dry bulb temperature rises to 40~50℃, it shall be kept warm for 0.5h to preheat the wall and wood surface of the drying chamber, and then gradually open the heater valve and spray steam appropriately to make the dry and wet bulb temperature rise to the medium state required by preheating treatment at the same time. When entering the drying stage after treatment, the inlet and exhaust pipes should be opened. Then operate according to the process requirements.
(2) pre-heating of sawwood. After the wood drying chamber is started, the wood is preheated first. And heat treatment is the purpose of heating and heat through wet wood, make the moisture content is consistent with the direction of the gradient and temperature gradient, eliminate the growth stress of wood, for dry wood and air dried wood and eliminate the effect of surface stress, for raw materials and wet material, preheating treatment can make the evaporation of moisture, moisture content is on the high side of wood moisture content uniformity. At the same time, preheating treatment can also reduce the viscosity of fiber saturation point water, make the capillary expansion of the wood surface, and improve the speed of water movement on the wood surface.
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