The main influencing factors in the drying process
The factors affecting the temperature and humidity stability of humid air are as follows.
(1) Factors affecting the stability of humid air temperature control during the drying process. By controlling the steam in the heater to control the humidity of the humid air, the stability of temperature control mainly depends on whether the area of the heater configured in the wood drying chamber matches the volume of the wood to be dried.If the area ratio of the heater is too small, it will take a long time for the humid air temperature to reach the set temperature, resulting in a large temperature deviation; if the area ratio is too large, the lag effect of heating will increase, that is, after the valve is closed, the heating The device is still filled with a large amount of steam just coming from the boiler, and it will also release heat, making the temperature of the humid air exceed the set value by a large amount, resulting in a large upper deviation of the temperature, resulting in large fluctuations in the temperature of the humid air. The second is the influence caused by the control method of the control instrument. The temperature control process is generally that when the temperature is lower than the lower limit of the set temperature at that time, the heating valve is opened until it reaches or exceeds the set upper limit of the temperature control. The heating valve is closed. This effect will also cause the hysteresis effect of heating, making the temperature control stability of humid air poor.
(2) Factors affecting the stability of wet air humidity control during the drying process. The humidity of the humid air is controlled by controlling the opening and closing of the intake and exhaust valves and the steam injection valve. When the airtightness of the drying room is good, the stability of the humidity control mainly depends on the control method. In the normal drying stage, when the drying room is humid When the air humidity is higher than the set value, open the intake and exhaust valves, and close the intake and exhaust valves when the humidity drops to meet the drying requirements; in the stage of wood spraying and steaming, when the humidity in the drying room is lower than the lower limit of the set value, open Steam spray valve, close the steam spray valve when the humidity reaches the requirement.
Fujian Zhangping CHIQIN Technology Co. Ltd, is professional in wood drying over 20 years, covering Aluminum Wood Drying Kiln, Heat Pump Wood Drying Kiln without heat source, Veneer Drying Equipment, Food Drying Kiln, Kiln Components etc with high quality and reasonable price. Hope to establish business relationship with you!
