How to use the flue-cured circulation fan?
Tobacco baking cycle fan generally includes an electric motor, a transmission shaft, a bearing seat and a fan blade. The output shaft of the motor is directly connected to the upper end of the transmission shaft through a coupling, and the blade is fixed at the bottom end of the transmission shaft, and is directly driven. In the way, the motor directly drives the transmission shaft to rotate, so the stability during transmission is good, and the bearing on the transmission shaft is not easily worn. There are also diesel engines equipped. In the event of power failure, the diesel engine can be used to drive the fan to rotate, which can prevent the tobacco from being baked normally due to power failure.
The circulating fan is generally easy to disassemble and easy to install, easy to maintain, high in reliability, and easy to use.
In the actual operation, how to improve the energy consumption of the intensive barn, while reducing the energy consumption of the intensive barn, to achieve the effect of energy saving and cost reduction, is closely related to whether the flue gas circulation fan can be used correctly.
During the baking process of the tobacco leaf, the fan is turned on the high speed or low speed, and must be flexibly adjusted according to the temperature, humidity and the change of the tobacco leaf baking.
Use of low speed fan
First, the yellowing stage of tobacco leaves is mainly caused by the wilting and yellowing of tobacco leaves before the baking temperature reaches 46 °C. At this stage, the tobacco leaves lose less water, generally relying on moisturizing and yellowing. A large amount of water is required to promote the yellowing of the tobacco leaves. The fan mainly circulates the air in the baking room, narrowing the vertical temperature and humidity difference between the layers, so that the tobacco leaves are balanced yellow. , consistent dehydration. At this time, the low-speed gear of the high-temperature circulating fan can be used to reduce the wind speed, reduce the evaporation of water, and save power consumption.
Second, the color fixing stage of tobacco leaves, mainly between 52 ° C and 55 ° C, the formation of aroma substances and color fixation. As the tobacco leaves are dehydrated and dried, the gap between the leaves becomes larger and larger. At this stage, the use of low speed gears not only reduces energy consumption, but also facilitates the formation of aroma of the tobacco leaves after roasting and reduces the color difference between the front and back of the tobacco leaves.
Third, the dry-leaf stage of tobacco leaves, mainly after 56 °C to the drying point of the tobacco tendon. Under the premise of ensuring that the wet bulb temperature is stable below 42 °C, the blades are all dry, the hot air flow in the baking room is easy to pass, the moisture of the tobacco leaves is mostly discharged, and the leaf flesh is basically dry. At this time, the tobacco baking high temperature circulating fan is adjusted to the low speed operation. It can reduce wind speed, reduce aroma volatilization, save power consumption and fuel. At the same time, pay attention to when the main vein of the tobacco leaves is dry and the temperature drops below 60 °C, and then stop the machine to prevent the temperature inside the furnace from being too high to burn out the motor.
Use of high speed fan
High-speed gears are mainly used in tobacco leaves that require a large amount of water loss and dry and fixed color of the leaves. First, they are directed to tobacco leaves with large water content, such as tobacco leaves with excessive water on the surface of the leaves or rainy days. When the grilling is started, the high-speed gear is turned on in a short time, and some leaf surface moisture is discharged, and the low-speed gear is used after the water is lowered. The second is to use a high-speed file for the barn with large temperature difference, large amount of smoke, and poor ventilation. Use the low-speed gear after the temperature difference is reduced. The third is the temperature at the temperature of 48 ° C to 55 ° C in the dry leaf fixing process. The main task of the fan is to gradually accelerate the loss of water in the blade and promote the drying of the tobacco leaf. Therefore, it is necessary to increase the firepower and use the high-speed fan to increase the moisture discharge of the tobacco leaf. Promote balanced drying of tobacco leaves.
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