Combustion and Thermal Parts Platform

Grain drying means that the grain with high humidity after harvest is dried by hot air or other means to reduce its moisture content and prevent mold, germination and loss during storage. The principle of grain drying is to use hot air to heat food and evaporate water, so that its moisture content is reduced to a safe storage level. First, the principle of grain drying is based on the physical process of water evaporation. When the surface temperature of the grain is higher than the ambient temperature, the water on the surface of the grain will evaporate. By heating the air, the relative humidity of the air can be increased to promote the evaporation of water, so as to achieve the effect of drying. This process is achieved through the transfer of heat and water between the hot air and the surface of the grain. Secondly, the principle of grain drying also involves the process of air circulation and heat transfer. In the drying equipment, the hot air is sent to the drying room by the fan to evaporate the water on the surface of the grain. At the same time, the air with higher humidity is discharged to keep the relative humidity in the drying room appropriate. This process of air circulation and heat transfer helps to speed up the drying speed of grain and improve the drying efficiency. In addition, the principle of grain drying is also closely related to heat transfer and heat transfer methods. In the drying equipment, the hot air obtains heat through the heating element and then transfers it to the surface of the grain to raise its temperature. As the surface temperature of the grain rises, the water begins to evaporate. The heat transfer methods used by different drying equipment also have their own characteristics, some through convection heat transfer, some through radiation heat transfer, and some through the composite heat transfer of convection and radiation. Finally, the principle of grain drying also includes the control of temperature, humidity and time in the drying process. In the drying equipment, by controlling the temperature of the heating element and the running speed of the fan, the temperature and humidity of the hot air can be adjusted, so as to control the environmental conditions in the drying room. At the same time, according to different kinds of grain and different drying requirements, it is also necessary to set different drying times to ensure the effect of grain drying. In general, the principle of food drying is based on the physical process of hot air heating and evaporating water to food, involving air circulation and heat transfer, heat transfer and heat transfer methods, and the control of temperature, humidity and time during the drying process. Through reasonable drying equipment and operation methods, grain drying can be effectively realized to ensure the storage quality and safety of grain.