Fruit and vegetable dryer drying, uneven drying and wetting is how to return a responsibility.

The choice of heat source of dryer is very particular. As the supporting equipment of drying equipment, there are many heat source devices, which are usually classified according to the fuel consumed, including coal, fuel, gas and electricity, and can be divided into direct heating drying medium and indirect heating drying medium according to the heat exchange situation. According to the different heating methods, there are several commonly used heat source devices for dryers: for example, the boiler heats water to form steam, and the steam heats the drying medium through the radiator, which is twice indirect heating, and the total thermal efficiency of this method is very low. Secondly, the dryer uses a coal-fired hot blast stove for indirect heating, and directly uses the combustion flue gas as the drying medium (direct combustion furnace). The indirectly heated hot air is clean, and the thermal efficiency is 60 ~ 70%.

The drying capacity of the dryer is related to the dry and wet degree of the material, the choice of heat source and the heated area of the material in the dryer. For materials with high humidity, if the drying is not sufficient, the dried materials will be slightly wet, so it is also important to choose heat sources for different materials. Insufficient heating area and uneven heating will also affect the drying effect of materials. However, when direct heating affects the product quality due to smoke pollution, but the heat energy is fully utilized and the thermal efficiency is high, and there is no effect on mixing a small amount of smoke in the drying material of the dryer, it can be used first. Finally, the dryer uses an oil burner. At present, it is used more and more, and has the advantages of simple operation, rapid temperature rise, stable temperature, convenient control and low use cost. Whether the heat source of the dryer is reasonable or not has a great influence, which involves the investment cost of dryer equipment, hot air temperature, drying quality of materials, drying cost, environmental protection, labor intensity of personnel, automatic control level and so on. If the material is too wet when entering the dryer, it is not conducive to the control of heat, and it is easy to cause the material to be heated too fast, which will destroy the drying effect of the dryer. Blocky materials or poor ventilation will cause uneven heating, and finally the expected drying effect of the dryer cannot be achieved due to local heating.