Drying process of fruits and vegetables in a multi-layer horizontal belt dryer

The principle of hot air drying is that hot air is in contact with the material to produce heat and moisture exchange, so that the material is dry. During the drying process, the temperature and humidity of the hot air are the two major factors that determine the dry effect. At the same time of heat exchange, the hot air and the surface layer of the material in contact also form a wet difference, forming a dehumidification process. The amount of hot air flowing through the material layer and the flow rate must be ensured at the same time to complete the heat exchange and the removal of helium. Local heat should be avoided to damage the quality of the material and prevent local supercooling from affecting the drying rate. Hot air drying is a complicated process of heat and mass two-phase exchange. Most of the drying of fruits and vegetables adopts hot air drying method, and almost all fruits and vegetables can be dried with hot air. Hot air drying has the advantages of low investment, low cost, simple operation, convenient maintenance, good economic benefit and wide application range.
The factors affecting hot air drying of fruits and vegetables, in terms of internal factors, are determined by their chemical composition and their structure; for external factors, the factors affecting the temperature are the temperature and humidity of the drying medium and its wind speed. The disadvantage of hot air drying of fruits and vegetables is that in hot air drying, due to poor airflow organization and uneven temperature of hot air in contact with the material layer, the temperature difference between the surfaces of the material layers during drying can reach several tens of degrees, resulting in uneven drying. The atmosphere makes the drying efficiency lower, the quality is poor, and the energy is wasted. Therefore, in the future research, we should strengthen the research on the optimization of the uniform wind and dryer structure in various dryers, and the hot air is more dry. For example, van drying, tunnel drying, belt drying, multi-layer horizontal belt dryers and fluidized bed drying all use hot air as a drying medium.

Up-turned Safe

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