Hot air dryers are becoming more and more popular. They refer to the hot air flow entering the continuous hot air dryer. They are not reheated in the dryer. When drying, they only consume their own sensible heat, that is, outside the ejector, which is needed during the drying process. At the same time, the transfer of heat and mass (moisture) is completed to ensure that the moisture partial pressure (concentration) of the surface of the material is higher than the partial pressure of moisture in the external space to ensure that the temperature of the heat source is higher than the temperature of the material.
It is mainly used for the drying of agricultural and sideline products such as fruits and vegetables, Chinese herbal medicines, pet foods, etc. Due to the use of hot air convection heating, there is absolutely no pollution to the products, which is in full compliance with food hygiene standards. Hot air is recyclable and thermal efficiency is significantly improved. The baking tray can be made of plastic mesh plate or stainless steel mesh plate, and can also be flexible and convenient by using wooden strips, wire mesh, bamboo nets and sieves.