When the vapor pressure of the water on the surface of the solid material is greater than the partial pressure of the water vapor in the drying medium, the water on the surface of the material will continue to vaporize and enter the air, and the water inside the material will continue to diffuse to the surface of the material.
干燥推動力為物料表面水的蒸汽壓與干燥介質(zhì)中水蒸汽的分壓的差值。
The drying driving force is the difference between the steam pressure of water on the material surface and the partial pressure of water vapor in the drying medium.
In view of our customers' questions about the selection of dryer recently, our engineers summarized the following factors to be considered in the selection of drying equipment, hoping to have a reference basis for our customers in the selection:
1.干燥機的生產(chǎn)能力,物料的進(jìn)給方式(間歇/連續(xù))
1. Production capacity of dryer and feeding mode of materials (intermittent / continuous)
2.濕物料的物理,化學(xué)及生化特征,以及對產(chǎn)品的質(zhì)量要求;
2. Physical, chemical and biochemical characteristics of wet materials and quality requirements for products;
3.順流或者逆流生產(chǎn)工藝
3. Downstream or countercurrent production process
4.原料和產(chǎn)品的含量
4. Content of raw materials and products
5.干燥動力學(xué)特征,濕物料的吸濕等溫線
5. Drying kinetic characteristics, moisture absorption isotherm of wet materials
15. Industrial considerations: the drying of food and biological products needs to comply with GMP regulations and the design and operation requirements of sanitary equipment.