each type of drying device has its own specific application range, and each type of material can find several types of drying devices that can meet basic requirements, but only one type can be most suitable. if improperly selected, users must not only bear unnecessary one-time high procurement costs, but also pay a heavy price during the entire use period, such as low efficiency, high energy consumption, high operating costs, poor product quality, and even the fundamental not working properly and so on.
the following is the general principle of drying equipment selection. it is difficult to say which one or several items are the most important ones. the ideal selection must be focused according to one's own conditions, and sometimes the trade-off is necessary.
1. applicability ------- the drying device must first be able to apply to specific materials and meet the basic use requirements for material drying, including the ability to handle the material well (feed, transport, fluidization, dispersion, transfer heat, discharge, etc., and can meet the basic requirements of the amount of processing, dehydration, product quality and so on.
2. high drying rate—only considering the drying rate, the convection drying material is highly dispersed in the hot air, the critical moisture content is low, the drying speed is fast, and the same is the convection drying, and the drying method has different critical moisture content. the drying rate is also different.
3. low energy consumption ------- different drying methods have different energy consumption indicators. in general, the thermal efficiency of conduction drying can theoretically reach 100%, and convection drying can only be about 70%.
4. save investment ----- complete the same function of the drying device, sometimes the cost difference between them, should choose the lower one. the
5. low operating costs - equipment depreciation, energy consumption, labor costs, maintenance costs, spare parts costs ... and other operating costs should be as low as possible.
6. priority should be given to selecting desiccators with simple structure, adequate supply of spare parts, high reliability, and long life. the
7. meet environmental requirements, working conditions, and high safety.
8. before the selection, it is best to make a drying experiment for the material, and to have an in-depth understanding of the drying devices (advantages and disadvantages) that have been used for similar materials, which are often helpful for proper selection.
9. not relying entirely on past experience, focusing on absorbing new technologies and listening to the opinions of experts.
