What to Consider When Choosing a Multi-effect Evaporator
1. Corrosive solutions: When evaporating corrosive solutions, the heating tube should be made of special material or lined with corrosion-resistant material on the inner wall. If the solution is not prone to contamination, a direct heating evaporator can also be used.
The viscosity of the solution, as well as the range of viscosity change during evaporation, is a primary factor to consider in the selection process.
Solution for solutions with crystalline precipitation: Utilize an external heat evaporator or a forced circulation evaporator when crystalline precipitation occurs during evaporation.
4. For solutions with high thermal stability, which are prone to aggregation and scaling when heated for extended periods, a evaporator with minimal retained material and short residence time should be used.
5. Solution Processing Volume: The volume of the solution to be processed is also a factor to consider during selection. It is not advisable to use a scraper-mixed film evaporator when the heat transfer surface area exceeds 10㎡; a multiple-effect evaporation operation is recommended when the heat transfer surface area is over 20㎡.
6. Evaporators used for scaling solutions will inevitably accumulate dirt on their heat transfer surfaces over time. The dirt layer has a low thermal conductivity, so for scaling solutions, it is advisable to consider evaporators that are easy to clean and have a high solution circulation rate.
