What is the most common recirculation rate for an overfeed evaporator?

The most common recirculation rate for an overfeed evaporator is a 4:1 recirculation rate. This means that for every part of the syrup that is removed from the evaporator, four parts are recirculated back into the system. A 4:1 ratio helps maintain efficient thermal performance and adequate contact between the syrup and the heating surface, which is essential for optimal evaporation.

This rate balances the need for maintaining high evaporator efficiency while avoiding issues linked to excessive recirculation, like increased viscosity or potential fouling. It allows the system to effectively transfer heat while still processing a substantial volume of syrup, thus creating an overall efficient operation for sugar production and other similar applications.

Understanding the significance of the recirculation rate helps operators maintain optimal production variables while ensuring equipment longevity and minimizing waste.