Forced circulation evaporators for food concentration. Follow the equipment circuit, examine your material constraints and build a project requirement that can be evaluated.
Keep the loop moving. The circulation pump sets the flow through the heater. That flow is distinct from the incoming feed and from the mass of water evaporated. Selection must follow the concentrated liquid throughout the planned operating range, including start-up and restart after cooling.
Add heat under pressure. In the common non-boiling heater arrangement, pressure in the circuit limits boiling within the heater. Heat is added before the liquid enters the flash zone. Tube or plate geometry is selected from product behaviour and pressure-drop constraints, rather than the circulation label alone.
Release vapour and retain liquid. The pressure change at the separator enables part of the heated liquid to flash. The vessel provides space for vapour disengagement while maintaining liquid inventory for recirculation. Its level and geometry therefore affect both separation and pump suction.
Recirculation is a design choice. Its trade-offs need a common basis.
Compare pump demand, thermal history, shear, fouling and maintenance at the same evaporation load. A staged arrangement may combine different evaporation methods.