Explain what a “flash tank” does in a feedwater system.

A flash tank plays a crucial role in feedwater systems by allowing high-pressure condensate to rapidly reduce pressure, which causes a portion of the water to evaporate and turn into steam. This process effectively recovers energy from the condensate before the remaining water is returned to the system.

The steam produced in the flash tank can be reused, which enhances the overall efficiency of the system by utilizing energy that would otherwise be wasted. By incorporating a flash tank, operators can improve the thermal efficiency of their feedwater systems, ensure effective heat recovery, and maintain optimal operational conditions. This principle is key in maximizing energy use in steam systems.