What is the function of a feedwater heater?

The function of a feedwater heater is to preheat the water before it enters the boiler. By doing so, it increases the efficiency of the boiler system. Preheating the feedwater reduces the amount of energy required to convert the water into steam, as the water is already at a higher temperature when it enters the boiler. This process helps to improve overall thermodynamic efficiency and can lead to a reduction in fuel consumption, ultimately benefiting the operation of the boiler system.

Maintaining pressure levels in the system is a critical function of other components, such as pressure relief valves and control systems, but it is not the primary role of a feedwater heater. Likewise, cooling down steam before it re-enters the boiler and measuring water levels are functions associated with different equipment. The feedwater heater's main emphasis is on the efficient preheating of water to enhance the boiler's performance.