What is the primary function of the economizer in a boiler system?

The primary function of the economizer in a boiler system is to recover waste heat from flue gases to preheat feedwater. This component is designed to increase the overall efficiency of the boiler by utilizing heat that would otherwise be lost in the exhaust gases. By preheating the feedwater, the economizer reduces the amount of additional fuel required to reach the desired steam temperature and pressure, thereby improving fuel economy and reducing greenhouse gas emissions. This heat recovery process optimizes the thermal performance of the boiler, ensuring that energy is used more effectively throughout the system.