What is the typical temperature at the economizer exit?

The economizer is an essential component in a boiler system that recovers waste heat from flue gases to preheat feedwater before it enters the boiler. This process enhances the overall efficiency of the system by reducing the amount of fuel needed for heating.

The typical temperature at the economizer exit varies based on factors like the design of the economizer, the type of fuel used, and the specific application. However, in many boiler systems, the economizer exit temperature is often around 600°C, especially in high-capacity industrial boilers.

This relatively high temperature is crucial for effective heat transfer and to ensure that the water feed is sufficiently heated before entering the boiler. Keeping the exit temperature around this range also helps in maintaining proper condensation levels and preventing issues like corrosion or scaling, which can occur if the temperature drops too low.

Other temperatures provided in the options either fall considerably below or above the expected range for economizer exit temperatures in typical applications, making them less representative of standard practices.