Have you ever heard of the word economizer? What is economizer? Economizer is a heat exchanger that raises the temperatue of the water leaving the highest pressure feedwater heater to the saturation temperature corresponding to the boiler pressure. The process is done by gases leaving the last super heater or the reheater.At the threshold temperature that is where the transfer heat to the superheater-reheater happen, the gases will enter the economizer at 700 to 1000 degrees Fahrenheit. A portion of the energy is used to heat the feedwater.
Hope you learn something from this, see you again in the next post.
