Economizers are used to heat (A) Condensed Steam, (B) Air (C) Steam (D) Feed water

By BYJU'S Exam Prep

Updated on: September 25th, 2023

Economizers are used to heat feed water. It also goes by the name feed water heater. It is a device that heats the feed water using the waste heat from the flue gases. This kind of questions are asked in competitive exams several times

Why is Economizer used to Heat Feed Water?

  • It is a heat exchanger mechanism in a steam boiler that, in a thermal power plant, heats fluids or recovers leftover heat from the combustion byproduct, i.e. flue gases, before being expelled by the chimney.
  • Economizers decrease steam in the boiler by transferring the heat from the flue gas to the incoming feedwater.
  • In the flue gas stream, the economizer is located before the air pre-heater.
  • The power plant’s efficiency is increased by the economist.

Air preheater:

  • Large boilers found in thermal power plants that generate electricity require air preheaters.
  • Any device created to heat air before another process (such as combustion in a boiler) with the primary goal of improving the process’ thermal efficiency is referred to as an air preheater or air heater.
  • The air preheater’s function is to recover heat from boiler flue gas, which raises the boiler’s thermal efficiency by minimizing the amount of heat that is lost in the flue gas.


  • Using a superheater, wet or saturated steam is transformed into superheated or dry steam.
  • Steam turbines and steam engines, as well as procedures like steam reforming, all employ superheated steam.
  • Although the steam in the superheater is getting hotter, the pressure stays the same as it was in the boiler.


Economizers are used to heat (A) Condensed Steam, (B) Air, (C) Steam (D) Feed water.

Economizers are used to heat the feed water. It heats the feed water by transferring the heat from flue gas. It is commonly known as the feed water heater.

Our Apps Playstore
SSC and Bank
Other Exams
GradeStack Learning Pvt. Ltd.Windsor IT Park, Tower - A, 2nd Floor, Sector 125, Noida, Uttar Pradesh 201303
Home Practice Test Series Premium