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. In the flue gas stream, the economizer is located before the air pre-heater.
- 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 is staying the same as it was in the boiler.
Economisers are used to heating: (a) condensed steam (b) air (c) steam (d) feed water
Water used as feed is heated by economisers. It heats the feed water with the help of waste heat from flue gas.
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