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Why are economizers used in boilers?

Hii,
This post is specifically for Mechanical engineering students studying power plant engineering.You must have a knowledge of boilers,turbines,condenser and feed pumps and of course cooling towers.But have you come across the term economizers.Well of course you would have.Now I will explain why it is used.Bassicaly it is an accessory and not main component but has a huge impact on the life of boilers.Well after condensation when the water is sent back to boiler via feed pump its temperature is considerably low as compared to boiling temperature so it is needed to send this water after giving it heat so that after entering boiler it does not take much time to be heated.Thus it is passed through economizer to increase its temp before entering boiler.This saves lot of fuel which would have been needed without economizer.So it is economical to use economizer.Now you must have got the point why it is called so.Another benefit of using economizer is that it prevents cracking of boiler which would have been caused due to temp difference between boiler and cold water coming from feedpump in absence of economizer.
Thanks...

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