To increase the boiler efficiency, the
feed water is heated further using flue gas. This section of heat recovery
coils are known as Economizers.
Main criteria are that the steaming shall
be avoided for smooth flow of feed water in to drum. Otherwise hammering will
take place in the feeder tubes.
The flue gas temperature at the exit of
economizers shall be maintained well above Sulphur
A feeder pipe with non return valve and an
isolating valve (for maintenance) will be connected at the bottom header of the
economizer. This keep the water level in the economizer will be same as that of
drum when there is no feeding from boiler feed pump. This will avoid
evaporation in the economizer.
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