Feed
water heater
A feed water heater
is a power plant component used to pre-heat water delivered to a steam
generating boiler. In a steam power plant (usually modeled as a modified Rankin
cycle), feed water heaters allow the feed water to be brought up to the
saturation temperature very gradually.
Types
Open feed water heater
Closed feed water heater
Feed
water heater with T-S diagram
Advantages
•Preheating
the feed water reduces the irreversibility's involved in steam generation
•Improves
the thermodynamic efficiency of the system
•Reduces
plant operating costs and also helps to avoid thermal shock to the boiler metal
when the feed water is introduced back into the steam cycle.
Air prehater
The purpose of the air pre heater is
to recover the heat from the boiler flue gas which increases the thermal
efficiency of the boiler by reducing the useful heat lost in the flue gas.
Types:
ØTubular
type
ØRegenerative
air pre heater
Schematic
diagram
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