Feed Water Heater

1. STEAM GENERATORS
FEED WATER HEATERS
Dr. S. VIJAYA BHASKAR
PROFESSORINMECHANICALENGINEERING
SREENIDHIINSTITUTEOF SCIENCE& TECHNNOLOGY
GHATKESAR,HYDERABAD,TS, INDIA

2. A feedwater heater is a power plant component
used to pre-heat water delivered to a steam
generating boiler.
In a steam power plant,feed water heaters
allow the feedwater to be brought up to the
saturation temperatur very graduallythat
improves the thermodynamic efficiency,
reducing plant operating costs and
also helps to avoid thermal shock
to the boiler metal.

4. Open FeedWater Heater
TYPES OF FEEDWATER HEATERS
Closed FeedWater Heater
 An open heat exchanger is
one in which extracted steam
is allowed to mix with the
feed water.
 This kind of heater will
normally require a feed pump
at both the feed inlet and
outlet since the pressure in
the heater is between the
boiler pressure and the
condenser pressure.
 A deaerator is a special case
of the open feedwater heater
which is specifically designed
to remove non-condensable
gases from the feedwater.
Closed feedwater heaters are
typically shell and tube heat
exchangers where the feedwater
passes throughout the tubes and
is heated by turbine extraction
steam. These do not require
separate pumps before and after
the heater to boost the feedwater
to the pressure of the extracted
steam as with an open heater.
Many power plants incorporate a
number of feedwater heaters and
may use both open and closed
components. Feedwater heaters
are used in both fossil- and
nuclear-fueled power plants.

5. OPEN FEEDWATER HEATERS
 An open heat exchanger is one in which
extracted steam is allowed to mix with the
feedwater.
 This kind of heater will normally require a
feed pump at both the feed inlet and
outlet since the pressure in the heater is
between the boiler pressure and the
condenser pressure.
 A deaerator is a special case of the open
feedwater heater which is specifically
designed to remove non-condensable
gases from the feedwater.

7. CLOSED FEEDWATER HEATERS
Closed feedwater heaters are typically shell and
tube heat exchangers where the feedwater passes
throughout the tubes and is heated by turbine
extraction steam. These do not require separate
pumps before and after the heater to boost the
feedwater to the pressure of the extracted steam
as with an open heater.
Many power plants incorporate a number of
feedwater heaters and may use both open and
closed components. Feedwater heaters are used in
both fossil- and nuclear-fueled power plants.