Description
As part of our focus on developing
green technology, Alfa Laval Aalborg
has developed a superheater system
for auxiliary boilers that provides fuel
savings in connection with the operation
of steam turbine driven cargo
pumps on board tankers.
The savings derive both from a reduced
flue gas outlet temperature of the boilers
and from higher thermal efficiency
of the turbine when running with
superheated steam.
The Aalborg XW superheater (formerly MISSION™ XW superheater) is based
on the same characteristics as our well known
water tube, forced circulation
exhaust gas economizer Aalborg XW
specially designed for heat recovery from
auxiliary boilers.
When applied for heat recovery after
auxiliary boilers, the heating surface and
associated accessories are designed for
the flue gas temperatures and flow rates
of the Aalborg Industries auxiliary boilers
with focus on the operation efficiency
and reliability, thus providing full benefit
of the saved energy during operation of
the cargo pumps.
Without changing the heating surface
of the auxiliary boilers, the exhaust gas
temperature will be sufficiently high for
superheated steam productions. This
ensures the same high efficient auxiliary
boiler operation during saturated steam
operation.
The temperature of both flue gas and
steam will vary insignificantly with the
load on the auxiliary boiler when the
superheater is installed downstream of
the boiler.
The superheater is supplied loose for
installation in the flue gas pipe close to
the outlet of the auxiliary boiler, and
must be supported separately by the ship
structure.
The superheater design allows dry running
when only saturated steam is needed for
general service purposes, i.e. a flue gas
bypass is not mandatory.
The system has been developed in close
cooperation with a reliable supplier of
cargo pumps and steam turbines with a
view to improving the overall total steam
plant efficiency and thereby reducing
emissions from our existing well proven
products. Naturally, the system operates
equally well with other cargo pumps suitable
for superheated steam operation.
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Download Aalborg XW superheater datasheet »
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