after auxiliary engines
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For retrofit and new installations
In the coming years, the marine industry
and shipowners face big challenges as
new environmental legislations have
special focus on the reduction of emissions
from fossil fuels. Therefore Aalborg
Industries has developed an efficient
exhaust gas economizer utilizing the
heat in the exhaust gas from the auxiliary
engines during port stays, which will
significantly reduce the oil consumption
for the oil-fired boiler.
Waste heat recovery concept after auxiliary engines based on a new design of high-efficient
exhaust gas boiler
For several decades, we have installed
WHR systems after the ship’s main engines
and these units are to a large extend
able to meet the vessels steam requirement
during seagoing operation and for
some installations also able to assist with
the generation of electrical power.
The waste heat from the auxiliary engines
has not been considered in the past, but it
actually contains a large energy amount
which can be utilized to assist with the
steam requirements mainly during port
stays, but for some vessels also during
seagoing operation.
The WHR concept has been specially
developed as a customized solution with
special focus on energy generation compared
to return of investment and payback
time can be reduced to 7 months
for a complete WHR boiler system, accessories
and installation onboard the ship.
The normal payback time will be approximately
1 to 1½ year depending on the
number of days, the produced steam can
be utilized (offset against of the steam
requirement from the oil fired boiler) and
the redundancy requirements.
We offer a concept based on well-proven
and innovative solutions to ensure the
best operation conditions and optimal
return of investment. The design of the
heating surface of the WHR boiler is the
result of an enhancement of our wellproven
technologies with a small footprint
and the lowest possible weight to
output ration.
To ensure the most advantageous design,
the WHR boiler concept will be specially
tailored to the individual ship and engine
design with due consideration of existing
uptake back pressure etc.
The concept comes in two designs;
One that requires a steam space in another boiler (e.g. in an existing auxiliary boiler) and
One that has its own steam space.
Why install an economizer
after auxiliary engine(s)?
Able to supply or support the steam
demand during port stay
Cost of steam production (energy) is nearly free
Financially sound investment with very short payback time
Adds a “green” profile to the ship
Lower emission tax when finally agreed
Less maintenance and lower operating costs for the oil-fired boiler
Waste heat recovery economizer