Feature 4
end of 2007 and an additional 14 during
2008. This will reduce NOx emissions
by 25-30%.’
Taking on the wider topic of
greenhouse gases traceable to
shipping, Mrs Blomqvist said: ‘The
only way to reduce greenhouse gases,
and by that I mean CO , is to reduce
2
fuel consumption. We have as our
global [target] a reduction of fuel
consumption of 10% by 2010. The
measure is based on a gram/tonne per
nautical mile. This will be achieved
by a combination of measures, both
operational and technical - (1) trim
and ballast optimisation (2) improved
use of weather routing tools (3)
propeller polishing (4) improved use
of auto-pilots (5) and, where possible,
a reduction of speed. Talisman – one of Wallenius Wilhelmsen logistics’ increasingly environmentally-friendly
‘In my view, reducing emissions car carriers.
per unit transported is dependent
upon the best utilisation of our ships
– optimising the routes and trades going from a two- to a one-pillar row important to us. If we reduce the speed of
they operate in, looking carefully at system on the vehicle decks. our ships we may not be able to make our
the port calls we make, ensuring good ‘Our two latest newbuildings, Faust schedules and many of our customers work
turnaround times, making best use of and Fidelio, have a capacity of 8000 cars to fine deadlines. They require their cargoes
the cargo mix we carry, and ensuring each and a total lengths of 228m – the to be at their destinations on a definitive
that space onboard our vessels is used length of two football pitches. So size day.
to best effect. matters. Speed is always a balance. If ‘At present there is an under capacity in
‘Our elongated vessels (a total of you speed up ships you naturally use the car and ro-ro carrying trades, ie too few
five in Wallenius Wilhelmsen Logistics more fuel per ocean leg but, and this is ships for the cargoes that need to be carried.
service) have an increased capacity a big but, we get our customers’ cargo In a more balanced market we will be able
of 20%, and two vessels delivered to its destination on time and there is to slow down and thereby also achieve
last year have an increased capacity always the possibility to squeeze one lower bunker consumption. We anticipate
of 800 cars, whilst keeping the same more voyage out of the vessels. achieving a better balance by the end 2008/
outer dimensions of the ships. This ‘Balancing our customers’ needs with beginning of 2009 mainly through the
is achieved by a smarter deck design the need to preserve the environment is delivery of additional newbuildings.’ NA
MAN recirculation cuts emissions
practical steps to produce emissions reduction technology are under development at MAn Diesel, as exhaust gas
recirculation (eGr) has recently achieved up to 70% reductions in nox emissions, tested on a 4t50Me-X low-speed test
engine in copenhagen, writes clare nicholls.
the eGr method is based on a reduction of the oxygen content in the cylinder charge and the recirculation of
exhaust gas on the engine side of the turbocharger. During the process, an electrical, high-pressure blower forces the
exhaust gas through a wet scrubber to a higher-pressure scavenge-air receiver. the scrubber cleans the exhaust gas
by removing SOx and particulates, and also cools it through humidification, before reintroduction to the combustion
chamber.
the nox limiting effect is achieved by reducing the local maximum combustion temperatures in the combustion
chamber, and reducing the concentration of oxygen by the addition of inert media with high specific heat: exhaust gas
or water vapour. Judging by these results, MAN said it was confident that the method will be used in large, two-stroke
marine engines in the future, and the company plans to demonstrate the system in service on an ocean-going vessel
within the next three years.
The Naval Architect January 2008 81
NA Jan - p80+81.indd 81 04/01/2008 15:57:40
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