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A whole range of technical innovations are being employed to reduce the environmental footprint of modern ships and underline their position as the most environmentally sustainable means of transport. Propulsion systems are at the heart of these improvements, perhaps not surprisingly, as it is the emissions from marine engine exhausts which are often indicated as a source of unwanted atmospheric pollutants.
More efficient marine engines enable fuel to be burned to produce the optimum use of that energy, by reducing wasted effort and the quantity of fuel. Ensuring that the engine is “in tune” and performing as well as it can is the first step in this process. This requires engineering skills of a high order, and good routine maintenance, along with the use of the most suitable fuel and lubricants. Harmful emissions are reduced in a well run engine.
Efficiency and environmental benefit also result from minimising the amount of waste heat that is exhausted into the atmosphere, and here useful gains are made if that exhaust heat can be usefully employed to drive exhaust gas generators or to provide domestic heating for the ship. Exhaust gas turbochargers, which have been around for a very long time, have also come into their own with the need to reduce both CO2 and NOx from exhaust gases. Waste heat recovery is a “win-win” concept, improving efficiency and reducing harmful emissions....
http://www.hellenicshippingnews.com/index.php?option=com_content&task=view&id=93701&Itemid=94
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