Marine Diesel Engines – Exhaust Gas Emissions – Paying a Price

By George Backwell at November 16, 2010 12:50
Filed Under: General
Marine Diesel engines have a remarkable ability to work with a variety of fuels, ranging from Heavy Fuel Oil (HFO) to Liquid Natural Gas (LNG) as well as a range of distillates of refined crude oil in between. Not surprisingly the ship-owner's fuel of choice for large two-stroke Diesel engines over the years has been HFO, the low-price by-product of oil refinery output. Onboard fuel oil treatment being taken care of by purifiers/calorifiers prior to fuel injection, and more recently by advanced computer driven fuel cleaning systems.Unfortunately HFO is high in nitrogen, sulfur and ash, greatly increasing the NOx and SOx content in marine Diesel engine exhaust gas emissions, a fact which has led pollution control agencies worldwide – IMO, EU and other, localised, Emission Control Areas (ECA) –  to set progressively exacting limits in revised MARPOL VI.A bleak future for ship-owners who were not already planning for year 2015 (when sulfur limits in the ECA's will be rest... [More]

Dual Fuel Marine Diesel Engines – LNG & MDO – the Way Ahead?

By George Backwell at November 09, 2010 08:05
Filed Under: General
Marine Diesel engines, thanks to enormous technological strides in the past few decades, have proven themselves powerful, reliable and efficient, to the extent that by year 2000 motor ships composed no less than 98% of the merchant fleet. Despite these plaudits, regulatory bodies continue to penalise the Diesel engine for exhaust gas emissions inherent in a combustion process using Marine Diesel Oil (MDO) fuel that almost always leaves by-products of oxides of nitrogen, unburned hydrocarbons, and carbon monoxide in the exhaust smoke.Environmentalists have the expectation that technology will solve all political and economic problems, and will not be disappointed to hear that developers have succeeded in harnessing low emission Liquid Natural Gas (LNG), a  clean fuel with lean burn combustion characteristics, to power the engine invented by Rudolf Diesel in 1897. Many analysts confirm the recent prediction of Klaus Deleroi, Senior V-P, MAN Diesel & Turbo SE, that: "When it come... [More]

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