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Exhaust emissions reduction technology for marine diesel engines and gas turbines

Everyone is more aware these days of environmental issues. Gradually efforts are being made globally to curb pollution in all its forms. This paper reviews the various types of exhaust gas emissions of large diesel engines and gas turbines and the possible measures for controlling such emissions in marine installations. Exhaust gases emitted from large diesel engines and gas turbines comprise nitrogen, oxygen, carbon dioxide and water vapour with smaller quantities of carbon monoxide, and oxides of sulphur and nitrogen, together with even lesser quantities of partially reacted and unburned hydrocarbons and particulate material. In January 2000, exhaust emissions control was extended to marine diesel engines and gas turbines worldwide through the regulations of the International Maritime Organization (IMO). The most important gas component that has to be reduced in diesel and gas turbine exhaust emissions is NOx. This paper will predominantly deal with NOx emissions and will give only basic indications of how other emission components might be reduced in the future. To reduce the exhaust emissions of today’ s diesel engines, both primary and secondary measures may be applied. Primary measures focus on decreasing the production of emission components during combustion whereas secondary measures deal with the abatement of the emissions in the exhaust gas. Similary, emission control methods of today’ s gas turbines vary with both internal turbine and external exhaust system emission control.

Exhaust emissions reduction technology; marine diesel engines; gas turbines

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