Association Technique Maritime et Aéronautique

Numéro : 2575 - Year : 2009

Exhaust gas emission control today and tomorrow - application on MAN B&W two-stroke marine diesel engines

Jean Francois CHAPUY, MAN DIESEL France

 

Symposium on the marine pollution regulations until 2012

Emission control has turned into the most important driving force for development. Hence, this is an area to which extensive development effort is allocated.

With CO2 considered a greenhouse gas, the CO2 concentration in the atmosphere is looked at with some anxiety. In any case, the low speed diesel is the heat engine available for ship propulsion with the lowest CO2 emission. This is possible simply by virtue of its high thermal efficiency.

MAN Diesel has introduced advanced internal methods for emission control on MC/MC-C/ME/ME-C/ ME-B engines for Tier II compliance. New tests have shown that a NOx reduction of more than 70% is possible by means of exhaust gas recirculation (EGR).

Humidification of the engine intake air (by means of SAM) is another method that has shown promising test results. SAM is currently being tested on a full-scale basis on board a car carrier.

As regards CO2, commercial ships transport approx. 90% of all goods traded worldwide, and still represent by far the most efficient way of transportation, with the lowest production of CO2 per weight/million moved.

However, we still see possibilities of increasing the efficiency by means of waste heat recovery and achieving a total efficiency of the fuel energy used of up to 60%! This will not only reduce the CO2 level, but also the amount of emissions of NOx, SOx, PM, CO and HC.

In this paper, the different values for Tier II and Tier III are based on the result of the latest MEPC58 meeting, and the decisions made in May 2008 for the final adoption of revisions of Annex VI and NTC (NOx Technical Code) on 6-10 October 2008.

This paper is written in English

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