15

1980 1990 2000 2010 Year

Figure 3.4 NOx emission trends for typical two-stroke and four-stroke diesel engines compared with IMO requirements (Wartsila)

Figure 3.5 Methods of reducing NOx emissions from marine diesel engines (Mitsubishi Heavy Industries)

New generations of medium speed engines with longer strokes, higher compression ratios and increased firing pressures addressed the NOx emission challenge (Figure 3.6). The low NOx combustion system exploited by Wartsila throughout its medium speed engine programme, for example, is based on an optimized combination of compression ratio, injection timing and injection rate. The engine parameters affecting the combustion process are manipulated to secure

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