Troels Dyhr Pedersen.indd - Solid Mechanics
Troels Dyhr Pedersen.indd - Solid Mechanics
Troels Dyhr Pedersen.indd - Solid Mechanics
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15<br />
12<br />
9<br />
6<br />
3<br />
0<br />
1000 RPM, MEOH 1800 RPM, MEOH<br />
1000 RPM, EGR 1800 RPM, EGR<br />
THC [g/kWh]<br />
Engine power [kW]<br />
0 10 20 30<br />
Figure 15: Specific HC emissions<br />
The DOC reduced the concentrations to a much lower level, although the conversion efficiency dropped with<br />
high EGR levels where oxygen concentrations were lowered. Methane conversion was not good at low exhaust<br />
temperatures, but improved at loads as temperature increased.<br />
CO<br />
Carbon monoxide was measured both on a low scale (0-5000 ppm) and on a high scale (0-20 vol. %). The low<br />
scale was used up to the limit when possible for best accuracy. The emissions are plotted in figure 16.<br />
2<br />
1<br />
0<br />
1000 RPM, MEOH 1800 RPM, MEOH<br />
1000 RPM, EGR 1800 RPM, EGR<br />
CO [g/kWh]<br />
Engine power [kW]<br />
0 10 20 30<br />
Figure 16: Specific CO emissions<br />
In general, CO emissions are both due to wall quenching and crevice effects, which give low amounts of CO. In<br />
case of incomplete combustion however, CO levels will increase dramatically. This is seen in figure 16 in some<br />
cases. At 1000 RPM with EGR the combustion efficiency is deteriorated at the highest EGR setting. At 1800
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