3.2.4 CO

Fig. 17 shows the CO concentration to the presence/absence of the pouring of the reducing agent, but no remarkable trend was found. Even from the change in the CO concentration in the measurement shown in Fig. 15, no remarkable change by pouring the reducing agent was found. Though CO is reduced by promoting the oxidizing reaction of CO similar to HC, CO is also generated by the oxidation of HC and PM at the same time, and as a result, no remarkable trend was found.

Fig. 17 Effect of SCR system on CO

4. Conclusion

In the study, the following are found:

(1) N₂O concentration from Marine Fuel Oil is approximately 10 times as high value as that from Marine Diesel Fuel.

(2) N₂O concentration from a diesel engine is influenced more strongly by sulfur content in fuel than by nitrogen content in fuel.

(3) In using same fuel for a diesel engine, N₂O concentration is influenced by NOx concentration. N₂O concentration increases with an increase in NOx concentration.

(4) In addition to NOx reduction, reduction of N₂O and HC is possible by using this SCR system.

　

References:

(1) L.J.Muzio, J.C.Kramlich, Geophysical Research Letters, Vol.15, No. 12, (1988), 1369-1372.

(2) Ibusuki T, et al, 5th International Workshop on Nitrous Oxide Emissions 1992, (1992), 1.4.1-1.4.6.

(3) Nakajima Y., et al, Proceedings the 22nd CIMAC, Vol.3, (1998-5), 717-727.

(4) Nakajima Y., et al, 3rd International Conference on Internal Combustion Engines: Experiments and Modeling, (1997-9), 465-472.

(5) Craig T.Bowman, Twenty-Fourth Symposium (International) on Combustion/The Combustion Institute, (1992), 859-878.

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