Development of NO(x) reduction system for marine diesel engines by SCR using liquid hydrocarbon distilled from fuel oil as reductant

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Development of NO(x) reduction system for marine diesel engines by SCR using liquid hydrocarbon distilled from fuel oil as reductant

Tokunaga, Yoshiro / Kiyotaki, Gen

In this paper the authors describe the development of the NO(x) reduction system for marine diesel test engine that uses hydrocarbon (HC) distilled from fuel oil as reductant. The findings were obtained through the NO(x) reduction test conducted with the exhaust gas from an actual engine. 1. When using kerosene, with a composition roughly similar to that of the light portion of fuel oil, as the liquid HC reductant, NO(x) reduction performance similar to that of a gaseous HC (propylene) reductant was obtained. 2. The effective data was obtained as follows: the reductant supply level for achieving the required NO(x) reduction performance, the appropriate temperature range to operate the NO(x) reduction system, and the reductant supply method to design the NO(x) reduction system for marine diesel engines in the future. Furthermore, in order to reduce the amount of consumption of reductant, the authors used the combined catalyst system that was made by two kinds of catalysts, that is, Pt/ZSM5 was used for NO oxidization catalyst of the 1st-step, and In/ZSM5 was adopted as the NO(x) reduction catalyst of the 2nd-step. The experiment device based on this system was made, and the NO(x) reduction laboratory test was carried out using gas to simulate the diesel engine exhaust. Consequently, although the amount of reductant could be reduced more sharply than before, it was found out that the deterioration of NO(x) reduction performance arises by SO(x) in exhaust gas. However, the NO(x) reduction performance of In/ZSM5 didn't decline very much on the condition that the rate of NO2 in the NO(x) was raised to 50%.