The optimum combination can be selected depending on the operating mode and the environmental regulations in accordance with these performance test results.
4.1 6ADD30V for 3.1MW Power Plant
The power plant using 6ADD30V (3,290kW x 720rpm) has been put into service under WSS (Weekly Start & Stop) operating mode in Mitsui's Tamano works since April 1st, 1997, using heavy fuel oil (180cSt/50℃).
Fig.7 shows the engine performance curves. The specific fuel oil consumption of 184g/kWh is obtained, optimized at full load. The dust concentration is as low as 0.024g/Nm3.
Fig.8 shows the measured temperature of cylinder parts at full load. The temperature levels are acceptable for the piston as well as for the bore-cooled cylinder cover and liner. The temperature level of the main valve is higher than that of the exhaust valves for the conventional four valve system, but satisfactory in comparison with the exhaust valves of two stroke diesel engines.
8,000 operating hours were accumulated by the end of July, 1998. The availability reached up to more than 98% for this period and a very high degree of reliability was demonstrated through a few times of scheduled overhaul inspections which were carried out as a pilot plant.
Fig. 8 Performance Curves of 6ADD30V
Fig. 9 Measured Temperature of Cylinder Parts
(3.1MW Power Plant)
4.2 6ADD30V for Diesel-Electric Propulsion System
The first two sets of 6ADD30V (2,980kW x 720rpm) for Japan Maritime Agency were built and subjected to the shop trial between 1996 and 1997.
The performance curves are shown in Fig.7. The atomizers and the swirler were optimized to cope with the low load operation for a long expected period in service. The specific fuel oil consumption was reduced by more than 7g/kWh below 50% load as compared with that of the 3.1MW power plant, while losing 3g/kWh at full load. The dust concentration was 60% lower than that of the power plant at 50% load.
The 500-hour endurance test and the cycle test were carried out satisfactorily after the performance test according to the regulations of Japanese Government.
The engines were used for the main diesel-electric propulsion system of the observation vessel, in which the special attention was paid to noise and vibration by utilizing the compactness and the light weight of the ADD30V engines. The engines, which are accurately balanced by the moment compensator, are resiliently mounted and covered with the common package. The vessel has been in service since March 20th, 1998.
