Niigata Power Systems Co., Ltd. (NPS) has developed new medium speed diesel engine '28AHX' which covers output range of 2070-3330 kW by inline 6-9 cylinder engines. In recent years, as container ships become bigger size, the higher output of tug boat is demanded in the world. Also demand of supply vessels of PSV (Platform Supply Vessel) and AHTS (Anchor Handling Tug Supply) vessel are increased. To accommodate to this market demand, this new engine has been developed for the main engine driving azimuth type propulsion system 'Z-peller' mainly. 28AHX has 280 mm bore and 390 mm stroke, and its maximum output is 370 kW/cyl. at 800 min-1, and 345 kW/cyl. at 750 min-1 respectively. The engine can comply with the exhaust emission regulations in the next stage such as IMO NO(x) Tier II, and it is considered the performance of low load operation and transient response as a main propulsion engine. To achieve these performance targets for the environment without increase of the specific fuel consumption, the following technical expedients are applied. - Optimization of combustion: piston design and injection system etc. - Miller cycle and optimization of intake and exhaust valve timings - Adoption of variable intake valve timing mechanism - Improvement of a turbocharging system : air bypass and waste gate In addition, for the purpose of the decrease of engine and auxiliary equipment space in the engine room, and of easy maintenance, the following construction is designed. - 'Cylinder unit' : assembling of cylinder parts - 'Front end unit' : integrated unit of auxiliary machinery on engine front side This paper reports the design feature and engine structure of 28AHX, and also the performance and mechanical results of the prototype engine. The engine performance are well accepted, especially the quick load increase operation characteristic is very good. The fuel consumption is improved compare to existing medium size engine of Niigata, even 28AHX keeps Tier II NO(x) emission.
Development of NIIGATA new medium-speed diesel engine "28AHX"
2010
10 Seiten, 20 Bilder, 1 Tabelle, 1 Quelle
Conference paper
Storage medium
English
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