In order to meet stringent emission standards for marine diesel engines, we NIIGATA continue the development of low emission combustion technology and apply the right means to commercial engines according to the emission standard requirement. Our portfolios of marine diesel engine are widely provided. The low, medium and high speed engines which engine speeds from 290 to 1950 min-1 are manufactured and delivered for various types of ship applications by NIIGATA. The low emission combustion technologies to comply with IMO NO(x) emission standard are required for these various products independently of engine speed. The low NO(x) emission technology consists of the miller cycle and the optimization of fuel injection are considered for every speed of diesel engines, and are also confirmed the feasibility of the reduction of NO(x) emission to meet IMO NO(x) Tier II. It is confirmed that there are the possibility way of further NO(x) reduction as optimizing earlier miller timing, higher boost pressure and fuel injection timing. This emission control technology and engineering findings are applied for new designed 28AHX diesel engine. This newly developed marine diesel engine, 28AHX, can be complied with IMO NO(x) Tier II by engine itself and also keep the good level of fuel consumption from low load to high load. The cylinder size is 280mm, the output power per cylinder is 370 kW. However, the described 28AHX paper will be presented at another session on this CIMAC Congress. When the selective catalytic reduction (SCR) systems will be employed as NO(x) reduction method to meet IMO NO(x) Tier III, the SCR device should be small and compact design to appropriate with the short in height and narrow engine room for medium speed engine. Since the size of SCR device depends on reduction ratio of NO(x) emission, it is necessary to focus on the improvement of emission reduction of diesel engine as the small size of the SCR device. Furthermore, the engine test with extreme miller timing and boost pressure is carried out to aim for remarkable NO(x) emission reduction well over the IMO NO(x) Tier II requirement. Through these investigations, new challenges on engine design like higher exhaust temperature are confirmed. In this paper, the obtained results are shown as the effect of the optimized injection and miller cycle on NO(x) emission, respectively. Moreover the promising emission control technologies for further emission regulation are described.
Emission control technology by Niigata, the clean marine diesel engine for low speed, medium speed and high speed
2010
11 Seiten, 22 Bilder, 4 Quellen
Conference paper
Storage medium
English
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