【作者】

Christian Fink,Martin Drescher,Jean Rom Rabe

【摘要】

论文已在上海2013年CIMAC大会上发表，论文版权归CIMAC所有。 The introduction of IMO-TIER ll in 2016demands a reduction of NOx-emissions by 75% compared to IMO-TIER lⅡ. This cut in emissions is only to be achieved by applying new technologies to ship diesel engines. One promising option to reduce emissions by engine internal measures is the introduction of exhaust gas recirculation (EGR). In order to control particulate emissions as well as fuel consumption, this technology can only be applied when significantly improving the fuel injection system at the same time. The presented work focuses on the impact of injection rate shaping on the emissions of a medium speed diesel engine. The approach is based on the idea to generate very specific injection rates, which are referred to have a positive effect on engine emissions, by simple hydraulic considerations. Therefore, the existing common-rail injection system of the medium speed research engine 1 VDS 18/15 has been modified and extensively tested. The engine measurement results show that injection rate shaping significantly influences engine emissions. In certain points, reductions of particulate emissions of up to 70% compared to a reference set-up were achieved at constant NOx while even providing advantages in indicated engine efficiency. It is shown that especially at 50% load conditions a RAMP-like injection rate does offer the highest potential. On the other hand, no advantage is detected for the given conditions at 75% engine load. These results are confirmed by cylinder pressure traces showing how rate shaping influences the pre-mixed and diffusive combustion phase. Based on the engine results it has to be stated that hydraulic measures to control injection rates can have a considerable potential to reduce engine emissions. The possibility to influence the combustion process by applying injection rate shaping allows a fundamental analysis of combustion parameters with respect to emission generation. The presented work so provides an important basis to improve the understanding of emission generation processes in large diesel engines.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

2

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