【作者】

Bert Buchholz

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC大会上发表，论文的版权归CIMAC所有。ABSTRACT The marine and large diesel engine industry faces huge challenges regarding the significant reduction of harmful emissions. Over the past years, the contribution of shipping emissions to the overall emissions has increased, which brings ship engine emissions in the focus of a growing public debate. As a consequence of this public debate, efficient solutions for a significant reduction of particulate emissions could soon become necessary for certain engine applications. Cruise ships and ferries as well as vessels operated in sensitive regions (e.g. arctic waterways) feel the pressure for particulate filter installations in addition to the NOX and SOX abatement technologies which are required to comply with the IMO limits. Over the last decade, diesel particulate filters (DPF) have been successfully applied to nearly all on-road diesel engines (car and truck) and in many off-highway applications inside the EU. Significant reductions of PM emissions and impressive reliability levels have been obtained. Nevertheless, a successful transfer of the DPF technology to marine engines is still a huge challenge and requires ongoing research and development efforts. High ash loads, low exhaust gas temperatures and very low permissible pressure drops in the exhaust gas system are only some of the special challenges for DPF solutions in the maritime sector. These special requirements will be discussed in the first chapter of the paper. The paper then presents the findings of a comprehensive experimental project to obtain fundamental information on the particulate emission of medium speed diesel engines. The influence of fuel quality and engine load on the particulate emission was established. The test engine was operated with HFO, MDO and clean on-road diesel fuel (EN 590). Particulate emissions were sampled at different load points along the propeller and generator curves. Finally, the influence of increased injection pressure and increased injection flexibility was analysed using a CR injection system. The PM measurement equipment consisted of a Smart Sampler dilution tunnel for PM mass measurement, particle counter and particle sizer and a FSN measurement for comparison. Following the gravimetric analyses to determine PM mass, the loaded filters from the smart sampler were further analysed to determine the PM composition of organicsoluble, anorganic-soluble and soot components. For selected engine test points the PM emissions were further analysed regarding their reactivity which is considered as a parameter to describe the ignitability of the PM load in a DPF during filter regeneration. The reactivity analyses were carried out with an adapted thermo-gravimetric analysis procedure.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

2

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