【作者】

Christian Fink

【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 Engine and FIE manufacturers are facing an increased number of complaints on abnormal engine functioning related to internal diesel injector deposits (IDID). Possible consequences are increased emissions, rough engine running and misfiring due to impairments in the timing of the injector, modified injection quantities or sticking injector needles. Along with the introduction of new emission legislations regarding SOx and NOx it is expected that the risk of dysfunctioning may exacerbate for future marine diesel engine applications. On the one hand this is caused by more complex combustion processes utilized for IMO-TIER3 EGR-concepts by means of multiple injection strategies. These concepts rely on sophisticated common-rail injection systems which are, however, potentially more sensitive against injector internal deposits then conventional mechanical unit pump injection systems. On the other hand the introduction of substantially reduced sulfur oxide emission limits in the sulfur control areas (SECA) demand frequent changes of the fuel type, i.e. from HFO to MDO and back when entering and leaving SECAs unless SOx scrubbers are installed on the vessels. Changing the fuel can be accompanied with the fall out of specific insoluble fuel components because of mixture incompatibilities of the different fuel types followed by increased generation of deposits in the injection system of an engine. In order to understand the different processes implied, this work describes the basic mechanisms and influencing parameters on the formation of fuel related deposits. These results have been obtain from extensive experimental measurement campaigns, theoretical modelling of the fuel oxidation process and comparison with the literature. The experimental work implies laboratory scale tests as well as durability runs with real common-rail injectors at engine like conditions. Different analytical methods were applied to characterize the formed deposits on the test objects in order to validate hypothesized chemical pathways and their influencing factors. The majority of the presented work on the fundamental processes leading to deposit formation has been performed in the scope of the FVV-funded research projects “Alteration of fuel properties I-III”. Based on the findings, general recommendations are derived to control the formation of deposits. Considering marine engine conditions and typical fuel compositions these recommendations are specifically extended to marine applications.

【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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