【作者】

Dave Jay

【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 Development of CR Technology In the last Decade – 4 Stroke Wartsila Engines. Mr. David Jay Mr. Arto Järvi Mr. Stefan Saario Mr. Diego Delneri Mr. Franco Cavressi The emissions regulations continue to tighten, from the 1st January 2015 ship owners needed to comply with options for the SECA (Sulphur Emission Control Areas). New IMO Tier 3 emission regulations are expected in 2016 in the ECA regions (North America & Canada). This new regulation requires NOx conformity at 4-5 selected load points on relevant emission cycles. With some coastal authorities imposing fines for visual smoke emissions this has driven engine fuel injection system designs into having more flexibility, greater fuel flexibility and additional extra effort in the lower load engine operation modes. In mid-2015, Wartsila has achieved over 3 Million hours from 14 cruise ships, 890 cylinders, operating with the W46 engines running first generation CR. This has been the basis and foundation for the reliability of the next CR generation equipment, called CR2. In detail, the paper describes how features of the CR1 equipment were developed, and validated, and later introduced for the CR2. System lifecycle cost experiences comparisons are presented for Wartsila W32 and W46 engines based on operator experiences. Performance has also advanced significantly in the last decade. The W20 engine has been used to pioneer the field testing on CR2 , multi-element pump systems, but the engine performance has progressed with a new 2200 bar concept injector design suitable with EGR, to reach the IMO Tier 3 regulations with a pure primary engine build. The new W31 engine has been an opportunity to design an engine purely for the future Common rail. This has enabled a smaller footprint, advanced valve train packaging, and compact engine block outline, with a smaller camshaft and drive train, due to the lower peak torques that are inherent of a high pressure jerk pump system. The merits of having a diesel engine version CR twin nozzle ,with a low load nozzle tuned for low load performance, with emphasis on smoke and emissions, and a high load nozzle optimised for full load efficiency has proven to be a performance pace-setter. The paper will also describe the functionality of the W31 DF Fuel injection equipment. The W31 fuel injection has a ‘one system fits all’ strategy, meaning the Dual fuel engine system also has a twin nozzle, with in this case the small nozzle optimised for the pilot fuel, to support gas ignition. The ‘one system fits all’ enables greater fuel flexibility, reliability, easy conversion and simpler external plants. Since many of the features in the W31 engine FIE have a field tested history, it is possible to finalise on the predicted lifecycle and cost of ownership of the new W31 injection equipment. It has been an exciting decade.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

4

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