【作者】

Mathias Fiedler，Hugo Fiedler

【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 objective of the paper is to present experimental results gained from a long-stroke medium speed diesel engine. The study is carried out on the 3-cylinder long-stroke FMC 4524 research engine located at Flensburg University of Applied Sciences in cooperation with ABB Turbo Systems, Baden. Based on a IMO ll Layout of the engine featuring • High stroke/bore ratio of s/d=450mm/240mm=1,875, • optimized mechanical efficiency based on crankshaft design acc. to classification rules, • combustion chamber design optimized for high compression ratio(=17.8), • 2 stage High Pressure Injection System with variable injection pressure, • Single Stage Turbo Charging,· and standard Inlet Valve Timing, Two Stage Turbo Charging and Miller Cycle Inlet Valve Timing were applied in several steps. In parallel modifications to the exhaust gas system were applied to improve part load and startup performance. Also variations of exhaust gas valve timing and injection characteristics were executed. The project is primarily aimed at reduction of CO2-and PM-Emissions in the envelope of IMO lll exhaust gas regulations for non ECAs. In an intermediate development step Inlet Valve Timing was moved to 42℃A before BDC(Miller42) and 50℃A before BDC (Miller 50). The first results of Miller 42 showed a reduction of fuel consumption to 168 g/kWh, meaning a CO2-Emission reduction of app.6% based on the values of the base engine. PM-Emissions stayed constant on the low level of the base engine. In opposition to the expected trend Nitric Oxide Emissions could be reduced by 20% down to about8g/kWh. Further development steps will include tests with more extreme Miller-Configurations up 60℃A before BDC. Additionally, pilot-application of other means for emission control like EGR and Fuel-Water emulsion are planned to evaluate further emission reduction potential aiming at emission regulations for ECAs.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

7

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