【作者】

Toomas Karhu

【摘要】

该论文已在芬兰赫尔辛基举行的第28届CIMAC大会上发表。论文的版权归CIMAC所有。In this experimental engine study, the effects of renewable paraffinic NEXBTL diesel on engine performance were researched by Turku University of Applied Sciences Engine laboratory in co-operation with Neste Corporation. The target was to determine if it would be possible to reduce the fuel consumption of the engine with two research fuels by optimizing fuel injection parameters and the use of exhaust gas recirculation, while maintaining nitrous oxide emission levels achieved with diesel. In the first part of the study fuel injection parameters were optimized separately to determine the effects of each change with research fuels. The two used research fuels were neat NEXBTL and a 50-50 blend of fossil summer grade diesel and NEXBTL. A fossil summer grade diesel was used as a reference fuel. The greatest advantages for the two research fuels in comparison to diesel were seen in significantly lower smoke numbers. Fuel injection parameter optimization did not produce significant reduction in fuel consumption, as the base results of NOX were quite similar with all fuels, which made optimization possibilities quite narrow. The use of EGR reduced the NOX significantly but simultaneously the amount of smoke rose. When NOX was brought back to the reference levels by optimizing the fuel injection parameters, notable gains in fuel consumption were noticed. At the same time the smoke numbers were clearly higher than the reference level. No significant constant differences between the three fuels were seen in in-cylinder results. At some lower load points shorter ignition delay of NEXBTL was measured. The NOX-results of transient cycle were quite close to each other when using different fuels. Only slight changes in fuel consumption were noticed in these runs. Two different rates of EGR-settings were used, and in addition fuel injection parameters were optimized with lower EGR-valve settings to bring NOX to the reference level. In the last part of the study a transient cycle was used to compare the fuels. Gaseous emissions, temperatures and pressures were collected with an engine controlling program. The engine used in this study was a 4-cylinder AGCO Power off-road diesel engine. Also, an in-cylinderdata was collected and analyzed via a cylinder pressure sensor and engine indicating system. The main target was to compare the results of cylinder pressures, heat release rates and ignition delays between different fuels

【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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