【作者】

Juha Heikkilä

【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。”To measure is to know” says an old quote presumably from Lord Kelvin. This holds true more than ever also for exhaust gas emissions – we must measure to gain knowledge. There is an ever increasing demand to measure. The scope and range of the measured emission components are wide and expanding: stricter emission legislation, fuel flexibility, aftertreatment systems, customers’ needs, etc. This paper concentrates on two areas: particulate measurements and special gaseous emission measurements. The focus is on medium-speed diesel and gas engines used for power generation in power plants or in marine applications. Emission limits can vary depending on application, location, engine size, and power output. The emission level for a specific engine depends, for example, on the fuel type and quality. This means that one must be able to measure a wide variety of different emission components over a wide range – both gaseous and particulate. In the first part of this paper, particle emissions from engines operated with different fuels and fuel qualities are studied, using novel particle analysers (e.g. Dekati ELPI+ and AVL Micro Soot Sensor). One interesting result is that Black Carbon (BC) exhaust concentration is on the same level when running on LFO as on HFO fuels. When running on gas, the BC level drops by over 90%. Traditional gravimetric particle measurement method (ISO 8178&9096) results are incorporated into the study. The second part presents how sophisticated gas emission analysers are used in engine development, allowing more detailed and faster testing compared to traditional methods. Results on fast measurement of NOx and THC are presented as well. This method is used in the study to optimise combustion quality, leading to lower emissions. Based on findings presented in this paper, future prospects regarding requirements and needs for emission measurements are discussed. Lower emissions are harder to measure, pushing the performance limits of the current measurement methods and equipment. On the other hand, more advanced measurement equipment enable a more versatile use of the equipment. Novel particle and gas analysers are not just emission measurement devices but an important part of the engine development process.

【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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