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原文传递 Development of a Portable In-Use Reference PM Measurement System.

题名：	Development of a Portable In-Use Reference PM Measurement System.
作者：	K., Johnson; T., Durbin
关键词：	Diesel Sources; Emissions; Gravimetric Method; Heavy Duty Vehicles; Measurement Systems; Particulate Matter (pm) Emissions; Portable Emission Measurement System(pems); Reference Methods
摘要：	As particulate matter (PM) mass emissions continue to be reduced, there is increasing interest in the measurement of in-use PM mass with portable emissions measurement systems (PEMS). Unfortunately, the reliability of currently available PM PEMS is questionable, as comparisons to gravimetric reference methods have shown deviations often on the order of 100% and measurements are highly dependent on composition, particle size, and concentration. Real-time instruments are not necessarily faulty, rather their measurement principles do not correlate with the gravimetric method, and a combination of factors, such as size, shape, composition, and chemistry can contribute to a poor correlation. This report describes the development and evaluation of a high quality, multi-filter indexing gravimetric PM measurement system. The system is referred to as the PM PEMS (G) in this report. The PM PEMS (G) was designed for autonomous, all day in-use operation, for up to 30 gravimetric PM filter events in a single shift while following 40CFR Part 1066 and Part 1065 sampling specifications. The developed system was designed to quantify PM mass for in-use confirmatory testing on gasoline, alternative fuels, bio diesels, and diesel sources (on-highway, non-road, and marine) while utilizing the gravimetric reference method. The system was evaluated in a laboratory and on-road with a heavy duty vehicle equipped with an exhaust bypass system where PM concentration, composition, and size distribution was varied. This PM source test article was developed during previous evaluations of other PM PEMS for the U.S. Environmental Protection Agency Measurement Allowance program and was fully characterized for its impact on its chemical and physical PM attributes. The bypass tool was also critical in the summary of conclusions identifying the limitation of most PM PEMS systems. The comparison between the University of California at Riverside???s Mobile Emissions Laboratory (MEL) and the PM PEMS (G)
报告类型：	科技报告