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Development of an aerosol sampler for pressurized systems and its application to investigate the effect of residence time on PM1 formation in a 15 bar oxy-coal combustor by Dishant Khatri; Zhiwei Yang; Tainxiang Li; Richard L. Axelbaum is a Environmental Science article available to read on EtoBox.

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Many sophisticated instruments are available for obtaining detailed information about aerosol particle size, shape and composition, however, most of these devices require that the aerosol is at atmospheric pressure. At the same time, many important industrial processes involving aerosols operate at elevated pressure. Thus, a sampling system is needed that can reduce the pressure of a sample stream to atmospheric pressure without sample bias due to particle losses or generation. In this work, we present the design and testing of such a device, a pressurized particle sampler (PPS) for sampling pressurized aerosols. To obtain a representative sample, the PPS utilizes: 1) two-stage dilution to minimize particle generation in the sampling probe, 2) a pressurized PM10 cyclone to remove large particles, 3) a sonic nozzle connected to an axisymmetric expansion chamber to depressurize the aerosol sampling stream with minimum impaction losses on the walls, and 4) an isokinetic sampler after the expansion to extract the aerosol to the instrumentation at atmospheric pressure. The performance of the PPS is compared with that of a simple sonic nozzle, which has been used in several previous stud

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Author

Dishant Khatri; Zhiwei Yang; Tainxiang Li; Richard L. Axelbaum

Publisher

Informa UK Limited

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)