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Development and Performance Evaluation of a Porous Tube Dilutor for Real-time Measurements of Fine Particles in High-humidity Environments

Category: Aerosol Physics and Instrumentation

Article In Press
DOI: 10.4209/aaqr.2018.08.0319

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Chang Gyu Woo1, Ki-Jung Hong1, Hak-Joon Kim1, Yong-Jin Kim1, Bangwoo Han 1, Jeongeun An2, Su Ji Kang3, Sung-Nam Chun3

  • 1 Department of Environmental Machinery, Korea Institute of Machinery & Materials, Daejeon 34103, Korea
  • 2 Parkor Korea Indus Co., Ltd., Seoul 08584, Korea
  • 3 Clean Power Generation Laboratory, KEPCO Research Institute, Daejeon 34056, Korea


For measuring fine particles in the exhaust gas, porous tube dilutor was developed.
Through dilution in the sampling process, condensable particles were excluded.
Particles larger than 3 µm in diameter were successfully measured.
The dilutor can be used to continuous real-time monitoring PM10 and PM2.5.


Real-time measurement of fine particles in stack emission gases is an important component in continuous environmental monitoring of PM10 and PM2.5. We developed a porous tube dilutor (using both hot and cold dilution) to measure fine, but not condensable, particles in highly humid gas emissions and compared our device to a commercial ejector-type dilutor. Particle size distributions were measured in emissions from a diesel engine and a coal-fired boiler. The porous tube dilutor successfully measured particles in accumulation mode, including relatively large particles over 3 µm in diameter (without nuclei), whereas the ejector dilutor detected some condensable particles but could not detect large particles. The porous tube dilutor successfully removed condensed water droplets generated by a humidifier in a 30-m3 chamber.


Sampling PM10 PM2.5 Dilution Condensable

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