Measurement of transmissivity in outdoor soot plumes using sky-scattered solar radiation

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ConferenceCombustion Institute Canadian Section, 2008 Spring Technical Meeting, May 11-14, Toronto, ON
AbstractCurrently there is a lack of practical approaches for quantifying soot emission rates from unconfined industrial sources such as stack plumes and flares. Most regulatory standards are based on a human-observed opacity standard as outlined in U.S. Environmental Protection Agency Method 9. This paper is the third part of an investigation of a sky-scattered solar radiation based optical diagnostic for plume transmissivity measurement. The technique is based on the established laboratory optical technique known as diffuse Two Dimensional Line-of-sight attenuation (2D-LOSA), in which images of a light source, the light source through a plume, and plume alone are compared in a so-called “3-image” algorithm. However, when the technique is transferred to an outdoor setting where the light source is sky-scattered solar radiation, a “1-image” algorithm must be used, in which the unattenuated light in the plume region must be interpolated from other regions of the image. A detailed explanation of 2D-LOSA 3-image vs. 1-image routines for lab and outdoor measurements can be found in previous papers. This paper is focused on 1) background interpolation analysis under different sky conditions to determine unattenuated intensities behind the plume; 2) comparison of measurements of soot in an unconfined plume using both lab-based and sky-LOSA techniques; and 3) determination of the ultimate accuracy and sensitivity limits in terms of soot emission rate for the sky-LOSA technique.
Publication date
AffiliationNRC Institute for Chemical Process and Environmental Technology; National Research Council Canada (NRC-CNRC)
Peer reviewedNo
NRC number51593
NPARC number8900899
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Record identifierd63d1a5f-46e3-4aca-8859-66e7331f24be
Record created2009-10-03
Record modified2016-05-09
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