Pyrometer Design for 2-Color Particle Temperatures Measurements in Large Flames

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Title Pyrometer Design for 2-Color Particle Temperatures Measurements in Large Flames
Creator Essenhigh, Robert H.; Obloza, James J.; Shaw, David W.
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1995
Spatial Coverage presented at Monterey, California
Abstract Design details are given of a 2-Color (intrusive) pyrometer used to measure particle temperatures at "point" locations in "large" coal-water fuel (CWF) flames. The results using this device, and comparative measurements in the same flames obtained by suction pyrometer, have already been reported [ I ] , but not the details of the 2-C pyrometer design; these are provided in this paper. Much of the design is conventional and has been reported previously [2]. What is unique is the design of the tip of the (intrusive) probe used to pick up the radiation signal. This is designed to define a "small" volume in the flame that is the source of the signal from the radiating particles. The basis of the probe design is a 6-nun quartz rod, to pick up the radiation signal, contained in a water-cooled jacket. The view half-angle from the rod into the flame is about 3°, thus defining the bounds of the view volume perpendicular to the view direction. The view depth into the flame is limited by a water-cooled target disc that is held in position by its water-cooling tubes. This distance was generally set at about 5 cm but is adjustable. At this time the device has been used in flames iii combustion chambers of dimensions 2'x2'xIO' . In the context of these dimensions, the viewing volume is considered "point-source". Details of the signal processing are given in the earlier paper [2]; the signal analysis is based on the treatment developed by Macek and Bulik [3]. The paper includes an outline both of the signal processing and analysis procedures, and a summary of earlier pertinent results. The result of principal interest is the difference of up to 400°C between the suction pyrometer and 2-C measurements, assumed to be representative of the ambient gas and reacting particles, respectively. The other aspect of interest discussed is the potential for scale up to boiler flames.
Type Text
Format application/pdf
Language eng
Rights This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee.
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Setname uu_afrc
ID 9514
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