Comprehensive Data Set of Single Particle Combustion under Oxy-fuel Conditions, Part I: Measurement Technique

An improved experimental methodology is presented that provides combustion data of single pulverized coal and biomass particles with a high level of detail. This is the first part of a two-article series. A stereoscopic imaging system based on four intensified CCD-cameras is calibrated for in-situ m...

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Bibliographic Details
Published in:Combustion science and technology 2021-10, Vol.193 (14), p.2423-2444
Main Authors: Vorobiev, Nikita, Valentiner, Sarah, Schiemann, Martin, Scherer, Viktor
Format: Article
Language:English
Subjects:
Aspect ratio
biomass
Biomass burning
Burnout
Cameras
coal
Combustion
Datasets
Diameters
Image reconstruction
Laminar flow
Measurement methods
Measurement techniques
Nuclear fuels
Optical measurement
Oxy-fuel
particle shape
Pulverized coal
Pyrometry
single particle
Solid fuels
Suction
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Summary:An improved experimental methodology is presented that provides combustion data of single pulverized coal and biomass particles with a high level of detail. This is the first part of a two-article series. A stereoscopic imaging system based on four intensified CCD-cameras is calibrated for in-situ measurements of temperature, size, shape, and velocity of solid fuel particles in the diameter range of 30-300 µm. An elaborate approach for 3D shape reconstruction from orthogonal projections of single particles shows significantly improved accuracy, which is validated against particle samples being collected with a suction probe. The close-meshed combination of imaging pyrometry and shadowgraphy is a further novelty. The parallel application of both techniques provides results for both self-luminous "hot" (imaging pyrometry) and "cold" (shadowgraphy) particles. This enhances information on particle ignition (particles switch from cold to hot) and duration of char burn-out (particles switch from hot to cold). Selected experimental results are presented which demonstrate the informative power of data sets formed by this approach. Torrefied miscanthus is burned in a laminar flow reactor. The particle size and aspect ratio are evaluated for the in-situ measuring method as well as for the collected samples. The results show a good correlation between both analysis routines, indicating the progress in solid fuel characterization by the improved optical technique in combination with particle sampling.
ISSN:0010-2202
1563-521X
DOI:10.1080/00102202.2020.1743696