Comprehensive Data Set of Single Particle Combustion under Oxy-fuel Conditions, Part I: Measurement Technique. Issue 14 (26th October 2021)

• Record Type: Journal Article
• Authors: Vorobiev, Nikita; Valentiner, Sarah; Schiemann, Martin; Scherer, Viktor
• Is Part Of: Combustion science and technology. Volume 193:Issue 14(2021)
• Page Start: 2423
• Page End: 2444
• Publication Date: 2021-10-26
• Subjects: Optical measurement -- single particle -- particle shape -- biomass -- coal; Combustion -- Periodicals; Combustion engineering -- Periodicals; 541.36105
• DOI: 10.1080/00102202.2020.1743696
• Languages: English
• ISSNs: 0010-2202

Abstract

ABSTRACT: 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.