Combustion behavior profiling of single pulverized coal particles in a drop tube furnace through high-speed imaging and image analysis

Bai, Xiaojing; Lu, Gang; Bennet, Tom D.; Sarroza, Archi C.; Eastwick, Carol; Liu, Hao; Yan, Yong

Abstract

Experimental investigations into the combustion behaviors of single pulverized coal particles are carried out based on high-speed imaging and image processing techniques. A high-speed video camera is employed to acquire the images of coal particles during their residence time in a visual drop tube furnace. Computer algorithms are developed to determine the characteristic parameters of the particles from the images extracted from the videos obtained. The parameters are used to quantify the combustion behaviors
of the burning particle in terms of its size, shape, surface roughness, rotation frequency and luminosity. Two sets of samples of the same coal with different particle sizes are studied using the techniques developed. Experimental results show that the coal with different particle sizes exhibits distinctly different combustion behaviors. In particular, for the large coal particle (150–212 lm), the combustion of volatiles and char takes place sequentially with clear fragmentation at the early stage of the char combustion.
For the small coal particle (106–150 lm), however, the combustion of volatiles and char occurs simultaneously
with no clear fragmentation. The size of the two burning particles shows a decreasing trend with
periodic variation attributed to the rapid rotations of the particles. The small particle rotates at a frequency
of around 30 Hz, in comparison to 20 Hz for the large particle due to a greater combustion rate.
The luminous intensity of the large particle shows two peaks, which is attributed to the sequential combustion
of volatiles and char. The luminous intensity of the small particle illustrates a monotonously decreasing trend, suggesting again a simultaneous devolatilization/volatile and char combustion.

Citation

Bai, X., Lu, G., Bennet, T. D., Sarroza, A. C., Eastwick, C., Liu, H., & Yan, Y. (in press). Combustion behavior profiling of single pulverized coal particles in a drop tube furnace through high-speed imaging and image analysis. Experimental Thermal and Fluid Science, 85, https://doi.org/10.1016/j.expthermflusci.2017.03.018

• Journal Article Type: Article
• Acceptance Date: Mar 12, 2017
• Online Publication Date: Mar 14, 2017
• Deposit Date: Mar 15, 2017
• Publicly Available Date: Mar 15, 2017
• Journal: Experimental Thermal and Fluid Science
• Print ISSN: 0894-1777
• Electronic ISSN: 0894-1777
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 85
• DOI: https://doi.org/10.1016/j.expthermflusci.2017.03.018
• Keywords: Pulverized coal particles, Drop tube furnace, High-speed imaging, Image processing, Combustion behaviors
• Public URL: https://nottingham-repository.worktribe.com/output/850591
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S089417771730081X
• Contract Date: Mar 15, 2017