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

Bai, Xiaojing and Lu, Gang and Bennet, Tom and Sarroza, Archi and Eastwick, Carol and Liu, Hao and Yan, Yong (2017) 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, . pp. 322-330. ISSN 0894-1777. (doi:https://doi.org/10.1016/j.expthermflusci.2017.03.018) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided)

PDF - Publisher pdf

Creative Commons Licence
This work is licensed under a Creative Commons Attribution 4.0 International License.
Download (752kB) Preview
[img]
Preview
PDF - Author's Accepted Manuscript

Creative Commons Licence
This work is licensed under a Creative Commons Attribution 4.0 International License.
Download (702kB) Preview
[img]
Preview
MS Word - Author's Accepted Manuscript
Restricted to Repository staff only
Contact us about this Publication Download (1MB)
[img]
Official URL
https://doi.org/10.1016/j.expthermflusci.2017.03.0...

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 m), 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 m), 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.

Item Type: Article
Uncontrolled keywords: pulverized coal particles; drop tube furnace; high-speed imaging; image processing; combustion behaviors
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA166 Instrumentation
T Technology > TA Engineering (General). Civil engineering (General) > TA1520 Optical Engineering
T Technology > TA Engineering (General). Civil engineering (General) > TA1637 Image Analysis, Image Processing
T Technology > TA Engineering (General). Civil engineering (General) > TA 418.9 Materials of special composition or structure
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Depositing User: Gang Lu
Date Deposited: 13 Mar 2017 11:22 UTC
Last Modified: 25 May 2017 14:33 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/60872 (The current URI for this page, for reference purposes)
Yan, Yong: https://orcid.org/0000-0001-7135-5456
  • Depositors only (login required):

Downloads

Downloads per month over past year