Effects of particle size distribution and oxygen concentration on the propagation behavior of pulverized coal flames in O2/CO2 atmospheres

Download
  1. Available on March 30, 2018
  2. Get@NRC: Effects of particle size distribution and oxygen concentration on the propagation behavior of pulverized coal flames in O2/CO2 atmospheres (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1021/acs.energyfuels.6b03248
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleEnergy & Fuels
ISSN0887-0624
1520-5029
Volume31
Issue5
Pages55715580
AbstractThe ignition and flame propagation behavior of pulverized coal particles in an O2/CO2 atmosphere was studied in a long quartz tube reactor. The effects of mixing ratio of fine (mean diameter 16 μm) and coarse (mean diameter 82 μm) coal particles and oxygen concentration on the ignition characteristics, flame front distance, and flame propagation velocity were investigated by capturing the flame ignition and propagation using a high-speed video camera. The experimental results show that the particle size distribution has a strong influence on the ignition and flame structure of coal particles. Smaller coal particles result in earlier ignition, a smoother flame front, longer flame, and faster flame propagation velocity. Mixing of smaller coal particles with larger ones shortens the ignition delay and enhances the propagation velocity of the flame front. For different coal particle size distributions, the variation of flame propagation velocity with time in general displays an “M”-shaped curve. The curve of flame propagation velocity vs time is single-peaked at 40% oxygen concentration for both coarse and fine particles with mean diameters of 82 and 16 μm, respectively. The effect of oxygen concentration on the flame propagation becomes stronger as the percentage of fine particles increases. The effect of fine coal particles on the volatile release rate of coarse particles was analyzed by numerical simulation. The results show that increasing the ratio of fine coal particles shortens the time for volatile matter release from the coarse coal particles and increases the coarse particle temperature.
Publication date
PublisherAmerican Chemical Society
LanguageEnglish
AffiliationMeasurement Science and Standards; National Research Council Canada
Peer reviewedYes
NPARC number23002361
Export citationExport as RIS
Report a correctionReport a correction
Record identifier745ac6c4-70a1-4989-b14f-b250b78eb584
Record created2017-10-23
Record modified2017-10-23
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)