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Soot Volume Fractions in Volatile Matter Envelope Flames of Bituminous Coal Particles in Air and Oxy-Fuel Combustion

[+] Author Affiliations
Reza Khatami, Yiannis A. Levendis

Northeastern University, Boston, MA

Paper No. POWER2013-98163, pp. V001T01A023; 5 pages
  • ASME 2013 Power Conference
  • Volume 1: Fuels and Combustion, Material Handling, Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines, Generators and Auxiliaries; Plant Operations and Maintenance
  • Boston, Massachusetts, USA, July 29–August 1, 2013
  • Conference Sponsors: Power Division
  • ISBN: 978-0-7918-5605-5
  • Copyright © 2013 by ASME


This work calculated volume fractions of soot in volatile matter envelope flames which form around burning single particles of bituminous coal. Both conventional combustion in air and simulated oxy-fuel combustion, with oxygen mole fractions in the range of 20–40% in CO2, were studied. Particles of 75–90 μm were injected in a bench-scale, transparent drop-tube furnace (DTF), at wall temperatures of 1400K. Upon ignition, optical pyrometry and high-speed photography were implemented to optically diagnose the burning particles. The method of Timothy et al[1] was applied to determine the instantaneous spatially-average soot volume fraction in these envelop flames. Results showed that soot shell forming around the particle was thicker and more luminous in air than the shell forming at the same O2 concentration in CO2. The soot volume fraction was decreased when N2 in air was replaced by CO2. Average soot volume fraction in the envelope flames in air was in the order of 7×10−5, whereas it was in the range 3.5×10−5 – 5.0×10−5 in oxy-fuel atmospheres.

Copyright © 2013 by ASME



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