Oxy-fuel combustion: Effect of recycled CO2 on pyrolysis behavior and char reactivity

Prabhat Naredi, Sarma V. Pisupati

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Oxy-fuel combustion is a promising technique to achieve significant reduction of CO2 emissions. However, due to change in the combustion medium from N2 (inert) to CO2 (reactive), significant changes in heat transfer, pollutant emissions and combustion behavior are expected. These changes have caused concerns for successful commercial application of this approach. In this paper, the effect of gas media on pyrolysis and combustion behavior is studied experimentally by conducting tests in a drop tube reactor, and numerically by computational fluid dynamics code FLUENT. Similar weight loss values were obtained when gas was switched from inert N2 to CO2 during the pyrolysis tests. To obtain the intrinsic char oxidation rate parameters three well known approaches were used: average reactivity up to certain burnoff range, reactivity at a fixed burn off and maximum reactivity. The reactivity parameters obtained using these approaches were then used to predict the char burnout at different furnace temperatures of a DTR using a FLUENT computational fluid dynamic code (CFD). The predicted results have suggested a significant effect of these rate parameters on the char burnout.

Original languageEnglish (US)
Title of host publication24th Annual International Pittsburgh Coal Conference 2007, PCC 2007
Number of pages10
StatePublished - Dec 1 2007
Event24th Annual International Pittsburgh Coal Conference 2007, PCC 2007 - Johannesburg, South Africa
Duration: Sep 10 2007Sep 14 2007


Other24th Annual International Pittsburgh Coal Conference 2007, PCC 2007
Country/TerritorySouth Africa

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology


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