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NO Reduction Mechanism Peculiar to O2/CO2 Coal Combustion Characterized by High CO2 Concentration

[+] Author Affiliations
Hirotatsu Watanabe, Takashi Marumo, Jun-ichiro Yamamoto, Ken Okazaki

Tokyo Institute of Technology, Tokyo, Japan

Paper No. AJTEC2011-44279, pp. T20026-T20026-6; 6 pages
doi:10.1115/AJTEC2011-44279
From:
  • ASME/JSME 2011 8th Thermal Engineering Joint Conference
  • ASME/JSME 2011 8th Thermal Engineering Joint Conference
  • Honolulu, Hawaii, USA, March 13–17, 2011
  • ISBN: 978-0-7918-3892-1 | eISBN: 978-0-7918-3894-5
  • Copyright © 2011 by ASME

abstract

The characteristics of NOx reduction in O2 /CO2 combustion were investigated experimentally and numerically. Experiments showed that the exhaust CO concentration in O2 /CO2 combustion was almost twice as much as that in air combustion. This was because high CO2 concentration enhanced the reaction (CO2 + H → CO + OH). A mass of OH radicals led to the oxidation of NH3 and HCN. The sum of the nitrogen-species in O2 /CO2 combustion was less than that in air combustion. It meant that NO formation suppression effect was high in O2 /CO2 combustion. N2 conversion ratio became an effective guide to show NO formation suppression effect quantitatively. Calculations showed that N2 conversion ratio was high in O2 /CO2 combustion and the unique NO reduction scheme caused by high CO2 concentration. This scheme proceeded under high CO and OH concentration. It was shown that O2 /CO2 combustion was suited for reducing nitrogen-oxide due to the unique NO reduction scheme.

Copyright © 2011 by ASME

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