Characteristics of NOx emission with flue gas dilution in air and fuel sides

Eun Seong Cho, Suk Ho Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Flue gas recirculation (FGR) is a method widely adopted to control NO x in combustion system. The recirculated flue gas decreases flame temperature and reaction rate, resulting in the decrease in thermal NO production. Recently, it has been demonstrated that the recirculated flue gas in fuel stream, that is, the fuel induced recirculation (FIR), could enhance a much improved reduction in NOx per unit mass of recirculated gas, as compared to the conventional FGR in air. In the present study, the effect of FGR/FIR methods on NOx reduction in turbulent swirl flames by using N2 and CO2 as diluent gases to simulate flue gases. Results show that CO2 dilution is more effective in NO reduction because of large temperature drop due to the larger specific heat of CO 2 compared to N2 and FIR is more effective to reduce NO emission than FOR when the same recirculation ratio of dilution gas is used.

Original languageEnglish (US)
Pages (from-to)2303-2309
Number of pages7
JournalKSME International Journal
Issue number12
StatePublished - Dec 2004
Externally publishedYes


  • Flue Gas Recirculation (FGR)
  • Fuel Induced Recirculation (FIR)
  • Nitric Oxides

ASJC Scopus subject areas

  • Mechanical Engineering


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