Emission Characteristics of Turbulent Non-premixed CH4/NH3/air Swirl Flames through a Rich-Lean Gas Turbine-like Combustor at High Pressure

K. D.K.A. Somarathne, E. C. Okafor, A. Hayakawa, H. Kobayashi

Research output: Contribution to conferencePaperpeer-review

1 Citation (Scopus)

Abstract

In this study, NO emission characteristics of turbulent non-premixed CH4/NH3/air flames (energy fraction of NH3 (ENH3) of 20%) in a rich-lean gas turbine like combustor were numerically studied using a large eddy simulation technique and detailed chemistry, and compared with CH4/air (in which thermal NO is dominant) and NH3/air (in which Fuel NO is dominant) flames. The study found that NO production in CH4/NH3/air flames is primarily dependent on OH concentration, like NH3/air flames, which confirmed that the NO is mainly fuel origin. Consequently, the study found that low NO emission in the order of 200 ppm can be achieved using a rich-lean combustor at primary zone global equivalence ratio of 1.4 owing to low OH concentration. However in lean and stoichiometric conditions, NO emissions from CH4/NH3/air flames were two times higher than those of NH3/air flames and ten times higher than those of CH4/air flames due to high OH concentration. In addition, CH4/NH3 mixing enhances the burning characteristics of NH3, and even until global equivalence ratio of 1.4, unburnt NH3 not get into the secondary stage from the primary stage.

Original languageEnglish
Publication statusPublished - 2019 Jan 1
Event12th Asia-Pacific Conference on Combustion, ASPACC 2019 - Fukuoka, Japan
Duration: 2019 Jul 12019 Jul 5

Conference

Conference12th Asia-Pacific Conference on Combustion, ASPACC 2019
CountryJapan
CityFukuoka
Period19/7/119/7/5

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Condensed Matter Physics

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