Simulation of a syngas counter-flow diffusion flame structure and NO emissions in the pressure range 1-10 atm
FUEL PROCESSING TECHNOLOGY, cilt.123, ss.149-158, 2014 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 123
- Basım Tarihi: 2014
- Doi Numarası: 10.1016/j.fuproc.2013.10.019
- Dergi Adı: FUEL PROCESSING TECHNOLOGY
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.149-158
- Orta Doğu Teknik Üniversitesi Adresli: Hayır
Özet
This paper reports a numerical investigation of syngas flame structure and NO reaction pathways over a wide range of operating conditions (H-2/CO ratio between 0.4 and 2.4, scalar dissipation rate from equilibrium to extinction and ambient pressure from 1 to 10 atm) in mixture fraction space. An analysis of optimal operation conditions for syngas combustion in regard to NO index emissions is also provided. Flame structure is characterized by solving flamelet equations with the consideration of radiation. The chemical reaction mechanism adopted is GRI-Mech 3.0. The computational predictions showed that flame temperature exhibits a peak at an intermediate scalar dissipation rate for a given value of H-2/CO ratio. From hydrogen-lean syngas to hydrogen-rich syngas fuels, maximum flame temperature increases for scalar dissipation rate values lower than the intermediate value whereas decreases at higher values. Zeldovich route is found to be the main NO formation route and its contribution to the NO production continually increases with the increase of hydrogen content and pressure. Hydrogen-rich syngas flames produce more NO at lower scalar dissipation rates while NO levels increase towards hydrogen-lean syngas flames at higher scalar dissipation rates. (C) 2013 Elsevier B.V. All rights reserved.