SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (7): 787-799.DOI: 10.1016/S1004-9541(13)60539-X

• 能源、资源与环境技术 • 上一篇    下一篇

Diffusion Flame of a CH4/H2 Jet in a Hot Coflow: Effects of Coflow Oxygen and Temperature

梅振锋, 王飞飞, 李鹏飞, 米建春   

  1. State Key Laboratory of Turbulence & Complex Systems, Department of Energy & Resources Engineering, College of Engineering, Peking University, Beijing 100871, China
  • 收稿日期:2011-10-08 修回日期:2012-03-30 出版日期:2013-07-28 发布日期:2013-08-24
  • 通讯作者: MI Jianchun
  • 基金资助:

    Supported by the National Natural Science Foundation of China (51276002), and the Specific Research Fund for the Doctoral Program of Higher Education of China (20110001130014).

Diffusion Flame of a CH4/H2 Jet in a Hot Coflow: Effects of Coflow Oxygen and Temperature

MEI Zhenfeng, WANG Feifei, LI Pengfei, MI Jianchun   

  1. State Key Laboratory of Turbulence & Complex Systems, Department of Energy & Resources Engineering, College of Engineering, Peking University, Beijing 100871, China
  • Received:2011-10-08 Revised:2012-03-30 Online:2013-07-28 Published:2013-08-24
  • Supported by:

    Supported by the National Natural Science Foundation of China (51276002), and the Specific Research Fund for the Doctoral Program of Higher Education of China (20110001130014).

摘要: This paper investigates the effects of coflow O2 level and temperature on diffusion flame of a CH4/H2 jet in hot coflow (JHC) from a burner system similar to that of Dally et al. The coflow O2 mass fraction (yO2*) is varied from 3% to 80% and the temperature (Tcof*) from 1200 K to 1700 K. The Eddy Dissipation Concept (EDC) model with detailed reaction mechanisms GRI-Mech 3.0 is used for all simulations. To validate the modeling, several JHC flames are predicted under the experimental conditions of Dally et al. [Proc. Combust. Inst., 29 (1), 1147-1154 (2002)] and the results obtained match well with the measurements. Results demonstrate that, when yO2* decreased, the diffusion combustion is likely to transform from traditional combustion to MILD (Moderate or Intense Low-oxygen Dilution) combustion mode. When Tcof* is higher, the temperature distribution over the whole domain trends to be more uniform. Reducing yO2* or Tcof* leads to less production of intermediate species OH and CO. It is worth noting that if yO2* is high enough (yO2*>80%), increasing yO2* does not cause obvious temperature increase.

关键词: jet in hot coflow, moderate and intense low-oxygen dilution combustion, diffusion flame, intermediate specie

Abstract: This paper investigates the effects of coflow O2 level and temperature on diffusion flame of a CH4/H2 jet in hot coflow (JHC) from a burner system similar to that of Dally et al. The coflow O2 mass fraction (yO2*) is varied from 3% to 80% and the temperature (Tcof*) from 1200 K to 1700 K. The Eddy Dissipation Concept (EDC) model with detailed reaction mechanisms GRI-Mech 3.0 is used for all simulations. To validate the modeling, several JHC flames are predicted under the experimental conditions of Dally et al. [Proc. Combust. Inst., 29 (1), 1147-1154 (2002)] and the results obtained match well with the measurements. Results demonstrate that, when yO2* decreased, the diffusion combustion is likely to transform from traditional combustion to MILD (Moderate or Intense Low-oxygen Dilution) combustion mode. When Tcof* is higher, the temperature distribution over the whole domain trends to be more uniform. Reducing yO2* or Tcof* leads to less production of intermediate species OH and CO. It is worth noting that if yO2* is high enough (yO2*>80%), increasing yO2* does not cause obvious temperature increase.

Key words: jet in hot coflow, moderate and intense low-oxygen dilution combustion, diffusion flame, intermediate specie