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

doi:10.1016/S1004-9541(13)60539-X

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

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

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/Abstract

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 (y_O₂^*) is varied from 3% to 80% and the temperature (T_cof^*) 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 y_O₂^* decreased, the diffusion combustion is likely to transform from traditional combustion to MILD (Moderate or Intense Low-oxygen Dilution) combustion mode. When T_cof^* is higher, the temperature distribution over the whole domain trends to be more uniform. Reducing y_O₂^* or T_cof^* leads to less production of intermediate species OH and CO. It is worth noting that if y_O₂^* is high enough (y_O₂^*>80%), increasing y_O₂^* 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 (y_O₂^*) is varied from 3% to 80% and the temperature (T_cof^*) 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 y_O₂^* decreased, the diffusion combustion is likely to transform from traditional combustion to MILD (Moderate or Intense Low-oxygen Dilution) combustion mode. When T_cof^* is higher, the temperature distribution over the whole domain trends to be more uniform. Reducing y_O₂^* or T_cof^* leads to less production of intermediate species OH and CO. It is worth noting that if y_O₂^* is high enough (y_O₂^*>80%), increasing y_O₂^* does not cause obvious temperature increase.

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

梅振锋, 王飞飞, 李鹏飞, 米建春. Diffusion Flame of a CH₄/H₂ Jet in a Hot Coflow: Effects of Coflow Oxygen and Temperature[J]. Chinese Journal of Chemical Engineering, 2013, 21(7): 787-799.

MEI Zhenfeng, WANG Feifei, LI Pengfei, MI Jianchun . Diffusion Flame of a CH₄/H₂ Jet in a Hot Coflow: Effects of Coflow Oxygen and Temperature[J]. Chin.J.Chem.Eng., 2013, 21(7): 787-799.

参考文献

1 Li, P., Mi, J., Dally, B.B., Wang, F., Wang, L., Liu, Z., Chen, S., Zheng, C., “Progress and recent trend in MILD Combustion”, Sci. China Tech. Sci., 54 (2), 255-269 (2011).

2 Katsuki, M., Hasegawa, T., “The science and technology of combustion in highly preheated air”, Proc. Combust. Inst., 27 (2), 3135-3146 (1998).

3 Cavaliere, A., De, Joannon, M., “Mild combustion”, Prog. Energ. Combust., 30 (4), 329-366 (2004).

4 De Joannon, M., Langella, G., Beretta, F., Cavliere, A., Noviello, C., “Mild combustion: Process features and technological constrains”, Combust. Sci. Technol., 153 (1), 33-50 (2000).

5 Tsuji, H., Gupta, A., Hasegawa, T., Katsuki, M., Kishimoto, K., Morita, M., High Temperature Air Combustion: From Energy Conservation to Pollution Reduction, CRC Press, Florida (2003).

6 Szegö, G.G., Dally, B.B., Nathan, G.J., “Operational characteristics of a parallel jet MILD combustion burner system”, Combust. Flame, 156 (2), 429-438 (2009).

7 Mi, J., Li, P., Dally, B.B., Craig, R.A., Wang, F., “Importance of initial momentum rate and air-fuel premixing on moderate or intense low oxygen dilution (MILD) combustion in a recuperative furnace”, Energy Fuels, 23 (11), 5349-5356 (2009).

8 Mi, J., Li, P., Zheng, C., “Numerical simulations of flameless premixed combustion in a recuperative furnace”, Chin. J. Chem. Eng., 18 (1), 10-17 (2010).

9 Li, Y., Qi, H., Yuan, J., “Numerical Analysis of high temperature combustion of methane”, Journal of Engineering Thermophysics, 22 (2), 257-260 (2001). (in Chinese)

10 Li, P., Mi, J., Dally, B.B., Craig, R.A., Wang, F., “Premixed moderate or intense low-oxygen dilution (MILD) combustion from a single jet burner in a laboratory-scale furnace”, Energy Fuels, 25 (7), 2782-2793 (2011).

11 Li, P., Mi, J., Wang, F., “Effect of equivalence ratio and reactants mixing pattern on flameless combustion”, Proc. CSEE, 31 (5), 20-27 (2011). (in Chinese)

12 Li, P., Dally, B.B., Mi, J., Wang, F., “MILD oxy-combustion of gaseous fuels in a laboratory-scale furnace”, Combust. Flame, 160 (5), 933-946 (2013).

13 Mi, J., Li, P., Zheng, C., “Impact of injection conditions on flame characteristics from a parallel multi-jet burner”, Energy, 36 (11), 6583-6595 (2011).

14 Mi, J., Wang, F., Li, P., Dally, B.B., “Modified vitiation by operational parameters in a MILD combustion furnace”, Energy Fuels, 26 (1), 265-277 (2012).

15 Dally, B.B., Karpetis, A.N., Barlow, R.S., “Structure of turbulent non-premixed jet flames in a diluted hot coflow”, Proc. Combust. Inst., 29 (1), 1147-1154 (2002).

16 Christo, F.C., Dally, B.B., “Modeling turbulent reacting jets issuing into a hot and diluted coflow”, Combust. Flame, 142, 117-129 (2005).

17 Mardani, A., Tabejamaat, S., Ghamari, M., “Numerical study of influence of molecular diffusion in the MILD combustion regime”, Combust. Theor. Model., 14, 747-774 (2010).

18 Chui, E.H., Raithby, G.D., “Computation of radiant heat transfer on a nonorthogonal mesh using the finite-volume method”, Numer. Heat Transfer B Fund., 23, 269-288 (1993).

19 Magnussen, B.F., Hjertager, B.H., “On mathematical modeling of turbulent combustion with special emphasis on soot formation and combustion”, Symp. (Int.) Combust., 16 (1), 719-729 (1977).

20 Smith, G.P., Golden, D.M., Frenklach, M., Moriarty, N.W., Eiteneer, B., Goldenberg, M., Bownan, C.T., Hanson, R.K., Song, S., Gardiner, W.C, Lissianski, Jr.V.V., Qin, Z., “GRI-Mech 3.0”, http://www.me.berkeley.edu/gri_mech/.

21 Lauder, B.E., Spalding, D.B., Lectures in Mathematical Models of Turbulence, Academic Press, London (1972).

22 Galletti, C., Parente, A., Derudi, M., Rota, R., Tognotti, G., “Numerical and experimental analysis of NO emissions from a lab-scale burner fed with hydrogen-enriched fuels and operating in MILD combustion”, Int. J. Hydrogen Energy, 34 (19), 8339-8351 (2009).

23 Parente, A., Galletti, C., Tognotti, L., “Effect of the combustion model and kinetic mechanism on the MILD combustion in an industrial burner fed with hydrogen enriched fuels”, Intl. J. Hydrogen Energy, 33 (24), 7553-7564 (2008).

24 Pope, S.B., “Computationally efficient implementation of combustion chemistry using in situ adaptive tabulation”, Combust. Theor. Model, 1, 41-63 (1997).

25 Bilger, R.W., Starner, S.H., Kee, R.J., “On reduced mechanisms for methane-air combustion in nonpremixed ?ames”, Combust. Flame, 80, 135-149 (1990).

26 Bombach, R., Käppeli, B., “Simultaneous visualisation of transient species in ?ames by planar-laser-induced ?uorescence using a single laser system”, Appl. Phys. B., 68 (2), 251-255 (1999).

27 Medwel, P.R., “Laser diagnostics in MILD combustion”, Ph.D. Thesis, University of Adelaide, Australia (2007).

28 Gardiner, J.W.C., Combustion Chemistry, Springer-Verlag, New York (1984).

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

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

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 0

编辑推荐

Metrics

本文评价