Numerical study of the effect of wall thermal conditions and oxidant structure on the flame structure and combustion regime in non-premixed combustion furnace

Document Type : Original Article

Authors

1 Department of Mechanical Engineering, Kashan University, Isfehan, Iran

2 دانشجوی دکترا دانشگاه تربیت مدرس

Abstract

The aim of this study is to investigate the effect of wall thermal conditions and oxidant composition on the flame structure and map of combustion regimes. For this purpose, non-premixed combustion furnace of the Lisbon University has been investigated using the open source OpenFoam software as well as chemical calculations with the help of counter-flow diffusion flame solver. In numerical study, standard k-ε turbulence model, modified EDC combustion model, and discrete phase radiation model with the calculation of absorption and emission coefficients at six different wavelengths have been used. The results of simulations and kinetic calculations show that the change in oxidant composition and wall thermal conditions leads to changes in reaction pathways. Replacement of CO2 with N2 in the oxidant and presence of heat losses lead to fundamental changes in flame structure. The presence of wall heat loss, especially in conventional and flameless combustion regimes, leads to fundamental changes in the reaction pathways and alters flame structure, while the main contribution to the changes of flame structure is different physical and chemical properties of CO2 in comparison with N2 at conventional and flameless regimes, respectively. In the high temperature combustion regime, the contributions of physical and chemical effects are almost equal.
 
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Keywords

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References

  1. R.-H. Chen, “NOx and NO2 Emission of Swirl-Stabilized Nonpremixed Flames of a H2—CH4 Mixture,” Combustion science and technology, 120, 1996, pp. 321-333.
  2. R. Kurose, H. Makino, A. Suzuki, “Numerical analysis of pulverized coal combustion characteristics using advanced low-NOx burner,” Fuel, 83, 2004, pp. 693-703.
  3. E. Ebrahimi Fordoei, K. Mazaheri, “Effects of preheating temperature and dilution level of oxidizer, fuel composition and strain rate on NO emission characteristics in the syngas moderate or intense low oxygen dilution (MILD) combustion,” Fuel, 285, 2021, pp. 119118.
  4. M. B. Toftegaard, J. Brix, P. A. Jensen, P. Glarborg, A. D. Jensen, “Oxy-fuel combustion of solid fuels,” Progress in energy and combustion science, 36, 2010, pp. 581-625.
  5. J. Wünning, J. Wünning, “Flameless oxidation to reduce thermal NO-formation,” Progress in energy and combustion science, 23, 1997, pp. 81-94.
  6. A. Cavaliere, M. De Joannon, “Mild combustion,” Progress in Energy and Combustion science, 30, 2004, pp. 329-366.
  7. M. De Joannon, A. Matarazzo, P. Sabia, A. Cavaliere, “Mild combustion in homogeneous charge diffusion ignition (HCDI) regime,” Proceedings of the Combustion Institute, 31, 2007, pp. 3409-3416.
  8. M. De Joannon, P. Sabia, G. Sorrentino, A. Cavaliere, “Numerical study of mild combustion in hot diluted diffusion ignition (HDDI) regime,” Proceedings of the Combustion Institute, 32, 2009, pp. 3147-3154.
  9. M. De Joannon, G. Sorrentino, A. Cavaliere, “MILD combustion in diffusion-controlled regimes of hot diluted fuel,” Combustion and Flame, 159, 2012, pp. 1832-1839.
  10. C. Luan, S. Xu, B. Shi, Y. Tu, H. Liu, P. Li, Z. Liu, “Re-Recognition of the MILD Combustion Regime by Initial Conditions of T in and X O2 for Methane in a Nonadiabatic Well-Stirred Reactor,” Energy & Fuels, 34, 2020, pp. 2391-2404.
  11. F. Tabet, B. Sarh, I. Gökalp, “Hydrogen–hydrocarbon turbulent non-premixed flame structure,” International journal of hydrogen energy, 34, 2009, pp. 5040-5047.
  12. N. a. K. Doan, N. Swaminathan, “Autoignition and flame propagation in non-premixed MILD combustion,” Combustion and Flame, 201, 2019, pp. 234-243.
  13. T. Jaravel, E. Riber, B. Cuenot, P. Pepiot, “Prediction of flame structure and pollutant formation of Sandia flame D using Large Eddy Simulation with direct integration of chemical kinetics,” Combustion and Flame, 188, 2018, pp. 180-198.
  14. D. Butz, S. Hartl, S. Popp, S. Walther, R. S. Barlow, C. Hasse, A. Dreizler, D. Geyer, “Local flame structure analysis in turbulent CH4/air flames with multi-regime characteristics,” Combustion and Flame, 210, 2019, pp. 426-438.
  15. A. E. Lutz, R. J. Kee, J. F. Grcar, F. M. Rupley, “OPPDIF: A Fortran program for computing opposed-flow diffusion flames,” Sandia National Labs., Livermore, CA (United States), 1997.
  16. Y. Tu, M. Xu, D. Zhou, Q. Wang, W. Yang, H. Liu, “CFD and kinetic modelling study of methane MILD combustion in O2/N2, O2/CO2 and O2/H2O atmospheres,” Applied energy, 240, 2019, pp. 1003-1013.
  17. S. Chen, J. Mi, H. Liu, C. Zheng, “First and second thermodynamic-law analyses of hydrogen-air counter-flow diffusion combustion in various combustion modes,” International journal of hydrogen energy, 37, 2012, pp. 5234-5245.
  18. G. B. Ariemma, P. Bozza, M. De Joannon, P. Sabia, G. Sorrentino, R. Ragucci, “Alcohols as Energy Carriers in MILD Combustion,” Energy & Fuels, 35, 2021, pp. 7253-7264.
  19. A. Rebola, M. Costa, P. J. Coelho, “Experimental evaluation of the performance of a flameless combustor,” Applied thermal engineering, 50, 2013, pp. 805-815.
  20. A. Rebola, P. Coelho, M. Costa, “Assessment of the performance of several turbulence and combustion models in the numerical simulation of a flameless combustor,” Combustion Science and Technology, 185, 2013, pp. 600-626.
  21. E. Ebrahimi Fordoei, K. Mazaheri, A. Mohammadpour, “Numerical study on the heat transfer characteristics, flame structure, and pollutants emission in the MILD methane-air, oxygen-enriched and oxy-methane combustion,” Energy, 218, 2021, pp. 119524.
  22. G. P. Smith, D. M. Golden, M. Frenklach, N. W. Moriarty, B. Eiteneer, M. Goldenberg, C. T. Bowman, R. K. Hanson, S. Song, W. C. Gardiner Jr, “GRI 3.0 Mechanism,” Gas Research Institute (http://www.me.berkeley.edu/gri_mech), 1999,
  23. M. H. Moghadasi, R. Riazi, S. Tabejamaat, A. Mardani, “Effects of preheating and CO2 dilution on oxy-MILD combustion of natural gas,” Journal of Energy Resources Technology, 141, 2019, pp. 1-12,
  24. E. Ebrahimi Fordoei, K. Mazaheri, “Numerical study of the effect of carbon dioxide injection on flame structure in flameless combustion regime,” Fuel and Combustion, 13, 2020, pp. 1-26.
  25. K.-P. Cheong, P. Li, F. Wang, J. Mi, “Emissions of NO and CO from counterflow combustion of CH4 under MILD and oxyfuel conditions,” Energy, 124, 2017, pp. 652-664.
  26. Y. He, C. Zou, Y. Song, Y. Liu, C. Zheng, “Numerical study of characteristics on NO formation in methane MILD combustion with simultaneously hot and diluted oxidant and fuel (HDO/HDF),” Energy, 112, 2016, pp. 1024-1035.
  27. P. Sabia, M. De Joannon, A. Picarelli, A. Chinnici, R. Ragucci, “Modeling Negative Temperature Coefficient region in methane oxidation,” Fuel, 91, 2012, pp. 238-245.
  28. P. Sabia, G. Sorrentino, A. Chinnici, A. Cavaliere, R. Ragucci, “Dynamic behaviors in methane MILD and oxy-fuel combustion. Chemical effect of CO2 ,” Energy & Fuels, 29, 2015, pp. 1978-1986.
  29. E. Abtahizadeh, A. Sepman, F. Hernández-Pérez, J. Van Oijen, A. Mokhov, P. De Goey, H. Levinsky, “Numerical and experimental investigations on the influence of preheating and dilution on transition of laminar coflow diffusion flames to Mild combustion regime,” Combustion and flame, 160, 2013, pp. 2359-2374.
  30. N. Kim, Y. Kim, M. N. M. Jaafar, M. R. Rahim, M. Said, “Effects of hydrogen addition on structure and NO formation of highly CO-Rich syngas counterflow nonpremixed flames under MILD combustion regime,” International Journal of Hydrogen Energy, 46, 2021, pp. 10518-10534.
  31. J. Park, S. G. Kim, K. M. Lee, T. K. Kim, “Chemical effect of diluents on flame structure and NO emission characteristic in methane‐air counterflow diffusion flame,” International Journal of Energy Research, 26, 2002, pp. 1141-1160.
  32. K.-P. Cheong, G. Wang, J. Si, J. Mi, “Nonpremixed MILD combustion in a laboratory-scale cylindrical furnace: Occurrence and identification,” Energy, 216, 2021, pp. 119295.
  33. Z. Cheng, J. A. Wehrmeyer, R. W. Pitz, “Experimental and numerical studies of opposed jet oxygen-enhanced methane diffusion flames,” Combustion science and technology, 178, 2006, pp. 2145-2163.
  34. K. Safer, F. Tabet, A. Ouadha, M. Safer, I. Gökalp, “Combustion characteristics of hydrogen-rich alternative fuels in counter-flow diffusion flame configuration,” Energy conversion and management, 74, 2013, pp. 269-278.
  35. K. Safer, F. Tabet, A. Ouadha, M. Safer, I. Gökalp, “Simulation of a syngas counter-flow diffusion flame structure and NO emissions in the pressure range 1–10 atm,” Fuel processing technology, 123, 2014, pp. 149-158.
  36. Y. Tu, K. Su, H. Liu, S. Chen, Z. Liu, C. Zheng, “Physical and chemical effects of CO2 addition on CH4/H2 flames on a Jet in Hot Coflow (JHC) burner,” Energy & Fuels, 30, 2016, pp. 1390-1399.
  37. Y. Tu, H. Liu, W. Yang, “Flame characteristics of CH4/H2 on a jet-in-hot-coflow burner diluted by N2, CO2, and H2O,” Energy & Fuels, 31, 2017, pp. 3270-3280.

 

 

 

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History

  • Receive Date: 10 August 2021
  • Revise Date: 12 September 2021
  • Accept Date: 15 January 2022

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