Oxycoal combustion was numerically simulated in a lab-scale cylindrical furnace (Φ200 mm × 2 m) with high-velocity oxygen jets. The mesoscopic characteristics of turbulent flame behavior such as nondimensional numbers ReT, Ka, and Da were calculated under different jet positions and jet spacing. The results show that for coflow burners, large spacing (L = 75 mm) is not favored due to poor radial mixing and the restriction of wall; except L = 75 mm, as jet spacing increases, the oxidizer flow could be internally diluted to a lower concentration and preheated to a higher temperature, at least 1000 K; for L = 60 mm conditions, the maximum temperature increase is lower than the ignition temperature (437 °C), they are, namely, oxycoal moderate or intense low oxygen dilution (MILD) combustion. For MILD conditions, the mesoscopic parameters of the flame front where temperature gradient is the largest locate in the distributed regime corresponding to l/lF > 1, ReT > 1, Kaδ > 1, and Da < 1, the global regime is depicted as 1 < l/lF < 4, 60 < ReT < 150, 50 < Ka < 500, and Da < 1; for flaming conditions, the regime is depicted as 1 < l/lF < 6, 40 < ReT < 110, 10 < Ka < 800, and Da < 1.
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November 2017
Research-Article
Turbulent Flame Characteristics of Oxycoal MILD Combustion
Ruochen Liu,
Ruochen Liu
Department of Mechanical and
Energy Engineering,
Tongji University,
Shanghai 201804, China
Energy Engineering,
Tongji University,
Shanghai 201804, China
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Enke An
Enke An
Department of Mechanical and
Energy Engineering,
Tongji University,
Shanghai 201804, China
Energy Engineering,
Tongji University,
Shanghai 201804, China
Search for other works by this author on:
Ruochen Liu
Department of Mechanical and
Energy Engineering,
Tongji University,
Shanghai 201804, China
Energy Engineering,
Tongji University,
Shanghai 201804, China
Enke An
Department of Mechanical and
Energy Engineering,
Tongji University,
Shanghai 201804, China
Energy Engineering,
Tongji University,
Shanghai 201804, China
1Corresponding author.
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received September 8, 2016; final manuscript received June 14, 2017; published online July 17, 2017. Assoc. Editor: Reza Sheikhi.
J. Energy Resour. Technol. Nov 2017, 139(6): 062206 (8 pages)
Published Online: July 17, 2017
Article history
Received:
September 8, 2016
Revised:
June 14, 2017
Citation
Liu, R., and An, E. (July 17, 2017). "Turbulent Flame Characteristics of Oxycoal MILD Combustion." ASME. J. Energy Resour. Technol. November 2017; 139(6): 062206. https://doi.org/10.1115/1.4037190
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