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CFD prediction of physical field for multi-air channel pulverized coal burner in rotary kiln

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Abstract

A 3-D numerical simulation with CFX software on physical field of multi-air channel coal burner in rotary kiln was carried out. The effects of various operational and structural parameters on flame feature and temperature distribution were investigated. A thermal measurement was conducted on a rotary kiln (4.5 m in diameter, 90 m in length) with four-air channel coal burner to determine the boundary conditions and to verify the simulation results. The calculation result shows that the distribution of velocity near burner exit is saddle-like; recirculation zones near nozzle and wall are useful for mixture primary air with coal and high temperature fume. A little central airflow can avoid coal backing up and cool nozzle. Adjusting the ratio of internal airflow to outer airflow is an effective and major means to regulate flame and temperature distribution in sintering region. Large whirlcone angle can intensify disturbution range at flame root to accelerate ignition and mixture. Large coal size can reduce high temperature region and result in coal combusting insufficiently. Too much combustion air will lengthen flame and increase heat loss.

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Authors and Affiliations

  1. School of Energy and Power Engineering, Central South University, 410083, Changsha, China

    Ma Ai-chun (Doctoral candidate), Zhou Jie-min & Ou Jian-ping

  2. Institute of Light Metal, China Aluminum Corp, 450041, Zhengzhou, China

    Li Wang-xing

Authors
  1. Ma Ai-chun
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  2. Zhou Jie-min
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  3. Ou Jian-ping
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  4. Li Wang-xing
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Correspondence to Ma Ai-chun.

Additional information

Foundation item: Project(20010533009) supported by the Special Foundation for Doctorate Discipline of China

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Ma, Ac., Zhou, Jm., Ou, Jp. et al. CFD prediction of physical field for multi-air channel pulverized coal burner in rotary kiln. J Cent. South Univ. Technol. 13, 75–79 (2006). https://doi.org/10.1007/s11771-006-0110-9

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  • DOI: https://doi.org/10.1007/s11771-006-0110-9

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