自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 13    No. 1    February 2006

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CFD prediction of physical field for multi-air channel
pulverized coal burner in rotary kiln
MA Ai-chun(马爱纯)1, ZHOU Jie-min(周孑民) 1, OU Jian-ping(欧俭平) 1,
 LI Wang-xing(李旺兴)2

1. School of Energy and Power Engineering, Central South University, Changsha 410083, China;
2. Institute of Light Metal, China Aluminum Corp, Zhengzhou 450041, China

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.

 

Key words: CFD; numerical simulation; CFX; physical field; multi-air channel coal burner; rotary kiln

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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