Wind-oxygen balance model of flue gas circulation in sintering
WANG Zhao-cai,ZHOU Zhi-an,HU Bing,SUN Ying,YE Heng-di,WANG Min
(National Engineering Research Center of Sintering and Pelletizing Equipment System, Zhongye Changtian International Engineering Co., Ltd., Changsha 410205, Hunan, China)
Abstract:Based on comprehensive understanding of the features of sintering flue gas,the wind-oxygen balance model of flue gas circulation was developed. By analyzing the simulation results,how the recycled sintering flue gas oxygen content,oxy-enriched gas oxygen content,and leak rate of sintering machine influenced the circulation rate of flue gas of sintering were studied,and then the reasonable schemes for inner and outer gas circulation were suggested. The results show that,at the first several wind boxes,the oxygen volume content of sintering flue gas was low (10%-13%),and after the No. 18 wind box,the oxygen content grew gradually. The gas temperature of gas became higher,the gas density reduced and the flow speed became high,while the variation of gas flow capacity under standard condition was not distinct for every branch pipe of wind box. The higher the oxygen content of recycled sintering flue gas and oxygen-enriched gas,and the lower the leakage rate of sintering machine,the higher the circulation rate of sintering flue gas. Taking the hot wind in circular cooler as the oxygen-enriched gas,the inner and outer circulation rate of sintering flue gas could reach to 30%. Taking the industrial pure oxygen as the oxygen-enriched gas,the inner circulation rate could 40.70%,and the outer circulation rate would be 59.93%. Inner circulation process needs to take wind at the branch pipe of wind box,which is easy,but large power frequency conversion fan should be equipped. Hence,lots of changes should be made and the fixed investment is high. So,the inner circulation process is proper for new project. Meanwhile outer circulation process takes wind at the flue behind main drawing fan,so rebirth effect on sintering process after flue gas once cycle cannot be avoided. Outer circulation process is more suitable for renovation project,because low-power induced draft fan is enough.
收稿日期: 2015-08-11
出版日期: 2015-12-03
引用本文:
王兆才,周志安,胡 兵,孙 英,叶恒棣,王 敏. 烧结烟气循环风氧平衡模型[J]. 钢铁, 2015, 50(12): 53-59.
WANG Zhao-cai,ZHOU Zhi-an,HU Bing,SUN Ying,YE Heng-di,WANG Min. Wind-oxygen balance model of flue gas circulation in sintering. Iron and Steel, 2015, 50(12): 53-59.
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