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浙江大学学报(工学版)
浙江大学学报(工学版)
能源与环境工程     
焦粉粒径对烧结床中燃烧带分布的影响
刘子豪, 周昊, 周明熙, 程明, 刘瑞鹏, 岑可法
浙江大学 能源清洁利用国家重点实验室,浙江 杭州 310027
Influence of coke size on combustion zone distribution in sintering bed
LIU Zi hao, ZHOU Hao, ZHOU Ming xi, CHENG Ming, LIU Rui peng, CEN Ke fa
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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摘要：

在烧结杯台架上采用石英砂和焦粉混合模拟铁矿石烧结过程,研究焦粉粒径对烧结燃烧过程的影响.随着焦粉粒径的增加,烧结生料床的透气性改善,燃烧过程中的火焰前锋速度增加.焦粉粒径对燃烧带宽度有重要影响,保持总的焦粉质量分数不变,在1.0～1.4 mm焦粉基础上,增加0.71～1.0 mm焦粉质量分数,燃烧带宽度先增加,当增加至30%时,床层温度分布出现双峰现象,燃烧带宽度减少.提高焦粉质量分数,有利于提高燃烧带温度和增加燃烧带持续时间,减缓甚至消除燃烧带温度分布出现双峰现象.燃烧带中的温度分布出现双峰主要是由于焦粉粒径分布不均或是燃烧带中由于氧量较低造成了焦粉在主燃区内未能燃尽,随着燃烧带的下移,氧气体积分数增加,未燃尽焦粉燃烧加速,燃烧热释放速率增加,床层温度上升.
Abstract:

The mix of quartz sand and coke was used to simulate iron ore sintering in order to investigate the influence of coke size on combustion process in iron ore sintering. When coke size increased, green bed permeability improved and flame front speed increased during the combustion process. Coke size had important influence on the width of combustion zone. If the total coke mass fraction kept constant, the width of combustion zone increased at first when the mass fraction of plus 0.71 minus 1.0 mm coke increased on the basis of plus 1.0 minus 1.4 mm coke. When the mass ratio of plus 0.71 minus 1.0 mm coke increased to 30%, bed temperature distribution appeared the phenomenon of double peak and the width of combustion zone decreased. The increase of coke mass fraction can increase bed temperature and the duration time of combustion zone, retard or remove the double peak phenomenon of combustion zone temperature distribution. The main reasons of the double peak phenomenon of combustion zone temperature distribution are the uneven coke size distribution or low oxygen content in the combustion zone, which results in the failure of coke burn out in primary combustion zone. Oxygen volume fraction increased with combustion zone descending down. Unburned coke accelerated combustion, the rate of heat release increased, and bed temperature rises.
出版日期: 2016-04-01
:  TK 222  
基金资助:

国家自然科学基金资助项目（51476137）.
通讯作者: 周昊,男,教授,博导. ORCID: 0000 0001 9779 7703.     E-mail: zhouhao@cmee.zju.edu.cn
作者简介: 刘子豪(1988—), 男,博士生,从事多孔介质燃烧及NOx控制的研究.ORCID: 0000 0003 3580 7798. E-mail: 13867172653@163.com
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引用本文:

刘子豪, 周昊, 周明熙, 程明, 刘瑞鹏, 岑可法. 焦粉粒径对烧结床中燃烧带分布的影响[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2016.04.013.

LIU Zi hao, ZHOU Hao, ZHOU Ming xi, CHENG Ming, LIU Rui peng, CEN Ke fa. Influence of coke size on combustion zone distribution in sintering bed. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2016.04.013.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2016.04.013    或    http://www.zjujournals.com/eng/CN/Y2016/V50/I4/691

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