Influence of coke size on combustion zone distribution in sintering bed

被引：1

作者：

Liu Z.-H. ^{[1
]}

Zhou H. ^{[1
]}

Zhou M.-X. ^{[1
]}

Cheng M. ^{[1
]}

Liu R.-P. ^{[1
]}

Cen K.-F. ^{[1
]}

机构：

[1] State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou

来源：

Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2016年 / 50卷 / 04期

关键词：

Coke size; Combustion zone; Double peak; Sintering;

D O I：

10.3785/j.issn.1008-973X.2016.04.013

中图分类号：

学科分类号：

摘要：

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. © 2016, Zhejiang University Press. All right reserved.

引用

页码：691 / 697and791

共 16 条

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