Combustion characteristics of different types of quasi-particles in iron ore sintering process

被引：0
|
作者：
Ma P.-N. [1 ]
Cheng M. [1 ]
Zhou M.-X. [1 ]
Li Y.-W. [1 ]
Zhou H. [1 ]
机构：
[1] State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou
来源：
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | 2019年 / 41卷 / 03期
关键词：
Conversion rate of fuel-N to NO[!sub]x[!/sub; Iron ore sintering; Mass conversion rate; NO[!sub]x[!/sub] emissions; Quasi-particle;
D O I：
10.13374/j.issn2095-9389.2019.03.004
中图分类号：
学科分类号：
摘要：
The iron ore sintering process is the main source of NOx emissions and accounts for about 48% of the total NOx emissions in the iron and steel industry. The generated NOx is mainly from fuel consumption, and it usually exists in the form of quasi-particle in iron ore sintering bed. Therefore, it is important to deeply understand the combustion characteristics and NOx formation mechanism of quasi-particles in iron ore sintering process. Based on this, the effects of coke breeze particle size, presence of an adhering layer of quasi-particles, adhering ratio of quasi-particle, and coke breeze content on the mass conversion rate of different types of quasi-particles and conversion rate of fuel-N to NOx were investigated in a vertical quartz tube reactor in detail. The results show that the mass conversion rate decreases with increasing coke breeze particle size for S'- and S-type quasi-particles; the conversion rate of fuel-N to NOx decreases with increasing coke breeze particle size for S'-type quasi-particle and exhibits the opposite trend for S-type quasi-particle, which is because of the presence of an adhering layer consisting of fine iron ore and limestone. Considering the combustion characteristics of S-and S'-type quasi-particles, the presence of an adhering layer of quasi-particles favors the increase of mass conversion rate and conversion rate of fuel-N to NOx. The mass conversion rate and conversion rate of fuel-N to NOx both decrease with increasing adhering ratio for C-type quasi-particles whose adhering layer consists of fine limestone and coke breeze. For P-type quasi-particles comprising coke breeze, fine limestone, and fine iron ore, the mass conversion rate decreases with increasing coke breeze content. The conversion rate of fuel-N to NOx is not linear and reaches the lowest value when coke breeze content is 50%. © All right reserved.
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页码：316 / 324
页数：8
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