Influence of coke rate on thermal treatment of waste selective catalytic reduction (SCR) catalyst during iron ore sintering

doi:10.1016/j.cjche.2021.02.029

中国化学工程学报 ›› 2022, Vol. 42 ›› Issue (2): 415-423.DOI: 10.1016/j.cjche.2021.02.029

Influence of coke rate on thermal treatment of waste selective catalytic reduction (SCR) catalyst during iron ore sintering

Pengnan Ma, Jiankang Wang, Hanxiao Meng, Laiquan Lv, Hao Fang, Kefa Cen, Hao Zhou

State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China

收稿日期:2020-08-03 修回日期:2021-02-20 出版日期:2022-02-28 发布日期:2022-03-30
通讯作者: Hao Zhou,E-mail:zhouhao@zju.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (52036008).

Influence of coke rate on thermal treatment of waste selective catalytic reduction (SCR) catalyst during iron ore sintering

Pengnan Ma, Jiankang Wang, Hanxiao Meng, Laiquan Lv, Hao Fang, Kefa Cen, Hao Zhou

State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China

Received:2020-08-03 Revised:2021-02-20 Online:2022-02-28 Published:2022-03-30
Contact: Hao Zhou,E-mail:zhouhao@zju.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (52036008).

摘要/Abstract

摘要： Waste selective catalytic reduction (SCR) catalyst as a hazardous waste has a significant impact on the environment and human health. In present study, a novel technology for thermal treatment of waste SCR catalyst was proposed by adding it to sinter mix for iron ore sintering. The influences of coke rate on the flame front propagation, sinter microstructure, and sinter quality during sintering co-processing the waste SCR catalyst process were studied. In situ tests results indicated the maximum sintering bed temperature increased at higher coke rate, indicating more liquid phase generated and higher airflow resistance. The sintering time was longer and the calculated flame front speed dropped at higher coke rate. Sinter microstructure results found the coalescence and reshaping of bubbles were more fully with increasing coke rate. The porosity dropped from 35.28% to 25.66%, the pore average diameter of large pores decreased from 383.76 μm to 311.43 μm. With increasing coke rate, the sinter indexes of tumbler index, productivity, and yield, increased from 33.2%, 9.2 t·m^-2·d^-1, 28.9% to 58.0%, 36.0 t·m^-2·d^-1, 68.9%, respectively. Finally, a comprehensive index was introduced to systematically assess the influence of coke rate on sinter quality, which rose from 100 to 200 when coke rate was increased from 3.5% (mass) to 5.5% (mass).

关键词: Flame front, Waste selective catalytic reduction (SCR) catalyst, Thermal treatment, Iron ore sintering

Abstract: Waste selective catalytic reduction (SCR) catalyst as a hazardous waste has a significant impact on the environment and human health. In present study, a novel technology for thermal treatment of waste SCR catalyst was proposed by adding it to sinter mix for iron ore sintering. The influences of coke rate on the flame front propagation, sinter microstructure, and sinter quality during sintering co-processing the waste SCR catalyst process were studied. In situ tests results indicated the maximum sintering bed temperature increased at higher coke rate, indicating more liquid phase generated and higher airflow resistance. The sintering time was longer and the calculated flame front speed dropped at higher coke rate. Sinter microstructure results found the coalescence and reshaping of bubbles were more fully with increasing coke rate. The porosity dropped from 35.28% to 25.66%, the pore average diameter of large pores decreased from 383.76 μm to 311.43 μm. With increasing coke rate, the sinter indexes of tumbler index, productivity, and yield, increased from 33.2%, 9.2 t·m^-2·d^-1, 28.9% to 58.0%, 36.0 t·m^-2·d^-1, 68.9%, respectively. Finally, a comprehensive index was introduced to systematically assess the influence of coke rate on sinter quality, which rose from 100 to 200 when coke rate was increased from 3.5% (mass) to 5.5% (mass).

Key words: Flame front, Waste selective catalytic reduction (SCR) catalyst, Thermal treatment, Iron ore sintering

Pengnan Ma, Jiankang Wang, Hanxiao Meng, Laiquan Lv, Hao Fang, Kefa Cen, Hao Zhou. Influence of coke rate on thermal treatment of waste selective catalytic reduction (SCR) catalyst during iron ore sintering[J]. 中国化学工程学报, 2022, 42(2): 415-423.

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Influence of coke rate on thermal treatment of waste selective catalytic reduction (SCR) catalyst during iron ore sintering

Influence of coke rate on thermal treatment of waste selective catalytic reduction (SCR) catalyst during iron ore sintering

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