Influence of ammonia and Brown gas injection on the iron ore sintering characteristics under biochar substitution--颗粒学报PARTICUOLOGY

Lv, L., Wang, J., Meng, H., & Zhou, H. (2024). Influence of ammonia and Brown gas injection on the iron ore sintering characteristics under biochar substitution. Particuology, 94, 16-28. https://doi.org/10.1016/j.partic.2024.07.015

Influence of ammonia and Brown gas injection on the iron ore sintering characteristics under biochar substitution

Laiquan Lv, Jiankang Wang, Hanxiao Meng, Hao Zhou^*

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

10.1016/j.partic.2024.07.015

Volume 94, November 2024, Pages 16-28

Received 28 February 2024, Revised 17 July 2024, Accepted 23 July 2024, Available online 2 August 2024, Version of Record 7 August 2024.

E-mail: zhouhao@zju.edu.cn

Highlights

• Heating and cooling rates during the sintering process were calculated.

• Effects of Brown gas and ammonia on sintering bed's temperature were studied.

• Effects of Brown gas and ammonia on sintered ore's quality were investigated.

• Effects of two gases replacing biochar on sintering characteristics were explored.

• A low-carbon sintering method using biochar swap and gas injection was obtained.

Abstract

The influence of ammonia and Brown gas injection on the iron ore sintering characteristics was explored through sintering pot experiments based on biochar substitution to increase biochar substitution proportion and reduce fossil energy consumption. By dividing the high-temperature stage of the sintering bed, the heating rate and cooling rate were calculated, and the reasons for poor sintering quality under a high biochar substitution ratio were explored. The results showed that under the 40% biochar substitution ratio, the cooling rate of the sintering bed significantly increased, the high-temperature duration time was short, and the sintering quality deteriorated severely. Additional injection of 0.5–1% vol ammonia or 1–2% vol Brown gas can reduce the cooling rate, prolong the high-temperature duration, and optimize the sintering quality. Based on 1% vol ammonia or 2% vol Brown gas injection, reducing the proportion of biochar with equal calorific value further increases the sintering comprehensive index, which means that using 1% vol ammonia or 2% vol Brown gas injection to assist sintering can reduce the proportion of coke usage to 60%, while the proportion of biochar substitution is 33.76% and 32.47%, respectively. The research results provide an effective solution for low-carbon sintering.

Graphical abstract

Keywords

NH₃ injection; Brown gas injection; Biochar substitution; Iron ore sintering; Coke consumption reduction

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