Analysis of gas–solid flow and shaft-injected gas distribution in an oxygen blast furnace using a discrete element method and computational fluid dynamics coupled model--颗粒学报PARTICUOLOGY

Dong, Z., Wang, J., Zuo, H., She, X., & Xue, Q. (2017). Analysis of gas–solid flow and shaft-injected gas distribution in an oxygen blast furnace using a discrete element method and computational fluid dynamics coupled model. Particuology, 32, 63-72. https://doi.org/10.1016/j.partic.2016.07.008

Analysis of gas–solid flow and shaft-injected gas distribution in an oxygen blast furnace using a discrete element method and computational fluid dynamics coupled model

Zeshang Dong, Jingsong Wang, Haibin Zuo, Xuefeng She, Qingguo Xue ^*

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

10.1016/j.partic.2016.07.008

Volume 32, June 2017, Pages 63-72

Received 4 March 2016, Revised 7 July 2016, Accepted 19 July 2016, Available online 9 January 2017, Version of Record 20 April 2017.

E-mail: xueqingguo@ustb.edu.cn; wg0301050510@126.com

Highlights

• Gas–solid flow characteristics in oxygen blast furnace was studied by DEM–CFD coupled model.

• DEM–CFD coupled model was established and applied to study particle distribution characteristics.

• Shaft-injected gas penetration distance in the furnace decreased as the particle diameter decreased.

• In essence, improving gas pressure from shaft tuyere was helpful for injected gas penetrating.

• The model reliability was verified by previous experimental results.

Abstract

Ironmaking using an oxygen blast furnace is an attractive approach for reducing energy consumption in the iron and steel industry. This paper presents a numerical study of gas–solid flow in an oxygen blast furnace by coupling the discrete element method with computational fluid dynamics. The model reliability was verified by previous experimental results. The influences of particle diameter, shaft tuyere size, and specific ratio (X) of shaft-injected gas (SIG) flowrate to total gas flowrate on the SIG penetration behavior and pressure field in the furnace were investigated. The results showed that gas penetration capacity in the furnace gradually decreased as the particle diameter decreased from 100 to 40 mm. Decreasing particle diameter and increasing shaft tuyere size both slightly increased the SIG concentration near the furnace wall but decreased it at the furnace center. The value of X has a significant impact on the SIG distribution. According to the pressure fields obtained under different conditions, the key factor affecting SIG penetration depth is the pressure difference between the upper and lower levels of the shaft tuyere. If the pressure difference is small, the SIG can easily penetrate to the furnace center.

Graphical abstract

Keywords

Oxygen blast furnace; Discrete element method; Computational fluid dynamics; Shaft gas injection; Gas–solid flow; Pressure field

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