Numerical Simulation of Gas-Solid Two-Phase Flow Characteristics in Cyclone Furnace

doi:10.12068/j.issn.1005-3026.2025.20240029

Abstract

Abstract:

In order to explore the application status and prospects of cyclone furnaces in flash ironmaking technology， numerical simulations were conducted on the gas flow field and particle trajectories within the cyclone furnace using the Eulerian model and DPM， respectively. The effects of the rising gas（smelting reduction vessel gas）velocity and iron ore particle size on the characteristics of gas-solid two-phase flow were analyzed. The results show that the tangential velocity distribution of the vortex field approximately forms a “concave” shape in the lance region and an “M” shape in the region above the lance. As the rising gas velocity increases from 4 m/s to 8 m/s， the maximum tangential velocity of the gas decreases， and the capture rate of the iron ore particles decreases from 98.99% to 93.51%. However， the strong swirling turbulent region gradually moves upward， and the trajectory of the iron ore particles becomes longer， which is more conducive to the melting and reduction. In addition， the capture rate first decreases and then increases with increasing particle size， but the iron ore particles of large size hardly undergo upward spiral motion.

Key words: cyclone furnace, iron ore powder, gas-solid two-phase flow, tangential velocity

CLC Number:

TF 557

Lin QI, Ying-xia QU, Da-peng JIANG, Zong-shu ZOU. Numerical Simulation of Gas-Solid Two-Phase Flow Characteristics in Cyclone Furnace[J]. Journal of Northeastern University(Natural Science), 2025, 46(9): 41-50.

Figures/Tables 17

Fig.1 Schematic diagram of cyclone furnace

Table 1 Geometric parameters of physical model

参数	尺寸
炉高H/ m	6
炉径D/ m	3
喷枪直径Ф/ m	0.032
喷枪层间间距h/ m	0.250
铁矿粉喷枪径向夹角 $α$ / (°)	18.5
两类喷枪径向连线夹角 $β$ / (°)	35.0

Table 1 Geometric parameters of physical model

参数	尺寸
炉高H/ m	6
炉径D/ m	3
喷枪直径Ф/ m	0.032
喷枪层间间距h/ m	0.250
铁矿粉喷枪径向夹角 $α$ / (°)	18.5
两类喷枪径向连线夹角 $β$ / (°)	35.0

Fig.2 Schematic diagram of grid division for cyclone furnace

Fig.3 Carbon dioxide gas velocity at Y=4 m on Z=0 m longitudinal section of cyclone furnace with different grid numbers

Fig.4 Tangential velocity at Z=-0.2 m on Y=0 m longitudinal section of cyclone separator

Table 2 Main operating parameters of different

算例	$S R V 上升气体速度 m ⋅ s - 1$	$铁矿粉喷吹速率 m ⋅ s - 1$	$铁矿粉粒度 μ m$
Case 1	4	30	30
Case 2	6	30	30
Case 3	8	30	30
Case 4	8	30	100
Case 5	8	30	300

Table 2 Main operating parameters of different

算例	$S R V 上升气体速度 m ⋅ s - 1$	$铁矿粉喷吹速率 m ⋅ s - 1$	$铁矿粉粒度 μ m$
Case 1	4	30	30
Case 2	6	30	30
Case 3	8	30	30
Case 4	8	30	100
Case 5	8	30	300

Fig.5 Gas streamline diagram of cyclone furnace

Fig.6 Gas streamline diagram at different heights when rising gas velocity is 4 m/s

Fig.7 Gas streamline diagram at different heights when rising gas velocity is 6 m/s

Fig.8 Gas streamline diagram at different heights when rising gas velocity is 8 m/s

Fig.9 Gas streamline diagram of cyclone furnace in longitudinal section at Z=0 m

Fig.10 Gas streamline diagram of cyclone furnace in longitudinal section at X=0 m

Fig.11 Distribution of tangential velocity at different cross-sectional radial positions when rising gas velocity is 4 m/s

Fig.12 Distribution of tangential velocity at different cross-sectional radial positions when rising gas velocity is 6 m/s

Fig.13 Distribution of tangential velocity at different cross-sectional radial positions when rising gas velocity is 8 m/s

Fig.14 Scattering diagram of captured particles on wall of cyclone furnace

Fig.15 Motion trajectory of particles with different sizes in cyclone furnace

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