Numerical Analysis of the Characteristics Inside Pre-reduction Shaft Furnace and Its Operation Parameters Optimization by Using a Three-Dimensional Full Scale Mathematical Model

Xu, Jian; Wu, Shengli; Kou, Mingyin; Du, Kaiping

doi:10.2355/isijinternational.53.576

Cited by 43 publications

(29 citation statements)

References 29 publications

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“…However, due to its short history in comparison with blast furnace process, the C-3000 process faces lots of problems, such as gas distribution and burden sticking in CSF. [6][7][8][9][10][11] In terms of screws in CSF, eight screws are centrosymmetrically located at the bottom of CSF in order to discharge burdens into the melter gasifier for further reaction. The screws determine the particle descending velocity along the radius, which has significant effect on the gas distribution, and further on the smooth and efficient operation in CSF.…”

Section: Introductionmentioning

confidence: 99%

Distribution of Particle Descending Velocity in the COREX Shaft Furnace with DEM Simulation

Kou

Shen

et al. 2013

ISIJ Int.

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Screws in COREX shaft furnace are used to discharge burdens to the latter processor -the melter gasifier. They play a very important role in the uniform drawdown pattern, which directly affects the uniform gas distribution and further the smooth operation in the COREX shaft furnace. Therefore, a three dimensional model is established based on the discrete element method (DEM) in the present work. The model is used to investigate the effect of the bottom diameter of COREX shaft furnace, the cylinder height and the screw flight diameter on particle descending velocity along the radius during discharging process. Results show that the descending velocity decreases along the radial direction. It is better to decrease the bottom diameter of COREX shaft furnace, or the screw flight diameter, or to increase the cylinder height in order to achieve a uniform descending velocity along the radius. An optimization model is also proposed for uniform drawdown pattern in the end.

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Section: Introductionmentioning

confidence: 99%

Distribution of Particle Descending Velocity in the COREX Shaft Furnace with DEM Simulation

Kou

Shen

et al. 2013

ISIJ Int.

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“…In particular, steady state models with some assumptions have been proposed to understand the heat and mass balance. [3][4][5][6][7] These models are useful for an overall understanding of the process. Nevertheless, the transient features are often missing in these models, which can play a significant role in the operation of the process.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Gas-solid Flow in the Reduction Shaft of COREX

Hou

Samman

et al. 2014

ISIJ Int.

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COREX is a promising alternative to blast furnace ironmaking. It includes two main reactors: a reduction shaft (RS) for the direct reduction of iron ore and a melter gasifier for the melting reduction of directly reduced iron. This work uses a two-dimensional slot model to investigate the gas-solid flow in the RS by a combined computational fluid dynamics and discrete element method approach. The three-dimensional flow of cohesive solids is then examined for three RS designs by the discrete element method. The effects of gas flow, the stickiness between particles, the rotational speed of screws, and different designs are depicted in terms of gas-solid flow pattern, overall bed pressure drop and solid flowrate. The results show that the effect of gas flow is insignificant on gas-solid flow pattern due to the small gas-solid interaction forces under the considered conditions. Solid flow varies in a complex manner with the rotational speed of screws and the sticking force, and a correlation is formulated for predicting the solid flowrate based on the simulated results. It is also shown that the effect of geometrical design on solid flow is complicated and significant. Caution should be taken for any changes in the design. The findings should be useful for the design, control and optimization of the RS operation.

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“…33 A 3D model is required to obtain a better simulation and prediction. Xu et al 34 then developed a 3D full-scale mathematical model under steady state to study the inner characteristics of the COREX shaft furnace. They also studied the influences of reducing gas temperature, composition, TGC and productivity on gas utilization and solid metallization in order to optimize operational conditions.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Operational Parameters on the Characteristics of Gas–Solid Flow Inside the COREX Shaft Furnace

Kou

et al. 2014

JOM

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The COREX shaft furnace is of great importance to the whole C-3000 process.There are many problems with the operation of the COREX shaft furnace, especially with gas and burden distribution, that have as yet been little studied. The present work establishes a three-dimensional quarter model. After validation by operating data in Baosteel, the model is used to investigate the gas utilization rate and the metallization rate of the COREX shaft furnace. The parameters, including the reducing gas flow, the volume fraction of gas phase, and the multilayered burden, are systematically investigated. The results show that the reducing gas flow has a great influence on the gas utilization rate and the metallization rate, while the volume fraction of gas phase has a more significant effect on the metallization rate than on the gas utilization rate. In order to obtain a higher metallization rate, the reducing gas flow needs to be adjusted step by step and the volume fraction of gas phase needs to be increased. In addition, ore and coke need to be discharged separately in order to increase the solid metallization rate.

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Numerical Analysis of the Characteristics Inside Pre-reduction Shaft Furnace and Its Operation Parameters Optimization by Using a Three-Dimensional Full Scale Mathematical Model

Cited by 43 publications

References 29 publications

Distribution of Particle Descending Velocity in the COREX Shaft Furnace with DEM Simulation

Distribution of Particle Descending Velocity in the COREX Shaft Furnace with DEM Simulation

Modeling the Gas-solid Flow in the Reduction Shaft of COREX

The Effect of Operational Parameters on the Characteristics of Gas–Solid Flow Inside the COREX Shaft Furnace

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