CFD‐DEM Study of Heat Transfer in the Reduction Shaft of Corex

Corex has a great potential to produce hot metal economically and environmentally friendly. Reduction shaft (RS) for the direct reduction of iron ore is one of the two major reactors in Corex. This work uses a two-dimensional slot model to investigate the thermal behavior of the gas–solid flow in the RS by a combined computational fluid dynamics and discrete element method approach.The general heat transfer characteristics are firstly examined. The complicated transient gas–solid and heat transfer phenomena are demonstrated in the RS process. Then, the effects of discharge rate and two common burden profiles are investigated qualitatively. The results show a linear relation between the steady state bed temperature and discharge rate, which could be helpful for the construction of a reliable scaled down discrete particle model of the RS. The difference between the temperature distributions for two burden profiles is illustrated, which indicates that the control of burden profile could be an effective method to improve energy efficiency. These findings should be useful for the control and optimization of the RS operation.

[1]  Qi Zhou,et al.  Basic Characteristics of the Shaft Furnace of COREX® Smelting Reduction Process Based on Iron Oxides Reduction Simulation , 2010 .

[2]  Subrata Pal,et al.  Mathematical model of COREX melter gasifier: Part I. Steady-state model , 2003 .

[3]  Sheng-fa Liu,et al.  Microstructures and Mechanical Properties of Helical Bevel Gears Made by Mn-Cu Alloyed Austempered Ductile Iron , 2012 .

[4]  T. B. Anderson,et al.  Fluid Mechanical Description of Fluidized Beds. Equations of Motion , 1967 .

[5]  P. Cundall,et al.  A discrete numerical model for granular assemblies , 1979 .

[6]  P. K. Gupta,et al.  Operating experiences with Corex and blast furnace at JSW Steel Ltd , 2008 .

[7]  Jun-jie Sun,et al.  Mathematical Simulation of Burden Distribution in COREX Melter Gasifier by Discrete Element Method , 2012 .

[8]  Aibing Yu,et al.  Numerical simulation of the gas-solid flow in a fluidized bed by combining discrete particle method with computational fluid dynamics , 1997 .

[9]  Aibing Yu,et al.  DEM study of the flow of cohesive particles in a screw feeder , 2014 .

[10]  Runyu Yang,et al.  Discrete particle simulation of particulate systems: A review of major applications and findings , 2008 .

[11]  A. Yu,et al.  Discrete particle simulation of particle–fluid flow: model formulations and their applicability , 2010, Journal of Fluid Mechanics.

[12]  Aibing Yu,et al.  Finite element analysis of the rolling friction of a viscous particle on a rigid plane , 2011 .

[13]  Yanping Xiao,et al.  A Comprehensive Static Model for COREX Process , 2012 .

[14]  Aibing Yu,et al.  Modeling the Gas-solid Flow in the Reduction Shaft of COREX , 2014 .

[15]  Aibing Yu,et al.  Computational study of heat transfer in a bubbling fluidized bed with a horizontal tube , 2012 .

[16]  Aibing Yu,et al.  Micromechanical modeling and analysis of different flow regimes in gas fluidization , 2012 .

[17]  Yuqing Feng,et al.  Discrete particle simulation of gas fluidization of particle mixtures , 2004 .

[18]  Paul Zulli,et al.  Particle scale study of heat transfer in packed and bubbling fluidized beds , 2009 .

[19]  Shengli Wu,et al.  DEM Simulation of Burden Distribution in the Upper Part of COREX Shaft Furnace , 2013 .

[20]  Zongshu Zou,et al.  Validation and Calibration Approach for Discrete Element Simulation of Burden Charging in Pre-reduction Shaft Furnace of COREX Process , 2013 .

[21]  A. Yu,et al.  Discrete particle simulation of particulate systems: Theoretical developments , 2007 .

[22]  A. Yu,et al.  Computational study of the effects of material properties on heat transfer in gas fluidization , 2012 .

[23]  Shengli Wu,et al.  Distribution of Particle Descending Velocity in the COREX Shaft Furnace with DEM Simulation , 2013 .

[24]  S. Komar Kawatra,et al.  DIRECT IRON SMELTING REDUCTION PROCESSES , 2008 .

[25]  Shengli Wu,et al.  Numerical Analysis of the Characteristics Inside Pre-reduction Shaft Furnace and Its Operation Parameters Optimization by Using a Three-Dimensional Full Scale Mathematical Model , 2013 .

[26]  Nan Wang,et al.  Analysis of Material and Energy Consumption of Corex C3000 , 2008 .