Influence of bed conditions on gas flow in the COREX shaft furnace by DEM–CFD modelling

2016 ◽  
Vol 44 (9) ◽  
pp. 685-691 ◽  
Author(s):  
M. H. Bai ◽  
S. F. Han ◽  
W. Y. Zhang ◽  
K. Xu ◽  
H. Long
Keyword(s):  
Gas Flow ◽  
Shaft Furnace ◽  
Cfd Modelling ◽  
Corex Shaft Furnace

scholarly journals Influence of center gas supply device on gas–solid flow in COREX shaft furnace through DEM–CFD model

2020 ◽  
Vol 18 (5-6) ◽  
Author(s):  
Heng Zhou ◽  
Shuyu Wang ◽  
Binbin Du ◽  
Mingyin Kou ◽  
Zhiyong Tang ◽  
...  
Keyword(s):  
Gas Flow ◽  
Shaft Furnace ◽  
Middle Zone ◽  
Cfd Model ◽  
Gas Velocity ◽  
Gas Distribution ◽  
Particle Segregation ◽  
Solid Flow ◽  
Corex Shaft Furnace ◽  
Gas Supply

AbstractIn order to develop the central gas flow in COREX shaft furnace, a new installment of center gas supply device (CGD) is designed. In this work, a coupled DEM–CFD model was employed to study the influence of CGD on gas–solid flow in COREX shaft furnace. The particle descending velocity, particle segregation behaviour, void distribution and gas distribution were investigated. The results show that the CGD affects the particles descending velocity remarkably as the burden falling down to the slot. Particle segregation can be observed under the inverse ‘V’ burden profile, and the influence of CGD on the particle segregation is unobvious on the whole, which causes the result that the voidage is slightly changed. Although the effect of CGD on solid flow is not significant, the gas flow in shaft furnace has an obvious change. Compared with the condition without CGD, in the case with CGD, the gas velocity is improved significantly, especially in the middle zone of the furnace, which further promotes the center gas distribution. Meanwhile, the pressure drop in the furnace with the installation of CGD is increased partly.

Numerical simulation of the effect of burden profile on gas flow in a COREX shaft furnace

2020 ◽  
Vol 376 ◽  
pp. 537-548
Author(s):  
Heng Zhou ◽  
Xu Tian ◽  
Mingyin Kou ◽  
Shengli Wu ◽  
Yanbai Shen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Gas Flow ◽  
Shaft Furnace ◽  
Corex Shaft Furnace

Numerical Simulation of Gas Distribution in COREX Shaft Furnace

2011 ◽  
Vol 287-290 ◽  
pp. 827-830 ◽  
Author(s):  
Wei Feng Ying ◽  
Ye Sun ◽  
Zhi Guo Luo ◽  
Zong Shu Zou
Keyword(s):  
Flow Field ◽  
Gas Flow ◽  
Pressure Field ◽  
Shaft Furnace ◽  
Dead Zone ◽  
Side Wall ◽  
Corex Shaft Furnace ◽  
Flow Through ◽  
Solid Phases ◽  
Gas Flow Field

Pre-reduction shaft furnace is a typical gas solid countercurrent reactor, in which complex transport phenomenon exists between gas-solid phases. In the present paper, a mathematical model has been developed to simulate the actual pressure field of the shaft furnace, the gas flow field and the distribution of gas flow backwards. The simulation results of the pressure field indicate that the pressure is distributed uniformly at the same height in the furnace. The results of gas flow field indicate that the velocity of gas flow near the side wall is larger than that in the inner part, and a gas dead zone exists at the lower part of the shaft furnace. Comparing the volume of gas flow through the every DRI downcomers, it can be drawn that the gas flow from DRI downcomers near the gas export side is higher than the other side.

Characterisation of Static Strip Seal Flow

2007 ◽  
Author(s):  
Arash Farahani ◽  
Peter Childs
Keyword(s):  
Gas Flow ◽  
Pressure Ratio ◽  
Flow Characteristics ◽  
Main Stream ◽  
Cfd Modelling ◽  
Height Range ◽  
And Performance ◽  
Nozzle Guide ◽  
The Cost ◽  
Cooling Air

Strip seals are used in gas turbine engines between two static elements or between components which do not move relative to each other, such as Nozzle Guide Vanes (NGVs). The key role of a strip seal between NGV segments is sealing between the flow through the main stream annulus and the internal air system, a further purpose is to limit the inter-segmental movements. In general the shape of the strip seal is a rectangular strip that fits into two slots in adjacent components. The minimum clearance required for static strip seals must be found by accounting for thermal expansion, misalignment, and application, to allow correct fitment of the strip seals. Any increase in leakage raises the cost due to an increase in the cooling air use, which is linked to specific fuel consumption, and it can also alter gas flow paths and performance. The narrow path within the seal assembly, especially the height has the most significant affect on leakage. The height range of the narrow path studied in this paper is 0.01–0.06 mm. The behaviour of the flow passing through the narrow path has been studied using CFD modelling and measurements in a bespoke rig. The CFD and experimental results show that normalized leakage flow increases with pressure ratio before reaching a maximum. The main aim of this paper is to provide new experimental data to verify the CFD modelling for static strip seals. The typical flow characteristics validated by CFD modelling and experiments can be used to predict the flow behaviour for future static strip seal designs.

scholarly journals DEM Study of Solid Flow in COREX Shaft Furnace with Areal Gas Distribution Beams

2016 ◽  
Vol 56 (2) ◽  
pp. 245-254 ◽  
Author(s):  
Heng Zhou ◽  
Zhi-Guo Luo ◽  
Tao Zhang ◽  
Yang You ◽  
Zong-Shu Zou ◽  
...  
Keyword(s):  
Shaft Furnace ◽  
Gas Distribution ◽  
Solid Flow ◽  
Corex Shaft Furnace

Analyses of solid flow in latest design COREX shaft furnace by physical simulation

2014 ◽  
Vol 42 (3) ◽  
pp. 209-216 ◽  
Author(s):  
H. Zhou ◽  
Z. S. Zou ◽  
Z. G. Luo ◽  
T. Zhang ◽  
Y. You ◽  
...  
Keyword(s):  
Physical Simulation ◽  
Shaft Furnace ◽  
Solid Flow ◽  
Corex Shaft Furnace

Influence of CGD structure on burden descending behavior in COREX shaft furnace

2019 ◽  
Vol 116 (3) ◽  
pp. 304 ◽  
Author(s):  
Xingsheng Zhang ◽  
Zongshu Zou ◽  
Zhiguo Luo
Keyword(s):  
Large Scale ◽  
Gas Flow ◽  
Shaft Furnace ◽  
Three Dimensional ◽  
Interaction Force ◽  
Flow Patterns ◽  
Solid Flow ◽  
Reducing Gas ◽  
A New Technique ◽  
Actual Size

For improving the reducing gas flow in the center of a large-scale shaft furnace, the central gas distribution (CGD) device, a new technique, is proposed and installed in the shaft furnace. Because of its less-developed history, the solid flow in the shaft furnace with CGD is unclear. In this work, a three-dimensional cylindrical model of COREX-3000 shaft furnace in actual size is established based on DEM. Four types of burden, including pellet, lump ore, coke and flux, are taken into consideration in the model. The model is validated by experiment and then it is used to investigate the influence of CGD structure on solid flow patterns, burden descending velocity, interaction force and abrasive wear. The results show that the CGD structure has some effects on the solid flow patterns and burden descending velocity. As the CGD diameter increases, the interaction force between particles is decreased but the total abrasion energy on CGD is increased. As the CGD height increases, both the interaction force between particles and the total abrasion energy on CGD are decreased.

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