scholarly journals Vertical Section Observation of the Solid Flow in a Blast Furnace with a Cutting Method

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 127 ◽  
Author(s):  
Yuanxiang Lu ◽  
Zeyi Jiang ◽  
Xinru Zhang ◽  
Jingsong Wang ◽  
Xinxin Zhang
Keyword(s):  
Numerical Simulation ◽  
Blast Furnace ◽  
Discrete Element Method ◽  
Flow Pattern ◽  
Vertical Section ◽  
Plug Flow ◽  
Critical Value ◽  
Solid Flow ◽  
Cutting Method ◽  
Transparent Plate

The solid flow plays an important role in blast furnace (BF) ironmaking. In the paper, the descending behavior of solid flow in BFs was investigated by a cold experimental BF model and numerical simulation via the discrete element method (DEM). To eliminate the flat wall effect on the structure of solid flow in lab observations, a cutting method was developed to observe the vertical section of the solid flow by inserting a transparent plate into the experimental BF model. Both the experimental and numerical results indicated that plug flow is the main solid flow pattern in the upper and middle zones of BFs during burden descending. Meanwhile, a slight convergence flow and a deadman zone form at the lower part of the bosh. In addition, the boundary between the plug flow and convergence flow in BFs was determined by analyzing the velocity of the burden in vertical directions and the Wilcox–Swailes coefficient (Uws). The results indicated that the Uws can be defined as a critical value to determine the solid flow patterns. When Uws ≥ 0.65, the plug flow is dominant. When Uws < 0.65, the convergence flow is dominant. The findings may have important implications to understand the structure of the solid flow in BFs.

Understanding the occurrence of the surface turbulence in a nonpressurized bottom gating system: Numerical simulation of the melt flow pattern

2015 ◽  
Vol 232 (3) ◽  
pp. 230-241 ◽  
Author(s):  
Ali Kheirabi ◽  
Amir Baghani ◽  
Ahmad Bahmani ◽  
Morteza Tamizifar ◽  
Parviz Davami ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Liquid Metal ◽  
Flow Pattern ◽  
Oxide Films ◽  
Critical Value ◽  
Surface Velocity ◽  
Complete Agreement ◽  
Gating System ◽  
Melt Flow ◽  
Surface Turbulence

Surface turbulence during the filling of the mold triggers the entrainment of oxide films, which appears to be detrimental to the soundness of the final casting. Nonpressurized and bottom-gating systems have been employed in order to avoid such casting defects by reducing the surface velocity of the liquid metal. However, recent studies have shown that the melt front velocity in the mold entrance may exceed the critical value in the nonpressurized and bottom-gating systems. Therefore, a study was conducted on numerical simulation melt flow pattern in nonpressurized and bottom-gating systems. It was noted that the liquid metal enters the gate and then mold cavity with a higher velocity by formation of dead zones and vortex flows in runner's end. Therefore, the current designs based on conventional gating system ratio seem to be not optimized and unable to avoid the surface turbulence. Numerical results were in complete agreement with experimental observations. Understanding the reasons for occurrence of the surface turbulence in nonpressurized and bottom-gating systems provides information on the required steps to improve the design of the gating systems and minimize the entrainment of oxide films during the filling of the mold.

scholarly journals Characteristics of Solid Flow and Stress Distribution Including Asymmetric Phenomena in Blast Furnace Analyzed by Discrete Element Method

2010 ◽  
Vol 50 (2) ◽  
pp. 207-214 ◽  
Author(s):  
Shungo Natsui ◽  
Shigeru Ueda ◽  
Zhengyun Fan ◽  
Nils Andersson ◽  
Junya Kano ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Stress Distribution ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Solid Flow ◽  
Element Method

scholarly journals Influence of Blast Furnace Inner Volume on Solid Flow and Stress Distribution by Three Dimensional Discrete Element Method

2010 ◽  
Vol 50 (10) ◽  
pp. 1406-1412 ◽  
Author(s):  
Zhengyun Fan ◽  
Satoru Igarashi ◽  
Shungo Natsui ◽  
Shigeru Ueda ◽  
Tianjun Yang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Stress Distribution ◽  
Discrete Element Method ◽  
Three Dimensional ◽  
Discrete Element ◽  
Solid Flow ◽  
Element Method

scholarly journals A downscaling cold model for solid flow behaviour in a top gas recycling-oxygen blast furnace

2020 ◽  
Vol 39 (1) ◽  
pp. 447-456
Author(s):  
Zhenlong An ◽  
Jingbin Wang ◽  
Yanjun Liu ◽  
Yingli Liu ◽  
Xuefeng She ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Gas Flow ◽  
Stagnant Zone ◽  
Flow Zone ◽  
Cold Model ◽  
Solid Flow ◽  
Oxygen Blast ◽  
Top Gas Recycling ◽  
Batch Weight ◽  
Gas Recycling

AbstractThe top gas recycling-oxygen blast furnace (TGR-OBF) is a reasonable method used to reduce both coke rate and energy consumption in the steel industry. An important feature of this process is shaft gas injection. This article presents an experimental study on the gas–solid flow characteristics in a TGR-OBF using a two-dimensional cold model. The experimental conditions and parameters were determined using a series of similarity criteria. The results showed that the whole flow area in the TGR-OBF can be divided into four distinct flow zones, namely, the stagnant zone, the plug flow zone in the upper part of the shaft, the converging flow zone and the quasi-stagnant flow zone, which is similar to that in a traditional blast furnace. Then the effects of batch weight and the ratio (X) of the shaft injected gas flow rate to the total gas flow rate on solid flow behaviour were investigated in detail. With the increase in batch weight, the shape of the stagnant zone tends to be shorter and thicker. Furthermore, with the increase in X value from 0 to 1, the stagnant zone gradually becomes thinner and higher. The results obtained from the experiments provide fundamental data and a validation for the discrete element method–computational fluid dynamics-coupled mathematical model for TGR-OBFs for future studies.

Sign in / Sign up

Export Citation Format

Share Document