scholarly journals Numerical Analysis on Flow Behavior of Molten Iron and Slag in Main Trough of Blast Furnace during Tapping Process

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Li Wang ◽  
Chien-Nan Pan ◽  
Wen-Tung Cheng
Keyword(s):  
Blast Furnace ◽  
Separation Efficiency ◽  
Flow Behavior ◽  
Three Dimensional ◽  
Molten Iron ◽  
Three Dimensional Model ◽  
Operation Conditions ◽  
Main Trough ◽  
Iron Losses ◽  
Volume Method

The three-dimensional model was developed according to number 4 of the main trough of blast furnace at China Steel Co. (CSC BF4). The k-ε equations and volume of fluid (VOF) were used for describing the turbulent flow at the impinging zone of trough, indicating fluids of liquid iron, molten slag, and air in the governing equation, respectively, in this paper. The pressure field and velocity profile were then obtained by the finite volume method (FVM) and the pressure implicit with splitting of operators (PISO), respectively, followed by calculating the wall shear stress through Newton’s law of viscosity for validation. Then, the operation conditions and the main trough geometry were numerically examined for the separation efficiency of iron from slag stream. As shown in the results, the molten iron losses associated with the slag can be reduced by increasing the height difference between the slag and iron ports, reducing the tapping rate, and increasing the height of the opening under the skimmer.

Numerical Analysis on the Refractory Wear of the Blast Furnace Main Trough

2014 ◽  
Vol 92 ◽  
pp. 294-300 ◽  
Author(s):  
Ca Min Chang ◽  
Yon Sen Lin ◽  
Chien Nan Pan ◽  
Wen Tung Cheng
Keyword(s):  
Shear Stress ◽  
Blast Furnace ◽  
Erosion Rate ◽  
Three Dimensional ◽  
Stress Profile ◽  
Refractory Wear ◽  
Main Trough ◽  
Split Operator ◽  
Shear Stress Profile ◽  
Volume Method

This study aims to numerically analyze the refractory wear of the blast furnace main trough. The three dimensional transient Navier-Stocks equation associated with the volume of fluid (VOF) was developed to describe the flow fields of air, molten iron and slag in the main trough of the blast furnace during tapping process; and then solved by the finite volume method (FVM) subject to the pressure implicit with split operator (PSIO). Based on the Newton’s law of viscosity, the computed shear stress profile in the impingement region consists with the erosion rate of main trough from the no. 4 blast furnace at China Steel Corporation (CSC BF4). The influence of the tapping angle and the ratio of iron to slag in tapping stream on the wall shear stress of main trough was also examined for the suggestion to minimize the refractory wear of blast furnace main trough in this work.

Finite Element Analysis of Multi-Ropes Friction Hoister Main Shaft

2012 ◽  
Vol 538-541 ◽  
pp. 1935-1938 ◽  
Author(s):  
Ming Xia Yan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Structure Design ◽  
Main Shaft ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Operation Conditions ◽  
The Finite Element Analysis ◽  
Optimal Designing

Three-dimensional model of the main shaft of JKM4×4 hoister was built based on Pro/E. After having applied boundary conditions and loads to the model, the finite element analysis for the main shaft was conducted under extreme operation conditions with ANSYS, the stress and displacement distribution was presented and the stress biggest hazard points were found. Based on the analysis results, improvement methods for the main shaft structure design was given out, which provides references for further optimal designing the main shaft of hoister.

Numerical Analysis of Flow Behavior Inside the Blast Furnace

2009 ◽  
Author(s):  
Dong Fu ◽  
Fengguo Tian ◽  
Guoheng Chen ◽  
D. Frank Huang ◽  
Chenn Q. Zhou
Keyword(s):  
Blast Furnace ◽  
Gas Flow ◽  
Cfd Simulation ◽  
Flow Behavior ◽  
Three Dimensional ◽  
Furnace Productivity ◽  
Gas Distribution ◽  
Furnace Shaft ◽  
Parametric Studies ◽  
Flow Through

Gas and burden distributions inside a blast furnace play an important role in optimizing gas utilization versus the furnace productivity and minimizing the CO2 emission in steel industries. In this paper, a mathematical model is presented to describe the burden descent in the blast furnace shaft and gas distribution, with the alternative structure of coke and ore layers being considered. Multi-dimensional Ergun’s equation is solved with considering the turbulent compressible gas flow through the burden column. The porosity of each material will be treated as a function of three dimensional functions which will be determined by the kinetics sub-models accordingly. A detailed investigation of gas flow through the blast furnace will be conducted with the given initial burden profiles along with the effects of redistribution during burden descending. Also, parametric studies will be carried out to analyze the gas distribution cross the blast furnace under different cohesive zone (CZ) shapes, charging rate, and furnace top pressure. A good agreement was obtained between the CFD simulation and published experimental data. Based on the results, the inverse V shape is proved to be the most desirable CZ profile.

scholarly journals Numerical Analysis on Erosion and Optimization of a Blast Furnace Main Trough

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4851
Author(s):  
Hao Yao ◽  
Huiting Chen ◽  
Yao Ge ◽  
Han Wei ◽  
Ying Li ◽  
...  
Keyword(s):  
Blast Furnace ◽  
High Efficiency ◽  
Low Cost ◽  
Continuous Production ◽  
Hot Metal ◽  
Main Trough ◽  
Impact Position ◽  
Refractory Life ◽  
Volume Method ◽  
The Impact

The main trough of a blast furnace (BF) is a main passage for hot metal and molten slag transportation from the taphole to the torpedo and the slag handling. Its appropriate working status and controlled erosion ensure a safe, stable, high-efficiency and low-cost continuous production of hot metal. In this work, the tapping process of a main trough of a BF in the east of China was numerically studied with the help of a CFD library written in C++, called OpenFOAM, based on the use of the Finite Volume Method (FVM). The results show that turbulence intensity downstream of the hot metal impact position becomes weaker and the turbulence area becomes larger in the main trough. During the tapping, thermal stress of wall refractory reaches the maximum value of 1.7 × 107 Pa at the 4 m position in the main trough. Furthermore, baffles in the main trough placed between 5.8 m and 6.2 m were found to control and reduce the impact of the turbulence on the refractory life. The metal flowrate upstream of the baffles can be decreased by 6%, and the flow velocity on the upper sidewall and bottom wall decrease by 9% and 7%, respectively, compared with the base model. By using baffles, the minimum fatigue life of the refractory in the main trough increases by 15 tappings compared with the base model, so the period between the maintenance stops can be prolonged by about 2 days.

Research on Stress Acoustic Model in the Process of Mechanical Self-Excited Vibration Based on Finite Element Method

2013 ◽  
Vol 443 ◽  
pp. 189-193
Author(s):  
Chuan Xiong Chen
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
The Self ◽  
Vibration Source ◽  
Mechanical Device ◽  
Three Dimensional Model ◽  
Excited Vibration ◽  
Derivation Formula ◽  
Mechanical Devices ◽  
Volume Method

The self-excited vibration of machinery is a common vibration in mechanical vibrations. Mechanical self-excited vibration destroys the normal working of the mechanical device and leads to mechanical fatigue damage. If the self-excited vibration reaches to the vibration frequency of machinery, it can produce the resonance and result in the scrapping of mechanical devices. The study of mechanical self-excited vibration has great significance. According to mathematical finite element methods, this paper establishes the mathematical model of the mechanical natural frequency through the finite volume method and gives the mathematical derivation formula of mechanical devices self-vibrated frequency. The second part of the paper simulates self-vibrated process of machinery using the professional software ANSYS software. First, it establishes a three-dimensional model of the mechanical device through the pre-processing module and analyzes mechanical self-excited vibration through calculation module and gets the frequency modal map of self-excited vibration process. It studies the mechanism of the mechanical self-excited vibration combining with modern signal analysis techniques--wavelet analysis. It gets the vibration source location which provides a reliable theoretical basis for the study of mechanical self-excited vibration.

scholarly journals Preliminary Results of Numerical Simulation of Slug Flow in a Regular T-Junction

2018 ◽  
Vol 225 ◽  
pp. 03001
Author(s):  
Minh Tran ◽  
Zeeshan Memon ◽  
William Pao ◽  
Fakhruldin M Hashim
Keyword(s):  
Slug Flow ◽  
Two Phase Flow ◽  
Separation Efficiency ◽  
Flow Behavior ◽  
Three Dimensional ◽  
Piping System ◽  
Phase Flow ◽  
Two Phase ◽  
Ansys Fluent ◽  
System A

Excessive liquid carryover in T-junction due to splitting nature of two-phase flow causes serious issues in piping system. A three-dimensional numerical model is employed to investigate two-phase flow split behavior of slug flow in a circular-section regular T-junction with 0.0752 m diameter. The Volume of Fraction method combined with k-ε turbulence model and initial sinusoidal perturbation in ANSYS FLUENT is adopted to characterize the effect of slug flow behavior on the phase separation efficiency. The preliminary result reveals that the simulation work can study slug flow split in great detail and the slug characteristic plays an important role in understanding split behavior.

scholarly journals Numerical Simulation of Effects of Different Operational Parameters on the Carbon Solution Loss Ratio of Coke inside Blast Furnace

Processes ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 528 ◽  
Author(s):  
Kou ◽  
Zhou ◽  
Wang ◽  
Hong ◽  
Yao ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Gas Injection ◽  
Three Dimensional ◽  
Coke Oven ◽  
Oxygen Enrichment ◽  
Steel Scrap ◽  
Loss Ratio ◽  
Operational Parameters ◽  
Coke Oven Gas ◽  
Three Dimensional Model

Carbon solution loss reaction of coke gasification is one of the most important reasons for coke deterioration and degradation in a blast furnace. It also affects the permeability of gas and fluids, as well as stable working conditions. In this paper, a three dimensional model is established based on the operational parameters of blast furnace B in Bayi Steel. The model is then used to calculate the effects of oxygen enrichment, coke oven gas injection, and steel scrap charging on the carbon solution loss ratio of coke in the blast furnace. Results show that the carbon solution loss ratio of coke gasification for blast furnace B is almost 20% since the results of a model are probably only indicative. The oxygen enrichment and the addition of steel scrap can reduce the carbon solution loss ratio with little effect on the working condition. However, coke oven gas injection increases the carbon solution loss ratio. Therefore, coke oven gas should not be injected into the blast furnace unless the quality of the coke is improved.

scholarly journals Numerical Analysis on Velocity and Temperature of the Fluid in a Blast Furnace Main Trough

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 249
Author(s):  
Yao Ge ◽  
Meng Li ◽  
Han Wei ◽  
Dong Liang ◽  
Xuebin Wang ◽  
...  
Keyword(s):  
Shear Stress ◽  
Blast Furnace ◽  
Wall Shear Stress ◽  
Molten Slag ◽  
Three Dimensional ◽  
Furnace Process ◽  
Main Trough ◽  
Mechanical Erosion ◽  
Wall Shear ◽  
Fourier Equation

The main trough is a part of the blast furnace process for hot metal and molten slag transportation from the tap hole to the torpedo, and mechanical erosion of the trough is an important reason for a short life of a campaign. This article employed OpenFoam code to numerically study and analyze velocity, temperature and wall shear stress of the fluids in the main trough during a full tapping process. In the code, a three-dimensional transient mass, momentum and energy conservation equations, including the standard k-ε turbulence model, were developed for the fluid in the trough. Temperature distribution in refractory is solved by the Fourier equation through conjugate heat transfer with the fluid in the trough. Change velocities of the fluid during the full tapping process are exactly described by a parabolic equation. The investigation results show that there are strong turbulences at the area of hot metal’s falling position and the turbulences have influence on velocity, temperature and wall shear stress of the fluid. With the increase of the angle of the tap hole, the wall shear stress increases. Mechanical erosion of the trough has the smallest value and the campaign of the main trough is estimated to expand over 5 days at the tap hole angle of 7°.

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