Design changes to main troughs to reduce loss of pig iron with slag

Antonov, A. A.; Mar'yasov, M. F.; Khoroshikov, V. V.

doi:10.1007/bf00740892

Cited by 3 publications

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“…The results indicated that the content of hot metal in the slag can be reduced by increasing the height of the lower opening of the skimmer and by reducing the tapping rate. Antonov et al [12] adjusted the distance between the slag outlet and the skimmer and the width of the slag outlet to influence the internal flow field of the trough. On the basis of Fluent simulation and hydraulic model experiments, Luomala et al [13] studied and optimized the flow field of the main trough by inserting a box into it.…”

Section: Introductionmentioning

confidence: 99%

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

Yao

Chen

et al. 2021

Materials

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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.

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Section: Introductionmentioning

confidence: 99%

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

Yao

Chen

et al. 2021

Materials

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“…Luomala et al utilized physical and mathematical models to investigate the effects of flow controllers, the height of the bath level, the height between the slag and iron ports, and the height of the opening under the skimmer on fluid flows in the blast furnace trough . Antonov et al found that an L‐shaped main trough helps to reduce metal loss compared with a conventional or a transverse main trough in practical experiments . Kim et al investigated the effects of oil viscosity, oil volume, total flow rate, and the volume fractions of water and oil on flow behavior and metal‐slag separation efficiency in the blast furnace trough by using a water‐oil physical model .…”

Section: Introductionmentioning

confidence: 99%

Effects of Blast Furnace Main Trough Geometry on the Slag‐Metal Separation Based on Numerical Simulation

Kou

Yao

et al. 2018

steel research int.

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The complete separation of hot metal from slag is expected in the main trough of a blast furnace. However, in practice slag may take some hot metals away when it goes through the slag port. Therefore, it is important to optimize the slag‐metal separation in order to decrease the metal loss associated with the slag. The present work establishes a three dimensional unsteady model of the main trough of a blast furnace in Panzhihua Steel. The model is then applied to investigate the effects of the width, depth, and bottom slope on the flow behavior and slag‐metal separation. The results show that the high velocity regions and the velocity difference between the hot metal and slag are the main cause of hot metal drawn into the slag. The change of main trough geometry has a major impact on the flow behavior and slag‐metal separation. The slag‐metal separation is improved a lot by decreasing the bottom slope of the main trough or increasing its width. Therefore, it is strongly recommended that the main trough have a horizontal bottom or that its width be increased in order to obtain a better slag‐metal separation.

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“…In the agitated mixing vessel, the mean diameter of droplets is a function of Weber number [11], viscosity ratio between two phases, and the geometrical factors [12]. An increase in the slag volume leads to a reduction in metal losses because of the greater pressure of the slag column on the pig iron [13]. However, there may exist a certain lower limit of the level when the slag penetration into molten iron [14] is taken into account.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Pan

Cheng

2017

Advances in Numerical Analysis

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The three-dimensional model was developed according to number 4 of the main trough of blast furnace at China Steel Co. (CSC BF4). The -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.

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Design changes to main troughs to reduce loss of pig iron with slag

Cited by 3 publications

References 0 publications

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

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

Effects of Blast Furnace Main Trough Geometry on the Slag‐Metal Separation Based on Numerical Simulation

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

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