scholarly journals Bubble Formation by Short Plunging Jet in a Continuous Casting Tundish

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1590
Author(s):  
Sheng Chang ◽  
Zheng Liu ◽  
Zongshu Zou ◽  
Lei Shao ◽  
Baokuan Li
Keyword(s):  
Continuous Casting ◽  
Liquid Steel ◽  
Coming Out ◽  
Bubble Formation ◽  
Free Fall ◽  
Slag Layer ◽  
Gas Entrainment ◽  
Continuous Casting Tundish ◽  
The Impact ◽  
Small Bubbles

A short plunging jet technique was developed to produce small bubbles in continuous casting tundish, with argon sealing, in order to promote the removal of inclusions smaller than 50 μm. The liquid steel coming out of the ladle shroud is accelerated and vibrated by gravity, leading to gas entrainment. This novel approach is free from bubbles growing along the nozzle surface due to the poor wetting condition, which is applicable to producing small bubbles in liquid steel. Water modeling was carried out to investigate the impact of the free-fall length on gas entrainment by a short plunging jet. The results show that gas can be entrained into the liquid bath with a free fall longer than 15 mm. Part of the entrained gas is separated from the gas sheath by the rough surface of the inflow stream, forming initial bubbles. These initial bubbles are further refined into small ones of 0.4~2.5 mm due to the turbulent flow in the pouring region. The cylindrical shield can effectively isolate the surface fluctuation caused by the short plunging jet; thereby, a stable slag layer in the tundish can be maintained during gas entrainment.

Non-Isothermal Fluid Flow in a Continuous Casting Tundish

2010 ◽  
Author(s):  
Amel F. Boudjabi ◽  
Ahmed Bellaouar ◽  
Mohammed Lachi ◽  
Nadim El Wakil
Keyword(s):  
Heat Transfer ◽  
Continuous Casting ◽  
Slag Layer ◽  
Bath Surface ◽  
Isothermal Fluid ◽  
Continuous Casting Tundish ◽  
Control Devices ◽  
Composition Operations ◽  
Metal Jet

Temperature variation phenomena observed inside the metallurgical tundish in the continuous casting is principally due to several factors, high temperature of the ladle metal jet, important thermal losses, heat transfer between molten steel and tundish walls and more still, in contact with the slag layer at bath surface and if necessary cooling or warming in refining composition operations. A numerical simulation using the CFD code “Fluent” is realised. Investigation of heat transfer—which has a great importance in the natural convection and the inclusions floating at slag surface—, is proposed. Results are presented for three arrangements of the tundish, where the interest and role of the control devices is improved.

Slag Thickness in Continuous Casting Tundish Measuring Method Based on Temperature Information

2012 ◽  
Vol 457-458 ◽  
pp. 804-809
Author(s):  
Jun Liu ◽  
Feng Yang ◽  
Jun Xie ◽  
Zheng Jun Zeng
Keyword(s):  
Continuous Casting ◽  
Slag Layer ◽  
Measuring Method ◽  
Thickness Measurement ◽  
Measuring Error ◽  
Steel Metallurgy ◽  
Continuous Casting Tundish ◽  
Steel Layer ◽  
Slag Thickness ◽  
Application Prospects

Acquiring the thickness of slag layer in continuous casting tundish accurately is beneficial to continous casting stably, and improves enterprise benefit. A new method to measure the thickness of slag layer in continuous casting tundish, based on temperature information is put forward in the papers. A measuring bar, made of Refractory Material, was inserted into the tundish to perceive the temperature. Then the thickness of slag layer may be obtained accurately by temperature interface between air layer and slag layer, and slag layer and molten steel layer. After applying to the slag layer thickness measurement in steel metallurgy field, it has a favorable application prospects because of the measuring error about less than 2.6mm.

Numerical Calculation of Fluid Flow in a Continuous Casting Tundish

2013 ◽  
Vol 774-776 ◽  
pp. 316-320
Author(s):  
Yang Li ◽  
Yan Jin ◽  
Hui Yu ◽  
Kang Yang ◽  
Fan Ai ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Fluid Flow ◽  
Numerical Calculation ◽  
Flow Field ◽  
Continuous Casting ◽  
Molten Steel ◽  
Liquid Steel ◽  
Retaining Wall ◽  
Continuous Casting Tundish ◽  
Wall Flow

Placement in the middle retaining wall package, aimed at controlling the flow of liquid steel forms, so that movement of a reasonable level remained stable, while reducing interference from turbulence and dead zones, molten steel in order to extend the average stay of removal in favor of inclusion to improve the cleanliness of molten steel. Keywords:Tundish; Retaining Wall; Flow field; Mathematical Modeling; Inclusion;Optimization setting

Thermodynamics Analysis of Non-Metallic Inclusions Formation in the Liquid Steel Flow Through Continuous Casting Tundish

2012 ◽  
Vol 57 (1) ◽  
pp. 277-282 ◽  
Author(s):  
J. Jowsa ◽  
A. Cwudziński
Keyword(s):  
Continuous Casting ◽  
Liquid Steel ◽  
Industrial Plant ◽  
Thermodynamic Evaluation ◽  
Thermodynamics Analysis ◽  
Metallic Inclusions ◽  
Calculation Results ◽  
Flow Through ◽  
Continuous Casting Tundish ◽  
Steel Flow

Thermodynamics Analysis of Non-Metallic Inclusions Formation in the Liquid Steel Flow Through Continuous Casting TundishExperiments were conducted at industrial plant to determine the free and total oxygen contents in molten steel in the tundish during continuous casting blooms of sizes 280×280 mm. On the basis of industrial experiment results a thermodynamic evaluation of non metallic inclusion formation in liquid steel was performed. Software FactSage® with thermodynamic base packages were tested and applied to calculate equilibrium formation of oxides and sulphides. The results showed the effect of oxygen contents and temperature on the formation inclusion in liquid steel. Calculation results was presented in the form of suitable characteristics which were illustrated graphically.

scholarly journals Multiphase Numerical Model of Molten Steel and Slag Behavior in the Continuous Casting Mould

2015 ◽  
Vol 60 (1) ◽  
pp. 257-262 ◽  
Author(s):  
M. Bielnicki ◽  
J. Jowsa ◽  
A. Cwudziński
Keyword(s):  
Continuous Casting ◽  
Liquid Steel ◽  
Symmetry Plane ◽  
Slag Layer ◽  
Bath Surface ◽  
Multiphase Model ◽  
Metal Bath ◽  
Ansys Fluent ◽  
Steel Slabs ◽  
Continuous Casting Mould

AbstractThe paper reports the results of numerical simulation of the flow of liquid steel with the use of a multiphase model. The facility under study was a mould designed for continuous casting of steel slabs. The geometry of the facility, along with the computational grid, was generated within the program Ansys-MeshingR. Numerical computations were performed in the programs: COMSOL Multiphysics¯ and Ansys-Fluent¯. The use of the multiphase model enabled the determination of the behavior of the liquid slag layer on the metal bath surface. From the performed computer simulations, the fields of liquid steel motion and liquid steel turbulence kinetic energy distribution in the mould's symmetry plane have been presented. Based on the values recorded at selected measurement points located on the slag surface, a diagram illustrating the variation of the slag layer position during continuous steel casting has been plotted.

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