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.

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.

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.

scholarly journals Tundish Cover Flux Thickness Measurement Method and Instrumentation Based on Computer Vision in Continuous Casting Tundish

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
Meng Lu ◽  
He Qing ◽  
Xie Zhi ◽  
Yang Weimin ◽  
Ci Ying ◽  
...  
Keyword(s):  
Computer Vision ◽  
Continuous Casting ◽  
Measurement Method ◽  
Thickness Measurement ◽  
High Definition ◽  
Scale Invariant ◽  
Denoising Method ◽  
Novel Method ◽  
Continuous Casting Tundish ◽  
Scale Invariant Feature

Thickness of tundish cover flux (TCF) plays an important role in continuous casting (CC) steelmaking process. Traditional measurement method of TCF thickness is single/double wire methods, which have several problems such as personal security, easily affected by operators, and poor repeatability. To solve all these problems, in this paper, we specifically designed and built an instrumentation and presented a novel method to measure the TCF thickness. The instrumentation was composed of a measurement bar, a mechanical device, a high-definition industrial camera, a Siemens S7-200 programmable logic controller (PLC), and a computer. Our measurement method was based on the computer vision algorithms, including image denoising method, monocular range measurement method, scale invariant feature transform (SIFT), and image gray gradient detection method. Using the present instrumentation and method, images in the CC tundish can be collected by camera and transferred to computer to do imaging processing. Experiments showed that our instrumentation and method worked well at scene of steel plants, can accurately measure the thickness of TCF, and overcome the disadvantages of traditional measurement methods, or even replace the traditional ones.

Mechanism of fluid flow in a continuous casting tundish with different turbo-stoppers

2001 ◽  
Vol 72 (11-12) ◽  
pp. 466-476 ◽  
Author(s):  
Hans-Jürgen Odenthal ◽  
Ralf Bölling ◽  
Herbert Pfeifer ◽  
Jörg-Friedrich Holzhauser ◽  
Franz-Josef Wahlers
Keyword(s):  
Fluid Flow ◽  
Continuous Casting ◽  
Continuous Casting Tundish

Non-cooperative maritime target position and velocity measuring method based on monocular trajectory intersection for video satellite

2017 ◽  
Vol 233 (1) ◽  
pp. 44-56 ◽  
Author(s):  
Shengyi Chen ◽  
Haibo Liu ◽  
Xiaochun Liu ◽  
Qifeng Yu
Keyword(s):  
Target Position ◽  
Measuring Method ◽  
Observation Time ◽  
Measuring Error ◽  
Target Movement ◽  
Practical Applications ◽  
High Measurement ◽  
Velocity Measuring ◽  
Elevation Model ◽  
Intersection Method

This paper presents a passive measuring method based on monocular trajectory intersection, aimed at realizing the position and velocity measurement of a non-cooperative maritime target for video satellite. Due to the fact that the target’s moving range is relatively small in comparison to that of the satellite during the observation time, a large measuring error results when directly using the monocular trajectory intersection method for 3D motion measurement. Therefore, the dynamic sea surface elevation model is employed to increase the maritime target movement constraints, which simplifies the 3D spatial motion of the target to 2D surface motion. By combining the surface constraint and monocular trajectory intersection method, measurement robustness for a non-cooperative maritime target can be greatly improved. Furthermore, a line-surface intersection method is proposed to obtain the initial solution for motion parameters, which increases the nonlinear optimization efficiency. Simulation experiments are conducted to analyze the effect of different error factors on position and velocity accuracy. The results indicate that the proposed method achieves high measurement accuracy and is feasible in practical applications for video satellite.

scholarly journals Fluid Flow in A Four-strand Bloom Continuous Casting Tundish with Different Flow Modifiers

2007 ◽  
Vol 47 (1) ◽  
pp. 88-94 ◽  
Author(s):  
Liangcai Zhong ◽  
Baokuang Li ◽  
Yingxiong Zhu ◽  
Rengui Wang ◽  
Wenzhong Wang ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Continuous Casting ◽  
Continuous Casting Tundish
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