Simulation and application of dynamic heat transfer model for improvement of continuous casting process

C., J.; Xie, Zhi; Ci, Ying; Jia, G.

doi:10.1179/174328408x339107

Cited by 12 publications

(9 citation statements)

References 10 publications

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“…The governing equation describing the internal temperature distribution of the solid is the heat conduction equation. The general form of 3D unsteady heat conduction differential equation in the rectangular coordinate system is as follows

ρ c \frac{\partial t}{\partial τ} = \frac{\partial}{\partial x} (λ \frac{\partial t}{\partial x}) + \frac{\partial}{\partial y} (λ \frac{\partial t}{\partial y}) + \frac{\partial}{\partial z} (λ \frac{\partial t}{\partial z}) + ϕ

where, t , ρ , c , τ, and ϕ are infinitesimal body temperature, density, specific heat, time, and per unit time per unit volume of the heat which is generated by the internal heat source, respectively.…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical Simulation of Heat Transfer between Roll and Slab under Dry Secondary Cooling in Ultrathick Slab Continuous Casting

Liu

Long

et al. 2019

steel research int.

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A 3D model of heat transfer between the circular‐distributed water channel roll (CDWCR) and slab during ultrathick slab continuous casting process is established, considering the structure of water channels inside CDWCR and rotating contact between the roll and slab. The results show that the contribution of conduction heat transfer in the heating process of the roll is greater than that of radiation heat transfer, and maximum surface temperature of the roll is 460 K, located at the place where it is right out of contact with the slab, and the change of internal temperature of the roll lags behind the change of surface temperature. The temperature decreases gradually from the outside to the inside in the radial direction. The temperature of the CDWCR inside the circle of cooling water channels is no more than 325 K. The yield strength of CDWCR is analyzed, showing that the strength of the roll meets the requirements of using it in the process. In addition, the orthogonal method is used to analyze the influence factors on CDWCR temperature. The results indicate that the orders of factors affecting more are the contact angle, the slab temperature, the casting speed, and the inlet speed of cooling water.

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ρ c \frac{\partial t}{\partial τ} = \frac{\partial}{\partial x} (λ \frac{\partial t}{\partial x}) + \frac{\partial}{\partial y} (λ \frac{\partial t}{\partial y}) + \frac{\partial}{\partial z} (λ \frac{\partial t}{\partial z}) + ϕ

Section: Mathematical Modelmentioning

confidence: 99%

Numerical Simulation of Heat Transfer between Roll and Slab under Dry Secondary Cooling in Ultrathick Slab Continuous Casting

Liu

Long

et al. 2019

steel research int.

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“…This model is used for controlling the casting process and improving the existing secondary cooling system. The solidification with phase change and the temperature profile inside the billet can be described by the twodimensional heat conduction equation 10,11 rc…”

Section: Real Time Heat Transfer Model and Control Strategymentioning

confidence: 99%

Design and application of dynamic secondary cooling control based on real time heat transfer model for continuous casting

Chen

2013

International Journal of Cast Metals Research

Self Cite

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The control of secondary cooling is extremely important for the quality of billet in the continuous casting. In order to minimise the variation in surface temperature and excessive reheating of billet, which have a considerable influence on the formation of cracks and other defects, a real time heat transfer model that can be used for simulation of varying casting operations was developed. In order to verify the dynamic performance of this model, a charge coupled device temperature measurement system that can eliminate the impact of the scales was presented. The actual shell thickness profile and billet temperature were calculated in real time by this model online and were taken into account to feedback control the casting process based on the desired target cooling pattern to improve the existing cooling system. The dynamic control system based on this model was developed and implemented on some caster, and the billet quality was obviously improved.

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“…Subsequently, the strand is pulled into the secondary cooling zones and cooled by water spray or air-mist spray in order to solidify completely. The strand quality, particularly regarding surface and inner cracks, is closely related to the turbulent flow and the heat transfer during the solidification involved in a CC process [1][2][3][4][5]. This is particularly true given that, in the slab CC process, the solidification profile of the slab transverse section-which closely relates to the integrated distribution of cooling water in secondary cooling zones-is not entirely uniform [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A Combined Hybrid 3-D/2-D Model for Flow and Solidification Prediction during Slab Continuous Casting

Long

Chen

et al. 2018

Metals

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A combined hybrid 3-D/2-D simulation model was developed to investigate the flow and solidification phenomena in turbulent flow and laminar flow regions during slab continuous casting (CC). The 3-D coupling model and 2-D slicing model were applied to the turbulent flow and laminar flow regions, respectively. In the simulation model, the uneven distribution of cooling water in the width direction of the strand was taken into account according to the nozzle collocation of secondary cooling zones. The results from the 3-D turbulent flow region show that the impact effect of the molten steel jet on the formation of a solidification shell is significant. The impact point is 457 mm below the meniscus, and the plug flow is formed 2442 mm below the meniscus. In the laminar flow region, grid independence tests indicate that the grids with a cell size of 10 × 10 mm 2 are sufficient in simulations to attain the precise temperature distribution and solidification profile. The liquid core of the strand is not entirely uniform, and the solidification profile agrees well with the integrated distribution of cooling water in secondary cooling zones. The final solidification points are at a position of 400-500 mm in the width direction and are 17.66 m away from the meniscus.

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Simulation and application of dynamic heat transfer model for improvement of continuous casting process

Cited by 12 publications

References 10 publications

Numerical Simulation of Heat Transfer between Roll and Slab under Dry Secondary Cooling in Ultrathick Slab Continuous Casting

Numerical Simulation of Heat Transfer between Roll and Slab under Dry Secondary Cooling in Ultrathick Slab Continuous Casting

Design and application of dynamic secondary cooling control based on real time heat transfer model for continuous casting

A Combined Hybrid 3-D/2-D Model for Flow and Solidification Prediction during Slab Continuous Casting

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