Energy savings and productivity increases with computers — A case study of the steel ingot handling process

Lu, Yunlong; Williams, Theodore J.

doi:10.1016/0166-3615(83)90049-0

Cited by 14 publications

(1 citation statement)

References 4 publications

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“…In these papers it is usually assumed that the heat transfer is unsteady and one-dimensional. Lu and Williams, 6 Cook et al ' and Wick,8 among others, have numerically studied the ingot handling process by first assuming the ingot to be cylindrical, and the heat transfer one-dimensional. This approximation is acceptable for modelling the reheating process.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of the heat transfer in and around a steel bar during hot rolling

Visser

Mathews

1988

Commun. appl. numer. methods

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By modelling the heat transfer in and around a hot-rolled steel bar, the temperature distribution in the bar can be predicted at any stage of the hot rolling process. Knowledge of these temperatures is useful when the process is to be optimized. This paper presents a finite difference simulation of the heat transfer and resulting temperature distribution. The numerical procedure accounts for thermal radiation from the bar, convective heat transfer to the atmosphere and cooling water, and conduction between the moving bar and the mill rolls and manipulators. Measured values for convective heat transfer coefficients are used at the boundaries. The following effects are also accounted for in the procedure: deformation of the bar during rolling, tilting the bar between passes through a mill, cropping the bar and contraction resulting from heat losses. Predicted and measured temperatures correlate favourably.

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Section: Introductionmentioning

confidence: 99%

Numerical modelling of the heat transfer in and around a steel bar during hot rolling

Visser

Mathews

1988

Commun. appl. numer. methods

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Numerical investigation of a method to reduce the reheating time of steel bars

Visser

Walt

1994

Commun. Numer. Meth. Engng.

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SUMMARYReduction of reheating time saves on energy input and increases the production rate in the steel-making process. Reductions can be achieved by allowing the centre temperature of a steel bar to be lower than the surface temperature by a small margin, before starting with the hot rolling process. This can only be done if the temperature difference does not adversely affect the quality of the final product or the rolling equipment. The paper presents numerical simulations to investigate the savings that can be obtained for various temperature differences between surface and centre temperatures to evaluate the feasibility of the concept. The results presented include the cross-sectional temperature distribution in a typical steel bar during reheating at hourly intervals as well as the effect of various differences between centre and surface temperatures on reheating time. The reheating time predicted for various steel bar sizes as well as for various differences between surface and centre temperatures are then compared against measured reheating times. To indicate the practical applicability of the concept to the hot rolling process the detailed temperature distribution in a typical steel bar, with an initial temperature difference between the surface and centre of the bar, was simulated numerically. This was compared to a similar simulation for a well soaked steel bar for which experimental measurements are also available. The numerical method used to obtain the simulations is also presented. Boundary conditions account for radiation, convection and conduction inside the steel bar. It is concluded that the concept of allowing differences between surface and centre temperatures of a steel bar during reheating holds great potential for energy savings in the steel-making process.

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The development of optimal ingot heating patterns in soaking pits

Tie-jun

1985

Computers in Industry

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Energy savings and productivity increases with computers — A case study of the steel ingot handling process

Cited by 14 publications

References 4 publications

Numerical modelling of the heat transfer in and around a steel bar during hot rolling

Numerical modelling of the heat transfer in and around a steel bar during hot rolling

Numerical investigation of a method to reduce the reheating time of steel bars

The development of optimal ingot heating patterns in soaking pits

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