THERMAL SCIENCE

International Scientific Journal

External Links

NUMERICAL INVESTIGATION OF THE EFFECT OF THE INSULATION THICKNESS ON THE DEGREE OF NONUNIFORMITY OF THE BILLET TEMPERATURE

ABSTRACT
The degree of nonuniformity of the billet temperature subjected to the radiative heat loss to the discharge door with different insulation thicknesses is investigated in this present study. The 2-D steady-state heat conduction for the billet subjected to different heat fluxes is solved by being transformed into a dimensionless form. The Gauss-Seidel iterative method for a finite volume discretization of the billet is employed to obtain the temperature distribution of the billet. The numerical result is validated by comparing with the field measurement data. A qualitative agreement between these two is observed. An effect of different insulation thicknesses on the heat-transfer characteristics and the degree of nonuniformity of the billet temperature is examined. In case of the replaced 50-mm thick insulation of the discharge door, the radiative heat loss to the discharge door is reduced by 49% with the replaced insulation, and the degree of nonuniformity of the billet temperature is decreased by 23°C.
KEYWORDS
PAPER SUBMITTED: 2012-04-19
PAPER REVISED: 2014-06-11
PAPER ACCEPTED: 2014-07-18
PUBLISHED ONLINE: 2014-08-03
DOI REFERENCE: https://doi.org/10.2298/TSCI120419089S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE 3, PAGES [1097 - 1105]
REFERENCES
  1. Lindholm, D., Leden, B., A Finite Element Method for Solution of the Three-Dimensional Time-Dependent Heat Conduction Equation with Application for Heating of Steels in Reheating Furnaces, Numerical Heat Transfer Part A: Applications, 35 (1999), 2, pp. 155-172
  2. Chen, W. H., et al., Analysis on Energy Consumption and Performance of Reheating Furnaces in a Hot Strip Mill, International Communication in Heat and Mass Transfer, 32 (2005), 5, pp. 695-706
  3. Han, S. H., et al., Transient Radiative Heating Characteristics of Slabs in a Walking Beam Type Reheating Furnace, International Journal of Heat and Mass Transfer, 52 (2009), 3-4, pp. 1005-1011
  4. Kim, M. Y., A Heat Transfer Model for the Analysis of Transient Heating of the Slab in a Directed-Fired Walking Beam Type Reheating Furnace, International Journal of Heat and Mass Transfer, 50 (2007), 19-20, pp. 3740-3748
  5. Trinks, W, et al., Industrial Furnaces, sixth edition, John Wiley and Sons Inc., New York, USA, 2004, pp 189-192
  6. Wart, J., Probert, S. D., Reduction of Energy Losses Associated with Stock Support Structures in Slab-Reheating Furnaces, Applied Energy, 1 (1975), 3, pp. 223-236
  7. Lyman, B., Energy Saving in Reheating Steel Billets in Improved Furnace Facility, Industrial Heating, 49 (1982), 4, pp. 20-21
  8. Vereshchagin, A. V., et al., Reducing Heat Loss in Pusher-Type Continuous Reheating Furnace, Metallurgist, 51 (2007), 9-10, pp. 505-506
  9. Si, M., Thompson, S., Calder, K., Energy Efficiency Assessment by Process Heating Assessment and Survey Tool (PHAST) and Feasibility Analysis of Waste Heat Recovery in the Reheat Furnace at a Steel Company, Renewable and Sustainable Energy Reviews, 15 (2011), pp. 2904- 2908
  10. Jang, Y. J., Kim, S. W., An Estimation of a Billet Temperature during Reheating Furnace Operation, International Journal of Control, Automation, and Systems, 5 (2007), 1, pp. 43-50
  11. Guo-jun, L. et al., The Simplified Method to Calculate Two-dimensional Heat Conduction Equations of Heating Slab, Applied Mechanics and Materials, 79 (2011), pp. 105-110.
  12. Jaklic, A., et al., Online Simulation Model of the Slab-Reheating Process in a Pusher-Type Furnace, Applied Thermal Engineering, 27 (2007), 5-6, pp. 1105-1114
  13. Hottel, H. C., Sarofim, A. F., Radiative Transfer, McGraw-Hill Inc., New York, USA, 1967, pp. 299-301
  14. Ehlert, J. R., Smith, T. F., View Factors for Perpendicular and Parallel Rectangular Plates, Journal of Thermophysics and Heat Transfer, 7 (1993), 1, pp. 173-175
  15. Incropera, F. P, DeWitt, D. P., Fundamentals of Heat and Mass Transfer, 5th edition, John Wiley & Sons, New York, USA, 2002, pp. 198-201
  16. Patankar, S. V., Numerical Heat Transfer and Fluid Flow, Taylor & Francis, USA, 1980, pp. 47-48
  17. Huang, M. J., et al., A Coupled Numerical Study of Slab Temperature and Gas Temperature in the Walking-Beam-Type Slab Reheating Furnace, Numerical Heat Transfer, Part A, 54 (2008), 6, pp. 625-646
  18. Chen, W. L., et al., Experimental and Theoretical Investigation of Surface Temperature Non-Uniformity of Spray Cooling, Energy, 36 (2011), 1, pp. 249-254
  19. Dutta, S., Hot Rolling Practice - An Attempted Recollection, www.steel-insdag.org

© 2020 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence