Discrete-Ordinates Modelling of the Radiative Heat Transfer in a Pilot-Scale Rotary Kiln

Adrian Gunnarsson, Klas Andersson, Bradley R. Adams and Christian Fredriksson
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Adrian Gunnarsson: Division of Energy Technology, Department of Space Earth and Environment, Chalmers University of Technology, 41296 Gothenburg, Sweden
Klas Andersson: Division of Energy Technology, Department of Space Earth and Environment, Chalmers University of Technology, 41296 Gothenburg, Sweden
Bradley R. Adams: Mechanical Engineering Department, Brigham Young University, Provo, UT 84602, USA
Christian Fredriksson: LKAB, Box 952, SE-971 27 Luleå, Sweden

Energies, 2020, vol. 13, issue 9, 1-18

Abstract: This paper presents work focused on the development, evaluation and use of a 3D model for investigation of the radiative heat transfer in rotary kilns. The model applies a discrete-ordinates method to solve the radiative transfer equation considering emission, absorption and scattering of radiation by gas species and particles for cylindrical and semi-cylindrical enclosures. Modelling input data on temperature, particle distribution and gas composition in the radial, axial and angular directions are experimentally gathered in a down-scaled version of a rotary kiln. The model is tested in its capability to predict the radiative intensity and heat flux to the inner wall of the furnace and good agreement was found when compared to measurements. Including the conductive heat transfer through the furnace wall, the model also satisfactorily predicts the intermediate wall temperature. The work also includes a first study on the effect of the incident radiative heat flux to the different surfaces while adding a cold bed material. With further development of the model, it can be used to study the heat transfer in full-scale rotary kilns.

Keywords: radiative heat transfer; rotary kiln; discrete-ordinates method; experiments and modelling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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