Measurement and Modeling of Particle Radiation in Coal Flames
Journal article, 2014

This work aims at developing a methodology that can provide information of in-flame particle radiation in industrial-scale flames. The method is based on a combination of experimental and modeling work. The experiments have been performed in the high-temperature zone of a 77 kWth swirling lignite flame. Spectral radiation, total radiative intensity, gas temperature, and gas composition were measured, and the radiative intensity in the furnace was modeled with an axisymmetric cylindrical radiation model using Mie theory for the particle properties and a statistical narrow-band model for the gas properties. The in-flame particle radiation was measured with a Fourier transform infrared (FTIR) spectrometer connected to a water-cooled probe via fiber optics. In the cross-section of the flame investigated, the particles were found to be the dominating source of radiation. Apart from giving information about particle radiation and temperature, the methodology can also provide estimates of the amount of soot radiation and the maximum contribution from soot radiation compared to the total particle radiation. In the center position in the flame, the maximum contribution from soot radiation was estimated to be less than 40% of the particle radiation. As a validation of the methodology, the modeled total radiative intensity was compared to the total intensity measured with a narrow angle radiometer and the agreement in the results was good, supporting the validity of the used approach.



particle radiation


radiative heat transfer


Daniel Bäckström

Chalmers, Energy and Environment, Energy Technology

Robert Johansson

Chalmers, Energy and Environment, Energy Technology

Klas Andersson

Chalmers, Energy and Environment, Energy Technology

Filip Johnsson

Chalmers, Energy and Environment, Energy Technology

Sønnik Clausen

Technical University of Denmark (DTU)

Alexander Fateev

Technical University of Denmark (DTU)

Energy & Fuels

0887-0624 (ISSN) 1520-5029 (eISSN)

Vol. 28 3 2199-2210

Subject Categories

Energy Engineering

Areas of Advance




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