Particle composition and size distribution in coal flames - The influence on radiative heat transfer
Journal article, 2015

Radiative heat transfer in a 77kWth swirling lignite flame has been studied. The aim is to characterize different particle types present in a coal flame and to determine their influence on the radiative heat transfer. The study combines extractive particle measurements, radiative intensity measurements and detailed radiation modelling. The size distribution of the extracted particles was measured with a low pressure impactor and some of the size fractions were analysed with SEM-EDX. The measured total radiative intensity is compared with the modelled intensity based on the particle measurements in the same cross-section of the flame. The particle properties were calculated with Mie theory and the gas properties with a statistical narrow-band model. The results show that the contribution of coal/char particles dominates the radiative heat transfer in the investigated cross-section of the flame. The methodology applied in this work shows promising results for characterization of particle radiation in flames of practical size.

Soot

Radiative heat transfer

Coal

Flame

Particle radiation

Radiative intensity

Author

Daniel Bäckström

Chalmers, Energy and Environment, Energy Technology

Dan Gall

University of Gothenburg

M. Pushp

SP Sveriges Tekniska Forskningsinstitut AB

Robert Johansson

Chalmers, Energy and Environment, Energy Technology

Klas Andersson

Chalmers, Energy and Environment, Energy Technology

Jan B. C. Pettersson

University of Gothenburg

Experimental Thermal and Fluid Science

0894-1777 (ISSN)

Vol. 64 70-80

Subject Categories

Energy Engineering

Areas of Advance

Energy

DOI

10.1016/j.expthermflusci.2015.02.010

More information

Latest update

9/6/2018 1