The main aim of this work is development of fragmentation model based on calculations of the thermal stresses inside pulverized coal particles and its implementation in ANSYS FLUENT combustion model using User Defined Functions (UDFs). Fragmentation model calculates induced thermal stresses for different particle residence times taking into account particles of different radius. Calculated unsteady stress field is used to obtain principal stresses values. Model further assumes that particle fragmentation occurs when major principal stress exceeds particle uniaxial tensile strength.
Numerical model accuracy was checked comparing numerically calculated temperatures with temperature values measured inside novel semi industrial scale experimental plasma burner test facility.
Key words: Serbian lignite, low temperature thermal plasma, coal particle fragmentation numerical modeling, experimental validation.
Rastko Jovanović*, Dejan Cvetinović, Predrag Stefanović, Predrag Škobalj, Zoran Marković
University of Belgrade, VINCA Institute of Nuclear Sciences, Laboratory for Thermal Engineering and Energy, P.O.Box 522, 11001 Belgrade, Serbia
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