Abstract
Due to coal's vital role as a well-known fuel in electricity production worldwide, promising prediction of the behavior of this fuel in different combustible systems can be an effective prerequisite for augmentation of efficiency of coal-fuelled power plants. In this research, planar non-premixed combustion of moisty coal particles in counter-flow design is mathematically elucidated using an asymptotic concept. To develop a reliable model, preheat, drying, pyrolysis and oxidation processes are included. In the pyrolysis process, effects of produced char and gas are examined. In the flame region, homogeneous and heterogeneous reactions are considered. Mass and energy conservation equations are mathematically characterized to yield the temperature and mass fraction profiles of the fuel particles and oxidizer taking into account the porosity of the coal particles. A system of coupled governing equations are solved using Matlab and Mathematica software. Eventually, effects of crucial parameters including flame front temperature and position, strain rate, fuel and oxidizer mass fractions with Lewis number, and initial temperature are evaluated. Maximum temperature of the counter-flow non-premixed flame fed with coal particles with diameter of 20 µm is found to be 3097 K for fuel Lewis number of 0.3 for unity values of porosity factor and oxidizer Lewis number.
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