TY - JOUR
TI - The effect of fuel pyrolysis on the coal particle combustion: An analytical investigation
AU - Baghsheikhi Mostafa
AU - Rahbari Alireza
AU - Ashrafizadeh Seyed Mehdi
AU - Bidabadi Mehdi
JN - Thermal Science
PY - 2016
VL - 20
IS - 1
SP - 279
EP - 289
PT - Article
AB - The aim of this work is to analytically investigate the symmetrical  combustion of an isolated coal particle with the fuel pyrolysis effect. The  modelling concept of coal particles is similar to that of the liquid droplet  combustion but in the case of coal devolatilization, the particles do not  shrink like droplet does due to evaporation of liquid fuel. The rate of  devolatilization of volatiles can be calculated using the equation that is  similar to Arrhenius equation. This model is based on an assumption of  combined quasi-steady and transient behaviour of the process and especially  focuses on predicting the variations of temperature profile, radius of  pyrolysis and transfer number. It is revealed that the entrance of pyrolysis  effect into the governing equations leads to the reduction in the film radius  and consequently a reduction in the stand-off ratio and transfer number.