A comparative study on different treatments of coal devolatilization for pulverized coal combustion simulation

Currently, volatile matter is generally treated as a postulate substance or a mixture of light gases and tar with given proportion in pulverized coal combustion (PCC) simulation. While whether those treatments can well characterize the PCC or not remains unknown. Here, current different coal devolatilization treatments are numerically evaluated under the configuration of laminar stagnation PCC (Xia et al., Proc. Combust. Inst. 2017). The results show that the one-step model fitted from the Chemical Percolation Devolatilization model prediction together with detailed components and mechanism could give the best prediction on the PCC characteristics. Different detailed volatile components give similar predictions on the gas and particle properties with slight difference on CO mass fraction due to their different components fractions. The simplified global mechanism can not reproduce the PCC characteristics as those of the detailed mechanisms, with earlier particle ignition, much higher gas temperature and m...