2025 Volume 104 Issue 4 Pages 35-53
Gasification is one of the important technologies using coal and other solid feedstocks for high efficiencypower generation and chemical production. The gasification reaction consists of primary pyrolysis, gas phase, and char gasification reactions. The authors constructed models corresponding to the three reactions to describe several phenomena in actual gasifiers. Extended Chemical Percolation Devolatilization (Ex-CPD) model and Main Reaction path Extracted (MRE) model were constructed to predict soot yield in gasification. Partially Shared active sites Langmuir Hinshelwood (PS-LH) model was constructed to describe char gasification in the co-existence of CO2 and H2O. In this study, after evaluating the consistency between the char gasification model and experimental results, the effectiveness of the three models was evaluated by numerical simulation. Firstly, a correlation analysis revealed the correlations between the parameters of the char gasification reaction model including the PS-LH model and coal properties. Secondly, the PS-LH model was compared with conventional models and found to be the most accurate to describe the experimental results. Finally, 1D numerical simulations of the reductor part of the two-stage entrained-flow gasifier were performed to evaluate the effect of using the three models in combination. These investigations clarified the significance of using the models suited to the phenomenon.
