Modeling Analysis of Gas–Solid Reactor Performance in Gasifiers Based on Diverse Mechanisms

To effectively cope with the impact of coal quality changes on the operation of coal gasification units and ensure the stable and efficient operation of coal gasification units, an entrained-flow gasifier was modeled and simulated in this paper. Equilibrium reaction models, reaction kinetics models, and reaction zoning models based on various mechanisms were employed for the modeling. Simulation results for Xinjiang Zhundong Hongshaquan coal with different coal qualities were compared with the actual operation data of the plant using the root mean square deviation (RMSD) method. The deviations of the equilibrium reaction model, reaction kinetics model, and reaction zoning model were 1.14% and 1.09%, 0.65% and 0.61%, and 0.44% and 0.368%, respectively. The comparison results show that all three models can accurately simulate and predict the gasification process of Junggar coal when the coal quality changes. Then, the established models were used to study the influence of the changes in the main parameters of the gasification unit, such as coal slurry concentration and oxygen–coal ratio, on coal gasification. The results show that an increase in coal slurry concentration has a positive influence on the effective gas. The optimal oxygen–coal ratio in the coal studied in this paper is approximately 0.45, which provides strong theoretical support for the subsequent optimization of the coal gasification process and actual production operation.