Study on active site extending model of coal char catalytic gasification
煤焦催化气化活性位扩展模型的研究

Based on the widely accepted catalysis mechanism and the reasonable assumptions, a new kinetics model, active site extending model was developed to describe the catalytic coal char gasification rate more properly. The model was validated with the experimental results of CO2 catalytic gasification of Shenfu coal char at various temperatures by using KC1 and K-Ni compound catalysts, and the model parameters for Shenfu coal char gasification were obtained. The kinetic behaviour and catalytic mechanism are well explained by active site extencling model. The maximum error between the simulated and experimental results is about 10%. It is also revealed that the catalysts can effectively improve the gasification rate and reduce the gasification temperature by increasing the active surface area and sites. A slight disagreement between the simulated and experimental results can be attributed to the mass transfer resistance during the initial reaction stage.