Dynamic pore analysis of shock tube, grid reactor and entrained flow reactor experiments on char combustion and gasification

摘要

Combustion and gasification reactivity measurements of a char of bituminous coal in a broad range of particle temperatures (1500-3000K.) are performed using a shock tube and a grid reactor facility. The partial pressure of a reactant was varied between 0-10 bar for the shock tube and 0-25 bar for the grid reactor. Oxygen, carbon dioxide and water vapour are used as reactants in the reactions of combustion and gasification. A computational model is developed to describe the reactions on and the dynamic growth of the internal and the external surface. The model was used to gain understanding of the interaction of chemical and leactant transport processes. Furthermore it is used to correlate the data acquired in the shock tube experiments with experimental data acquired with the entrained flow reactor of the International Flame Research Foundation (IFRF). The computational model succeeds to explain the change of the char reactivity as a function of time and the burnout without the use of non-physical fit parameters.