关键词: 煅烧, 多孔介质, 传热, 传质, 耦合

Abstract: A mathematical model describing the coupled processes of endothermic chemical reaction, heat transfer and mass transfer in porous media was established by using the assumption of local thermal non-equilibrium, which was required when the local thermal equilibrium between the fluid and solid phases broke down.The Ergun-Forchheimer-Brinkman model was used to represent the fluid flow within the porous media.An alternate dimension implicit method was adopted to solve this model numerically and the mathematical model was validated by comparing the numerical results with the experimental data in literature.The gas temperature fields, porous matrix temperature fields, the concentration fields of product gas as well as the distribution of the fractional conversion of solid reactant were obtained by changing various parameters.The results show that, the temperature difference between gas and porous matrix can not be neglected.The velocity in porous media at entrance,gas temperature at entrance and particle size were the important parameters which influenced significantly the reactive characteristics of the porous system.The results are useful in the conceptual design and operation of fixed reactor involving intense endothermic reactions.

Key words: 煅烧, 多孔介质, 传热, 传质, 耦合