针对微波辅助加热情况下气固热耦合及气固反应应用，设计了一种利用微波加热多孔固体介质(碳化硅)来间接加热气体的气固耦合模型，并利用有限元仿真软件进行建模。通过对电磁场、流体传热场、 自由和多孔介质这3个物理场的耦合仿真，验证了此气固耦合模型的准确性和可行性；分析了该模型在不同石英管半径、不同多孔介质孔隙率和不同气体流速情况下的S参数和加热情况。结果表明，当碳化硅的孔隙率 为0.5，石英管的半径为20 mm时，微波转换效率最高，微波能量利用率达到90%以上。

A gas-solid coupling model is designed, which uses microwave heating porous medium(silicon carbide) to heat gas indirectly, aiming for the application of gas-solid model coupling and gas-solid reaction under microwave assisted heating. Finite element simulation software is adopted to build the model. The accuracy and feasibility of the gas-solid coupling model are verified by coupling simulation of three physical fields: electromagnetic field, fluid heat transfer field, free and porous media. The results show that the microwave conversion efficiency is the highest when the porosity of silicon carbide is 0.5 and the radius of quartz tube is 20 mm, and the microwave energy efficiency is above 90%.