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本文以未反应核缩减模型为基础，建立描述气一固反应的非稳态非等压力学模型。利用实测的动力学参数和经验公式估算结果，数值求解偏微分方程组。计算结果表明，在本文讨论的条件范围内，气体压强在固态产物层内的分布比较均匀，但随反应时间变化比较明显。在多孔介质内不仅气体总量在变化，而且，气体组成也在变化。计算结果进一步揭示，在Ｈ２还原钛铁矿团过程中，限制反应速率的本质原因在于难扩散组分（水蒸汽）的扩散过程。另外，本文还考虑了各主要操作条件对气一固反应的影响规律，并探讨等压模型的近似适用条件。
Based on the unreacted nuclear reduction model, this paper establishes an unsteady-state non-isostatic pressure model that describes the gas-solid reaction. Using the measured kinetic parameters and empirical formula to estimate the results, numerical solution of partial differential equations. The calculated results show that the distribution of gas pressure in the solid product layer is more uniform within the range of the conditions discussed in this article, but the change with the reaction time is obvious. In porous media not only the total amount of gas is changing, but also the composition of the gas is changing. The calculation results further reveal that the essential reason for limiting the reaction rate during the H2 reduction of ilmenite is the diffusion process of the diffusible component (water vapor). In addition, this article also considered the main operating conditions on gas-solid reaction rule, and discusses the approximate conditions for the application of isobaric model.