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The blast furnace ironmaking plays an important role in the steel industry. In this work, gas flow, heat transfer and chemical reactions in a blast furnace shaft region under different charging conditions are integrated into a Computational Fluid Dynamics (CFD) model. The model simulates the burden distribution, gas distribution, gas-solid reductions, and multi-phase heat transfer. The cohesive zone (CZ) shape is calculated through iteration procedures which continue until convergence. Major chemical reactions that occur in the blast furnace are considered in a gas-solid reaction sub-model. The results of CFD model simulation are evaluated with experimental and operational data of United States (US) Steel blast furnaces. The results showed that below the isotherm 600 °C and above 1200 °C, the gas composition is irrelevant to the burden temperature. However, the gas composition held approximately the same relationship with the burden temperature between 600 °C and 1200 °C regardless of the radial location. One expectation is the region in the center of the center working furnace where the gas utilization is very low. The length of the thermal reserve zone is shortened in the region of low gas utilization. The step-wise reduction procedure of the iron ore, i.e Fe2O3 --> Fe3O4 --> FeO --> Fe, is evident in the blast furnace shaft.