The blast furnaceBlast furnace process is the mainstream method for producing hot iron metal. In the lower part of the blast furnaceBlast furnace, the lateral injection of reducing gas into the coke particle bed creates a raceway. Since the shape and permeability of the raceway significantly affect the gas transport phenomenaTransport phenomena inside the blast furnaceBlast furnace, a transient computational mechanics model that encompasses momentum, heat, and solute transfer is needed to predict the shape of the raceway, which is difficult to measure directly. This study focuses on developing coupled computational fluid dynamicsComputational Fluid Dynamics (CFD)-discrete element method (CFDComputational Fluid Dynamics (CFD)-DEM) technology. This approach not only predicts the effects of injection composition, injection parameters, and heterogeneous chemical reaction kineticsReaction kinetics on the raceway shape. Additionally, the emerging CFDComputational Fluid Dynamics (CFD)-DEM coupled method allows forecasting complex mechanical behaviors such as deformation of the tuyere due to coke particle impact, polydisperse particle packing dynamics, and the hysteresis phenomenon of the raceway.