Precalciner performance is crucial to the production rate and lifespan of cement kiln systems. For this work, the gas-solid flow and pulverized coal combustion processes of an industrial precalciner were numerically modeled to understand the flow patterns and thermal processes. Gas and meal flow rates and properties were measured on-site to determine the boundary conditions for simulations and to validate the models produced. The upward swirl of gas flow in the furnace helped to disperse the particles and extend their duration in the precalciner. The concentration distribution of O₂ and CO₂ indicated that the coal particles dispersed and combusted well. Calculations found that the outlet temperature of the precalciner was too high, reducing the thermal efficiency and potentially damaging the preheater installed just after the precalciner. The present work can be used for improving the design of industrial precalciners.