The complex gas–solid flow and particle transport behavior in a pulsed jet roasting furnace play a critical role in magnesite calcination, yet the underlying mechanisms remain insufficiently understood. In this study, a pulsed jet roasting furnace is investigated using computational fluid dynamics (CFD). A three-dimensional transient model is developed to describe the coupled behavior of gas-phase turbulence, particle motion, heat transfer, and magnesite decomposition. The reaction is modeled using an Arrhenius-type kinetic expression coupled with the local temperature field, enabling evaluation of thermal decomposition under varying flow conditions. The results show that the pulsed jet structure generates a periodically modulated flow field, enhancing gas–solid interaction and improving temperature uniformity along the furnace height. Particle trajectory and thermal history analyses indicate more stable high-temperature conditions within the main reaction zone. Model predictions are validated against pilot-scale experimental data, showing good agreement in temperature profiles and overall decomposition degree. These findings provide mechanistic insights into gas–solid flow organization and support the design and optimization of magnesite calcination furnaces.
Gong et al. (Mon,) studied this question.