LAUSR

Ultrafine rare-earth oxides (REOs) are widely applied in all fields of daily life, but the conventional preparation methods are limited by a long procedure, low efficiency and severe environmental pollution. Our team has independently developed a jet pyrolysis reactor for the preparation of ultrafine cerium oxides, and this process has theoretical significance and practical application values. In this study, gas–solid pyrolysis reactions inside the jet-flow pyrolysis reactor were numerically simulated. We performed a coupling computation of the combustion, phase transformation and gas–solid reaction on Fluent and user-defined functions. We characterized the flows of different phases as well as the compositions and distributive laws of the reactants/products in the reactor. The gas-phase inlet velocity and dynamic pressure/additional pressure were related by a quadratic function. The velocity at the throat inlet changed the most, and the outlet velocity was very stable. The CeO2 concentrations were obviously stratified. This study enriches theories of jet-flow pyrolysis and theoretically underlies the optimization and popularization of self-developed pyrolysis reactors.