Particle-scale study of coal-direct chemical looping combustion (CLC)

The hydrodynamic and thermochemical characteristics in the coal-direct chemical looping combustion (CLC) process are studied by a self-developed computational fluid dynamics - discrete element method (CFD-DEM) approach featuring particle-scale simulations of collisions, heat mass transfer, drying process, coal pyrolysis, gasification, heterogeneous reactions between gas species oxygen carriers. A polydisperse drag model is adopted to accurately calculate gas-solid interactions. After comprehensive validations, flow pattern, pressure drop, products composition, particle temperature, efficiency, solid residence time (SRT) qualitatively quantitatively analyzed. results show that increasing feeding rate slightly improves temperature particles accelerates release moisture particles. Finer carriers promote conversion intermediate into CO 2 H O, therefore improving efficiency CLC process. SRT distribution with an early peak long tail profoundly revealed under different operating parameters. dual-side arrangement remarkably uniformity system. • reactive CFD-DEM developed for unit. proposed validated experimental data. underlying mechanism system explored at particle-scale.