A numerical study on the wall erosion impact and gas-particle hydrodynamics in circulating fluidized bed riser

In this paper, the gas-particle hydrodynamics as well as the wall erosion impact in CFB risers were investigated with Euler-Lagrange based computational fluid dynamics (CFD) by using a commercial software BARRACUDA. The numerical model was validated by comparing the simulation results with experimental data and acceptable agreements were achieved. The detail hydrodynamic was studied by analyzing the particle volume fraction, pressure distribution as well as particle residence time. The findings indicate that particles with C shape riser can flow uniformly with shorter residence time, whereas, particles tend to be reflected backward with T shape riser. The backward motion is due to the downward flow and the dissolution of particle meso-scale structures. Moreover, the impact of particles on wall erosion is higher with T shape riser. The present numerical study implied that the design of riser exit has a significant effect on the hydrodynamics and particle circulation in CFB systems.