摘要
The effects of liquid viscosities, solid circulating rates, liquid and gas velocities and phase holdups on the axial dispersion coefficient, Dax, were investigated in a gas-liquid-solid circulating fluidized bed (GLSCFB).Liquid viscosity promotes the axial liquid backmixing when solid particles and gas bubbles are present. Increases in gas velocities and solid circulating rates lead to higher Dax. The effects of liquid velocity on Dax are associated with liquid viscosity. Compared with conventional expanded beds, the GLSCFBs hold less axial liquid dispersion,approaching ideal plug-flow reactors.
The effects of liquid viscosities, solid circulating rates, liquid and gasvelocities and phase holdups on the axial dispersion coefficient, D_(ax), were investigated in agas-liquid-solid circulating fluidized bed (GLSCFB). Liquid viscosity promotes the axial liquidbackmixing when solid particles and gas bubbles are present. Increases in gas velocities and solidcirculating rates lead to higher D_(ax). The effects of liquid velocity on D_(ax) are associatedwith liquid viscosity. Compared with conventional expanded beds, the GLSCFBs hold less axial liquiddispersion, approaching ideal plug-flow reactors.
