Modelling, dynamic simulation and analysis of mass transport with adsorption-reaction in three-phase reactors.

摘要

Over the past two or three decades, considerable amount of research efforts has been undertaken on characterizing the three-phase reactor systems. However, due to the complex mass transport and adsorption-reaction phenomena occurring within these reactor systems, development of suitable mathematical models which incorporate such important phenomena is still a major challenge to researchers in the field.; In this research, several aspects of the three-phase reactor systems are studied. Specifically, modelling and experiments of gas-liquid mass transfer in a draft-tube bubble column and a draft-tube three-phase fluidized bed are examined. The dynamic simulation and parametric sensitivity analysis of an agitated three-phase slurry reactor are investigated based on a dynamic model reported in the literature. The model describes the dynamic variation of reactant concentrations considering both the mass transport and adsorption-reaction phenomena. In addition, a dynamic model is developed to describe the start-up of an anaerobic three-phase fluidized bed bioreactor for phenol degradation with or without glucose. The model takes into account various factors including biokinetics with cell acclimation, diffusion-bioreaction within biofilm, diffusion-adsorption within activated carbon particles, gas-liquid and liquid-solid mass transfer, moving boundary associated with biofilm growth, bed expansion, and phase holdups variation. Simulation results are compared with experimental data to verify the proposed dynamic model.; In summary, the work represents systematic efforts on modelling, dynamic simulation and analysis of mass transport with adsorption-reaction for a model system of three-phase reactors. The results are pertinent to on-line operation and control of three-phase reactors.