การจำลองสามมิติของอุทกพลศาสตร์ในท่อไรเซอร์ของเครื่องปฏิกรณ์ฟลูอิไดซ์เบดแบบหมุนเวียน / ยงยุทธ ประจงการ = Three-dimensional simulation of hydrodynamics in riser of circulating fluidized bed reactor / Yongyoot Prajongkan
Gas-solid circulating fluidized bed reactors are applied in many industrial operations due to the advantages over other reactors. However, the complexity of hydrodynamics is the major challenge to improve and understand these systems. Computational fluid dynamics has been conducted to explain the complex hydrodynamics for this system. This research was conducted in three-dimensional domain to investigate the effect of parameters on the hydrodynamics and was compared the results with experimental data and previous two-dimensional domain simulation results. The simulation results showed that the effects of different gas inlet condition, gas outlet configuration, drag model, inlet granular temperature, particle density, gas inlet velocity, and solid mass flux inlet had significantly affected on the hydrodynamics in this system. The effects of specularity coefficient, restitution coefficient, frictional viscosity and viscous model had some effect. However, these parameters were necessary for adjusting the correctness of simulation results. The packing limit value, particle diameter process temperature and pressure outlet had seemingly no affected on the hydrodynamics. In addition, when comparing between three-dimensional and two-dimensional domain, it can be concluded that if the reactor has symmetrical inlets, simulations with two-dimensional domain is adequate to explain the hydrodynamics. However, if the reactor has asymmetrical inlets, simulations with three-dimensional domain will be a better solution.