Hydrodynamic Modeling on Fluidization Discharging of Particles under U-shape Valve Structure
U型阀结构下颗粒流态化排料的数学模型

A hydrodynamic model for the U-valve was proposed based on the Newton’s second law to predict solid flow rate under the fluidization discharging mode.During steady discharging,the particles descended in the moving-bed mode in the standpipe,while the particles moved upwards in the fluidization mode in the discharging chamber.A circulating fluidized bed with a U-valve was established and operated to study the performance of the U-valve using silica sand with average diameter of 81.9 μm.Experiments revealed that the solid flow rate increased linearly with the increase of superficial gas velocity.The simulated pressure drop and solid flow rate were in good agreement with those experimental data,e.g.the deviation was ±2% for pressure drop across the discharging chamber,and ±7% for the solid flow rate,demonstrating the validity of proposed algebraic model.