The Study Of Dust Hoppers Discharging Process Of Particle Motion

Discharge grey system in deduster is very important for the efficiency of dust collection inthe whole dust removal. From reentrainment lead to air leakage or ash position too high in ashhopper, these can reduce the efficiency of dust collection and influence the dust cleaning effect.According to study the unsteady particle flow of the discharging process in ash hopper, useviscosity model of particle flow and CFD software.The paper studies the influence of the particle flow by particle viscosity. To the same dipangle of ash hopper, respectively study the particle flow of viscosity of0.01kg/m·s and0.3kg/m·s. The result shows that: the smaller of the particle viscosity, the slower of the particleflow, and the smaller of the particle mass flow rate, the discharging time is longer.The paper studies the influence of the particle flow by ash hopper dip angle. To the sameviscosity of particle, respectively study the particle flow of65°and55°dip angle ash hopper.The result shows that: the bigger of ash hopper dip angle, the faster of the particle flow, and thehigher of the particle mass flow rate, the discharging time is shorter.The results also show that: according to the discharging velocity of particle, the influence ofash hopper dip angle is obvious than the influence of particle viscosity. The velocity of particleflow is the fastest in the centre of the ash hopper. In the early of discharging, the particle surfacehas a certain extent concave, but not very evident; but in the late time of discharging, the particlesurface has an evident concave.The bigger viscosity of the particle, the obviouser of the surfaceconcave, and the particle accumulate in the near-wall place. In the discharging process, there isthe phenomenon of reentrainment of dust.