Influence of hopper angle on pellet flow and distribution in gas-based shaft furnace during charging process
Particle segregation of pellets leaving the hopper affects their distribution in the gas-based shaft furnace,which could also affect the utilization of reducing gas if not properly distributed.In this study,the three-dimensional models of hopper with an inclination angle of 20°～70°,guide pipe,chute and gas-based shaft furnace were established.Based on the discrete element method,the flow and distribution of pellet from hopper to gas-based shaft furnace were studied.The results show that particles appear with mass flow in the hopper at 20°～25°,mixed flow in the hopper at 30°～55°and funnel flow in the hopper at 60°～70° during the discharging process.The funnel flow promotes the formation of a fast-flowing central channel in the material layer,and large particles leave the hopper to enter the furnace earlier and accumulate in the drop point area,resulting in negative segregation of large particles in the hopper and positive segregation of large particles in the drop point area in the shaft furnace.The deviation of porosity in the furnace is distributed between 0.003 83 and 0.004 68 when the hopper inclination is 20°～35°,and the deviation of porosity increases when the inclination angle increases.By changing the charge-hopper static friction coefficient,charge batch weight,and hopper radius,it is found that the hopper inclination angle is the main factor affecting the distribution process and results,and the porosity deviation still increases with the increase of the hopper inclination angle.
discrete element methodgas-based shaft furnacehopperparticle flowburden distribution
万方数据
维普
