| Steel slag is an indispensable by-product of steelmaking.As a solid waste,if it can not be treated in time,it will cause serious waste of resources and environmental pollution.The converter steel slag gasification dephosphorization technology is a new technology for removing phosphorus from steel slag and realizing material energy circulation,which can maximize the utilization of hot steel slag resources.The bottom blowing and dusting methods of the converter replace the furnace mouth feeding to improve the dephosphorization efficiency and provide a theoretical basis for the industrialization of gasification and dephosphorization.In this paper,the influencing factors of the slag flow field under the bottom blowing gas condition and the influencing factors of the dephosphorization powder distribution in the slag under the bottom blowing powder condition are studied.The simulation results show that the number of nozzles is the key factor affecting the proportion of the dead zone of the molten pool and the effective blowing time.Increasing the number of nozzles expands the coverage area of the circulation zone in the molten pool,thereby increasing the total turbulent kinetic energy in the molten pool.In a certain nozzle flow range,the circulation area formed by a single nozzle and the effective time to form a circulation change little with the increase of the flow rate,the flow rate increases,the flow velocity and the turbulent energy of the circulation region are enhanced,and the transmission of energy,momentum and mass in the circulation region is enhanced.Increasing the energy loss and turbulence intensity during collisions has little effect on the reduction of the dead zone ratio,but excessive flow is likely to cause excessive energy loss through the flow.The eccentric bottom blowing has little effect on the flow field in the shallow and wide molten pool.As the depth of the molten pool increases,the inverted cone-shaped region of the two-phase region is enlarged,and the conversion rate of the turbulent energy is increased.The flow field velocity gradient of the molten pool is small,and the proportion of the dead zone is small,which is favorable for mixing in the molten pool.The increase in viscosity does not affect the total equilibrium turbulent kinetic energy in the molten pool,but only affects the rate of turbulent energy conversion.The higher the viscosity,the longer the kinetic energy can reach equilibrium.The simulation of dusting simulation shows that the particles have follow-up property,and the smaller the particle size,the stronger the follow-up property.The particle distribution in the molten pool is basically located in the circulation field of the molten pool.There is no particle distribution in the dead zone of the flow field,and the particle distribution is mainly melted.The distribution of the flow field in the pool.The movement of the particles with the bubbles can only be brought into contact with the walls of the bubbles and released into the slag when the direction of movement of the bubbles and particles is different.Increasing the ratio of powder to gas does not affect the distribution of particles,but it can increase the distribution of particles in the circulation region and increase the concentration of particles.Increase a particle size will inhibit the strength of the flow field and affect the uniform distribution of the particles.Especially when the particles are too large,there is even a blank in the near slag surface layer.The particle size is reduced and the followability is increased,and the particle distribution at the end of the circulation is improved,but the distribution of the particles inside the circulation is reduced.If the bottom blowing flow rate is too small,the particles can not be injected into the nozzle with the gas,the flow rate increases,the powder-gas ratio does not change,and the two streams in the middle of the molten pool attract each other to form two large circulations,the lateral flow increases,the circulation flow rate increases,and the dead zone distribution decreases.The particles are evenly distributed.Figure 60;Table 5;Reference 56. |
