The Numerical Simulation Of The Enhanced Mixing Of The Bottom Blowing Pool And The Experimental Study Of The Water Model

Bottom blowing bath smelting is a key step in the copper smelting technology,as China's independent development of smelting technology according to current situation of domestic copper concentrate resources has the very good adaptability.Combining with bottom blowing bath smelting process features and design parameters,reasonable simplified model,and set the assumptions,using the basic control equation,RNG k-? epsilon turbulence model and the VOF model,establish a bottom blowing furnace 2 d plane model and three-dimensional model,finally obtain two-dimensional model of velocity field and three-dimensional mixed multiphase flow simulation results.Experimental platform and design bottom blowing furnace,filming process of gas jet flow in the molten pool,using image processing method to calculate the numerical representation Betti water model experiment process of gas jet bubble number and stability,and by comparing the numerical calculation results of the model and the experimental results verify the reliability of the numerical model.Combining with the characteristics of bottom blowing smelting blowing operation,optimization of oxygen gun configuration mode,to improve the efficiency of bottom blowing smelting,extend the life of the furnace body and the oxygen lance and so on all is of great significance.The main research content is as follows:(1)Two-dimensional mathematical model is set up,the liquid level depth of 0.3 m,1.005 m long,molten pool,oxygen gun diameter of 0.005 m the molten pool of injection gas jet speed range is around 0.2 m,when is beyond the scope of speed change will sharply reduced,thus blowing gas jet flow field in the mixing area of about 40?50 times the diameter of the oxygen lance.Comparison of water model experiment results gained from this study and mathematical model calculation results the maximum error is 5.7%,this paper established mathematical model with reliability.(2)Single oxygen gun configuration mode,set the oxygen lance Angle range of 0?14 °,single oxygen lance blowing Angle,the greater the jet quantity,the more the bubble distribution more uniform,more advantageous to the molten pool mixing and melting;Double row oxygen gun configuration mode,asymmetric injection compared with symmetrical injection way of molten pool intensive mixing effect significantly better.Double row oxygen lance configuration when oxygen gun at 14 ° inclination when the jet stability is higher.(3)because of the molten pool pressure,air bubbles into the molten pool after flowing first in the curved wall up,after the bubble formation are attached to the wall after stirring molten pool bubble from wall upward mobility,and then there will be no bubble flow along the wall.(4)three-phase hybrid gas-liquid-slag process mainly includes:molten pool surface fluctuation,matte,slag interface invagination,molten pool surface protrusions,breakthrough broken slag and slag layer,gas-matte-slag mixture of six steps.In the apparent velocity of 50 m/s and the 100 m/s injection,mixing radius of 1.2 m and 1.5 m respectively,the "new ideas" peak time of 2.12 s and 1.86 s.Oxygen gun under greater pressure on both sides of the furnace wall,easy to damage in the position.