Influence Of Production Parameters On The Smelting Process In A Suspension Smelting Furnace For Powdered Iron Ore

The powdered iron sand suspension smelting technology is a kind of iron smelting process with multiple operating variables and multiple processes strongly coupled,in which the flow of gas and melt,exothermic and heat-absorbing,chemical reactions and other processes are mutually conditioned and affect each other.Therefore,the simulation optimization of the smelting process of powdered iron sand suspension is carried out to obtain the influence law of the relevant parameters on the smelting process,so as to provide reference for the design and development of powdered iron sand suspension smelting furnace.In this paper,the reaction tower of an institution’s iron concentrate sand suspension smelting furnace is used as the research object for simulation study,and the influence law of each factor on the smelting process is obtained,and the optimization study is carried out.The main conclusions are as follows.（1）Baseline model simulation results:5m from the top of the tower,industrial oxygen into the reaction tower to form a downward movement and gradually expand the column of gas,and then the column of gas tends to stabilise,0-5 m area there is along the wall of the tower upward reflux;high temperature area appears in the top of the tower 2.5-5.5 m area,the highest temperature is 2590 K.iron ore particles into the reaction tower temperature gradually increased,in the high temperature effect Fe₂O₃is reduced to Fe₃O₄and Fe O in turn,Fe O and CO react rapidly to produce Fe,and at 8 m from the top of the tower the iron ore concentrate content reaches 95%,and the iron ore concentrate is basically completely reacted.（2）The influence of various factors on the smelting process:the central oxygen and side oxygen velocity ratios have an influence on the combustion of pulverised coal,particle trajectory,temperature distribution in the tower,and the mixing effect of iron concentrate sand and CO;the industrial oxygen concentration directly affects the average temperature size and CO concentration in the tower,and the reduction rate of iron concentrate sand;the amount of pulverised coal feeding can change the degree of gas-particle mixing in the reaction tower,the dispersion effect of particles,and the chemical reaction effect.When the central oxygen and side oxygen rate ratio increases,the industrial oxygen concentration increases,the reduction efficiency of the iron concentrate sand increases,the position of the iron monomer mass fraction of 95%in the iron concentrate sand shrinks the height from the top of the tower,the average temperature in the reaction tower decreases,and the average mass fraction of CO at the bottom of the reaction tower decreases.（3）Through orthogonal test analysis,the best solution A₃B₃C₁was obtained,i.e.central oxygen and side oxygen rate ratio 3.5,industrial oxygen concentration 95%,pulverized coal input quantity 3.06 t/h.Compared with the basic working condition,the particles in the optimized working condition are well dispersed,the reaction rate is accelerated,the mass fraction of Fe in iron ore at 5m from the top of the tower reaches 95%,which is 2.5 m less than the basic working condition.The average mass fraction of CO at the outlet of the reactor tower is reduced from 17.8%to 12.1%,which increases the utilisation rate of pulverised coal and reduces harmful gas emissions;the particle flow in the optimized reactor tower is smooth,the average temperature in the tower is reduced and evenly distributed,which can extend the service life of the refractory lining of the reactor tower.41 figures,19 tables,69 references...