Simulation Analysis And Optimization Of Particle Mixing Characteristics In Intensive Mixer

Due to the limit of natural rich ore resources,in order to make full use of iron ore resources,the proportion of man-made rich ore in blast furnace raw materials h as increased year by year,and the proportion reached more than 98%.Sinter is an important form of artificial rich ore,and the mixing degree of si ntering raw material greatly affects the quality of sinter.At present,the proportion of fine iron ore and ultra-fine iron ore shows a continuous increasing trend.Its particle size is finer and its water affinity is poor.It is difficult to uniformly disperse water in traditional cylinder mixers.Therefore,the intensive mixer is widely used in the sintering industry.Practice has proved that the application of the intensive mixer can achieve the effect of improving quality and efficiency,and has many advantages such as simple structure,compactness,and small footprint.The uniformity of sintering raw materials in the intensive mixer is affected by many factors.At present,equipment design is mostly based on traditional products,and relevant operating parameters are adjusted on-site based on experience to mix sintering raw materials with good proportions.The mixing uniformity cannot be accurately controlled,and there are problems of over-mixing and under-mixing.In order to improve the mixing uniformity and mixing efficiency of sintering raw materials,this paper is based on the method of combining experiment and discrete element si mulation,taking the horizontal intensive mixer as the research object,and doing the following related work.(1)Analyze the composition and working principle of the horizontal intensive mixer in detail;explain the development status of the mixing equipment and the research shape of the process parameters.(2)Analyze the particle mixing mechanism,select appropriate mixing uniformity evaluation indicators;select the discrete element method for simulation,and establish a simulation mathematical model;According to the contact parameters required in the mathematical model,the method of combining static accumulation angle a nd dynamic accumulation angle experiment and virtual experiment is adopted to calibrate the contact parameters.(3)Model and simulate the mixing process of the horizontal intensive mixer based on the discrete element method,analyze the movement and mixin g uniformity of the dyed stones during the mixing process;build a horizontal intensive mixer test bed,and use the dyed stones as the mixed material to test,Compare with the simulation process to verify the reliability of the discrete element simulation model.(4)Based on the verified discrete element simulation model,establish a sintering raw material mixing simulation model to simulate the sintering raw material mixing process;The four factors of particle size,filling rate,moisture content,and ro tor assembly speed are selected to analyze their influence on mixing uniformity,material mixing time and wear.(5)Design an orthogonal experiment to analyze the influence of each factor on the test index when the four factors of mixed raw material partic le size,filling rate,moisture content,and rotor assembly speed work together;Obtain the optimal combination of operating parameters for the two test indicators of the best mixing degree and the shortest mixing time respectively.