Influence and optimization of ultra-fine classification grinding disc structure on flow field in crushing chamber
In the processing of non-metallic materials,the ultra-fine classification mill is an ultra-fine powder prep-aration equipment which integrates ultra-fine grinding and classification,whose principle is to make use of the high-speed rotation of the grinding chamber.The material in the grinding chamber has a fierce impact and collision with the blade on the grinding disc,and it is crushed under the dual action of machinery and air flow.The study of the mechanical structure,flow field distribution and its influencing factors in the crushing chamber has important engineering significance to ensure the ultra-fine grinding particle size and improve the grinding efficiency.In this paper,the flow field of ultra-fine classification mill is numerically simulated by computational fluid dynamics soft-ware Fluent,and the flow field distribution is observed by single factor experiment.The experimental results show that the change of the number and width of the blade on the grinding disc has little influence on the air flow veloci-ty in the grinding chamber,but has a great influence on the air pressure and axial velocity in the grinding chamber.The movement of the material entering the grinding chamber is not fully dispersed to the grinding area,which is easy to cause agglomeration.The structure of the grinding disc in the grinding chamber is optimized by using the simulation results,and the optimization results are verified.
ultra-fine classification millnumerical simulationFluentcrushing chamberflow field
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