Study On The Flow Patterns Of Comminuting Process In A Superfin Pulverizer

As materials are machined finer and finer, ultra-fine pulverization technique is used in a good many industries. In this paper, application and market status of ultra-fine pulverization equipments are introduced. At the same time, intestine and overseas development and current of ultra-fine pulverization equipments are assumable presented. In order to find out ways to solve problems about efficiency of comminuting set and granularity of the product, numerical simulation is used in the study. The results directly throw out the flow pattern in a superfine pulverizer and provide information to further study on comminuting process.Numerical simulation of the gas-solid flow in a superfine pulverizer has been investigated using computational fluid dynamics package with RNG k-εturbulent model, as well as Mixture model and particle trajectory model. Pressure and velocity frame of the flow is researched and explained. When rotating speed and hammer- screen gap and pressure change, the flow pattern in the superfine pulverizer change either. At the same time, comminuting efficiency is relative to the flow pattern. So it will alter too. Making use of the relations among these three factors, influence of diverse operation parameters and structure parameters to the comminuting efficiency can be found out. The conclusion is useful to investigation of parameter optimization.Calculating processes of mixture model and particle trajectory model, including purpose and means of various menus, are put forward, with the help of many books and data on computational fluid dynamics. Problems which often come into being in simulation process are accounted for. All of these are important information for similar numerical simulation.Based on the comminuting principle, factors which effect comminuting efficiency are summarized and analyzed. A few conclusions are chalked up. Through the study of experiments, the correctness of those conclusions is confirmed. On the side, it also provides auspice and argument for the numerical simulation. Depending on this, several constructive suggestions are proposed to afford foundation for ameliorating the equipment.