Study On The Key Equipment And Process Technology Of Whole Grain Mixing Powder

Crushing and drying are the key links in the process of whole grain mixing powder. Thisarticle mainly does some systematic research into the ultrafine crushing pulping and the spraydrying technology of the produce of whole grain mixing powder, and analyzing the shear typewet ultrafine pulverizer comprehensively.Firstly, we analyze the characteristics of typical grain material, and do some research intothe mechanism of material crushing from the perspective of grinding dynamics and energytheory, combined with fiber crushing theory. It is concluded that the most effective way togrind the whole grain materials should be shear crushing. Based on the theoretical analysis,the ultrafine grinding experiments for typical whole grain material are made using the existingshear crushing equipment to explore the influence of rotor speed, the static blade clearance(with the number of static blade as a reference) and the number of cycles on the crushingeffect. And then the L9(33) orthogonal test is conducted to optimize the structure andoperating parameters in the process of wet superfine crushing for whole grain material. Theresults show that, within a certain range, the higher rotor speed, the smaller static blade gap,the more cycles, the smaller the particle size after crushing. According to the research, therotor speed has the biggest effect on the grinding result, the static blade clearance takessecond place, and the cycle times affect the minimum. When the rotor speed is9000r/min,the static blade number is222, and the cycles are3times, the average particle size of grainwhich was pulverized could reach about30μm.Then, the general structure and key components of the shear type wet ultrafine crusherare optimized on the basis of crushing theoretical and experimental studies. The stator cutterhead and impeller rotor are the most important. And then using FLUENT software to simulateand calculate the internal flow field of crushing chamber. Analysis focused on the effects ofdifferent impeller rotor types, different deflection angle of static blade and different rotationspeed to the flow field. It is concluded that the optimal impeller rotor type is straight vanetype with6vanes. The best static blade deflection angle is2°.Next, the drying technology of whole grain mixing powder is researched. Through thecomparative analysis, we find that the appropriate drying method for whole grain mixingpowder processing is spray drying. And then optimize the process conditions and explore theinfluence of enzymolysis degree on the spray drying effect according to experiments. The bestinlet and outlet air temperature of spray drying is160℃and80℃respectively. The optimalenzymatic amount is0.1%of the dry materials.Last, the preliminary study on industrial production of whole grain mixing powder isconducted on the basis of previous research. In order to provide a good industrial solution forthe production of whole grain mixing powder, the mainly work is focused on processoptimization and system design, as well as the selection of key equipments.