Optimization of Grinding System for Woody Powder Production

To investigate biomass classification technology, such as rotary classifier, and to select appropriate biomass classifier. Through the change of different feeding rates and rotation speeds of the classifier, the classification efficiency and Newton classification efficiency, specific particle size and uniformity index, the recoveries of coarse and fine powder and energy consumption were measured. The results indicate that feeding rate and rotation speed have an important effect on the classification. When the rotation rate of classifier is 300rpm, the classification efficiency decrease basically, but in 78.96kg/h, it is the maximum. And Newton classification efficiency would decrease at first and then increase, in 88.96kg/h, it is the lowest. When the feed rate are 78.96kg/h and 88.96kg/h, as the rotation speed increases from 50r/min to 150r/min, there is a moderate increase in uniformity coefficient, that means the biomass size distribution becomes narrower. The energy consumption means the pulverizer capacity is larger, the less is the wasted energy. It is a common sense that the larger the mill, the higher the efficiency.