Classification Performance and Flow Field Characteristics of Shuttle-Shaped Three-Product Cyclone
In order to reduce the upper limit of coal slurry flotation particle size and reduce the amount of floating coal slurry,a shuttle-shaped three-product cyclone with the upper overflow for fine-grained,the side overflow for intermediate-grained and the bottom flow for coarse-grained was designed.Taking the coal slurry below 1 mm as the research object,the classification performance of the shuttle-shaped three-product cyclone and the ordinary cyclone was compared,and the internal flow field was numerically simulated.The results show that the ash of coarse particle in the side overflow of the shuttle-shaped three-product cyclone can meet the requirements of fine coal ash.When the diameter of the underflow port is 16 mm,the total overflow ratio is 19.05％,and the total ash is 8.67％.The shuttle-shaped three-product cyclone has the characteristics of fine classification and direct separation of coarse particle fine coal.It can be used as the classification before flotation feed,which can reduce the flotation feed amount and reduce the production cost.Compared with the ordinary cyclone,the distribution rate of coarse particles above 0.25 mm in the overflow of the shuttle-shaped three-product cyclone is reduced by 4.13 percentage points,and the distribution rate of fine particles below 0.074 mm in the underflow side overflow is reduced by 11 percentage points.The coarseness of the overflow and the fineness of the underflow are obviously reduced.The simulation results of the flow field show that the zero-speed envelope surface of the lower cone area of the shuttle-shaped three-product cyclone moves outward,and the zero-speed envelope surface of the cylinder area moves inward,which is the fundamental reason for reducing the entrainment of fine mud in the underflow and the overflow run rough.
万方数据
维普
