Application Research of Venturi Feeder in Powder Flash Calcination Device
According to the requirements of the powder flash calcination device for the pneumatic conveying powder supply system,a combination of rotary blade feeder and Venturi feeder is selected for feeding.The process parameters such as gas source,receiving chamber and conveying pipeline pressure are measured,and the influences of geometric structural parameters of Venturi feeder on receiving chamber pressure and powder supply stability are analyzed.The results indicate that under the same flow rate conditions,a decrease in nozzle size leads to an increase in flow velocity at the nozzle,which is beneficial for improving the negative pressure in the receiving chamber;when the throttling ratio is set to 0.5,the velocity of powder conveying at the cross-section of the powder conveying pipeline is uniform,which can reduce pipeline resistance and increase the negative pressure of the receiving chamber;when the distance from the nozzle outlet to the receiving chamber is set to 20 mm,the matching degree between the receiving chamber and the negative pressure zone is high,and the powder conveying is stable;the flow rate of the conveying medium should be higher than 35 m3/h,which can effectively avoid the phenomenon of powder settling.
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