| 摘要 |
An axial flow mixing impeller system (10) for efficient mass transfer by control of size of the bubbles of the fluid which is being dispersed is obtained by creating passageways (5) through the impeller blades for flow between the suction (48) and pressure (46) sides of the blades which disrupt s the flow over the suction sides of the blades thereby reducing the tendency for bubbles to grow into large bubbles which instead of being dispersed, ris e to the surface without effective mass transfer to the liquid. The blades (24 , 26, 28) may be slotted inwardly from the tips (52) to provide the passageway s or may be formed from segments (114, 116, 118), gaps between which provide t he flow passageways. The segments may be in edge-to-edge abutment. Gas-to-liqui d dispersion may be improved by sparging below the impeller at the bottom of t he tank and between the impellers in the tank, enabling gas supply as different pressures.
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