Generators, Turbines & Power Plants #5818835
Pitched Blade Turbine
- Impeller Diameter 450 mm to 3000 mm
- Hub with even number of blades are mounted at an angle of 10 to 90 with respect to the horizontal
- The most commonly used impeller of this type is the four bladed 45 pitched blade turbine
- Mixed flow impeller as fluid discharge has both axial and radial components
- Generally down-pumping
- Up-pumping in applications such as gas dispersions and floating solids mixing
- Used in flow control applications
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Rushton Turbine
- The Rushton turbine is a disk type (six blade turbine) radial flow impeller.
- The diameter of the disk ranges from 66 to 75 percent of the internal vessel diameter.
- Impeller design is best suited for gas liquid contacting because of the circular disk.
- Gas is introduced through a sparger below the impeller; the disk directs the gas along a path of maximum liquid contact and prevents the gas from taking the direct vertical route along the mixer shaft
- Variant of the Rushton turbine is the Smith impeller in which the impeller blades are semi circular or parabolic, instead of flat.
- For gas dispersion, the impeller shape allows for much higher power levels to be obtained in the process as compared to the Rushton turbine.
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Open Blade Turbine
- In open blade turbine, the blades are directly mounted on the hub. The number of blades may be two, four, six or eight.
- Two-blade paddle is generally used for solid suspension or blending applications requiring high flow and low shear.
- Paddles are normally operated at low speeds
- Coil impellers were developed for applications where solids frequently settle at the bottom of the vessel
- Spring design ensures that the impeller has adequate mechanical rigidity, strength to overcome the resistance offered by stiff solids during mixing operation
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Mumbai, Maharashtra, India
