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Speed
The mixers and Agitators maximize process flexibility by allowing blades to be installed, removed, and changed to various pitches, depending on what works best for the application at hand. From a maintenance perspective, The blades are desirable because individual blades can be replaced if they become damaged, not the entire agitator; hence, the mechanical seal isn’t disturbed and repair costs are minimized.
Homogenizing agitators ; - due to its capacity for intensive dispersing mixing, this type of agitator is perfect for achieving high homogeneity of the product. A homogenizing agitator is able to digest powders, fibrous substances. The turbine may be built in directly in the bottom of a tank or in an additional casing connected with the tank chamber in a closed cycle. There are also in-line systems, where the agitator is an separate device. Such a design permits reduction of investment costs wherever homogenization of the product is not required throughout the process.
Agitator models | Application | Advantages | Disadvantages |
Paddle: · Flat paddles · Finger paddles · Gate paddles | · Solid mixing · Slurry mixing | · Heavy duty mixing · Adjustable to 2 or 4 blades · Excellent for low-speed | · High power consumption · Inefficient liquid circulation |
Counter-rotating paddles | Paste mixing | · Efficient in the laminar condition · Blending | · Vibrates at high speed · Not suitable for liquid mixing |
Tumbling | Blending | Paste and viscous material mixing | Not suitable for fluid solutions |
Disk and cone | Polymers and dispersionpreparation | Viscous solution mixing with 60 revolutions per second | Paste mass cannot be handled |
Free shaft suspension | Sugar processing | Suspension, Thickening operation | High power requirement |
Impeller type | Emulsion preparations | · Good temperature control · Creates axial flow · Good phase mixing | Not for viscous materials |
Turbine agitator · Straight blade · Pitched blade · Vaned disk · Curved blade | Liquid and gas reactions | · Excellent for dispersionoperations · Creates good radial flow | Only for less viscous liquid below 15 to 20 Ns/m2 |
Slotted rotary · Rotating disk | Powders and | Unique particle size and homogeny product formation | · Minimum axial flow · Operates better only for 0.1 to 0.01mm particle size solids |
Screw · Screw in cone | Food and snack processing | Homogenization of high viscous materials | Not suitable for miscibility operations |
Helical · Ribbon type · Helical screw | Polymer and paints processing | Handles viscoelastic liquidsthat are more than 20 Ns/m2 | Less radial flow patterns |
Gate | Blending operations | · Good speed control · Handles pseudoplastic liquids | Not suitable for gas to liquid operations |
Anchor · Round anchor · Combine anchor and gate | Milk and fat processing | Efficient heat exchange between the reactor walls and reaction mass (fluids) | · High power consumption · Requires heavy duty gearbox |
Propeller | · Dairy and food processing · Chemicals processing | · Less Metzner –Ott shear rate constant · Homogenization · Good miscibility | · Motion of liquid starts on one spot · Dead spots formation at high rotation speeds · The occurrence of solids settling at low speeds |
Example
The mixers and Agitators maximize process flexibility by allowing blades to be installed, removed, and changed to various pitches, depending on what works best for the application at hand. From a maintenance perspective, The blades are desirable because individual blades can be replaced if they become damaged, not the entire agitator; hence, the mechanical seal isn’t disturbed and repair costs are minimized.
Homogenizing agitators ; - due to its capacity for intensive dispersing mixing, this type of agitator is perfect for achieving high homogeneity of the product. A homogenizing agitator is able to digest powders, fibrous substances. The turbine may be built in directly in the bottom of a tank or in an additional casing connected with the tank chamber in a closed cycle. There are also in-line systems, where the agitator is an separate device. Such a design permits reduction of investment costs wherever homogenization of the product is not required throughout the process.
Agitator models | Application | Advantages | Disadvantages |
Paddle: · Flat paddles · Finger paddles · Gate paddles | · Solid mixing · Slurry mixing | · Heavy duty mixing · Adjustable to 2 or 4 blades · Excellent for low-speed | · High power consumption · Inefficient liquid circulation |
Counter-rotating paddles | Paste mixing | · Efficient in the laminar condition · Blending | · Vibrates at high speed · Not suitable for liquid mixing |
Tumbling | Blending | Paste and viscous material mixing | Not suitable for fluid solutions |
Disk and cone | Polymers and dispersionpreparation | Viscous solution mixing with 60 revolutions per second | Paste mass cannot be handled |
Free shaft suspension | Sugar processing | Suspension, Thickening operation | High power requirement |
Impeller type | Emulsion preparations | · Good temperature control · Creates axial flow · Good phase mixing | Not for viscous materials |
Turbine agitator · Straight blade · Pitched blade · Vaned disk · Curved blade | Liquid and gas reactions | · Excellent for dispersionoperations · Creates good radial flow | Only for less viscous liquid below 15 to 20 Ns/m2 |
Slotted rotary · Rotating disk | Powders and | Unique particle size and homogeny product formation | · Minimum axial flow · Operates better only for 0.1 to 0.01mm particle size solids |
Screw · Screw in cone | Food and snack processing | Homogenization of high viscous materials | Not suitable for miscibility operations |
Helical · Ribbon type · Helical screw | Polymer and paints processing | Handles viscoelastic liquidsthat are more than 20 Ns/m2 | Less radial flow patterns |
Gate | Blending operations | · Good speed control · Handles pseudoplastic liquids | Not suitable for gas to liquid operations |
Anchor · Round anchor · Combine anchor and gate | Milk and fat processing | Efficient heat exchange between the reactor walls and reaction mass (fluids) | · High power consumption · Requires heavy duty gearbox |
Propeller | · Dairy and food processing · Chemicals processing | · Less Metzner –Ott shear rate constant · Homogenization · Good miscibility | · Motion of liquid starts on one spot · Dead spots formation at high rotation speeds · The occurrence of solids settling at low speeds |
Example
