HIGH SPEED STIRRER / AGITATORS

SHAKTI MAKE HIGH SPEED STIRRER / AGITATORS

Industrial agitators or High Speed Stirrers are machines used in industries that process products in the chemical, food, pharmaceutical and cosmetic industries, in a view of:

Mixing liquids together promote the reactions of chemical substances keeping homogeneous liquid bulk during storage increase heat transfer (heating or cooling)

They are devices used to stir or mix fluids, liquids specifically.

 

SEW Stirrers come in a vast array of shapes and sizes, including marine propellers, foils, axial and radial flow turbines, gate and anchor stirrer/scrapers, etc. These different types of impeller blades characterize the flow produced and allow agitators to be used for the broadest range of viscosities and batch sizes. If the viscosity is relatively low (for instance, 1 cP or less) these devices can handle batches up to several hundred thousand gallons. As for the viscosity range that can be accommodated, turbine type agitators can operate with fluids of up to 75,000 cP. Slow-speed gate or anchor and gate configurations can handle up to 500,000 cP.

 

Despite the wide range of capacities and viscosities they can handle, the low shear nature of agitators limits their effectiveness to performing simple tasks such as blending liquids of like viscosities, maintaining in-tank uniformity, and producing flow in a vessel to promote heat transfer from jacketed vessel walls. Where the product has to be processed in some way – liquids of differing viscosities are being blended, powders dispersed and hydrated, an emulsion or suspension formed, solids dissolved or disintegrated and so on, an agitator can take a long time to achieve the required results or, more often than not, is simply not capable. SEW High Shear Rotor/Stator mixers are ideal for these types of applications and can cut mixing times by up to 90%, offering improved yield and product quality and greater batch-to-batch consistency.

 

These advantages are further increased by the use of easily interchangeable work heads and screens which allow any one SEW mixer to perform the duties that in the past may have required several different pieces of process equipment.

 

TYPES OF HIGH SPEED STIRRER / AGITATORS

 

Mainly 4 types of Agitators are used in Pharmaceutical reactors, they are

 

1. Anchor

2. Turbine

3. Propeller

4. Gas induction

 

Several different kind of industrial agitators exist

 

Mechanical agitators (rotating)

Static agitators (pipe fitted with baffles)

Rotating tank agitators (like concrete mixer)

Agitator mixer paddle type

Agitators working with a pump blasting liquid

Agitator turning thanks to gas

 

 

 

 

 

 

 

 

Principle

 

The agitation is achieved by movement of the heterogeneous mass (liquid-solid phase) to the impeller. This is due to mechanical agitators, to the rotation of an impeller. The bulk can be composed of different substances and the aim of the operation is to blend it or to improve the efficiency of a reaction by a better contact between reactive products. Or the bulk is already blended and the aim of agitation is to increase a heat transfer or to maintain particles in suspension to avoid any deposit.

 

Agitator Data

 

The agitation of liquid is made by one or several agitation impellers. Depending on its shape, the impeller can generate:

The moving of the liquid which is characterized by its velocity and direction. Turbulence which is an erratic variation in space and time of local fluid velocity. Shearing given by a velocity gradient between two filets of fluids.

These two phenomena provide energy consumption.

 

SEW agitators are designed for a wide range of volumes and pressurized or unpressurized vessels. The unit can either be directly driven by a motor or together with a gearbox. A connection of the motor via IEC-adapter or a gear motor are also possible. The shaft can either be sealed by a mechanical seal or other seal types

 

STANDARD DESIGN

 

Lantern with double bearing and elastic coupling

Mounting flange/-plate

Splitted shaft (in-tank flange coupling)

 

SEALING SYSTEM

 

Single-acting dry-running mechanical seal

Double-acting fluid lubricated mechanical seal

Stuffing box

Cup collar

Shaft seal ring

Lute seal

Seal supply systems

Individual sealing liquids

Sealing liquids and elastomers with FDA

 

ADDITIONAL FEATURES

Steady bearing

Short heat trap

Collector tray

Shaft speed measurement

Flush

 

SEW SPECIFICATIONS

MOTOR POWER                                   0.75 TP 75 KW

SHAFT DIAMETER                     40 TO 120 MM

OPERATING PRESSURE             12 BAR VACUUM

IMPELLER DESIGN                    SEW STANDARD

MATERIAL                                Carbon steel, rust- & acid resistant steels, nickel-base alloy,

Duplex- & Super Duplex steels