NSL Verticle Top-Mounted Agitator

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NSL Verticle Top-Mounted Agitator

N-Spindle agitators are built with heavy duties Sumitomo Cyclo Drive and are designed with simplifies and user-friendly routine maintenances. Technicians are able to change mixer bearing without required lifting up the shaft and propellers.

Description

N-Spindle agitators are built with heavy duties Sumitomo Cyclo Drive and are designed with simplifies and user-friendly routine maintenances. Technicians are able to change mixer bearing without required lifting up the shaft and propellers.

N-Spindle top-mounted vertical agitators use aerodynamic technology, to ensure minimal power consumption, reliable operation and optimum process results.

N-Spindle NSL that includes a site clamp mounting bracket design is designed especially for small tank mixing tank solutions.

Applications:

  • Municipal Waste Water Plant
  • Industrial Waste Water Treatment Plant
  • Chemical Process Industry
  • Pharmaceutical Industry
  • Raw Water and Drinking water process plant
  • Power Plant
  • Food Industry
  • Paint Industry

Features

The Agitator Process:
A rotating agitator generates high speed streams of liquid which in turn entrain stagnant or slower moving regions of liquid resulting in uniform mixing by momentum transfer. When it is necessary to mix materials of different densities, it is better to use vertical flow agitators because of the tendency of sedimentation of the denser component. Wherever possible, movement of the entire amount of material together in the mixing vessel, which occurs frequently during the agitation process, should be avoided because of the unwanted separation caused by centrifugal forces.

Agitator Parts:
At the simplest level, agitators consist of an impeller and a shaft. An impeller is a rotor inside a tube or conduit attached to the shaft. It is used to increase the pressure and flow of a fluid. Modern agitators use sophisticated process control electronic devices to regulate the mixing process.

Technically speaking, for a liquid-liquid mixed process, shear rate is the greatest consideration during agitator selection and design. The shear rate decreases exponentially with distance from the agitator. Thus the shear stresses and strain rates vary greatly throughout an agitated liquid in a tank. As the viscosity of the fluids to be mixed increases, the physics fluid mechanics change from that of turbulent flow (like in liquid agitators) to that in which viscous drag forces dominate. Additionally, some fluids exhibit Non-Newtonian behavior – their viscosity cannot be designated by a single coefficient. Mixing of such fluids requires special heavy duty agitators. As the dynamic viscosity of a Newtonian liquid is independent of shear at a given temperature, its viscosity will be the same at all points in the tank. In contrast the apparent viscosity of a non-Newtonian liquid varies throughout the tank. This in turn significantly influences the mixing process. For shear thinning liquids, the apparent viscosity is at a minimum in the immediate vicinity of the agitator. The progressive increase in the apparent viscosity of a shear thinning liquid with distance away from the agitator tends to dampen eddy currents in the mixing tank. In contrast, for shear thickening liquids, the apparent viscosity is at a maximum in the immediate vicinity of the agitator. In general shear thinning and shear thickening liquids should be mixed using high and low speed agitators respectively.

Fluid Movement in Process Agitators:
Wherever possible, the movement of the entire contents of the agitator vessel should be avoided as rapid movement tends to segregate the components due to centrifugal forces.

 The mixing time is short if the components to be mixed undergo a large number of changes of location. This can take the form of movement of the agitator itself or of material flows generated by the agitator. They can be achieved by impact, flow around obstacles, crossing directions of flow and speed differentials at the interfaces of parallel flows.

Prepeller Designs

  • Rushton, 2 to 8 Blades, D types: Good for immiscible liquids
  • Turbine, 4 Blades, A4 type: General purpose – Rapid mixer, chemical blending and solid suspensions
  • Turbine, 3 Blades, HA type: Light weight light, high efficiency
  • Turbine, 4 Blades, type, pump down/up: A cost effective impeller for both turbulent; Laminar and solid suspension application
  • Rushton, 6 Blades, G type: Gas dissolved applicationsImpeller
    for general purpose
  • Marine propeller: Best for high speed mixer which demand; For high efficiency of turbulent flow
  • Turbine, 2 Blades, P2-type: Common paddle impeller for flocculation
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