The Different Types of Agitators Used in Agitated Nutsche Filter Dryers

2023/04/13

If you are searching for efficient ways to separate solids from liquids, then an Agitated Nutsche Filter Dryer (ANFD) is a popular choice in the chemical and pharmaceutical industries. ANFDs combine filtration, washing, and drying into a single unit, making them a versatile option for many different processes.


One of the essential parts of ANFDs is the agitator, which is responsible for effectively mixing the product and ensuring uniform drying. In this article, we will discuss the different types of agitators used in ANFDs.


1. Paddle Agitator


The paddle agitator is one of the most widely used agitators in the industry. It consists of a set of paddles attached to a shaft that rotates around the vessel’s axis. Paddle agitators create a gentle fluidizing motion to the mixture, ensuring that the product is thoroughly mixed and consistent.


2. Anchor Agitator


The anchor agitator comprises a central shaft with a set of scraping blades. The anchor imparts a gentle, low-shear agitation to the product, making it suitable for delicate products that may be sensitive to mechanical stress. This agitator design can handle high-viscosity fluids and sticky solids, making it an important choice for many processes.


3. Hydrofoil Agitator


Hydrofoil agitators are high-speed agitators and provide high shear forces. They work well with low-viscosity fluids and are used in applications where high mixing rates are required. Hydrofoil agitators can handle both liquid and solid products, making them an excellent choice for processing material with different properties.


4. Turbine Agitator


A turbine agitator consists of a set of blades attached to the central shaft, rotating at high speeds to generate high shear forces. It is capable of rapidly dispersing the product, and producing uniform mixing of high-viscosity fluids. Turbine agitators are useful for processes requiring a high degree of product dispersion.


5. Ribbon Agitator


Ribbon agitators consist of a set of continuous helical ribbons which can move the product in axial and radial direction. Ribbon agitators are ideal for mixing and drying cohesive powders and fibrous materials. Since ribbon agitators are capable of sweeping the vessel wall, they can help minimize the formation of “dead zones” where product tends to accumulate.


In conclusion, selecting the right agitator for your ANFD is an essential step to ensure smooth and efficient operation. Each type of agitator brings its unique qualities that cater to specific applications. When choosing an agitator, it is essential to consider factors such as viscosity, product composition, mixing rate, and drying requirements. It is always best to consult with the equipment supplier to select the best possible agitator for your particular application.

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