Agitated Filter is a closed vessel designed to separate solid and liquid by filtration under pressure or vacuum. The closed operation ensures odorless. Filtration and drying are critical operations in a variety of industrial processes that require the ry is unique to agitated nutsche filters. Agitated. Nutsche Filter &. Dryer (ANF/ANFD). NSI. E Q U I P M E N T S . Operation. Agitated Nutsche Filters are extensively used in Chemical,. Herbal.

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The ends must be cut in an angle to ensure a perfect seal.

The filter is charged with slurry and pressure is applied to displace the filtrate leaving the cake retained over the filter medium. Hydraulic Cylinder for Reslurry Arms. In addition two auger arms smoothen the cake by rotating in one direction and convey the cake towards the center for discharge by rotating in the opposite direction. Nutsche Filters are operating as part of a batch system hence the vessel’s volume is designed to accept an entire charge of slurry from ntusche upstream equipment.

To take advantage of the drying ability of the Nutsche Filter it is worth considering the option of heating components such as the vessel, filter floor and paddles to enhance drying. As such these are very sophisticated machines with tight process control on parameters such as pressure, temperature and pH.

It consists of an oil tank on which a pump is provided for circulating high-pressure oil through a control valve system and to hydraulic cylinders. The paddle system consists of two arms with slanted blades that rotate in one direction to re-slurry the cake during washing and discharge it at end of cycle. One of the advantages of the Nutsche Filter is the ability to smoothen the cake’s surface prior to applying spray wash so that the entire bed is washed evenly.

The filter floor consists of a densely perforated plate sufficiently strong to hold the cake weight and the pressure that is exerted on the cake’s surface. To view the components move mouse pointer over the menu. Agitated Nutsche filters are used widely in the production processes of pharmaceutical, chemical and laboratory industries, among others.


Nutsche Filters are available in almost any size with the larger machines for a slurry filling batch of 25 m3 and a cake volume of 10 m3. During resuspension the rotating arms are moving slowly downwards and are “shaving” the bed gradually layer after layer until the entire cake enters the slurry.

This is achieved by a special detector that monitors the surface of the cake for moisture and once air or gas start entering the bed a signal is transmitted to close the filtrate valve and reopen it once next washing commences.

Washing efficiency may be further improved if air or gas are not allowed to enter the cake in a multi-washing system so the wash liquids always displace the solutions in a “piston” like manner. The swing type locking bolts that attach the head and cylinder on the smaller machines to the filter floor. This is done by resuspending the cake with the paddle arms for thorough mixing with the wash solution. For applications that require preservation of temperature the vessel may be double-walled or half-pipe jacketed to provide effective heat transfer to the product.

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The control system for modern Nutsche Filters is very sophisticated since it activates and deactivates many components as may be seen in the section Operational Sequence. The agitator performs a number of operations through movement in axes both parallel and perpendicular to the shaft.

The vent nutcshe top of the head must be checked for free evacuation of air. Such filters have a filtration area of 15 m2 and are suitable for fast filtering slurries that produce readily 0. Nutsche Filters are well suited for handling flammable, toxic, corrosive and odor-noxious materials since they are autoclaved and designed for use in hazardous and ex-proof environments when extremely safe operation is required.

Agitated Nutsche Filter

On some filters the cloth or woven mesh screen may be backwashed with water to dislodge and remove any cake residue that adhered to the medium after cake discharge. The paddle arms are rotated in the opposite direction for cake smoothing to seal cracks prior to cake drying. The pressure relief valve that is located on the top of the dished head must be checked for emergency functioning.


The two options of cake discharge may be viewed on the image to the right and both discharge a delumped cake.

Therefore, so that the idle time of the agiatted is kept to a minimum, sufficient holding volume is required for fast charging and emptying of the vessel. Cake Discharge Once all the stages are completed the cake discharge valve opens and the paddle arms on the smaller machines or the auger arms on the larger ones are rotated and lowered to convey the dry cake towards the center.

Present day Nutsche Filters are constructed to perform a multitude of tasks including reaction, filtration, cake washing and thermal drying on a single unit.

Agitated Nutsche Filter – Chempro Gujarat India

The vessels are generally designed for an operating pressure of bars but higher pressures may be specified if required. In their modern version they were developed in the early 80’s and the majority operates, usually under pressure, in batch oriented industries such as fine chemicals, dyes, pharmaceutics nuhsche pesticides. When this happens the fines seal the cake and slow down the cake formation so keeping the slurry in suspension with rotating arms during filtration assists in forming a homogeneous cake.

Agitated Nutsche filter ANF is a filtration technique used in applications such as dyepaintand pharmaceutical production [1] and waste water treatment.

Further reduction in cake moisture may be obtained by slowly rotating and lowering the paddle arms to scrape and delump the cake. These cylinders are provided for vertical movement of the agitator, discharge product and sometimes detach the bottom to clean the filter before changing the product.

This page was last edited on 28 Novemberat This may have a layout impact on the downstream facility such as the conveyor that handles atitated product to storage. On the larger filters additional support to the plate is given by ribs between the vessel’s floor and the filter plate.

Retrieved from ” https: The vessel can be made completely leak-proof for vacuum or pressure service.