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Agitated Nutsche Filter

Agitated Nutsche Filter
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Agitated Nutsche Filter is a closed vessel designed to separate solid and liquid by filtration under pressure or vacuum or in combination of both. The resulting wet cake can be re-slurried and washed thoroughly with water or solvent. The discharge of wet cake is automatic. Drying of wet cake is also possible when drying features are incorporated. The closed system ensures odourless, contamination free and non-polluting working conditions maintaining product purity and hygiene. Agitated Nutsche Filters are extensively used in CHEMICAL, HERBAL, PHARMA, AGRO CHEMICAL & FOOD Industries.

Description
Agitated Nutsche Filter consists of a cylindrical shell with a welded dished end at the top and a flat welded end at the bottom. The vessel is divided into two compartments by means of a perforated plate, provided with suitable filter cloth. The base plate is having arrangement of bolting bar to hold the filter cloth. Suitable support mesh is provided under filter cloth to facilitate the flow of filtrate. An agitator of unique design and rigid and in "S" curved provided inside the vessel to perform the movements of vertical and rotational directions simultaneously, by means of push buttons switches/PLC. and to take the high torque generated during solid discharge and re-slurring operation.

OPERATION
Slurry is fed into the top compartment from where filtrate passes into the lower chamber en route to receiver. Solids are deposited on the filtering media in the top compartment and take the shape of cake of a uniform thickness. The agitator pushes the solid content in the slurry upwards by keeping it under suspension till maximum possible filtrate passes through the filter bed. It then seals the cracks in the cake, which develops after most of the filtrate has passed through, by smoothening the top surface of the cake.

Agitated Nutsche Filter Dryer also squeezes out some of the moisture in the cake by slightly pressing the cake uniformly with the help of specially designed blades. After the separation of solvent/mother liquor and if the cake requires washing, the entire cake can be re-slurried and agitated, so that all the particles forming the cake can be exposed to wash liquor and be thoroughly washed through the specially designed agitator. This improves quality of the finished products. After washing and removal of wash liquor, the cake can be discharged through a quick opening side discharge door, by rotating and lowering agitator in the discharge direction. No manual handling is required.

Operation Cycle of ANF:
  • CHARGING : Slurry is charged into filter preferably by gravity flow from Reaction installed above the filter or by slurry pump.
  • FILTRATION : While charging the slurry into the filter, filtrate will start passing through filter cloth by gravity. To enhance filtration rate and to keep filter media clean from initial sedimentation, the agitator can be brought down most position and keep on rotating in forward direction. The cake height can be built up in successive steps.
  • CAKE WASHING : Wash liquids are sprayed into the chamber on cake through a spray ring. The stirrer blades are lowered to agitate the slurry to obtain good cake washing. The wash liquid is sprayed repeatedly though the filter cake by the same driving force as used during the first stage filtration.
  • SMOOTHING AND COMPRESSION : At the closing stage of the filtration process described above, the stirrer blades are lowered on the cake surface. The specially designed hydraulic system, takes over to perform a systematic, efficient and productive smoothing of the cracks which appear in the cake, leaving behind low residual moisture 10to 20% less as compared to other conventional filters. This results in energy saving in drying process at least by 40%.
  • FILTER CAKE DRYING : After the final wash, filtration and compression, the heating medium is fed into the limpet/jacket and the chamber below filter plate as well as Hollow shaft and Hallow Blade .The stirrer blades are lowered and the cake mass is agitated during the drying stage. The vapour can be removed under vacuum applied to the filter. Drying can be enhanced by purging a hot gas through cake.
  • PRODUCT DISCHARGE : The stirrer blades are rotated and lowered to cut away the upper surface off the filter cake. As the blades descend into the cake mass, the discharge value is opened and a controlled discharge of the cake is achieved.

Agitated Nutsche Filter

KEY FEATURES:
Agitated Nutsche Filter Agitator:
  • Hollow agitators made from heavy sections making them suitable for both solids and liquids.
  • Blade design improves mixing, heat transfer and facilitates uniform temperature distribution.
  • Low angle blade profile ensures cake smoothening.
  • Agitators available in both 2 blade and 3 blade design, 3 blade agitators can reduce the drying time by upto 30%

Multipurpose Design:
  • Unique filter plate design allows interchangeability of filter media without changing the base.
  • Flexibility for multiple products and campaigns in the same equipment.

Filter Base:
  • Bayonet type design available as an alternative to C clamp design.

Agitated Nutsche Filter Main Vessel:
  • Designed and manufactured according to ASME Sec. VIII Div. I.

Side Discharge Valve:
  • Hydraulically operated valve with metal to elastomer sealing allows for a pressure tight shut-off after each product discharge
  • Fully automated, sealing surfaces do not require cleaning after each discharge.
  • Specially designed metal to metal sealing is available as an option with self locking arrangement to prevent loss of batch in case of hydraulic failure.

Side Discharge Port:
  • For contained discharge of the product a side discharge port can be provided which can be integrated with an isolator.

Control Panel and Automation:
  • Hydraulic power pack with electrically operated flame proof solenoid valves. Local control panel with electrical and hydraulic safety features.

Stuffing Box:
  • Stuffing boxes accomplish sealing by the radial expansion of a soft, deformable material such as layer-wound rubber, plastic, fiber, or a combination of these. Stuffing boxes are lower in initial cost than mechanical seals but are significantly higher in maintenance expenses.

Mechanical Seal:
  • Mechanical seals are designed to prevent leakage between a rotating shaft and its housing under conditions of extreme pressure, shaft speed and temperature. Mechanical seals can be single acting or double acting. Single (acting) mechanical seals have one sealing gap.

Advantages:
  • The equipment is functionally safe and easy to operate.
  • No manual handling.
  • Through washing of cake.
  • Toxic and hazardous material can be processed.
  • Product purity maintained
  • Blending of product possible before discharging.
  • Complete automation.
  • Combining filtration, washing, re-slurry and drying in a fully enclosed automated unit thus reduction of capital and operating costs.
  • Large quantities can be processed faster than the conventional systems.
  • Heat transfer surface can be provided on the vessel wall by providing jacket or limpet.

Technical Data:
FILTERING AREA m2 WORKING VOLUME m3 CAKE VOLUME m3 DIAMETER mm OVERALL HT. mm
0.125 0.075 0.02 400 2500
0.25 0.150 0.08 500 2500
0.5 0.5 0.17 800 3400
1.0 0.9 0.3 1200 4050
1.6 1.45 0.64 1500 4050
2.0 1.8 0.8 1600 4250
2.5 2.25 1.0 1800 4500
3.0 2.8 1.2 2000 4550
4.0 3.8 1.6 2400 5000
5.0 4.8 2.0 2500 5100
6.3 6.0 3.0 2900 5250
8.0 8.0 4.0 3200 5400
12.5 13.0 6.25 4000 5000




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