Cake Washing
Wash liquid is 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 through the filter cake.
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The Agitated Nutsche filter Dryer (ANFD) is a Nutsche type filter designed to separate solids from liquids under controlled conditions. It is totally enclosed and is normally operated under pressure or under vacuum. Additionally, the equipment is fitted with a stirrer mechanism which efficiently agitates the slurry during cake washing, smoothens and squeezes the cake during filtration and assists in the automatic discharge of the cake. The ANFD comprises of a pressure vessel in which a main shaft rotates and also moves in the vertical direction. Specially designed stirrer blades are mounted on the shaft, capable of performing various functions. A side discharge arrangement is provided, closing and opening through hydraulic / mechanical means. A filter plate is located at the base of the vessel in level with the discharge port to facilitate maximum cake removal. The filter medium, usually a filter cloth, is fitted on the filter plate which is replaceable type. A multilayered filter plate construction can also be provided for filtration instead of filter cloth. In addition a special design of interchangeable arrangement between filter cloth and multilayered sintered plate can be provided in the same equipment.
CHARGING:
Slurry is charged into filter preferably by gravity flow from reactor installed above the filter or by slurry pump. Pressure balance line is kept open to avoid cloth ballooning.
Wash liquid is 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 through the filter cake.
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 10 to 20% less as compared to other conventional filters. This results in energy saving in drying process at least by 40%.
After the final wash, filtration and compression, the heating medium is fed into the limpet / jacket on shell and the chamber below filter plate as well as Hollow Shaft and Hollow Blades. The stirrer blades are lowered and the cake mass is agitated during the drying stage. The vapor is removed under vacuum applied to the filter through dust catcher. Drying can be enhanced by purging a hot gas through cake.
The stirrer blades are rotated and lowered to cut away the upper surface off the filter cake. As the blad
MATERIAL OF CONSTRUCTION:
Stainless steel, Alloy C-276, Alloy C-22, Alloy C, Monel, Titanium,
Mild steel, Rubber Lining, FRP Lining
SHAFTSEALS:
1) Wet & Dry Mechanical Seals with metallic bellow.
2) Packed gland type stuffing box with antifriction Bearing.
FILTER MEDIA:
1) Metallic Screens.
2) Multilayered Sintered wire mesh.
3) Filter cloth Natural or Synthetic fiber
1) A trouble free and easy maintenance Hydraulic system for up/down movement of shaft, bottom bed and open/close of discharge valve.
2) The discharge valve is specially designed for leak proof operation and automatic cake discharge.
3) Non-bolted quick detachable bottom designs facilitate easy cleaning, quick changing of filter media, recommended for various products processing. The bottom bed is trolley mounted for easy movement.
4) Limit Switches - to limit up and down movement of shaft, bottom bed and open/close of discharge valve.
5) Control Panel - Flame proof or as required. Complete PLC -HMI/SCADA based control panel can also be provided.
1.Isolater Compatible
ANFD's are available in variants compatible with barrier isolation systems at the discharge. This allows handling of Cytotoxic/ Potent products with operator safety. Additionally, these can be combined with automatic packing systems further downline. Also lab scale ANFD models are available for R&D purposes.
2. Sterile Construction
Sterile application ANFD models with completely automated SIP/CIP & operation cycles, sintered cartridge filter media, metal to metal sealing are also available.
3. Special Heel removal discharge valve 2
A specially designed quick openable discharge valve which allows much closer access to interior of machine for heel removal is also available
4. Special Quick detachable designs for bottom
a) Super ‘C’ Bayonet
This design is similar to a TC clamp design but hydraulic operated. This facilitates easy and fast bottom bed detachment for filter cloth & product change over. This design is good for vacuum and very low pressure application
b) Teethed Bayonet
This design has teethed body flanges, which are hydraulic operated and this is a ‘Positive Locking’ design. It facilitates easy and fast bottom bed detachment for filter cloth & product change over. This design is good for vacuum as well as high pressure applications.
Slurry is charged into filter preferably by gravity flow from reactor installed above the filter or by slurry pump. Vacuum is then applied in the filtrate receiver which is connected to the filtrate discharge nozzle.
WASHING BY SPRAYING SUCKED OUT. WASH LIQUOR AND CAKE DEPOSITED RESLURRING. ON FILTER BED
Mother liquor is sucked through the filter bed and collected in the receiver, which is below the level of lower compartment of the filter, and slowly cake formation begins on the filter media. When most of the filtrate is sucked out, the cake is deposited on the filter bed.
WASHING BY SPRAYING WASH LIQUOR AND RESLURRING
If necessary, after first filtration, wash liquor can be sprayed on filter bed and cake can be reslurried by manipulation of agitator movement. Filtration can be then repeated. As many washing as necessary can be done till cake is free from all impurities and the quality is within acceptable limits.
3. Special Heel removal discharge valve 2
A specially designed quick openable discharge valve which allows much closer access to interior of machine for heel removal is also available
4. Special Quick detachable designs for bottom
a) Super ‘C’ Bayonet
This design is similar to a TC clamp design but hydraulic operated. This facilitates easy and fast bottom bed detachment for filter cloth & product change over. This design is good for vacuum and very low pressure application
b) Teethed Bayonet
This desigTn has teethed body flanges, which are hydraulic operated and this is a ‘Positive Locking’ design. It facilitates easy and fast bottom bed detachment for filter cloth & product change over. This design is good for vacuum as well as high pressure applications.
