Agiated Nutsche Filter Dryer (ANFD) – Sri Hanuman Engineering Works

AGIATED NUTSCHE FILTER DRYER(ANFD)

This is a combination of Filter and Dryer unit in single equipment to achieve economy in process and energy thereby improving profitability. This equipment can be used in manufacturing process of various Pharmaceutical and Food Products, Chemicals, Agro Chemicals, Pesticides, Insecticides, Dyes and Intermediates. It is also available for Sterile applications

THE EQUIPMENT

The Agitated Nutsche filter 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 filter dryer.


Model No.	SHEW ANFD – 1	SHEW ANFD – 2	SHEW ANFD – 3	SHEW ANFD – 4	SHEW ANFD – 5	SHEW ANFD – 6	SHEW ANFD – 7	SHEW ANFD – 8	SHEW ANFD – 9	SHEW ANFD – 10	SHEW ANFD – 11
Working Capacity(Lits)	100	200	500	1000	2000	3000	4000	5000	6000	8000	10000
Filtration Area(M2)	0.3	0.29	0.79	1.02	2.01	3.02	4.02	5.01	6.02	8.01	10.02
Agiator(R.P.M)	12	12	10	10	8to10	8to10	8to9	8to9	6to8	6to8	6to8
Main Motor(H.P.)	2	3	5	5	7.5	10	12.5	20	25	30	30
Power Pack(H.P.)	1	1	1	1	1	2	2	2	2	2	2
Vertical Stroke(mm)	200	200	300	300	300	300	350	350	400	400	400
Cake Capacity(Lits)	40	55	230	330	600	940	1450	1700	2450	3200	4050
A(mm)	500	600	1000	1200	1600	2000	2300	2500	2800	3200	3600
B(mm)	600	700	800	1000	1000	1000	1000	1000	1000	1100	1200
C(mm)	2600	3000	3300	3800	4200	4400	4600	4700	4800	5000	5300

Operations

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.

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 to its down most position and to be kept on rotating in forward direction. The cake height can be built up in successive step.

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.

Smoothing & 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 10 to 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 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.

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 valve is opened and a controlled discharge of the cake is achieved.

Salient Features

Method of operation is totally enclosed. These conditions are excellent for contamination free operations maintaining purity and hygiene. Also solvent recovery, handling of toxic and hazardous materials without human intervention is easily achieved.
Designed and Manufactured to suit critical hygienic conditions of pharma and food industries. (cGMP MODEL)
Detachable bottom is operated by hydraulic cylinders and held tightly with zero leakage.
Offered in a wide range of filtration area capacities upto 15.5 sq. mtrs. (4.5 mt. dia) of catalysts.
The filtration process is very fast.
Significant squeezing of filter cake is possible, thereby resulting in considerably lower residual moisture in the cake, resulting in reduction in energy requirement for drying of filter cake by upto 40 percent depending on cake characteristics.
Enables easy, non-manual and automatic cake / solid discharge. Scraper blade can be provided to scrap the material which may stay on shell.
The unit is designed with minimum maintenance features.
Hollow Shaft and Hollow Blades for thorough drying.
Specially designed tank cleaning CIP nozzles provided for thorough cleaning of inside of filter body.
Metal to metal sealing discharge valve design available
Special Online sampling valve available to take samples without stopping the equipment or releasing vacuum/pressure.
Hinged type quick openable discharge valve cover provided.
Has high batch handling capacities when compared with centrifuges & VTD’s. This helps reduce batch to batch variations, product handling & contamination drastically.
The equipment can perform as reactor-crystaliizer, also in presence of catalysts.