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Nutsche filters & filter-dryers chemical

Nutsche Filters & Filter-Dryers Chemical

Pressofiltro® Series PF 2000 - PF 14000 Chemical design

Chemical design Pressofiltro® agitated Nutsche filters, suction filters or filter dryers are versatile units equally suited for monoproduction applications and for multipurpose production facilities. 

Big filters are available with manhole access. Smaller filters are available with submersible filter base to provide for good access to the filter internals to change the filter cloth. 

Available as closed units with manhole access or with an openable filter base to provide for good access to the filter internals to change the filter cloth, for cleaning as well as for inspection purposes. Interchangeable filter plates, with flat, homogeneous filter surfaces for good cleanability and inspection. Multilayer and/or conventional filter materials.

Good drying performance with special agitator design, large heat exchange areas.

 

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Inerting

Prior to feeding slurry into the agitated Nutsche filter or filter dryer the vessel interior is inerted by a controlled displacement of the oxygen containing atmosphere with Nitrogen. This procedure prevents the potential formation of an explosive atmosphere in the vessel interior.

Filling

Afbeelding: pf100-6000 filling

After inertization is completed the slurry is fed into the vessel.

Filtration

filtration

The slurry is filtered by pressurizing the vessel interior using Nitrogen and/or evacuating the area underneath the filter plate. Solids are retained by the filter cloth whereas the mother liquor passes thru the filter cake forming and thru the filter cloth and is discharged from the area underneath the filter plate.

Washing

Afbeelding: pf100-6000 washing

Once the mother liquor has been filtered off the cake washing step is initiated. 

Prior to displacement washing the filter cake surface is smoothed using the agitator to prevent cracks in the filter cake.

The washing liquid is evenly distributed over the entire filter cake surface using a wash ring with spray nozzles. By again pressurizing the vessel interior the washing liquid is forced thru the filter cake, displacing any remaining mother liquor and is discharged the same way as the mother liquor during the filtration.


In the reslurry washing process the washing liquid is added to the vessel and mixed with the filter cake using the agitator. By again pressurizing the vessel interior the washing liquid is forced thru the filter cake, displacing any remaining mother liquor and is discharged the same way as the mother liquor during the filtration.

Drying

Afbeelding: pf100-6000 drying

After completion of the washing process the drying process is initiated. For efficient drying the filter dryer is typically evacuated in steps and heated up at the same time. During the drying process the product is agitated. The filter dryer is maintained under vacuum and at the maximum allowable temperature for the product until the final required product humidity level is reached.

Cooling

Afbeelding: pf100-6000 cooling

After drying is completed the product is cooled down prior to discharging.

Discharging

Afbeelding: pf100-6000 discharging

The dried and cooled product is discharged thru the side discharge valve. The product is transported to the discharge valve using the agitator.

Cleaning

Afbeelding: pf100-6000 cleaning

Using spray balls a cleaning fluid is sprayed onto all product wetted internal surfaces for the internal cleaning of the equipment in between individual batches or for product change over. This provides for full and efficient cleaning of the filter dryer interior.

Technical data

Special properties for the customer’s benefit:

  • calculation, design and manufacture in compliance with Pressure Equipment Directive 97/23/EG or/and ASME pressure vessel code, Section VIII, with U-stamp
  • EG type examination certification 03ATEX0246X in accord with PED 94/9/EG or with UL-approved electrical components for operations in class 1, division 1 or 2, group C & D environment
  • shaft seal through stuffing box (compression gland), externally interchangeable
  • sampler valve
  • hydraulic pre-piping, pre-wiring on terminal box


Options:

  • double mechanical seal and bellows, double-acting mechanical seal, dry running contact or non contacting gas-lubricated (lift-off) or liquid-lubricated seals, externally interchangeable
  • metallic sealing discharge valve
  • openable filter bottom, with conventional C-clamps or bayonet locking system
  • autonomic PLC control or connected to PMSX

Technical data

Dryer
type
 		 Internal
Ø
mm		 Filter area
m²
 		 Nominal volume
l
 		 Cake volume
max.
l		 Speed
max.
1/min		 Drive
kw
PF 2000 1600 2.0 2000 1000 30 18.5
PF 2500 1800 2.5 2500 1250 25 18.5
PF 3000 1960 3.0 3000 1500 25 22
PF 4000 2260 4.0 4000 2000 21 22
PF 5000 2535 5.0 5000 2500 18 30
PF 6000 2765 6.0 6000 3000 17 30
PF 7000 3000 7.0 7000 3500 16 37
PF 8000 3190 8.0 8000 4000 15 37
PF 9000 3390 9.0 9000 4500 15 45
PF 10000 3570 10.0 10000 5000 14 45
PF 12000 3910 12.0 12000 6000 12 55
PF 14000 4330 14.0 14000 7000 11 75
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Fields of application
Chemical
Chemical
Fine chemicals
Fine chemicals