Ion-exchange parallel-flow filters (FIPa)

Ion-exchange parallel-flow filters (FIPa) are intended for use in the water treatment systems to obtain softened and demineralized water at central heating and power plants, industrial and heating boiler plants.

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Filter description: The ion-exchange parallel-flow filter (FIPa) is intended for elimination of hardness cations (Ca2+ and Mg2+) from the incoming flow in the process of sodium-hydrogen cycle as well as elimination of sulphate, chloride, and nitrate anions in the process of natural waters demineralization. Produced softened and primary demineralized water is usually used as make-up water for steam boilers (low, medium, high pressure steam generation), hot water boilers, heat supply system. Less often the water coming after ion-exchange cleaning is used in various industrial processes.

Ion-exchange parallel-flow filters (FIPa)Ion-exchange parallel-flow filters (FIPa)

Natural and human-made ion exchange resins (cation exchange resins and anion exchange resins) are used as the filtering medium in the ion exchange filters.

 

Design description: Ion-exchange parallel-flow filters (FIPa) consist of:
  • vessel;
  • top and bottom distribution assemblies;
  • piping;
  • shut-off valves;
  • sampling station.
 
 

FIPa filter has cylindrical vessel made of welded sheet steel and equipped with welded elliptical pressed bottoms. Three supporting elements are welded to the lower bottom to enable filter mounting onto the foundation.
Upper and lower bottoms have centrally welded flanges for external connection of piping and internal connection of distribution assemblies (bottom and top).

 
 
Operation principle: FIPa filter cycle includes following stages:
  • softening or demineralization (filtration);
  • loosening;
  • regeneration;
  • backwash;
  • discharge of the primary permeate water before it is put in the circuit.
 

 
Pressurized incoming water under pressure is supplied to the top collection and distribution assembly of FIPa filter, uniformly distributed and passes through the filtering medium layer in the downward direction. The permeate water is discharged through the bottom collection and distribution assembly from the vessel to the collecting receiver.
 
During the water treatment (primary FIPa filter) and final treatment (secondary FIPa treatment) dissolved ionic impurities removal is performed by exchange of metals' cations (acid residues' anions) to the equivalent number of Na+ or Н+ cations (Сl- or ОН- anions) that takes place at the cation or anion exchange resin beads. When the filter cycle is over the filter is shut-off and disconnected from the process receiver. Then the loosening of ion exchange resin is carried out to avoid material packing. After loosening the regeneration process is performed.
 
FIPa filter operation cycle is finished when the rated normal breakthrough of cation (anion) exchange resins is detected, in other words, when ion-exchange capacity is exhausted, or in case of outlet-inlet pressure differential is more than 0.3 Mpa.
 
For regeneration of ion exchange resin the ready-made regenerating solution (10-15% sodium chloride solution for sodium cycle or 1-5% sulphur acid solution for hydrogen cycle, 3-5% NaOH cycle for anion exchange) is supplied from above to FIPa filter. When certain volume of regeneration solution has been supplied, its supply is shut off and softened or demineralized (treated) water comes to backwash ion exchange resin. The backwash water is discharged to the drainage (or storage tank for re-use). When the backwash is complete and the ion exchange resin capacity is regenerated the filter is put in operation or kept in standby mode. Right after the filter is put in operation the first volume of permeate water is discharged to the drainage for analytical monitoring. When the set parameters of the permeate water are achieved, FIPa filter is connected to the treated water receiver.
 
The filters' operation includes regeneration of ion exchange capacity by means of regeneration solutions, that's why these filters require additional service equipment to prepare the preliminary regeneration solution. This equipment includes the hydrodynamic mixer, tank for sodium chloride dissolving or acid (caustic) gauging tank, as well as dosing pumps or water jet pumps installed at sodium chloride or reagent station.
 
 
Product line and specifications of ion exchange parallel-flow filters (FIPa)

 

Filter type
Diameter, mm
Filter capacity m3/hour
Operating pressure,
MPa
Height, mm
Filter weight*, kg
FIPa I 1,0-0,6
1000
16
0,6
3970
1450
FIPa I 1,4-0,6
1400
32
0,6
4050
2000
FIPa I 1,5-0,6
1500
36
0,6
4050
2200
FIPa I 2,0-0,6
2000
65
0,6
4860
3950
FIPa I 2,6-0,6
2600
110
0,6
5100
6300
FIPa I 3,0-0,6
3000
148
0,6
5300
7550
FIPa I 3,4-0,6 3400 220 0,6 5395 9600
FIPa II 1,0-0,6
1000
36
0,6
2990
1220 
FIPa II 1,4-0,6
1400
70
0,6
3270
1800
FIPa II 1,5-0,6
1500
80
0,6
3325
2000
FIPa II 2,0-0,6
2000
140
0,6
3710
3250
FIPa II 2,6-0,6
2600
240
0,6
4200
4840
FIPa II 3,0-0,6
3000
320
0,6
4450
6800
FIPa II 3,4-0,6 3400 390 0,6 4500 8740

 

 

*Indicated filter weights correspond to filters of "false bottom" type with applied corrosion preventive coating (that includes the flange connector, DN 1.0-1.5 m, at filters' vessel).

 

Our filters are manufactured in compliance with TU 3113-003-04688393-05 "Water-treatment filters for heat and power plants and industrial energy sector", efficient from July 1st, 2005.

 

To learn more about FIPa ion exchange filter, please, phone us: +7 (8482) 20-83-61, 20-85-90 or write to our e-mail: info@teko-filter.ru.