Automatic disc filters series HF-A

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Automatic disc filters series HF-A
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Automatic disc filters series HF-A

One of the types of mechanical filters designed to clean water from insoluble impurities is disk filters. These devices are widely used in everyday life, industry and agriculture, replacing mesh filters previously used for mechanical water treatment. Compared to them, disk filters are characterized by higher performance and mud capacity of the filter element.

 

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Description

Scope of application

Disk filters are widely used in the field. Agricultural industry, desalination such as metallurgy, electronics and plants, drinking water treatment, oil refining, gas and chemical industry, industrial water, etc.

Application area FilteringPrecision
Getting pre drinking water 20μ
Production of process water for spraying equipment (nozzles,drip irrigation, etc.) 50μ
Closed loop water filtration 100/130μ
Secondary wastewater treatment 200μ

 

Principle of action

Disc water treatment devices are equipped with a special filter element. It is a block consisting of a set of relief polymer disk rings, which, when compressed, form a three-dimensional mesh structure that holds particles solvent free in water. At the same time, the area of the working surface of the block (cartridge) corresponds to the total area of all disk rings in the package.

This makes the cleaning device more compact while increasing cleaning efficiency.

the filtering area:

2 inch unit (2 inch) -1600 cm²;

3 inch unit (3 inch) -1600 cm²;

4 inch unit (4 inch) -3200 cm²;

In filtration (Service) mode, water passes through tightly compressed disks (from the outside inside), and dissolved particles remain in the interdisk space.
The filter is washed (cleaned) automatically by changing the direction of the water flow to the opposite (back flush).
The reverse flow is supplied under pressure, the disks are moved, the gap in the interdisk space increases, as a result of which all previously detained particles are discharged into the sewer. As a rule, washing of each filter unit takes about 10 seconds.
During this period of time, between 33 and 35 litres of water are discharged into drainage.
On average, the consumption of water for own needs per unit of production can be up to 0.2% of its capacity.

Design features

In the system of disk water filters, energy consuming elements are represented by electromagnetic valves (power consumption up to 8 W), as well as by a control controller (power consumption up to 100 W).

The operation of the filter is controlled by a programmable logic controller, which initiates the flushing of the filter by signals from various sensors.

 

For example

Signal from the differential pressure relay when the pressure difference is exceeded at the inlet and exit of the filter (usually with a difference of 0.5-0.7 bar);

By command of a timer with a predetermined time interval determined empirically for each system and operating conditions;

By signal from an external sensor;

More advanced controllers allow you to use any of the above events available for programming.

Disc filter enclosures are made of fiberglass reinforced polyamide (PA), and disk filter elements (rings) are made of strong and light polymer-polypropylene (PP).

These materials are not subject to corrosion, do not react with chemically aggressive substances, and are also resistant to temperature changes.

Chemically resistant models of disk water filters can be used with seawater.

 

Advantages of disk filters

Simple design.

Wide range of applications.

Wide range of performance at compact sizes (from 6 to 300 m ³/ h).

Subtlety of cleaning from 20 to 200 μm.

Possibility of use in complex water treatment systems.

Fast manual or automatic flushing.

Chemical resistant materials.

Does not require consumables.

Maintenance does not require large material costs.

High strength characteristics with low weight.

Long service life.

 

Optimum operating conditionsfor disc filters are:

minimum filter inlet pressure                  2 bar;

maximum pressure                                     8 bar;

maximum temperature                              ≤60 °C;

pH range                                                       4-13

 

The disc filter elements are color-coded to indicate the acceptable filtration level (screening threshold). A palette of five colors is used. For the finest cleaning (up to 20 microns), a gray filter disc element is used. Then in ascending order:

Recommendations for choosing a disc filter

Depending on the degree of contamination of water, it can be classified into:

Water of class 1 (Relatively clean) – water used for urban water supply.

Water class 2 (Slightly polluted) – water taken from open sources of good quality water supply; circulating cooling circuits; well water from artesian sources; water that has passed the settling stage with coagulation, etc.

Class 3 water (Polluted) – well water from aquifers of medium quality; waste water that has undergone biological treatment; water from open water sources with a lot of bacteria, etc.

Water class 4 (Dirty) – water with a high content of iron and manganese; water from land sources of poor quality; polluted water as a result of floods, floods; waste water that has not passed the stage of biological treatment

 

 

Specifications
Water quality Conditionally clean Slightly polluted Polluted Dirty
Filtration rate 200 µm 100 µm 50 µm 200 µm 100 µm 50 µm 200 µm 100 µm 50 µm 200 µm 100 µm 50 µm
Model Maximum pressure m3 / h Maximum pressure m3 / h Maximum pressure m3 / h Maximum pressure m3 / h
HF 2-2 ≤38 ≤30 ≤22 29≤ ≤22 ≤18 ≤21 ≤15 ≤13 ≤13 ≤10 ≤8
HF 2-3 57 45 33 43 33 26 31 22 18 18 14 10
HF 2-4 76 60 44 57 44 35 41 30 24 25 19 14
HF 2-5 95 75 55 72 55 44 51 37 30 31 23 17
HF 2-6 114 90 66 86 66 53 62 45 36 37 28 21
HF 3-3 111 90 60 84 66 48 60 45 33 36 28 19
HF 3-4 148 120 80 112 88 64 80 60 44 48 37 26
HF 3-5 185 150 100 140 110 80 100 75 55 60 47 32
HF 3-6 222 180 120 168 132 96 120 75 66 75 56 39
HF 3-7 259 210 140 194 154 112 140 105 77 84 66 45
HF 3-8 296 240 160 224 176 128 160 120 88 96 75 52
HF 3-9 270 180 180 252 198 144 180 135 99 108 85 58
HF 3-10 370 300 200 280 210 160 200 150 110 120 94 65
HF 4-3 224 176 128 168 129 102 120 88 70 72 55 40
HF 4-4 280 210 160 210 154 128 150 105 88 90 60 51
HF 4-5 374 294 214 281 216 171 200 147 118 120 91 68
HF 4-6 448 352 256 336 254 205 81 176 141 144 109 81
HF 4-7 522 410 298 392 301 238 280 109 164 168 127 94
HF 4-8 597 469 341 448 344 273 320 234 188 192 146 108