4.5 Process description
The Polydos preparation system works fully automatic. It prepares
the polymer solution in a combination of continuous preparation and
batch preparation.
L1
PE
D7
D8
D9
H
2
O
L2
L3
L4
TM071318
Fig.
Functional principal
Pos.
Description
PE
Polymer
H
2
O
Service water
D7
Mixing chamber
D8
Maturing chamber
D9
Storage chamber
L1
Overflow alarm level
L2
Max. filling level
L3
Min. filling level
L4
Dry run alarm level
The polymer solution is prepared in a three-chamber tank. The
mixing, maturing and withdrawal of the polymer solution runs as a
continuous process.
The preparation process starts automatically when the level sensor
in the storage chamber detects the minimum filling level (L3). The
solenoid valve at the water inlet opens and the preparation water
starts flowing into the mixing chamber.
If dry polymer is used, the dry-material feeder starts dosing the
dry material into the dissolving hopper with jet mixer, where it is
wetted with a part of the preparation water and flushed into the
mixing chamber.
If liquid polymer is used, the liquid-concentrate pump starts dosing
the liquid concentrate directly into the mixing chamber.
The polymer is dosed in proportion to the dilution water flow. This
guarantees an accurate concentration of the prepared solution even
in case of fluctuating water pressure.
The mixed solution flows from the mixing chamber through a
hydraulic displacement channel to the bottom of the maturing
chamber and displaces the matured solution into the storage
chamber. The hydraulic displacement prevents fresh polymer from
entering the storage chamber.
The stirrer in the maturing chamber stops during the preparation
process to ensure that only matured solution is displaced into the
storage chamber.
The preparation process stops automatically when the level sensor
in the storage chamber detects the maximum filling level (L2). The
solenoid valve at the water inlet closes. The stirrer in the maturing
chamber starts again.
5. Technical data
5.1 Ambient conditions for Polydos 412E systems
Min./max. ambient temperature [°C]
-5 / +50
Transport with lifting eyes
-5 / +40
Storage
-5 / +50
Operation
+5 / +40
Max. relative humidity (non-condensing)
80 %
Max. altitude above sea level [m]
1000
*
The system must be drained. For storage temperatures
below +5 °C, the whole system including lines and external
components must not contain any water.
Exposure to direct sunlight can cause colour changes,
material deformations and cracks.
Do not expose the system to direct sunlight.
The system must not be transported at temperatures
below the specified value for transport. Otherwise, plastic
parts may be damaged.
Freezing and boiling liquids can cause damage.
Observe the freezing and boiling points of the used
liquids. The freezing and boiling point of a liquid varies
depending on the pressure.
5.2 General data for Polydos 412E
Type
designation:
PD412E
-500 -1000 -2000 -4000 -6000 -10.000
Max. preparation
capacity with
standard maturing
time [l/h]
500
1000
2000
4000
6000
10000
Standard
maturing
time [min]
45
45
45
45
45
45
Tank volume [l]
600
1050
1750
3500
5400
8700
Solution
concentration [%]
0.05
- 0.5
0.05 -
0.5
0.05 -
0.5
0.05 -
0.5
0.05 -
0.5
0.05 -
0.5
Hydraulic connections
Type
designation:
PD412E
-500
-1000 -2000 -4000
-6000
-10.000
Water inlet
R 3/4 R 3/4
R 1
R 1
1/2
R 1
1/2
R 2
Drain
connection
DN
32
DN 32 DN 32 DN 32
DN 32
DN 32
Overflow outlet
DN
50
DN 50 DN 50 DN 65
DN 65
DN 80
Withdrawal
connection
DN
50
DN 50 DN 50 DN 65
DN 65
DN 80
Liquid-
concentrate
inlet
DN
15
DN 15 DN 15 DN 15
DN 15
DN 15
12
English (GB)
