Automatic backwash filters SS Micron Screen
The debris laden dirty fluid enters the strainer's large bottom chamber where the line
velocity gets reduced. Flow continues upward passing in a radial manner through the
"sealed" screen element.
Unwanted materials are trapped on the inside of the filter element screen. The fluid keeps
getting filtered and comes out clean through the outlet nozzle. As the filter screen gets
loaded with dirt, the differential pressure keep raising.
There is hollow full flow backwash arm extending the full length of the filter element.
This can rotate and is piped to atmosphere through a backwash valve.
When the differential pressure crosses the pre-set limits. The backwash valve opens the
system to atmosphere causing a high velocity reverse flow across the isolated section of
screen. Dirt and debris are flushed out from this segment of the screen into the backwash
arm and out of the strainer via the backwash piping.
During the backwashing cycle the main flow is uninterrupted and continues to be strained in
the normal manner. The control system would automatically close the backwash valve after
the screen is cleaned.
These units can also be operated manually from the control panel or in continuous backwash
mode.
Application Fields
Power Plants : Treatment of Industrial Water for cooling generators and filtration of
sealing water to increase the service life of the Turbine Shaft sliding-ring seals in
Hydro-Electric Power Stations.
Steel Industry: Protection of nozzles and pumps during high-pressure descaling, water
treatment for blast furnaces, rolling mills, cleaning, quenching applications.
Chemical Industry : Improvement of product quality by filtering process media. Filtration
of White water, Black Liquor, Starch, Fuel oils, Caustic Solutions, Cooking oils,
brackish/salt intake water etc. For filtration of water used for cooling, process, fire
protection applications.
Pulp & Paper Industry : Removal of fibers from white water filtrate, Protection of spray
nozzles for screens of paper making machines. This reduces frequent failures caused due to
clogging and wear.
Mining: By filtering underground, spray water of even quality is assured. This results in
more reliable operation of pumps and disc cutting machines
Environmental Technology. Used as pre-filters before waste water treatment plants, UV
Treatment, Reverse Osmosis, membrane filtration etc.
Sewage Treatment Plants : During Production of industrial water, filtration of a take off
of the clear run can be used to save valuable drinking or well water.
Heat Transfer / Heat Supply : Protects heat Exchangers from clogging & wear
Chracteristics of SS multi-cartridge automatic backwash filter
a.it is usually used in large flow rate water with high filtration degree ,such as 50-100 micros.
b.there will be 5 to 20 or more pcs SS filter cartridges inside the filter.
c.after one day working,all filter cartridges will be backwashed by setted parameters or pressure control.
the particles which intercepted and accumulated on cartridge will be washed away.
during backwash processing,drain valve will open and particles will be outfall .
for example,backwash time for each cartdiegs will last 10 to 20 seconds.
if there are 10 pcs of SS cartridge ,backwash time will be 220 to 240 seconds.
d. after backwash,the filter will come to next filter period(usually it is 24 hours).
e.you could set the backwash circle as per practical requirement,such as twice or 3 times every 24 hours.
Working procedures:
Backwashing water filters are large tank-style filters that get their name from the fact that they clean and renew themselves by backwashing. Backwashing consists of reversing the flow of water so that it enters from the bottom of the filter bed, lifts and rinses the bed, then exits through the top of the filter tank.
The filter bed itself is a granular substance that is usually referred to as the filter medium. Media (media is plural, medium is singular) are numerous and varied. Common media are granular carbon, sand, garnet, anthracite, zeolite, granular manganese dioxide, and greensand.
The unfiltered water enters from the left and is routed by the control valve into the filter tank. The water then filters slowly through the medium until it reaches the bottom of the tank where it is collected through a specially-designed sieved "basket" at the bottom of the center tube seen in the picture. The filtered water then passes up through the center tube, called a "riser" or a "dip tube," passes through the control valve, and exits the right side of the filter.
Important parts for filtration system:
01. Carbon steel cycloner,
02. Stainless screen,
03. Butterfly valve
04. Sewage device, etc.
| Model |
Flow
(T/h) |
Inlet and outlet diameter
(mm) |
Drainage diameter
(mm) |
D
(mm) |
H
(mm) |
H1
(mm) |
H2
(mm) |
| YLF-50 |
70 |
DN50 |
DN50 |
300 |
1690 |
265 |
640 |
| YLF-80 |
80 |
DN80 |
DN50 |
350 |
1720 |
265 |
660 |
| YLF-100 |
120 |
DN100 |
DN50 |
400 |
1760 |
265 |
680 |
| YLF-200 |
200 |
DN200 |
DN80 |
500 |
1860 |
290 |
715 |
| YLF-250 |
280 |
DN250 |
DN80 |
600 |
1930 |
290 |
755 |
| YLF-300 |
450 |
DN300 |
DN100 |
700 |
2040 |
335 |
755 |
| YLF-350 |
600 |
DN350 |
DN100 |
800 |
2105 |
335 |
770 |
| YLF-400 |
800 |
DN400 |
DN100 |
1000 |
2220 |
335 |
800 |
| YLF-500 |
1000 |
DN500 |
DN100 |
1200 |
2360 |
365 |
825 |
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