revolutionary efficiency improvements in solar evaporation ... .pdf · revolutionary watrix rotary...
TRANSCRIPT
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REVOLUTIONARY ZERO DISCHARGE
TECHNOLOGY Efficiency improvements in Solar evaporation
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HOW DO YOU EVAPORATE THE WATER IN THE GLASS QUICKLY?
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Spill it
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In other words, increase the surface area of the liquid exposed. The water being distributed over a
greater area has each molecule exposed to more incoming air particles. Thus each molecule can
get enough energy to fly off faster rather than waiting for each layer to evaporate, keeping the
layers below trapped (in this case inside the glass)
y y
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HOW TO ACCELERATE EVAPORATION RATE FURTHER?
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ADD A FAN AND INDUCE AIR MOVEMENT NEAR THE SURFACE OF THE LIQUID (For example: clothes dry faster in a windy day)
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The velocity of air on the surface of water can speed evaporation in three ways Fresh Air Moving
• First, it brings in fresh unsaturated air across the water surface . With no air movement the evaporation will stop at one point when the atmosphere gets saturated with water vapor Secondly, it can agitate the water, breaking up the surface tension and still increasing the surface area, exposing more molecules to the atmosphere Thirdly , velocity and pressure have inverse relationship (this is how lift works for airplane). So, as air increases speed across the surface of water, it also lowers pressure locally. The combination of agitation and pressure drop work together to speed up the evaporation
•
• Water Vapor
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HOW THIS PRINCIPLE IS APPLIED IN
EVAPORATION OF INDUSTRIAL
WASTEWATERS CONVENTIONALLY ?
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SOLAR PONDS
Water is spread over a large area to increase the available area for evaporation with natural wind blowing across the surface of the water
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ADVANTAGES AND DISADVANTAGES OF SOLAR POND
Advantages
Operation costs : Nil
Disadvantages
Evaporation rate is very slow, not suitable for high volumes of water
Requires very large area:
1) 2)
limitation in availability of land land costs are prohibitive
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PAN EVAPORATION RATES
Year Bangalore
MM/day
Chennai
MM/day
Kolkatta
MM/day
Nagpur
MM/day
New Delhi
MM/day
Bombay
MM/day
Ahmedabad
MM/day
Srinagar
MM/day
Shillong
MM/day
Trivendrum
MM/day
Jan 3.9 3.1 1.4 4.1 2.2 2.4 6.3 0.0 1.3 3.9
Feb 4.8 4.6 2.6 5.1 4.2 3.3 7.2 0.0 1.9 4.4
Mar 6.1 5.9 4.2 5.4 7.2 4.1 8.8 1.8 3.5 5.0
Apr 5.4 7.1 5.5 6.4 9.9 4.8 9.3 2.6 4.2 4.8
May 5.7 8.1 4.8 7.2 10.9 5.0 12.6 3.0 3.1 4.0
Jun 3.5 7.7 3.7 5.0 10.1 3.7 14.5 5.0 2.7 2.5
July 3.1 5.4 2.5 3.5 4.7 3.0 10.1 5.1 2.2 3.3
Aug 3.2 5.5 2.7 3.3 5.0 2.2 8.5 3.8 2.2 3.9
Sep 3.5 4.8 2.3 3.9 6.1 2.9 9.9 3.6 2.1 4.4
Oct 3.4 4.1 2.5 3.8 5.1 2.8 8.7 1.8 2.1 3.9
Nov 2.9 3.1 1.9 3.6 4.0 2.7 8.1 0.9 1.7 2.9
Dec 3.9 3.0 1.6 2.9 3.5 2.3 7.0 0.0 1.4 3.7
Annual Average 4.1 5.2 3.0 4.5 6.1 3.3 9.3 2.3 2.4 3.9
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SOLAR POND AREA REQUIRED TO EVAPORATE 100 CU.M/DAY
Place Acres Bangalore 6.02 Chennai 4.75 Kolkatta 8.24 Nagpur 5.49 New Delhi 4.05 Bombay 7.49 Ahmedabad 2.65 Srinagar 10.74 Shillong 10.30 Trivendrum 6.33
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HOW TO ACHIEVELARGE SURFACE AREA WATER
WITHOUT ADDITIONAL LAND
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SPREAD THE WATER IN THE ATMOSPHERE AND MIX FORCED AIR WITH IT
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Use an water fracturing equipment capable of breaking the water droplets to micron particles and throw it in the atmosphere with forced air mixing.
This way the surface area of water exposed to air is multiplied by numerous times
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Use an water fracturing equipment capable of breaking the water droplets to micron particles and throw it in the atmosphere with forced air mixing. This way the surface area of water exposed to air is multiplied by numerous times
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THE SURFACE AREA RESULTING FROM SUCH ATOMIZATION OF A LIQUID
IS CONSIDERABLE Figure‐1 shows the surface area of feed after being
atomized into droplets of different sizes
Droplet size [µm]
Figure-1 Total surface area of on litre of feed atomized into different droplet sizes
Effective atomizers create droplet spectra from as low as 50 micron to 150 micron or larger, with a typical operational range between 75 and 110 microns. Based on the above surface area chart, surface area of one litre of water is increased to 50 to 75 square meters and hence the evaporation rate achieved will be tremendous
Surface area [m2]
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ALSO FIND BELOW THE DRIFT TIME OF THESE DROPLETS WHICH WILL
ENHANCE EVAPORATION RATE FURTHER
Comparison of Droplet Fall Rates 3 mph wind
20 micro
ns
100 micro
ns
240 micro
ns
400 micro
ns
Droplet Diameter
20 microns
50 microns
120 microns
150 microns
400 microns
10’
Time to Fall 10 Feet 8 ft 22 ft 48 ft 178 ft 1056 ft 4 min 11 sec 5 sec 2 sec
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Droplet Size to be reduced
Watrix rotary evaporator
Nozzle of Various Sizes
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REVOLUTIONARY WATRIX ROTARY EVAPORATOR
Operation Principle
Step 4: Mixed with high volume of air and thrown into the atmosphere
Step 3: Droplets impacts on a high speed rotary cage and shred into micron particles
Step 2: Water is fractured into droplets at the edge of the rotating hub
Step 1: Feed is centrifugally accelerated and spread out as a thin film over a rotating surface
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STEP 1: FEED IS CENTRIFUGALLY ACCELERATED AND SPREAD OUT AS
A THIN FILM OVER A ROTATING
SURFACE
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STEP 2: WATER IS FRACTURED INTO DROPLETS AT THE EDGE OF
THE ROTATING HUB
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STEP 3: DROPLETS IMPACTS ON A HIGH SPEED ROTARY CAGE AND SHRED INTO
MICRON PARTICLES
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STEP 4: MIXED WITH HIGH VOLUME OF AIR USING A FAN AND THROWN INTO
THE ATMOSPHERE
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REVOLUTIONARY WATRIX ROTARY EVAPORATOR
Operation Principle
3. The thin film of liquid is shred into droplets at the
edge of the rotating wheel. These droplets with high
velocity will next hit a micron level rotary cage screen rotating at high
RPM to further atomize the fluid and create extremely
fine droplets and distributed over the entire screen mesh which creates
superior resistance to clogging and abrasive
4. Droplet size of the spray is controlled by varying the rotating speed of the wheel
and varying the screen mesh size
5. The micron water particles are then
entrained in a conical jet of air induced
through an inbuilt fan, propelling liquid up to 30 meters
or more (100 feet) with droplets from
40 to 250 microns
Fan 2. The feed is centrifugally accelerated in the wheel to a high velocity and spread
out over the rotating surface as a thin film 1. The feed is introduced
to the centre of a rotating wheel
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EVAPORATION BY MECHANICAL FORCE
Watrix rotary evaporators use mechanical centrifugal force to atomize fluids. There are several significant advantages to rotary evaporation that allow Watrix to operate where other evaporation technologies cannot
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SIMPLE INTEGRATED DESIGN
No separate motors for atomizer and fan. Integrated design
This simple design combines the atomization system with the fan delivery system creating a complete, durable unit that can deliver high volumes of atomized liquid in a directed jet of air
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SIMPLE MAINTENANCE
The screen mesh and cup can be easily inspected when the unit is shut down, and worn parts can be quickly replaced to reduce downtime and costs associated with failure
This is an important feature with certain challenging fluids which can erode even the toughest atomizer system
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Nozzles Reservoir with perforated
PVC pipe and gravel cover Fence
Slope 2%
Drainage water from sump
discharge meter
100 ft
100 ft
Water
Coarse Gravel
Area 3A
Coarse Gravel
Area 3B
Mixed Gravel
Area 2A
Mixed Gravel
Area 2B
Exposed liner (no aggregate)
Area 1A
Exposed liner (no aggregate)
Area 1A
Pumps
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MEDIUM COARSE
SMALL
Types of Gravel Evaluated
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Nozzle stand
Area covered by coarse gravel
Area covered by mixed gravel
Exposed liner area
Return flow culvert
Solar Evaporator Test: Evaporative Surfaces
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Test Nozzles
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Nozzle height increases the
evaporation rate is also
Increasing
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Vertically oriented nozzle position with different riser heights
(riser=1.5 ft) note windbreak fence
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riser=1.5 ft
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Nozzle positions with different angles and with varying riser heights were tested
in 2003 (riser=1.0 ft)
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Nozzle riser= 1.0ft,
Nozzle riser= 1.5 ft,
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0
Nozzles raised at 0.5 ft
Total salt deposition 5.9 kg/day (09/20/2004)
70
60
50
South 40
30
20 So lar Evapora
tor
(3 0x30 meters or 10 0x100 fee t)
10
North
Salt Deposition, mg/m2/hour
South
Sola r E vap orator (30x30 meters or 100 x10 0 feet)
North
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Salt Deposition,
mg/m2/hour
Nozzles raised at 1.5 ft
Total salt deposition 10.4 kg/day (08/02/2004)
South
180
160
140
120
100
80
60
40
20
0
Solar Evapor ator (30x30 meter s or
100x100 feet)
North
South
Solar Evapora tor
(30x30 mete rs
or
100x100 f eet)
North
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Nozzles raised at 2.0 ft
Total salt deposition 22.4
kg/day
(09/07/2004) test 2 60
55
50
45
40
35
30
25
20
15
10
5
South
Solar Ev apor ator
(30 x 30 me ter s or 100x 10 0 fee t)
0 North Salt Deposition,
mg/m2/hour
South
Solar Ev apo rat or ( 30x 30 m eter s or 100 x 100 f eet)
North
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Protection from Rain
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Pond Size: 50 m x 30 m (1500 sqmts)
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APPLICATIONS
Refineries Evaporator rejects Power plants Oil mills Oil and gas
RO rejects Steel industries Fertiliser plants Sugar industries Pharmaceuticals Textile industries
Mining industries DM plant & softener regeneration wastes
Automobile and ancilleries
Distilleries and breweries
Food processing industries
Sea food processing industries
Cooling tower blowdowns
Poultry Slaughter houses Dairy Sewage
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Acknowledgement: Watrix Corporation-
Mr.Meenakshisundaram
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Thank you