postch frederic - sawea · 2013. 2. 9. · title: microsoft powerpoint - postch_frederic author:...
TRANSCRIPT
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1Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Essential Expertise for Water, Energy and Air
Environmental Sustainability through the use of Nalco 3D TRASAR Technology for Sea
Water Cooling tower
Water Arabia Bahrain Feb 2011
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2Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Sustainability
Lasting environmental performance improvements generate economic and social benefits.
• Asset Reliability and Protection
• Production Efficiency• Process Throughput• Process Improvement• Health, Safety and Env.
Compliance• Consistent cost focus Financial Performance
Revenue/ Capital
Standards Compliance
Voluntary Mandatory / License to operate
Resource Management
Renewable/Non-Renewable
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3Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Nalco is Uniquely Positioned to Improve Sustainability
• Providing customers with solutions that are technically, economically and environmentally sustainable has been integral to Nalco’s business offerings since our founding in 1928 and explicit in our mission for many years.
• A recent example for cooling systems:
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4Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Sea Water Cooling Towers
• Key reasons to install a sea water cooling tower:– Reduce water make up and discharge flows– Reduce thermal discharge pollution
• Seawater cooling towers are normally operated at 1.2 – 1.6 cycles because a significant reduction of water consumption occurs in this cycle range providing important savings in pumping costs of 2-4 $cents/m3 ( based on pump efficiency, power costs, suction and discharge pressures ).
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5Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Low Stress Causes:
• High water usage because of low cycles of concentration
– High make-up water consumption– High blow-down losses
• High energy usage– Increased pumping costs etc– Larger CO2 Footprint
• High treatment chemical usage– Compliance considerations– Excessive treatment costs
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6Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Excessively High Stress Causes:
• Corrosion
• Scale
• Deposition/Fouling
• Microbiological Growth
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7Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Optimize Stress, Minimize Cost and Environmental Impact
Environmental Impact/Total
Cost of Operation
(TCO) System Stress
Minimum TCO & Env Impact
High Stress = operational problems
Low Stress = high operating costs
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8Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Parameter Value Remarks
Cycles of Concentration
1.2 – 1.6/1.7* Operation at >1.5 requires advanced scale control
Alkalinity 200 - 225 ppm maxas CaCO3
Depends on makeup alkalinity, cycles, acid feed.
Skin temperature 65°C max Higher temp. require specific treatment to control potential precipitation of Mg(OH)2 and/or CaSO4
Flow velocity 1 - 2.5 m/s Depending on erosion resistance of the metallurgy
Reynolds number 30000-60000 Low values promote the deposition of suspended solids
Suspended solids < 8 mg/l or < 15 mg/l For film fill and splash fill, respectively
Typical Operating Conditions:Sea Water Cooling Towers
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9Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
System Considerations: Cycles on Water Usage
Water Usage vs. Cycles of Concentrationfor 26,850 m3/hr & 7 C Temp Rise
0
500
1000
1500
2000
2500
3000
1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
Cycles
m3
/ hou
r
Evaporation Make Up Total Blowdown
-31% Make Up-48% Blowdown
- Pumping Cost Reduction- Chemical Use Reduction- Lower Impact on Marine Environment
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10Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Sea Water Scale
• Seawater is naturally very stable; but severe scaling problems may occur as temperature and cycles increase.
• Scale control requirements vary with the operating conditions:– Cycles of Concentration– Temperature– pH– Alkalinity– Water velocity– Suspended solids
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11Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Predicting Scale Formation in Sea Water
• Traditional scaling indices do not apply to sea water.
• Nalco Research developed a new application model for seawater scale inhibition.– Accurate calculations of scale saturation indices.– Calculation of inhibitor dose requirements based on research
testing and field experience.
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12Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Scale InhibitorAutomation & Control
• Sea water recirculating cooling system operate with high blow down rate and low cycles
• Scale inhibitor is applied at a very low dosage – 0.5 – 5 ppm as product / Make up
• An automated control system is needed to assure the right amount of scale inhibitor is fed into the system while maintaining the optimum cycles of concentration– 3D Trasar® system enables treatment on demand– 3D Trasar® system provides continuous on line analyses of
water parameters– 3D Trasar® automatically follow changes in load
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13Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Scale control Management
Continuous measurement of the inhibitor level, and control of the injection.
Conventional Water treatment
Inhibitor consumption
3D TRASAR
Time
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14Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
3D TRASAR
3D TRASARFluorometer
pH en ORP probes
Conductivity probe
Corrosion probes
Measured and logged parameters:
• pH• ORP• Conductivity• Corrosion rate Steel and Copper• Temperature• Turbidity• Inert Trasar (Total dosed product)• Fouling fluorometer• 4 x 4-20 external mA signal
All parameters can be transferred on line to any computer, desk top, lap top or mobile phone via land line or satellite
communications for constant and instant monitoring and alert messages
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15Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
Example: 10,000 m3/h recirculation rate and 5 deg C delta T cooling tower
Make up water pumping cost, in $/year
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50
Cycles of concentration
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16Essential Expertise for Water, Energy and AirEssential Expertise for Water, Energy and AirSMSM
3DTrasar on Sea Water Cooling Towers
By providing constant, accurate and online monitoring and control of the inhibitor levels in the Sea Water, 3DTrasar generates important savings in energy and chemicals consumptions while maintaining the integrity of the system.