epsco ltd - vgb_+cooling+systems...patented epsco system 1 • tangible results of epsco treatment...
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EPSCO Ltd Energy Sector –
Cooling System Solutions
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EPSCO
Chemically Engineered
Solutions, Practically Applied to Solve Emission and
Efficiency-Related Problems in Cooling Systems
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Common Problems
• Biological Fouling
– biofilms formed by organics, fungi and bacteria in circulating water
• Sedimentary and Scaling Deposits
– solids naturally present in water form surface deposits
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Effects
• Restricted Contact Between Air and Water – reduced heat transfer
– decrease in condenser performance
• Spiralling Build Up from Deposits – significant weight on
pack
– system contaminants
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• Exhaust steam not
sufficiently cooled
• Air & water flow restrictions
Impacts of Effects • Increasing water treatment
costs
• Pack collapse
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Warmer Water
Temperature
Decreased
Water Flow
Restricted
Air Flow
Reduced Condenser
Performance
Fouled Fill-Pack
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Warmer Water
Temperature
Decreased
Water Flow
Restricted
Air Flow
Reduced Condenser
Performance
Fouled Fill-Pack
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Potential Costs & Risks
• Maintenance Issues – costly pack repairs and replacements – excessive downtime
• System Inefficiencies – increase in fuel usage – decreased condenser performance
• Environmental Concerns – surplus water usage – increased carbon emissions – increased plume
• Health Concerns – airborne particulates (bacteria and water
treatment chemicals) • impacts on company employees and local residents
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Traditional Methods of Cleaning Cooling Towers
• High Pressure Water Jetting
– causes irreparable damage to pack and drift eliminators
– damages the surface of timber structures
– removes wet rot protection
– substantial down-time
- largely ineffective
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Traditional Methods of Cleaning Cooling Towers
• Changing the Pack – results in substantial down-time
– incurs the cost of new pack
– disposal cost of old pack
– access and handling Health & Safety concerns
• Biocide Dosing – prolonged, regular treatment required
– does not remove existing deposits or bio-film
– limited ability to stop build-up
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Patented EPSCO System
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Patented EPSCO System
• Initial No-Obligation Survey –pack assessed by our operatives
–samples taken for laboratory analysis
–specifically tailored to individual towers and cells
– tower/cell mapped due to variation of deposit accumulations
–chemical solution determined by survey and laboratory analysis
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Patented EPSCO System
• Downtime Minimised – 12 days for hyperbolic towers, 3-4 hours
for conventional forced draft cells – un-treated towers or cells may remain
active – minimum disruption to production – non-intrusive
• A Fraction of the Cost of Pack Replacement – temperature difference improved by up to
3-4°C – cost of treatment recouped in around 6
months from resulting efficiency gains
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Patented EPSCO System
• Tangible results of EPSCO treatment
• Weight reduction in 15m³ section of pack = 1448lbs/658kg
• Pack condition returned to as good as new
Pre v's Post Treatment
0
500
1000
Pack LayersWei
gh
t (p
ou
nd
s)
Pre Treatment
Post Treatment
Pre
Treatment
214 522 548 576 563
Post
Treatment
197 195 191 197 195
1 2 3 4 5
Note: Results from a 5-layer system
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EPSCO – Cost Savings
• Significant Efficiency Gains
– temperature reduction minimises plume
• less requirement to introduce make-up water into the system as less water is discharged into the atmosphere
–drastic improvements in condenser efficiency
•generating greater power output from the same fuel usage
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Summary
•Level of IPPC Compliance is Increased
•EPSCO Treatment will Save Money
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EPSCO Ltd
Arran Road
Perth
PH1 3DZ
Scotland
UK
+44 1738 446363