New Seawater Antiscalant To Save Energy and Water Consumptions
New Seawater Antiscalant To Save Energy and Water Consumptions
New Seawater Antiscalant To Save Energy and Water Consumptions
PERFORMANCE
NEW SEA WATER ANTI-SCALANT
Dr. Sai Ram Sudhakaran
Sr. Staff Scientist
NALCO – An Ecolab Company
SEAWATER COOLING PERFORMANCE IS VITAL FOR PRODUCTION
▪ Central to many production facilities in the Middle East is a closed loop system that ejects its heat to
seawater cooling towers typically via plate & frame heat exchangers.
▪ The efficiency of heat transfer through these exchangers dictate production yield, especially during
the summer months.
▪ In seawater systems, inefficiencies to cooling are from:
▪ Scale formation
▪ Biofilm
▪ Macrofoulants
▪ Nalco have adopted an holistic management strategy/process to address these problems in a robust
manner so as to provide consistent performance of the whole cooling system.
HOLISTIC TREATMENT PROGRAM DEVELOPMENT
Over Dose
Under Dose
No TAG control
Product dosage
System stress
TAG control
Product dosage
System stress
KAUST STUDIES Product launch
Commercial
application
Pilot Cooling
tower studies
Benchtop studies
SCALE INHIBITION MECHANISM
3DT435 scale inhibition by crystal modification: SEM images
LabView
Open environs (dust, pollutants, molds, humidity etc)
3DT system
Trial #1
Cycles of Concentration (COC) 1.25 (+/- 0.05)
Total Residual Chlorine (TRC) 0.2 ppm
Results
Visual Observation of HX’s No Scaling
Delta T (seawater) 8oC
Delta T (process) 10oC
Bio-fouling Negligible (<104)
TRIAL # 2: HIGHER CYCLES AND TRASAR/TAG CONTROL
Trial # 2
Cycles of Concentration (COC) 1.5-1.8
COC last 10 days 1.8 stepwise to 2.0
Total Residual Chlorine (TRC) 0.2 ppm
Results
Visual Observation of HX’s No Scaling
Delta T (seawater) 8oC
Delta T (process) 10oC
Bio-fouling Negligible (<104)
COMMERCIAL APPLICATION: SAUDI SEAWATER TOWER
SMALL TOWER, 18,500 M3/H RECIRCULATION; USING NON-P TREATMENT
Trial Period was greater than 1 year and run at high COC
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