Post on 19-Jan-2016
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NGQURA POWER PROJECTNGQURA POWER PROJECT
COOLING WATER SYSTEMSCOOLING WATER SYSTEMS
Intake and Outfall ConsiderationsIntake and Outfall Considerations
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INTAKE & DISCHARGE CONCEPTSINTAKE & DISCHARGE CONCEPTS
Typical intake pumphouse Typical intake pumphouse footprintfootprint
Typical surface outfallTypical surface outfall
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TYPICAL INTAKE PUMPHOUSE CONCEPTTYPICAL INTAKE PUMPHOUSE CONCEPT
4.0 m20 m
INTAKE PUMPHOUSE - PLAN VIEW
10 m
4 DUTY PUMPS (PLUS 1 STANDBY)7 m3 /s EACH
Typical Cross-sectionTypical Cross-section
Typical Plan ViewTypical Plan View
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TYPICAL MULTI-PORT DIFFUSER DISCHARGE CONCEPTTYPICAL MULTI-PORT DIFFUSER DISCHARGE CONCEPT
Multi-port Diffuser with 15 x 0.6m diam Discharge Ports
3 x 2.0m diam Outfall Pipes(Plus 1 Standby)
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CCGT CONCEPT, COOLING SYSTEM ALTERNATIVES & WATER QUALITY GUIDELINES
STEAM CYCLE COOLING TECHNOLOGY
DIRECT SEA WATER COOLING SYSTEM
EVAPORATIVE CLOSED COOLING SYSTEM
100,000 m3
10oC – 12oC
Sodium Hypochloride (NaOCl)
0.1 mg/l (max) -
4,000m3 (make up water) 2,600m3 (purge discharge)10oC Above make up water.5oC Above ambient air temp.Sodium Hypochloride (NaOCl)0.1 mg/l (max)
1.5 Times original seawater (i.e. 1.5 x 35,000 mg/l = 52,500 mg/l).
FLOW RATE:
TEMP RISE:
ANTI-FOULING AGENT:
CHLORINE RESIDUAL:
BRINE CONC. FACTOR:
vs
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Water Quality GuidelinesWater Quality Guidelines
SA WATER QUALITY GUIDELINESSA WATER QUALITY GUIDELINES WORLD BANK GUIDELINES FOR NEW WORLD BANK GUIDELINES FOR NEW THERMAL POWER PLANTSTHERMAL POWER PLANTS
INTERNATIONAL TARGET VALUES INTERNATIONAL TARGET VALUES FOR NATURAL MARINE FOR NATURAL MARINE
ENVIRONMENTENVIRONMENT
ZONE OF IMPACTZONE OF IMPACT KEPT TO A MINIMUM; DETERMINED KEPT TO A MINIMUM; DETERMINED THROUGH EIATHROUGH EIA
100m FROM POINT OF DISCHARGE 100m FROM POINT OF DISCHARGE (ASSUMING NO SENSITIVE ECO-(ASSUMING NO SENSITIVE ECO-
SYSTEMS PRESENT)SYSTEMS PRESENT)
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TEMPERATURE INCREASE AT EDGE TEMPERATURE INCREASE AT EDGE OF ZONEOF ZONE
+/- 1 DEGREE C+/- 1 DEGREE C LESS THAN OR EQUAL TO 3 LESS THAN OR EQUAL TO 3 DEGREES CDEGREES C
LESS THAN 2 DEGREES CLESS THAN 2 DEGREES C
(AUSTRALIA)(AUSTRALIA)
RESIDUAL CHLORINE LEVEL AT RESIDUAL CHLORINE LEVEL AT EDGE OF ZONEEDGE OF ZONE
0.2mg/l AT DISCHARGE I.e. PRIOR TO 0.2mg/l AT DISCHARGE I.e. PRIOR TO DILUTIONDILUTION
7.5 7.5 g/l (4d ave); 13 g/l (4d ave); 13 g/l (1h ave); NOT g/l (1h ave); NOT TO BE EXCEEDED MORE THAN ONCE TO BE EXCEEDED MORE THAN ONCE
EVERY 3 YREVERY 3 YR
SALINITYSALINITY CHANGE < 5% FROM BACKGROUNDCHANGE < 5% FROM BACKGROUND
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INTAKE & DISCHARGE CONSIDERATIONSINTAKE & DISCHARGE CONSIDERATIONS
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Prestedge Retief Prestedge Retief Dresner WijnbergDresner Wijnberg
A M J
2Q06
J A S
3Q06
O N D
4Q06
J F M
1Q07
AA M J
2Q07
J A S
3Q07
O N D
4Q07
J F M
1Q08
M J
2Q08
J A S
3Q08
O N D
4Q08
J F M
1Q09
Sea Water Cooling* & EIA LinkagesSea Water Cooling* & EIA Linkages
ToR
Data Collection
Concept & Prelim Design
Detail Design
RfP
Select
Mobilise & Construct – 24 months
2009/10 O N D J F M
Scoping
SpecialistToR
EIR EMP
ROD
Appeal
Bid Documentation
EIA designand
schedule
risk
Bra
insto
rm s
olu
tion
s
Pre
ferr
ed
Op
tion