Transcript Document

Energy Efficiency in CMC
Water Supply/Distribution
System
EM Piyasena
RA Attalage
(Sri Lanka Energy Managers Association)
21st August 2003
1
OUTLINE
Scope
Walk-through and Billing Audit
Detailed Audit
Results
Recommendations
21st August 2003
2
WALK-THROUGH AND
BILLING AUDIT
 General Layout up to Main Distribution Points
Ambathale
Parliament GR
Labugama
Eliehouse GR
Maligakanda GR
Church-hill GR
Dehiwala
Tower
Battaramulla GR
Moratuwa
Tower
Kaduwela
Tower
Kottawa
Tower
Kolonnawa GR
Dehiwala GR
Battaramulla MaharagamaMahalwarawa Homagama
Tower
Tower
Tower
Tower
Homagama Rukmalgama
South Tower
Tower
Kalatuwawa
Biyagama
Tower
Mattegoda
Tower
21st August 2003
Moragasmulla Kolonnawa
Tower
Tower
Pagoda
Tower
Kohuwala
Tower
3
WALK-THROUGH AND
BILLING AUDIT………..Overall Layout
KELANI RIVER
4
3
2
1
1
2
3
PRETREATOR
(13.5 MGD)
CENTRIFLOC
(13.5 MGD)
CENTRIFLOC
(13.5 MGD)
5
B
C
DISTRIBUTION CHAMBER (New Plant)
DISTRIBUTION CHAMBER (Old Plant)
PRETREATOR
(13.5 MGD)
A
PULSATOR
(13.5 MGD)
SUPER
PULSATOR
(10.56 MGD)
SETTLE WATER COLLECTING CHANNEL
SUPER
PULSATOR
(10.56 MGD)
SUPER
PULSATOR
(10.56 MGD)
SUPER
PULSATOR
(10.56 MGD)
SETTLE WATER COLLECTING CHANNEL
11
9
7
5
3
1
13
15
17
1
2
3
12
10
8
6
4
2
14
16
18
8
7
6
OLD SUMP
(S.P.H)
KUBOTA SUMP
4220 m3
9100 m3
4
5
NEW
PLANT
SUMP
2x3300 m3
4220 m3
1
1
2
3
2
3
4
4
1
1
ELIEHOUSE
RESERVOIR
1
2
2
3
MALIGAKANDA
RESERVOIR
3
1
CHURCHILL
RESERVOIR
2
4
2
1
1
2
KOLONNAWA
RESERVOIR
2
3
3
JUBILEE
RESERVOIR
O20
N30
O20
D20
N35
DEHIWALA
RESERVOIR
3
17700 m
MORATUWA
RESERVOIR
4600 m3
PANADURA
RESERVOIR
2600 m3
21st August 2003
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WALK-THROUGH AND
BILLING AUDIT…contd
LABUGAMA
15 MGD
KALATUWAWA 8 MGD
CMC Distribution System
Dehiwala
Maligakanda
Jubilee
Eliehouse
AMBATELE
107 MGD
Total = 62.5 MGD
Greater Colombo others
21st August 2003
Total = 67.5 MGD
5
WALK-THROUGH AND
BILLING AUDIT…Contd
 Share of Distribution of Each Reservoir
Percentage Distribution to Each Reservoir
Dehiwala
22%
Maligakanda
16%
Churchill
15%
Kolonnawa
7%
Jubilee
24%
Eliehouse-1
9%
Eliehouse-2
7%
Total Average Production is 109 MGD (20588 m3/hr)
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WALK-THROUGH AND
BILLING AUDIT…Contd
 Composition of Monthly Production Cost –
Ambathale Treatment Plant
1%
2% 6%
7%
Personal
Electricity
Chemical
Repair
84%
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Admin&Security
7
WALK-THROUGH AND
BILLING AUDIT…contd
Electricity Consumption Variation
Monthly Production Vs Elec. Consumption
Production (Million m 3)
16.0
15.5
15.0
14.5
14.0
13.5
13.0
4.0
4.5
5.0
5.5
6.0
Elec. Consum ption (GWh)
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WALK-THROUGH AND
BILLING AUDIT…Contd…
Monthly Electricity Consumption
7.0
Consumption
6.0
6.0
5.2
5.0
4.9
5.2
4.8
4.8
4.3
4.0
5.7
5.5
4.6
4.7
4.8
0.31
0.32
0.31
3.0
2.0
1.0
0.41
0.33
0.38
0.31
0.35
0.34
0.32
0.42
0.39
0.0
Jul-01 Aug- Sep- Oct- Nov- Dec- Jan- Feb- Mar- Apr- May- Jun01
01
01
01
01
02
02
02
02
02
02
Month
(MWh)
(kWh/m^3)
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WALK-THROUGH AND
BILLING AUDIT…Contd…
Cost of Electricity
Cost (Rs. Million ), (Rs. /m^3)
60.00
50.00
40.00
30.00
48.98
39.60
32.24
34.64
28.77
32.19
34.09
38.99
36.53
31.60
30.76 31.20
20.00
10.00
2.69 2.20 2.51 2.06 2.26 2.28 2.09 2.73 2.05 2.17 2.56 3.37
0.00
Jul-01 Aug-01 Sep-01 Oct-01 Nov-01 Dec-01 Jan-02 Feb-02 Mar-02 Apr-02 May-02 Jun-02
Month
Electricity Cost
Cost per m^3
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DETAILED AUDIT
Preliminary Investigation
 Three major pump sets – Maligakanda ,
Church Hill and New intake
 Electricity Input, pump head, flow rate and
pump speed for parallel and single operation,
 Pump performance evaluation
 Power factor measurements
 Optimization of clarifiers
 On-line calibration of flow meters
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DETAILED AUDIT…contd
Expected and Measured Efficiencies
Pumps which are Efficiency Expected Efficiency Measured
running together Acording to the Curve
New Intake to New Plant
A, C, 5
Effi > 80%
A = 46%
C = 39%
5 = 68%
A, 5
Effi > 85%
A = 55%
5 = 63%
A, C
Effi > 85%
A = 57%
C = 43%
New Intake to Old Plant
1,3
-1 = 70%
3 = 68%
3
Effi > 90%
3 = 69%
Maligakanda pumps Ambathale Treatement Plant
M-1, M-2
Effi > 80%
M-1 = 69%
M-2 = 68%
M-1
Effi > 70%
M-1 = 57%
M-2
Effi > 70%
M-2 = 59%
Churchill pumps Ambathale Treatement Plant
C-1, C-2, C-3
Effi > 75%
C-1 = 69%
C-2 = 67%
C-3 = 69%
C-1
Effi > 80%
C-1 = 73%
C-2
Effi > 80%
C-2 = 75%
C-3
Effi > 80%
C-3 = 69%
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DETAILED AUDIT…contd
Power Factor Measurement
ex:New Intake to Ambathale Treatment Plant
Pump ID
Voltage (V)
Current (A)
Power (kW)
Power factor
Pump A
385.9
635.4
351.6
0.82
Pump C
385.6
672.3
371.1
0.82
Pump 1
402.0
278.9
156.0
0.80
Pump 2
406.5
334.5
187.0
0.79
Pump 3
404.2
339.8
189.6
0.79
Pump 5
401.9
274.7
158.8
0.83
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RESULTS
PRELIMINARY RESULTS
Low power factors at loads
Overall operating efficiencies are lower than
the expected.
Large variation in energy intensities of
pumping.
Water loss due to back wash, sludge drainage &
lab testing is around 7 MGD.
NRW is around 50% in Colombo city
distribution system
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RESULTS…contd
Optimizing energy intensity of pumping
Range of monthly production varies from 101.17 –
111.27 MGD
Range of monthly energy consumption 4.3 – 6.0
GWh
Monthly specific energy consumptions vary from
0.31-0.42 GWh/m3
Same production has distinctly different energy
consumption values
Enhance clarification during high turbidity period
Annual savings of 2 GWh, Rs. 16.7 million
Cost involved Rs.16 million
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RESULTS…contd
Power Factor improvement
Low Power Factors (0.79 – 0.83) were found in
the new intake
Potential monthly max. demand reduction by
improving power factor to 0.95 is 1.52 MVA
Total monthly savings is Rs.0.6 million
Simple payback is 2.4 months
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RESULTS…contd
Improving overall efficiency of pumping units.
Measured operating overall efficiencies of all the
pumps (ranging 40% to 75%)
Improving overall efficiencies
Church-hill
Annual savings of 0.94GWh, Rs.7.5 million
Simple payback for impeller sizing, 08 months
Simple payback for pump replacement, 07years
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RESULTS…contd
Improving overall efficiency of pumping units.
Improving overall efficiencies
Maligakanda
Annual savings of 0.90 GWh, Rs.7.2 million
Simple payback for impeller sizing, 06 months
Simple payback for pump replacement, 5.5years
Extrapolation…..Ambatale Plant
Annual savings of 6.3 GWh
(Comparison monthly mean consumption of
5 GWh)
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RESULTS…contd
On-site calibration flow meters.
Verification by on-line calibration
First results show that flow meter
readings overestimate by 15%
Study to be continued for
confirmation.
If so, estimated saving potentials will
be much higher with low NRW losses.
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RESULTS…contd
Water consumption reduction by end users
End user survey through a questionnaire
Simple statistical analysis carried out
Estimated end-use water saving potential,
17%.
Detailed study is required to extrapolate the
results to the CMC distribution areas.
Identify cost effective, efficient end use
methods/strategies with the view to conserve
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RECOMMENDATIONS
 Low cost no cost options
Enhance clarification. Further investigation of the
fluctuation of energy per unit product is necessary.
 Continue the calibration work to confirm results.
Water consumption reduction by end users.
 Medium cost options
Power factor improvement
Further investigation of NRW
 High cost options
Replacement of low efficient pumps with new pumps
In-situ electricity generation? (study)
Diesel Engine driven pumps? (study)
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Thank You
Co-operation and assistance extended by the
National Water Supply and Drainage Board is
greatly acknowledged.
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