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Water-free Combined Cycle
Power Plants for Distributed
Power Generation
Michael Welch
Industry Marketing Manager, Siemens Industrial
Turbomachinery Ltd, UK
• Clean
– Low CO2
– Low NOx etc.
• Efficient
• Affordable
– Best LCOE on 1x1
or 2x1 large GT
configuration
• Centralized Power
COMBINED CYCLE
POWER GENERATION
0
10
20
30
40
50
60
70 Open Cycle
Combined Cycle
• Located close to consumers
• Off-grid or grid support
applications
– Industry, Mines, Hospitals
• Security of energy supply
• Reduced investment in
Transmission infrastructure
• Potential to supply heat
DISTRIBUTED POWER
GENERATION
• Multiple smaller units for:
– Flexibility
– Reliability
– Availability
– High Efficiency over a wide
operating range
– Emissions compliance over
wide operating range
DISTRIBUTED POWER
GENERATION
• >15% of world water withdrawals used in power generation
WATER SCARCITY
• Replace water with high
density organic fluid
– Saves c.20000 TPY water
for a 30MW plant
• Well-matched for lower
exhaust temperature GTs
• Various ORC
configurations available
• Lower maintenance than
steam
COMBINED CYCLE USING
ORGANIC RANKINE CYCLE
• The most common
approach
INDIRECTLY HEATED ORC
• Offers improved
efficiency and
lower CAPEX
DIRECTLY HEATED ORC
• Offers highest
efficiency
CASCADE CYCLE ORC
ORC VS STEAM COMPARISON
0
10
20
30
40
50
60
70
3 x 14MW GT 1 x 40MW GT 1 x 55MW GT
Power Output (MW)
Steam Indirect ORC Direct ORC Cascade ORC
15°C, sea level
ORC VS STEAM COMPARISON
42
44
46
48
50
52
54
3 x 14MW GT 1 x 40MW GT 1 x 55MW GT
Net Efficiency (%)
Steam Indirect ORC Direct ORC Cascade ORC
15°C, sea level
ORC VS STEAM COMPARISON
0
10
20
30
40
50
60
70
80
90
100
3 x 14MW GT
Installed Cost Comparison (% based on US$/kW calculation)
Steam Indirect ORC Direct ORC Cascade ORC
15°C, sea level
ORC VS STEAM COMPARISON
0
2
4
6
8
10
12
14
16
US$3/mmbtu US$7/mmbtu US$12/mmbtu
3 x 14MW GT: LCOE Comparison (US c/kWh)
Steam Direct ORC Cascade ORC
US Location, modelled by US EPC
GT ORC VS RICE COMPARISON
0
2
4
6
8
10
12
14
16
18
US$3/mmbtu US$7/mmbtu US$12/mmbtu
3 x 14MW GT: Indicative LCOE Comparison (US c/kWh)
RICE 1 RICE 2 Direct ORC Cascade ORC
US Location, modelled by US EPC
GT ORC VS RICE COMPARISON
Based on specific location, MEA region, high temperature
CHP IS STILL POSSIBLE
POTENTIAL CSP
HYBRID SOLUTION
• Competitive water-free
solution
• Low environmental impact
• Flexible, reliable power for
Decentralized Power
Generation
• Adaptable for specific needs
• Potential to integrate with
renewables
CONCLUSIONS
CONTACT DETAILS
Michael Welch
Industry Marketing Manager
Siemens Industrial Turbomachinery Ltd.
Joseph Ruston Building
Pelham Street
Lincoln LN5 7FD
United Kingdom
Phone: +44 1522 58 40 00
E-mail: [email protected]
