Flexicycle Power Plants

FLEXICYCLE POWER PLANTS

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The challenge of serving the energy market with competitive baseload power, while also supporting the dynamic power market with quick start peaking power, has now been solved. With Wärtsilä Flexicycle plants you can choose both high efficiency and agility, enabling competitive operation on both energy and capacity markets.

Flexicycle plants are based on the largest and most powerful gas engine in Wärtsilä’s portfolio – the Wärtsilä 18V50SG. Flexicycle plants range from 100 MW up to 500 MW, and are thus perfect for both municipal power generation and the larger utility market.

Traditionally, the baseload generation capacity has consisted of large, centralised coal and/or nuclear power plants alongside combined cycle gas turbine (CCGT) plants, with long ramp-up and ramp-down times. The intermediate load is often handled by combined cycle gas turbines, while the reserve and peaking capacity is often based on smaller, less efficient generating units, which are expensive to operate. The introduction of the Flexicycle power plant

solution makes the concept of using different dedicated power plant technologies for different load ranges and operation profiles obsolete.

The Flexicycle power plants are based on gas fired combustion engines and a steam turbine combined cycle. Each engine is equipped with a waste heat recovery steam generator. The power plant has a common steam turbine with condenser. The power

FLEXICYCLE™ POWER PLANTS COMBINING UNIQUE OPERATIONAL FLEXIBILITY WITH OPTIMUM COMBINED CYCLE EFFICIENCY

ALIAGA, TURKEYType of customer: ..................................................... IPPEngine type: ................................28 x Wärtsilä 20V34SGTotal output:...................................................... 244 MWType of fuel: ..............................................................GasLoad:..................................... Baseload power generation

PLAINS END I & II, COLORADO, USAType of customer: ..................................................... IPPEngine type: .................................20 x Wärtsilä 18V34SG ............................................... + 14 x Wärtsilä 20V34SGTotal output:............................................113 + 118 MWType of fuel: ..............................................................GasLoad:.......................................Peaking power generation

Cover: Barrick, Nevada, 116 MW Gas Power Plant.

plant cooling is typically arranged so that the combustion engines are cooled with closed loop radiators, and the steam cycle with cooling towers.

MultiMode operations The Flexicycle solution combines the advantages of a flexible simple cycle plant with the superb efficiency of a combined cycle plant in a unique way. The combined cycle mode, with an optimum efficiency in excess of 50%, is ideal for baseload operation. In the Flexicycle concept, the dynamic features of simple cycle combustion engines are maintained as the combined cycle can be shut on and off individually for each generating set.

With quick synchronisation and start-up to full load in less than ten minutes, without restrictions or impact on maintenance schedules, the Flexicycle plants can be dispatched immediately when imbalance between supply and demand begins to occur.

The multi-unit design of combustion engine power plants offers optimized flexibility for dynamic load following with independent units, high efficiency at any plant load (by switching units on and off), as well as optimized plant sizing throughout the lifecycle.

Two-in-oneThe Flexicycle power plant solution’s two-in-one characteristic makes it a very competitive

solution for taking care of a grid system’s intermediate load. Thanks to its high combined cycle efficiency, the Flexicycle power plant can also be the best choice for baseload generation, depending on the power system’s capacity mix. Features like fast synchronisation and ramp times, as well as the flexibility of multiple independent units, make the power plants outstandingly well suited to support grid systems requiring flexibility due to daily load fluctuations, or having a significant installed base of wind or other non-dispatchable power.

UTE LINHARES, LINHARES-ESPIRITO SANTO, BRAZILType of customer: ..................................................... IPPEngine type: .................................20 x Wärtsilä 20V34SG Total output:...................................................... 204 MWType of fuel: ..............................................................GasLoad:.......................................Peaking power generation

PLAINS END I & II, COLORADO, USAType of customer: ..................................................... IPPEngine type: .................................20 x Wärtsilä 18V34SG ............................................... + 14 x Wärtsilä 20V34SGTotal output:............................................113 + 118 MWType of fuel: ..............................................................GasLoad:.......................................Peaking power generation

SANGACHAL, AZERBAIJAN Type of customer: .................................................. UtilityEngine type: .................................18 x Wärtsilä 18V50DFTotal output:...................................................... 308 MWType of fuel: ..............................................................GasLoad:................................................................Baseload

STEC, PEARSALL, USA Type of customer: ..................................Municipal Co-opEngine type: .................................24 x Wärtsilä 20V34SGTotal output:...................................................... 203 MWType of fuel: ..............................................................GasLoad:................................................................Baseload

Two operation modes: dynamic simple cycle and highly efficient combined cycle.

Control room view.

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00 60 120 180 240 300 360 420 480 540 600 seconds

Speed acceleration (25s)

Synchronisation (<5s)

rpm

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Load %

660

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Load

Prelubrication (30s)

Loading (< 9minutes)

Engine in hot standby mode, i.e. preheated (HT water temp. >70 °C)

Normal Wärtsilä Flexicycle starting and loading in simple cycle mode. Only 10 minutes from start command to full plant load.

Flexicycle Combined Cycle System� Exhaust gas boiler� Feed water tank� Steam turbine� Water cooled condenser� Condensate preheater� Heat recovery container including auxiliary boiler� Cooling tower� Engine preheater

WÄRTSILÄ FLEXICYCLE POWER PLANTSTwo operation modes: dynamic simple cycle and highly efficient combined cycle. In combined cycle, more than 52% gross electrical efficiency at full load and 48.6% gross efficiency in simple cycle mode.

• Efficient baseload and intermediate load capacity

• Excellent load following and peaking power capabilities

• Superior part load performance

• Quick start and shut down, fast ramp-up capability without restrictions

or influence on maintenance schedule and costs

• Grid black-start without external power

• Size range 100–500 MW, additional investments can be done

in 20 MW blocks

• Compliance with the strictest international and local emissions

legislation

• Easy siting in grid nodes even within city limits

• Low impact of ambient conditions on plant performance

• Low water consumption, no water consumption in simple cycle mode

• Fast-track equipment or EPC delivery

• Wide range of operations and maintenance agreements available

• 24/7 service from more than 160 Wärtsilä service outlets worldwide

Wärtsilä 50SG gas engineTechnical data 50 Hz/500 rpm Unit 18V50SGPower, electrical kW 18 321Heat rate kJ/kWh 7411Electrical efficiency % 48.6Technical data 60 Hz/514 rpm UnitPower, electrical kW 18 759Heat rate kJ/kWh 7411Electrical efficiency % 48.6Generating set dimensions and dry weightLenght mm 18 800Width mm 5330Height mm 6340Weight tonne 360

Heat rate and electrical efficiency at generator terminals, including engine driven pumps, ISO 3046 conditions and gas LHV > 28 MJ/Nm3. Tolerance 5%. Power factor 0.8. Gas Methane Number > 80. Nm3 defined at NTP (273.15K and 101.3kPa).

STEC, PEARSALL, USA Type of customer: .................................. Municipal Co-opEngine type: .................................24 x Wärtsilä 20V34SGTotal output:...................................................... 203 MWType of fuel: ..............................................................GasLoad:................................................................Baseload

Examples of Flexicycle power plant alternatives

200+MW

300+MW

500 MW

Flexicycle power plant based on 12 x Wärtsilä 18V50SG with an output of 225 MW in simple cycle mode and 246 MW in combined cycle mode.



WÄRTSILÄ® is a registered trademark. Copyright © 2011 Wärtsilä Corporation.

Wärtsilä is a global leader in complete lifecycle power solutions for the

marine and energy markets. By emphasising technological innovation

and total efficiency, Wärtsilä maximises the environmental and economic

performance of the vessels and power plants of its customers. Wärtsilä is

listed on the NASDAQ OMX Helsinki, Finland.

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Flexicycle Power Plants