Integrated Solar Combined Cycle (ISCC)
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Integrated Solar Combined Cycle (ISCC)
Siemens’ designs a power block solution which encompasses all components for the entire water/steam cycle in parabolic trough, central tower, and linear fresnel concentrated solar power plants and hybrid plants.
In addition to the steam turbine generator turbo set, the portfolio includes comprehensive range of components. This can include steam generators, condensing systems to preheaters, and cooling systems as well as the electrical equipment, plant control systems, and instrumentation.
Siemens is uniquely positioned to provide not only state-of-the-art power block component technologies but also to integrate them into a more reliable, flexible and efficient power block that gets the most from the sun’s energy. As your power block provider, this includes the guarantees and risk mitigants you expect from Siemens as a utility, a developer, a technology owner or an EPC company.
Siemens is the world market leader in steam turbines for CSP plants. We offer comprehensive steam turbine portfolio for solar thermal applications, covering the full range from 1.5 MW to more than 250 MW. The turbine technology fits different CSP technologies and is suitable for air-cooled and water-cooled plants. The steam turbines are available in non-reheat, reheat and double-reheat solutions, and they offer excellent flexibility for all cycling conditions. Siemens adopts a reference plant design approach in providing CSP Power Block solutions. The pre-engineered design integrates the power block, the solar field, and the heat transfer fluid system into a plant solution that optimizes key interface parameters to produce a value-driven solution to its customers.
Siemens’ reference plant design includes innovations like BENSON® technology steam generator that provides operational benefits given its high thermal flexibility. A single-vessel compact design of the BENSON steam generator can lower erection and operation and maintenance costs. It also allows the CSP plants to have fast start-up capabilities and an optimized part-load behavior to increase the annual production yield and to maximize return on investment.
Siemens uses the most advanced technologies for our concentrated solar power solutions. We offer a variety of products that can be customized to the needs for your solar field. Our spolight product is our BENSON® brand boiler. We also offer a variety of Steam Turbines to meet the megawatt capacity and steam conditions for solar fields. Our generators can also be water cooled or air cooled.
What makes our BENSON® Boiler the market leader for concentrated solar power plants, is our innovative space-saving design. The fully-assembled vertical layout reduces erection time and commissioning costs.
- Single vessel includes economizer, evaporator and superheater
- Capacity of up to 120 MW for each steam generator
- Header-type design that offers excellent thermal flexibility - up to 20 K / min
- No water and energy losses associated with blow-down
- Significant erection and commissioning savings
Generators can have various types of cooling systems: TEWAC (totally enclosed water-to-air cooling), CACA (closed air-to-air cooling) or DAC (direct air cooling, cooling-air intake via filter). Generators accommodate up to 350 MVA. These options are flexible based on customer preference and site conditions.
Siemens has customized power block solutions for different CSP technologies and site specific requirements. These power block solutions include scope ranging from equipment only to full engineering, procurement and construction (EPC) solutions.
An optimized power block solution from Siemens can be integrated seamlessly into an existing combined cycle or coal fired power plant. In an integrated solar combined cycle plant (ISCC) inefficient supplemental firing (duct burning) can be replaced with solar generated steam to improve the overall plant efficiency and supply power during periods of peak demand.
Siemens also provides power block solutions for hybrid plants where a CSP plant is combined with gas firing to levelize the power production. The hybrid plant can have several advantages: the inclusion of gas can provide the capability to dispatch up to 24 hours of electricity during periods of low solar irradiation, and where gas prices are high the inclusion of solar steam can help reduce the amount of gas consumed.