Skip to Content
Combined Cycle Power Plants
As in simple cycle applications the gas turbine is the main drive for power generation. To improve overall efficiency, exhaust heat from the gas turbine is used to produce steam for the generation of additional electricity by a steam turbine.
Our Siemens combined cycle (SCC®) reference power plants (RPP) provide flexibility for easy selection of options to meet specific site and customer needs. This, together with a pre-designed balance of plant, results in short project lead times. It provides an optimum balance between capital cost, plant performance, and operational and maintenance considerations. Pre-engineered modular options have been developed to further address individual needs, as well as life-cycle cost enhancements.
The SCC5-8000H 1S reference power plant (RPP) was developed based on the extensive experience accumulated with the large SGT5-4000F single-shaft gas turbine fleet and the Irsching 4 test plant. The main components are arranged on a single shaft and a synchronous self-shifting (SSS) clutch is installed between the generator and the steam turbine. This provides high operating flexibility and reliability. Our new state-of-the-art H-class gas turbine SGT5-8000H is the basis for this reference plant.
The SCC5-8000H 1S RPP is designed around advanced, proven and reliable Siemens equipment, including:
The primary focus of the SCC5-8000H 1S RPP was to develop a plant design based on highest efficiency and maximum operability that offers high customer benefits with low life-cycle costs. Based on the straightforward plant design, daily shutdown, part-load and full-load operation with maximum performance are possible. The modular concept allows easy adaptation to specific customer needs and site requirements. The combination of world-class gas and steam turbine and generator technologies with trendsetting power plant system integration results in a highly efficient plant that provides reliable low-cost electricity. The base design of the SCC5-8000H 1S RPP provides an optimum balance between capital cost, plant performance, and operational and maintenance considerations.
The Irsching 4 combined cycle power plant in Germany is being constructed in two phases:
Siemens has tested the SGT5-8000H under real operating conditions at the gas turbine power plant. After startup, part-load and base-load validation operation of the plant, a comprehensive endurance testing phase was conducted. The duration of the simple cycle test phase was 18 months, which was successfully completed by August 2009.
The plant was extended from simple cycle to a combined cycle station. The gas turbine was modified from a fully instrumented engine and tested in combine cycle operation. The combined cycle extension is now successfully achieved. The validation program is completed (incl. combined cycle performance, steam turbine, FACY start-up, part load operation and grid code dynamic tests).
With the finalization of the reliabilty run, the combined cycle unit achieved more than 4000 equivalent operating hours. Do to the starts-stop operating the gas turbine run almost 100 successfully starts.
Upon completion of the trial operation phase that is now underway, E.ON takes over commercial operation of Irsching.