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Session: Operational experience II
Session starts: Tuesday 08 October, 15:40
Presentation starts: 16:00
Room: Van Beuningen Zaal

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Matteo Dall'Ara ()
Matteo Berti ()
Andrea Burrato ()
Alberto Scotti Del Greco ()
Paolo Del Turco ()

Abstract:
The current energy market is pushing to promote the development of more efficient ways of exploitation of energy sources available, achieving at the same time an overall plant reduction in CO2 emissions. This, coupled to the fact that some countries are pushing for emission regulations up to the introduction of carbon taxes, is fostering the interest in increased efficiency embedded in the waste heat recovery systems. The traditional Rankine Cycle with water/steam has limitations that make difficult its application in systems where the load of the gas turbine over time is variable or where water is not available, or where the temperature of the waste heat source is low. The ORegen™, Organic Rankine Cycle developed by GE, is a double closed loop system that overcomes the limitations described above. The system is capable of recovering waste heat from gas turbines also operating at load that may vary dramatically over time (like in mechanical drive application) or located in areas where the water is not at hand. The core of the system is a family of high efficiency double stage turbo-expanders, covering the power range up to 17MW. This article describes the ORegen™ recovery cycle and the design and development of turbo expanders, including the experimental test campaign performed on the Inlet Guide Vane mechanism to validate the positioning accuracy. The most relevant aspects of the first unit commissioning and testing are also given. Finally, a business case study and the future development for the ORegen™ cycle that demonstrate perspectives for spreading waste heat recovery to new fields of application are presented.