Ansaldo Energia - Geothermal Steam Turbines
From New Units - Steam Turbines
Ansaldo Energia approached geothermal power plants nearly one hundred years ago, when the first turbine-generator units driven by geothermal steam went in operation in Larderello (Italy).
Details
A century in the geothermal market has enabled our Company to achieve a high level of reliability and efficiency, as well as a remarkable flexibility in terms of adaptation to different steam conditions and plant arrangements.
The harsh environment, with steam contaminations by corrosive chemicals such as H2S and chlorides and by dissolved salts, which can originate deposits in the steam path, together with a high level of moisture, command specific design features, sometimes different from those of conventional utility units: for example our experience has shown for geothermal applications a distinctive advantage for the impulse technology, in comparison to the reaction technology.
The portfolio includes machines from one cylinder in single flow configuration up to machines with two cylinders in double flow configuration, with different exhaust solutions to suit plant layout requirements: top, lateral, axial discharge to the condenser are available in addition to the conventional vertical downward one.
Products Overview
Ansaldo Energia began working in the geothermal power plant sector nearly a hundred years ago, when the first turbine-generator units driven by geothermal steam entered service in Larderello (Italy).
A century of expertise in the geothermal market has enabled our Company to achieve a high level of reliability and efficiency, as well as a remarkable flexibility in terms of adaptation to different steam conditions and plant arrangements, for both 50 and 60 Hz applications.
The harsh environment these steam turbines must face, with aggressive contaminations by dissolved salts and corrosive acids, together with a high level of moisture, make it necessary to adopt specific design features based on many years’ experience.
The portfolio includes machines based on impulse technology, from one cylinder in single flow configuration up to two cylinders in double flow configuration, with different exhaust solutions to suit plant layout requirements.
Advanced technology features
- The design reflects the following distinctive advanced technology features:
- Impulse technology with new generation of airfoil and sealing.
- Butterfly type admission steam valves.
- Special materials used for rotor and blades to minimize the impact of salt deposits and acid attack on fleet reliability.
- Broad selection of last stage blades available, ranging from 20 to 31inches in diameter, for thebest possible match with the steam characteristics of the specific geothermal field.
- Downward, upward, axial or lateral exhaust configurations to the condenser are all available to ensure maximum flexibility in response to the any Customer’s needs.
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