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Duplomatic applications in a geothermal power plant
Ecology, green energy, reduction of emissions into the atmosphere, are words that have been imposed for some years on all newspaper titles and in television debates. Safeguarding planet Earth has become a priority for humanity.
Duplomatic in its first 70 years of activity has contributed to improving air quality with a series of applications in support of renewable energy. Since the 1990s it has been involved in the creation of hydraulic systems for the control and management of geothermal power plants.
Geothermal energy is contained as steam inside the Earth.
Geothermal power plants are those which, among the various forms of renewable energy, allow the highest installed power. The overall efficiency of geothermal plants is around 10-17%, much lower than that of thermoelectric plants, but they have the great advantage of using an ecological, renewable fluid, with no emissions of carbon dioxide into the atmosphere.
In dry steam power plants, the steam is conveyed into turbines suitable for the thermodynamic characteristics of pressure and temperature of the fluid. Here, the potential energy of the fluid is transformed into mechanical energy which is immediately transformed into electrical energy by a generator connected to the turbine itself.
The steam must be conveyed, controlled and dosed in order to obtain maximum performance. The valves that manage the steam flows are generally operated by hydraulic actuators.
The peculiarity of the plants intended for use in a geothermal environment consists in the choice of materials that must withstand the particularly severe environmental conditions due to the presence of hydrogen sulphide.
This involves the study and construction of ad hoc components, with abundant use of stainless steel. Even the electrical components normally used in hydraulic systems are subject to rapid oxidation; it is therefore necessary to provide gold-plated contacts or sealed in inert gas (argon), to avoid components with copper and its alloys (special coils for solenoids), to favor non-metallic casings.
Duplomatic has created the power and hydraulic control part intended to control the actuators of the 20 MW and 60 MW first generation geothermal plants, installed in the Larderello (PI) area.
In the design of the hydraulic systems, all the safety measures were adopted with the necessary redundancies to guarantee production continuity, with reduced downtime (practically only for scheduled maintenance): three motor-pump groups to have the reserve available also for the stand-by, double turbine trip block systems to ensure the safety of the turbine in any fail-safe condition, accumulator battery to compensate for any black-outs
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