what is sample turbines?
This is a very interesting method of getting natural energy at cheaper rate but that is determined by geological factors.
What is binary cycle turbine?
What is flash method ?
Types of geothermal turbines: Single exhaust condensing turbine Double exhaust condensing turbine Admission condensing turbine Single exhaust back pressure turbine
A typical geothermal power plant has a power output around 30-50 MegaWatt compared to several GigaWatt (GW) from conventional oil- or coal-fired plants. Therefore, between 20-33 geothermal stations are needed to replace a 1 GW conventional power station. However, once installed, geothermal operating costs are low.
Electricity generation using steam from geothermal fields is essentially the same as in fossil-fuel and nuclear power plants, with various modifications to suit the enthalpy of the field.
In high-enthalpy fields, such as Larderello in Italy and the Geysers Steam Field in California, the reservoir contains large volumes of superheated water at pressures up to 30 times atmospheric pressure, similar to that used in a conventional thermal power plant.
When the fluid flashes to vapour the steam escapes at speeds up to 300 m per second (comparable with a jet engine at full throttle) and is suitable for electricity generation using the simplest turbines from which steam is vented to the atmosphere.
The efficiency of a geothermal turbine can be further increased if the steam is condensed behind the turbine as this increases the pressure gradient and so increases the speed of the steam.
The ‘spent’ water will still be very hot, and can be re-injected into the geothermal aquifer system to maintain the volume and pressure of the geothermal fluid.
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