Geothermal
power plant
It is also a thermal power plant, but the steam required
for power generation is available naturally in some part of the earth below the
earth surface. According to various theories earth has a molten core. The fact
that volcanic action taken place in many places on the surface of earth
supports these theories.
Figure: Geo-thermal power plant
Steam
well
Pipes are embedded at places of fresh volcanic action
called steam wells, where the molten internal mass of earth vents to the
atmospheric with very high temperatures. By sending water through embedded
pipes, steam is raised from the underground steam storage wells to the ground
level.
Separator
The
steam is then passed through the separator where most of the dirt and sand
carried by the steam are removed.
Turbine
The
steam from the separator is passed through steam drum and is used to run the
turbine which in turn drives the generator. The exhaust steam from the turbine
is condensed. The condensate is pumped into the earth to absorb the ground heat
again and to get converted into steam.
Location
of the plant, installation of equipment like control unit etc., within the
source of heat and the cost of drilling deep wells as deep as 15,000 metres are
some of the difficulties commonly encountered.
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