22-01-2013, 02:30 PM
GEOTHERMAL POWER GENERATING TECHNOLOGY
GEOTHERMAL POWER.ppt (Size: 1.89 MB / Downloads: 58)
Introduction
What does geothermal mean?
Why geothermal energy is renewable?
Geothermal heat & earth’s surface
Earth interior is estimated
equivalent to 42 million
megawatt of power .
method of generation
Electricity can be generated even if no source of hot water
Two Wells are drilled.
Rocks between the wells are fractured.
Cool water is pumped down from first well.
Hot water is pumped up from second well.
Dry Steam Type
“Dry” steam extracted from natural reservoir
180-225 ºC
4-8 MPa
200+ km/hr (100+ mph)
Steam is used to drive a
turbo generator
Steam is condensed and
pumped back into the ground
Can achieve 1 kw per 6.5
kg of steam
Flash Type
Steam with water extracted from ground
Pressure of mixture
drops at surface and
more water “flashes” to steam
Steam separated from water
Steam drives a turbine
Turbine drives an electric generator
Generate between 5 to 100 MW
Use 6 to 9 tones of steam per hour
Future of Geothermal Energy
Geothermal power generation growth is continuing, but at a lower speed than in the previous decade, while direct heat uses show a strong increase compared to the past.
The total world use of geothermal power is giving a contribution both to energy saving (around 26 million tons of oil per year) and to CO2 emission reduction (80 million tons/year if compared with equivalent oil-fuelled production)
Conclusion
Cleanliness
Simple and effective concept for electricity production