1. GEOTHERMAL POWER PLANTS BY Prabhakaran.T AP/MECH
SNS COLLEGE OF ENGINEERING Coimbatore-107 Subject: Power Plant Engineering
GEOTHERMAL POWER PLANTS BY
Prabhakaran.T
AP/MECH

2. What is Geothermal Energy ?
It’s simply the heat energy of the earth, generated by various natural processes, such as: 1. heat from when the planet formed and accreted, which has not yet been lost 2.decay of radioactive elements 3.friction
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3. Geothermal Reservoirs
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4. Geothermal Reservoirs (cont.)
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5. Prabhakaran.T/AP MECH/PPE
Extraction & uses
The heat energy can be brought to earth surface by following ways..
 directly from hot springs/ geysers
 geothermal heat pump
Uses are broadly classified as:-
direct use
indirect use
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6. Prabhakaran.T/AP MECH/PPE
Direct use
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7. Prabhakaran.T/AP MECH/PPE
Indirect use
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8. There are 3 types of power plants:-
 Dry steam power plant Flash steam power plant Binary cycle power plant
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9. Prabhakaran.T/AP MECH/PPE
Dry Steam power plant
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10. Prabhakaran.T/AP MECH/PPE
The oldest type of Geothermal power plant used.
Geothermal reservoir containing pure steam is required.
Pure dry steam drives turbine.
Very rare type of geothermal power plant.
Operating at California, Italy, and Japan.
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11. Flash steam power plant
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12. Prabhakaran.T/AP MECH/PPE
Commonly used geothermal power plant.
Geothermal reservoirs containing both hot water & steam is required.
Pressure changing system is required.
Operating at Hawaii, Nevada, Utah & some other places
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13. Binary cycle power plant
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14. Prabhakaran.T/AP MECH/PPE
Does not use steam directly to spin turbines.
Only the heat of the underground water is used.
Vapourized hydrocarbons are used to spin the turbine.
Hydrocarbons having lower boiling point such as  isopentane, isobutane and propane can be used.
No harmful gas is emitted to the atmosphere because the underground water is never disclosed to outside.
This’s the worldwide accepted power plant
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15. Geothermal Energy in India
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16. Prabhakaran.T/AP MECH/PPE
THANK U
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