Geothermal power plants use the thermal energy of the earth's interior. High-temperature hydrothermal resources (from 149 ° C to 371 ° C) come to the surface in the form of steam or hot water. People use these deposits through drilling in wells. Of these, a special separator comes steam-water mixture. Then the steam separates and moves the turbine, which generates electricity. And hot water provides heat supply. Some geothermal wells reach two miles in depth.
Types of geothermal power plants
There are three main types of complex facilities that work thank to geothermal energy:
- Dry steam installation. To start the turbine use a pair directly from the underground reservoir.
- Flash steam generators. Take hot water from the depths of the earth, turn it into a steam, which then rotates the turbine generator. When the water cools down, it turns into a condensate that is used again for vaporization.
- Binary cycle of power plants. Geothermal heat is transmitted by a secondary liquid. This liquid (freon or isobutane) is converted into steam and used to control the turbine generator.