published in energy
Diagram of a geothermal power plant
Through the fractures in the layers of rock, water and steam which has been heated in the depths, rise to the surface and are intercepted in the geothermal wells. The steam that is extracted is channelled into steam-pipelines, and forwarded to a turbine, where the kinetic energy of the steam is transformed into rotational mechanical power. The turbine’s axis is connected to the rotor of the alternator, that rotates and transforms the mechanical energy into alternating electric current, which is then transmitted to the transformer. The transformer raises the voltage of the electric energy and transfers it to the distribution network. The steam that exits the turbine is returned to the liquid state in a condenser, while the gases that cannot be condensed are dispersed in the atmosphere. A cooling tower then cools the water produced from the steam condensation process. The condensed water is then dispersed by re-injecting it into the deep rock layers.