Flash and double flash geothermal power plant make use of the water that is between 300 to 700 F. Flash and double flash is the name given to this power plant because of its working phenomena
Parts of the Flash and Double flash geothermal power plant
A deep well is drilled into the surface of the well to extract hot water from the geothermal source called geothermal vent
Water from the geothermal source is taken into the tank where some of it is converted into the steam and some into the boiling water.
High pressure separator
Steam tank have boiling water and high pressure steam together at same place. High pressure separator separates the steam from the water and forwards the steam to the turbine and water toward low pressure separator
Low pressure separator
Boiling water from the high pressure separator in move to the low pressure separator after passing through the throttling valve. Low pressure separator separates the low pressure steam from the boiling water
Steam turbines are used to produce the electricity from steam. Steam are introduce at two points, high pressure steam is introduce at first stage and low pressure steam is introduce at few stages back from the first stage
Steam which passes from the turbine is still at very high pressure and that pressure is reduce by condenser and steam is converted into the water.
Working of Flash and Double flash geothermal power plant
Hot water from geothermal source is taken to the steam tank where reduce is pressure result into production of the boiling water and high pressure steam. Now high pressure separator separates the steam and water, steam moves toward the turbine and water moves toward low pressure separator. Before low pressure separator there is a throttle valve which increase the pressure of the water and low pressure separates the low pressure steam and water, steam moves toward the turbine and water towards the reinjection pump. Low pressure steam in injected after the few stages from the first stages of the steam turbine because of its low pressure.