Types Of Geothermal Power Plants
Geothermal Energy is getting more and more speed on the renewable energy market these days. In this post I will try to summarize some of the most interesting and useful ways to produce clean and green energy using geothermal power.
There are three types of geothermal steam plants depending on the way the energy is generated:
1.The first one is Dry Steam Power Plant produce energy directly from the steam generated underground. In this case we do not need additional boilers and boiler fuels because the steam (and no water) directly fill up the wells, passing through a rock catcher and directly operate the turbines. The using of such type is not popular because the natural dry steam hydrothermal reservoirs are very rare.
2.Flash Steam Power Plant – it is used when there is a liquid hydrothermal resource with high temperature (over 350 F). The operating principle is that when the hot water is released from the pressure it is collected in a flash tank where the liquid is flashed to steam. The latter is separated from the liquid and it is used to run the turbines. The waste water is reinjected into the hydrothermal reservoir.
3.Binary Steam Power Plant – it is employed when the hydrothermal resource is with lower temperature (100 F). The hot water is passed to a heat exchanger where it is compound with secondary liquid with lower boiling point (hydrocarbon like isobutane or izopentane). This mixture vapor and its steam run the turbine. The waste mixture is recycled trough the heat exchanger. The geothermal fluid is condensed and it is returned to the hydrothermal resource. Since the most resources are with lower temperature the binary steam power plants are more common.
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