Results of the thermodynamic analysis of using hydrogen for steam overheating in geothermal power plants are presented. It is shown that increase of parameters of wet geothermal steam leads to increase in power station efficiency at 3-6 % taking into account expenses of the electric power for hydrogen and oxygen production in electrolyzers. The method of an estimation of increase in efficiency geothermal turbine with growth of parameters of steam and results of calculation of expenses of the electric power is resulted. The optimum overheat range of the geothermal steam for providing maximum geothermal station efficiency is defined at the minimum expenses for installation of the additional equipment. Approximate cost of the additional equipment for maintenance of an overheat is estimated and its pay-back terms are calculated.
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