Improvement of Efficiency of Geothermal Power Plants by Using Hydrogen Combustion Technologies

Abstract

Thermodynamic analysis of the integrated single-and double-flash power plant is performed in order to estimate possible gain from a hydrogen superheating of a secondary steam with the use of 50 MW Mutnovsky GeoPP-1 as an example. Hydrogen superheating of the steam flow in the second flash cycle with the high temperature steam from hydrogen-oxygen steam generator can increase steam temperature at turbine by 20-30 $\mathbf{K}$ and increase steam quality at turbine outlet by 2-4%. Additional available power can be increased by 5-10% (0.5-0.9 MW) and efficiency of the plant can be increased from 10.0% to 12.1%. The best effect for improvement of the steam cycle of Mutnovsky GeoPP-1 is obtained for temperatures below 100°C and combined double-flash binary plant with hydrogen steam superheating is proposed.