Geothermal Energy Use in Hydrogen Production

摘要

We propose the use of ge othermal energy for hydrogen production and liquefaction, and investigate six possible models for accomplishing such a task. The models are studied thermodynamically in order to assess their performance for maximizing hydrogen production rate while minimizing the used geothermal energy. The effect of ge othermal wate r temperature on various thermodynamic performance of the models is investigated. The models include using geothe rmal work output as the work input for an electrolysis process (Model 1); using part of ge othermal heat to produce work for electrolysis process and part of geothe rmal he at in an electrolysis process to preheat the electrolysis water (Model 2); using geothermal heat in an absorption refrigeration proc ess to prec ool the gas before the gas is liquefied in a liquefaction cycle (Model 3); using part of the geothermal he at for absorption refrigeration to precool the hydrogen gas and part of the geothermal he at to produce work with a binary geothe rmal cycle and use it in a liquefaction c ycle (Model 4); using geothermal work output as the electricity input for a liquefaction cycle (Model 5); and using part of geothermal work for electrolysis and the remaining part for liquefaction (Model 6).