HYDROGEN FUELING STATION USING HYDROGEN GENERATION BY ALUMINUM POWDER HYDROTHERMAL OXIDATION

Current commercial technologies of hydrogen generation have drawbacks. Vast amount of harmful byproducts are evolved, e. g. carbon dioxide (for example, steam reforming of natural gas process) or electricity source is demanded (water electrolysis process). The paper presents a hydrogen fueling station based on developed technology of hydrothermal oxidation of commercially available aluminum powder. Continuous mode reactor is filled in with predetermined ratio aluminum powder / water mixture and withdrawn with reaction products: steam-hydrogen mixture and aluminum hydroxide. Aluminum powder reacts with water at temperature 300-320 ºС and pressure 11-13 MPa. High amount of heat released by oxidation (15,3 MJ/kg aluminum) is used to drive turbine and for electricity generation. This energy is used to power the hydrogen compressor, pumps and control systems. Thus this hydrogen fueling station is fully autonomous, independent from outside power systems and could be located far from power supply networks. Hydrogen generated meets grade A demands (99,99% H2) and could be used in fuel cell without cleaning. Aluminum hydroxide (boehmite) is valuable high demand product. Parameters of aluminum powder driven fueling station with capacity of 200 kg of hydrogen per day is shown.

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