Water electrolysis system

Abstract

A water electrolysis system includes a water electrolysis apparatus for electrolyzing pure water supplied from a pure water supply apparatus for manufacturing high-pressure hydrogen. The water electrolysis apparatus has a pipe serving as a hydrogen outlet to which a gas-liquid separator, a cooler, and a water adsorption apparatus are successively connected in this order along the direction in which hydrogen is discharged from the water electrolysis apparatus. A first back-pressure valve is connected between the cooler and the water adsorption apparatus, and a second back-pressure valve is connected downstream of the water adsorption apparatus.

1 . A water electrolysis system comprising:
 a water electrolysis apparatus for electrolyzing water with an electric current supplied from a DC power supply to generate hydrogen and oxygen;   a water adsorption apparatus disposed downstream of and connected to a hydrogen outlet of the water electrolysis apparatus, for adsorbing water contained in the hydrogen discharged from the hydrogen outlet;   a first pressure regulating valve connected between the hydrogen outlet and the water adsorption apparatus; and   a second pressure regulating valve connected downstream of the water adsorption apparatus.   
     
     
         2 . A water electrolysis system according to  claim 1 , wherein the second pressure regulating valve has a preset pressure which is higher than a preset pressure of the first pressure regulating valve. 
     
     
         3 . A water electrolysis system according to  claim 1 , further comprising a gas-liquid separator and a cooler,
 wherein the gas-liquid separator, the cooler, and the first pressure regulating valve are successively positioned in this order between the hydrogen outlet and the water adsorption apparatus, along a direction in which the hydrogen flows.   
     
     
         4 . A water electrolysis system according to  claim 1 , wherein each of the first pressure regulating valve and the second pressure regulating valve comprises a back-pressure valve. 
     
     
         5 . A water electrolysis system according to  claim 1 , wherein the water electrolysis apparatus discharges the hydrogen under a pressure higher than a normal pressure. 
     
     
         6 . A water electrolysis system according to  claim 1 , further comprising a bleeder passage having an on-off valve, the bleeder passage being connected between the first pressure regulating valve and the water adsorbing apparatus.