Method for operating the water electrolysis system

摘要

A water electrolysis system includes a high-pressure hydrogen production unit for electrolyzing water to generate oxygen and high-pressure hydrogen (the pressure of the high-pressure hydrogen being higher than that of the oxygen), and a gas-liquid separation unit for removing water contained in the high-pressure hydrogen. The gas-liquid separation unit is placed on a hydrogen pipe for discharging the high-pressure hydrogen from the high-pressure hydrogen production unit. In addition, the water electrolysis system includes a high-pressure hydrogen supply pipe for transferring dewatered high-pressure hydrogen from the gas-liquid separation unit, a cooling unit, which is placed on the high-pressure hydrogen supply pipe and is capable of variably controlling the temperature of the high-pressure hydrogen to adjust the humidity of the high-pressure hydrogen, and a control unit.

主权项

1. A method for operating a water electrolysis system, wherein a water electrolysis system comprising:
a high-pressure hydrogen production unit for electrolyzing water, thereby generating oxygen at an anode side and generating high-pressure hydrogen at a cathode side, the pressure of the high-pressure hydrogen being higher than that of the oxygen; a gas-liquid separation unit for removing water contained in the high-pressure hydrogen, and which is placed on a hydrogen pipe for discharging the high-pressure hydrogen from the high-pressure hydrogen production unit; a hydrogen supply pipe for transferring dewatered high-pressure hydrogen from the gas-liquid separation unit; a Peltier element for variably controlling temperature of the high-pressure hydrogen, thereby adjusting the humidity of the high-pressure hydrogen, the Peltier element being placed on the hydrogen supply pipe; and a control unit, the method comprising: detecting a cathode-side pressure inside the high-pressure hydrogen production unit; and variably controlling the current applied to the Peltier element by the control unit based on the detected pressure.