| 摘要 |
PROBLEM TO BE SOLVED: To provide a water electrolyzer made proof against the adhesion and buildup of impurity ions on a solid polyelectrolyte membrane to keep its electrolytic performances stable and satisfactory and being capable of a long- term continuous operation in spite of no using an inexpensive heat-resistant ion exchange resin and to provide a method for operating the same. SOLUTION: The water electrolyzer is the one provided with a cation exchange resin tank 40 for removing cations; an acid storage tank 50 and an acid feed sluice valve 52 for adding an acid; a pH meter that measures the pH value of the water discharged from an anode-side gas/liquid separator 25; a discharge pipe 44 and a discharge control valve 46 for discharging water from an anode chamber; a flow control valve 48 for feed water for electrolysis; and a controller 45a that when the pH value measured with the pH meter 54 reached a specified value, controls the valve 46 to discharge water from the anode chamber, shuts the sluice valve 52, and controls the valve 48 to control the flow rate of the feed water for electrolysis, wherein acidic water containing a large quantity of anions is fed into the anode chamber, and the feed water for electrolysis is set in a specified pH range in consideration for corrosion prevention.
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