PURPOSE: To prevent a high voltage from remaining in a water electrolytic cell even when many cells are used by continuously supplying pure water on the anode and cathode sides after the power supply to the cell is stopped and removing the oxygen and hydrogen remaining respectively on the anode and cathode sides.
CONSTITUTION: After the power supply to a water electrolytic cell 10 is stopped, a pure water feed valve 2 and flow control valves 3a are kept open to continuously supply pure water on the anode side of the cells 10 through water feed lines 3 and 3'. Meanwhile, flow control valves 4a are opened to continuously supply pure water on the cathode side of the cells 10 through pure water feed lines 4. In this case, the waste water valves 50 and 51 of the waste water lines connected to gas-liq. separators 20 and 30 are opened. Consequently, gaseous oxygen and hydrogen remaining on the anode and cathode sides of the cell 10 are discharged outside the system from the cell 10 respectively through the separators 20 and 30 and the waste water valves 50 and 51. Accordingly, the surroundings are not endangered, a current does not flow through a solid high molecular electrolyte membrane in the opposite direction to normal, and the membrane is not adversely affected.
SASAKI TAKASHI
HIRAI SEIJI
YASUI SHINICHI
KOBAYASHI HIROKO
HARADA MICHIYUKI
Next Patent: PREVENTION OF FOREIGN MATTER FROM BITING INTO ELECTROPLATED STEEL SHEET