Water electrolysis system and control method therefor
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United States of America Patent
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Aug 23, 2022
Grant Date -
Oct 22, 2020
app pub date -
Apr 15, 2020
filing date -
Apr 19, 2019
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Abstract
A water electrolysis system produces hydrogen gas at a higher pressure than oxygen gas. A Peltier cooler is disposed between a gas-liquid separator and a back pressure valve in a hydrogen gas flow path, and cools and dehumidifies the hydrogen gas. A temperature sensor measures a temperature in the vicinity of the Peltier cooler, and outputs a temperature measurement value. A pressure sensor measures a pressure of the hydrogen gas between a cathode and the back pressure valve in the hydrogen gas flow path, and outputs a pressure measurement value. A control unit controls a cooling temperature by the Peltier cooler, in a manner so that the temperature measurement value becomes a target temperature that exceeds the freezing point of water corresponding to the pressure measurement value. At least a portion of the target temperature becomes lower as the pressure measurement value increases.
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