Water electrolysis system

Abstract

A water electrolysis system includes a high-pressure water electrolysis apparatus, a water circulation apparatus and a vapor-liquid separation apparatus. The high-pressure water electrolysis apparatus generates oxygen and hydrogen The hydrogen has a pressure higher than a pressure of the oxygen. The water circulation apparatus circulates water to the high-pressure water electrolysis apparatus. The vapor-liquid separation apparatus separates a gas component discharged from an anode side of the high-pressure water electrolysis apparatus from the water in the water circulation apparatus. The vapor-liquid separation apparatus includes a reservoir, a blower and a movable wall. The movable wall is disposed in the reservoir. The movable wall is vertically movable in accordance with a water level in the reservoir and allows the gas component to pass therethrough.

Description

technical field [0001] The present invention relates to a water electrolysis system comprising: a high-pressure water electrolysis device; a water circulation device for circulating water to the high-pressure water electrolysis device; The gas-liquid separation device for separating water. Background technique [0002] For example, hydrogen is used as a fuel gas in order to generate electricity in a fuel cell. Usually, a water electrolysis device is used to produce this hydrogen. This water electrolysis device uses a solid polymer electrolyte membrane (ion exchange membrane) in order to decompose water to generate hydrogen (and oxygen). Electrolyte catalyst layers are provided on both surfaces of the solid polymer electrolyte membrane to form an electrolyte membrane-electrode structure, and an anode-side power supply and a cathode-side power supply are arranged on both sides of the electrolyte membrane-electrode structure to form a cell. [0003] Therefore, in a state in ...

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Problems solved by technology

[0008] However, in the above-mentioned water electrolysis system, a high concentration of oxygen may remain in the oxygen side water tank 1, and hydrogen permeated to the side of the discharge pipe 7a may remain in some cases.

In particular, in a high-pressure water electrolysis device that generates hydrogen at a higher pressure than oxygen, hydrogen tends to stay in the oxygen-side water tank 1

[0009] However, in the above-mentioned oxygen side water tank 1, there is no way to dilute the high-concentration oxygen or hydrogen, but directly discharge

Therefore, although it is considered to supply air for dilution into the oxygen-side water tank 1, for example, carbon dioxide and the like are dissolved in the pure water in the oxygen-side water tank 1, thereby deteriorating the quality of the pure water.

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