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In hydrogen production, water electrolysis technology is widely used to produce hydrogen of high purity. Hydrogen production by water electrolysis is a technology that has proven its efficiency and reliability. Generator operation principle is based on water electrochemical decomposition into its basic elements due to direct current flowing through electrodes immersed into alkaline medium.
An electrolysis unit has a modular type of construction. The hydrogen generator consists of: electrolyser, separation unit, hydrogen purification unit. Depending on unit capacity, a number of electrolysis units varies. The hydrogen amount released on electrodes depends directly on the current amount flowing through the unit.
The hydrogen generation process starts with water treatment, as the entire hydrogen generation system’s lifetime depends on water treatment quality. Inside the chamber, pure water and potassium hydroxide (KOH) are prepared and mixed to produce a functional electrolyte that minimises electrical resistance and allows solution electrolysis to begin. The electrolysis products are hydrogen and oxygen. Gases are then piped separately to corresponding separators, where gas bubbles are extracted from the electrolyte, the gas is collected at a vessel top and flows to flushing columns. In the washing columns, by means of demineralised water, gases are additionally cleaned from residual alkali, cooled in coolers and fed to an adsorption dryer, where moisture is separated to a dew point of -70 °C, after which the hydrogen can be sent to consumers.
1. Demand | Nm³/hour | from 1 to 250 and more |
2. H2 purity | % vol. | up to 99,999 |
3. Output pressure | bar (ex.) | up to 30 |
4. Gas dew point | °С | up to -70 |
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