Filtration Solutions for Hydrogen Electrolyzers
The world is currently pursuing all possible means to reduce global warming emissions from carbon-producing fuels. Hydrogen plays a critical role in creating alternative systems that provide the carbon-free energy required for a sustainable future.
Hydrogen generation through electrolyzer systems brings several challenges with it since it requires a high level of cleanliness to maintain efficiency of both the cell stacks and the dryers. the hydrogen and air streams. Parker can support customers in their electrolyzer system development with a range of filtration products that will purify feedwater, lye, hydrogen, and oxygen streams. Filtration is an important part to help protect critical equipment resulting in increased uptime, longer life, and higher performance.
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Products for Hydrogen Electrolyzers
ELECTROLYZER FEEDWATER AND LYE PARTICULATE FILTRATION
It's important that feedwater and make-up water coming into the electrolyzer stack is ultrapure and free from contaminate to maintain the efficiency of the stack for optimal water electrolysis reaction performance. A water filter is recommended on the inlet water feed to remove particulate and also in the make-up water feed, after the ion exchange polisher, to remove resin carry over.
Alkaline electrolyzer technology uses highly corrosive potassium hydroxide 30- 40% (KOH) as the electrolyte. In the alkaline electrolyzer the electrolyte will be separated from the hydrogen and oxygen gas stream and circulated back to the stack again. Due to the corrosive KOH, the electrolyzer component will corrode and produce very fine particles that can clog the electrolyzer and cause scaling in the system. These particles, when not filtered out, will contaminate the stack and other components which results in lower efficiency and shorter life of the stack and the electrolyte. A lye filter is recommended in the deionized water loop to remove particulate.
The Parker XtreamPure® liquid particulate filter offers high filtration performance and a smaller vessel footprint which are important to maintaining a clean electrolyte stream. The vessel is designed with large diameter cartridges that allow for high flow rates, which significantly reduces the number of cartridges to change-out. XtreamPure filters can be used on both the water stream and lye alkaline solution stream.
ELECTROLYZER GAS / WATER SEPARATION (HYDROGEN AND OXYGEN)
When it comes to removing bulk water from gas streams on an electrolyzer (both hydrogen and oxygen) a plant operator will generally want to remove as much water as possible with an efficient and compact solution. Removing water or electrolyte from the hydrogen stream coming off the electrolyzer stack is one such area where effective removal of water / electrolyte can reduce product loss, downstream corrosion, contamination, and damage to equipment such as compressors, molecular sieve dryers, and blowers. The other benefit about high-efficient water removal is that the demineralized water production system can produce less water.
For electrolyzer applications, Parker has developed a unique PEACH Gemini PuraSep® 2 solution which combines bulk water separation, high efficiency gas coalescing (utilizing Parker’s proprietary PEACH® technology) and degassing - prior to the separated water being returned to the stack. By combining multiple filtration and separation technologies into one system, customers can benefit from increased efficiency, reduced complexity, lower cost, and smaller footprint. The Gemini solution can be used to separate bulk water from both hydrogen and oxygen gas streams.
