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Topics 1 June 2022

More Knowledge – Less Downtime

Tests on pilot systems and test rigs are an important step in product development. The results determine the subsequent processes and their parameters. Therefore, all the variables and measured values should be documented as fully as possible, and any necessary process tools require reliable availability and uniform quality. This applies especially to the 24 V supply for the connected loads. Having not just a constant power supply, but also the ability to obtain informative feedback about the real-time status of the power supply unit is a clear advantage.

The Benefits of the WAGO Pro 2 Power Supply for You:

A pluggable communication module for real-time monitoring of the power supply and loads
Limiting value violation alerts support predictive maintenance
Configurable electronic circuit breaker

Energy storage is a key challenge on the path to a climate-friendly energy system. How can uninterrupted service be guaranteed even when the wind isn’t blowing and the sun isn’t shining? One possible solution is conversion of electricity into hydrogen through electrolysis. Decentralized hydrogen generation would increase the efficient of such an approach, allowing benefits such as the elimination of long transport routes from wind parks to hydrogen stations. Compressing the hydrogen obtained from these smaller electrolyzers presents another obstacle: Conventional mechanical compressors are maintenance-intensive, require a lot of space and generate noise.

In contrast, electrochemical hydrogen compressors (“EHCs” for short) require no moving parts at all. The basic setup merely requires an anode, a proton conducting membrane (PEM = polymer electrolyte membrane) as the electrolyte and a cathode. When voltage is applied and wet hydrogen is supplied to the anode side, H₂ molecules are split into protons and electrons, and the protons are electrochemically driven through the PEM to the cathode. At this point, they recombine with their electrons into molecular hydrogen. This method can achieve pressures from 700 to 800 bar. Even higher pressures can be generated by connecting several membrane electrode units in series. In the future, this flexibility will make the method useful both for private households and on an industrial scale.

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Extensive Research on a Solid Foundation

Several companies are engaged in intensive research to take further advantage of the possibilities offered by EHC. One global market leader headquartered in the Netherlands operates several EHC test systems. For efficient compression, a myriad of parameters need to be recorded and monitored, such as water vapor partial pressure, current density, operating temperature and values relating to hydrogen ion back diffusion. The sensors, regulators, flow meters and thermometers necessary for this are quite sensitive and require a constant, high-quality 24 V power supply. This used to cause enormous headaches for engineers: Even with a correct design, occasional power failures would not only damage the sensitive instruments, but also set the research process back.