Electrolysis can react to fluctuations in the supply generated by renewable energy in a matter of milliseconds - much faster than previous methods. The prototype of a storage facility equipped with PEM technology produces between two and six kilograms of hydrogen per hour.
One such facility, which is rated at 0.3 megawatts at peak capacity, went into operation at the Coal Innovation Centre at the RWE power plant in Niederaußem as part of the CO2RRECT (CO2‑Reaction using Regenerative Energies and Catalytic Technologies) project.
It will simulate operational situations resulting from conditions that could be caused by fluctuations in the amount of electricity fed into the grid. Siemens and its partners in the project, including RWE, Bayer, and ten academic institutions, aim to use electrolytically harvested hydrogen to convert carbon dioxide into a raw material that can be used in the industrial production of chemicals.
Energy storage facilities for electricity from renewable sources are important components of the energy transition. Compressed hydrogen gas has a high energy density and could be stored in underground salt caverns, for example. When desired, the hydrogen can be converted to electricity, and it can also be used as a fuel and as a raw material for industry. Until now, electrolysis facilities were not conceived or designed to be able to react flexibly to large energy fluctuations.
At Siemens' Industry Sector a new low-maintenance electrolysis technology has been developed based on research from Corporate Technology. In the electrolyzer a proton exchange membrane (PEM) separates the electrodes on which hydrogen and oxygen form. One reason this electrolyzer can react so quickly is that the membrane is very stable in response to pressure differences in the two gas chambers. Because it is equipped with internal cooling and is designed for high current densities, it can easily handle three times its rated capacity for some time and needs almost no electricity at all when in standby mode.
Smaller versions of this system could soon be installed at filling stations to produce hydrogen for fuel cell vehicles. Modular systems with outputs of up to ten megawatts should be available in a few years. These would be appropriate for industrial and other applications.
In the long term, systems using PEM electrolysis should be able to operate in the triple-digit megawatt range that would be necessary to handle the output of offshore wind farms and/or provide load balancing capacity for primary and secondary control reserves. Siemens will continue to develop the design, materials, and manufacturing processes for PEM electrolysis.
Dr. Norbert Aschenbrenner | Siemens InnovationNews
Laser sensor LAH-G1 - optical distance sensors with measurement value display
15.08.2017 | WayCon Positionsmesstechnik GmbH
Engineers find better way to detect nanoparticles
14.08.2017 | Washington University in St. Louis
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
18.08.2017 | Life Sciences
18.08.2017 | Physics and Astronomy
18.08.2017 | Materials Sciences