Technologien zur Speicherung von Wasserstoff. Teil 2: Irreversible Konversion und Technologievergleich

Hydrogen storage primarily means storage of a chemical substance. However, it is also often considered as a form of energy storage. Since many technologies for storing hydrogen are based on a chemical conversion anyway, it is reasonable to ask whether the backwards conversion to release hydrogen again is mandatory. If hydrogen is for example converted by a chemical reaction into a hydrocarbon, it can be meaningful to directly combust this hydrocarbon. Such processes open new routes for the utilization of hydrogen energy. The respective technologies are introduced and a comparison to storage options with recovery of elemental hydrogen is presented.     

Technologien zur Speicherung von Wasserstoff. Teil 1: Wasserstoffspeicherung im engeren Sinn

The efficient and dense storage of hydrogen still is a challenge for research and development. Next to compression and liquefaction, there are a number of alternative approaches, which try to enhance storage density by bonding hydrogen to another substance. Physisorbing as well as chemisorbing organic and inorganic carrier systems are possible. Many of these technologies have not yet exceeded the technology readiness level of lab‐scale tests. However, some of the technologies have already reached significantly higher technological levels. The first part of this study discusses storage approaches with recovery of elemental hydrogen.     

Energetische Betrachtung der Wasserstoffeinspeisung ins Erdgasnetz

The proceeding increase in the share of renewable energies requires a fast allocation of chemical energy storage capacities. One option is the feeding‐in of renewable hydrogen into the natural gas distribution system. A thermodynamic evaluation shows that the feeding‐in has a good overall efficiency compared to other chemical storage technologies. Due to the limited intake capacity of the distribution system, the available capacities are not sufficient for a total shift of the energy system to renewable sources. Nevertheless, it can, as one of a group of measures, contribute to a general energy storage system.     

Entwicklung eines skalierbaren Brenners zum Betrieb mit reinem Wasserstoff

Various premixing burners have been investigated theoretically and experimentally for the operation with pure hydrogen. Péclet number calculations have been applied for the design. The investigated pore diameters for various preheating temperatures of the gas mixture and for stoichiometric mixture have been considered as subcritical. A flashback‐free operation of the burner could be demonstrated for a gas speed higher than 12 m s^?1. Stable operation performance of the premixing burner for pure hydrogen could be achieved.