MobS Mobile sorption heat storage systems: Hot air made mobile

Making use of heat energy at other locations without pipe systems: This was the goal pursued by the Jäckering Mühlen- und Nährmittelwerke GmbH waste incineration plant and plastic drying plant in Hamm. The operations transported waste heat in mobile sorption heat-storage systems by truck over a distance of seven kilometres, thus demonstrating potential savings for many industrial processes.

Heat from industrial processes is often released unused into the surrounding environment in the exhaust gas stream, if there is no immediate use for it on site. In order to save primary energy and CO2 emissions, a mobile heat storage has been developed and tested within the context of the "MobS-II" research project implemented by the Bayerisches Zentrums für Angewandte Energieforschung e. V. (Bavarian Centre for Applied Energy Research) together with Hoffmeier Industrieanlagen GmbH + Co. KG from Hamm-Uentrop. This allows industrial waste heat to be transported from a heat supplier to a heat consumer. The energy can, therefore, continue to be used even without being connected to existing pipeline distribution systems such as local or district heating networks. The waste incineration plant (MVA) in Hamm served as a heat supplier for this project. Thanks to the mobile sorption heat storage, heat energy from MVA Hamm can be used at the Jäckering Mühlen- und Nährmittelwerke GmbH plastic drying plant.

Engine for progress:

  • excess energy can be made use of
  • mobilisation of heat without pipeline networks
  • innovative heat transfer to the medium of air
  • high savings potential for industrial processes

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Photo: EDG

Zeolite as a storage medium

The technical realisation was implemented by the Hoffmeier company. The storage devices are heat-insulated, cylindrical steel tanks, which are 7 metres long and two and a half metres in diameter, containing 14 tonnes of zeolite. Thanks to its porous structure, zeolite is a storage medium that has an extremely large surface area with which it can absorb or release water vapour, thereby storing energy. The storage devices are constructed in such a way that they can be transported by a semi-trailer truck. At the waste incineration plant charging station, up to 12,000 cubic metres of dry air is piped into the heat storage per hour at a temperature of 135 °C. At the discharging station, moist exhaust air from a drying process flows into the storage device at a temperature of about 60 °C. This releases adsorption heat, which heats the outgoing air to around 160 °C. This dry and hot air is then used for drying processes with the aid of a gas burner.

Great potential for industrial processes

By reducing the use of gas for heat production, about 0.6 tonnes of CO2 are saved with each charge-discharge cycle of the mobile sorption heat storage used in the project. Across the entire period of the project, 49 tonnes of CO2 were saved in 87 cycles – despite the use of trucks as transport. As drying processes are used in almost every industrial process, this has enormous potential for other users too.

Partners and sponsors

  • MHB Hamm Betriebsführungsgesellschaft mbH
  • Hoffmeier Industrieanlagen GmbH + Co. KG
  • Jäckering Mühlen- und Nährmittelwerke GmbH
  • Bayerisches Zentrum für Angewandte Energieforschung e. V. (ZAE Bayern)
  • Bundesministerium für Wirtschaft und Energie (BMWi)