Combustion of Rechargeable Metal Fuels in Fluidized Bed Boilers (CORAL)
Research Project, 2024 – 2028

The cyclic reduction/oxidation of metal oxide/metal is a promising approach for energy storage and flexible CO2-free provision of
heat and power. The project explores a novel concept of metal oxidation utilising retrofitted coal-fired fluidized bed power plants.
Required modifications of the steam generator, solid feeding, and extraction systems are identified. A hydrogen-based process will
be used for the direct reduction of metal oxides. The reduction/oxidation process in fluidized beds is tested at various scales up to 1
MW thermal power. Various numerical models (steady-state, dynamic, and CFD models) are developed, validated by experiments,
and applied to design modifications. The concept is assessed regarding electrical efficiency, economics, environmental and social


David Pallares Tella (contact)

Chalmers, Space, Earth and Environment, Energy Technology


Fortum Corporation

Fortum, Finland

Lappeenranta-Lahti University of Technology (LUT)

Lappeenranta, Finland

Polytechnic University of Milan

Milano, Italy


Maerne, Italy

Spanish National Research Council (CSIC)

Madrid, Spain

Sumitomo SHI FW Energia Oy

Espoo, Finland

Technische Universität Darmstadt

Darmstadt, Germany


Essen, Germany


European Commission (EC)

Project ID: 101155814
Funding Chalmers participation during 2024–2028

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