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
impact.