BMWK-project: OxyGreenCO₂

BMWK-project: OxyGreenCO₂ – Generation of renewable CO₂ from biogenic solid fuels by means of Oxyfuel-combustion

The BMWK project demonstrates Oxyfuel-fluidized bed combustion of biogenic solid fuels using the oxygen produced during electrolysis. In this way, “green” CO₂ can be made available for various usage concepts via partial condensation of the flue gas.

Support Code: 03El5480A

Term: October 2024 – September 2027

To decarbonize the heating and transport sector, Power-to-X applications for coupling with the electricity sector are discussed. In addition to hydrogen, which can be provided from water electrolysis, CO₂ is also required as a carbon carrier for the synthesis of renewable gases and fuels. The fertilization in commercial vegetable cultivation also relies on CO₂. Oxyfuel-combustion of biogenic solid fuels produces a water-CO₂ mixture from which the CO₂ is easily separated by partial condensation. The resulting “green” CO₂ can replace the “fossil” CO₂ used primarily in synthesis. The waste heat and condensation heat from the system can also be used to heat greenhouses. The oxygen required for Oxyfuel-combustion is a by-product of water electrolysis. The system offers good conditions for a fully integrated bioenergy site, where hydrogen and “green” CO₂ are produced in addition to electricity and heat.

 

At the Chair of Energy Process Engineering, a 100 kW fluidized bed combustion system will be converted to Oxyfuel operation and a partial condenser for separating the CO₂ will be integrated into the laboratory system. High combustion temperatures are the main challenge in Oxyfuel combustion. For cooling, a system will be developed to recirculate the aqueous condensate to the fluidised bed. The heat will be investigated experimentally for biogenic solid fuels with different water contents.

The Steinmüller Engineering GmbH will design an industrial-scale Oxyfuel-fluidized bed combustion system, focusing on the modified heat transfer to demonstrate boiler design adaptations for pure oxygen combustion.

An agent-based plant model will be used to investigate the economics and interaction of the greenhouse’s CO₂ and heat requirements with the electricity price-dependent supply of oxygen from electrolysis.

The project will thus demonstrate a way to integrate bioenergy with “green” CO₂ for use in synthetic fuels and other applications.

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