The cooperative project OXYCOAL-AC aims at the development of a zero-CO₂-emission coal combustion process for power generation. The scope of the research comprises a multitude of aspects. This article focuses on membrane-based air separation modules and their design for oxycoal conditions, the specifics of coal combustion in a CO₂/O₂ atmosphere including related burner design as well as the cleaning of hot flue gas from oxycoal combustion.