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Technology Description

Oxyfuel CO2 capture involves combusting a fuel using nearly pure oxygen instead of air. The flue gas will be composed of CO2 and water vapour, which can be dehydrated to obtain a high-purity CO2 stream. Oxygen is commonly produced by separating oxygen from air in an air separation unit. Advanced concepts with potential for cost reduction include oxyfuel gas turbines and pressurised oxyfuel CO2 capture, which require fewer materials and are potentially cheaper to operate. The technology can be applied to kilns, the main unit producing clinker for cement production.

Relevance for Net Zero

CO2 capture and storage is a key technology to reduce otherwise difficult to avoid process emissions from cement production. Chemical absorption and calcium looping are currently more advanced than oxyfuelling (given experience in the power sector in the case of chemical absorption); however, oxyfuelling has potential to play a role if further development and cost reductions are successful.

Key Countries

Italy, Austria, Denmark, Germany

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