Patent No. EP4324799 (titled "Method For Calcining Mineral Rock In A Vertical Right Furnace With Regenerative Parallel Flow And Furnace Used") was filed by Lhoist Recherche ET Developpement on Jun 28, 2021. The application was issued on Jan 15, 2025.
A method for calcining mineral rock in a regenerative parallel flow vertical straight furnace that reduces CO2 emissions by recirculating a portion of the furnace exhaust gas, mixing it with concentrated oxygen, and reintroducing it into the combustion zone. The method also incorporates a heat exchange system to recover energy from the heated exhaust gas.

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