Method For Calcining Lime Or Dolomite And Annular Shaft Furnace Used
Patent No. EP4133212 (titled "Method For Calcining Lime Or Dolomite And Annular Shaft Furnace Used") was filed by Lhoist Recherche ET Developpement on Apr 2, 2021. The application was issued on May 28, 2025.
Patent Summary
A method for calcining lime or dolomite in an annular shaft kiln utilizes an outer and inner cylinder. Material descends through an annular space, preheated and calcined by counter-current first and second combustion fumes introduced at two distinct levels. Calcined material is cooled by air supplied at the bottom, which is suctioned into the inner cylinder as a lower gas stream and removed. To facilitate $\text{CO}_2$ capture by reducing nitrogen dilution, a portion of the upper gas stream is withdrawn and mixed with pure dioxygen to form a first oxidizing mixture. Fuel is combusted in this mixture to generate the second combustion fumes. The process includes extracting the lower gas stream from the inner cylinder for removal.
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Date
Description
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EP4133212
- Application Number
- EP21716733A
- Filing Date
- Apr 2, 2021
- Status
- Granted And Under Opposition
- Apr 25, 2025
- Publication Date
- May 28, 2025
- External Links
- Slate, Register , Google Patents