Abrégé

The present invention relates to a decarbonation process of carbonated materials (10), in particular limestone and dolomitic limestone in a multi-shaft vertical kiln (MSVK) comprising a first (100), a second (200), and optionally a third (300) shaft and a first plurality of fluid-supply pipes (125) opening in the first shaft (100) and a second plurality of fluid-supply pipes (225) opening in the second shaft (200), alternately heating carbonated materials (10) by a combustion of at least one fuel (20) with at least one comburent (30, 31, 32) up to a temperature range in which carbon dioxide of the carbonated materials (10) is released, the combustion of the fuel (20) and the decarbonatation generating an exhaust gas (40), said process further comprising a first step of supplying with a pipe-cooling gas (93) at least one of the second plurality of fluid- supply pipes (225), when the second shaft (200) is in a non-combustion state, in particular a regeneration state, said pipe-cooling gas (93) comprising at least 1% CO2 (dry volume) and/or less than 50% N2 (dry volume).

Classes IPC  ?

• C04B 2/12 - Préchauffage, cuisson, calcination ou refroidissement dans des fours à cuve ou dans des fours verticaux
• F27B 1/22 - Aménagement des échangeurs de chaleur
• F27B 1/24 - Refroidissement

Abrégé

Decarbonation system for carbonate materials, in particular limestone and/or dolomite, comprising: a parallel flow regenerative kiln (10) comprising at least a first and a second shaft, and optionally a third shaft with preheating, combustion and cooling zones and a cross-over channel between each shaft, said kiln being arranged to heat alternately, by a combustion reaction, the carbonated materials in the first or second shaft, up to a temperature range in which carbon dioxide of the carbonated materials is released during at least one combustion cycle; a NOx selective catalyst reduction device (30), arranged downstream from said kiln for removing nitrogen oxides in exhaust gas generated by said kiln (10) in cyclic manner.

Classes IPC  ?

• B01D 53/34 - Épuration chimique ou biologique des gaz résiduaires
• B01D 53/86 - Procédés catalytiques

Abrégé

22 recovery in a multi- shaft vertical kiln (MSVK) comprising a first and a second shaft with preheating, heating and cooling zones and a cross-over channel between each shaft, alternately heating carbonated materials by a combustion of at least one fuel with at least one comburent, up to a temperature range in which carbon dioxide of the carbonated materials is released, the combustion of the fuel and the decarbonatation generating an exhaust gas, wherein decarbonated materials are cooled in the cooling zones with one or more cooling streams, said process further comprising extracting the exhaust gas from the multi-shaft vertical kiln and feeding a buffer with said extracted exhaust gas.

Classes IPC  ?

• C04B 2/12 - Préchauffage, cuisson, calcination ou refroidissement dans des fours à cuve ou dans des fours verticaux
• F27B 1/02 - Fours à cuve ou fours verticaux similaires ou à prédominance verticale à plusieurs cuves ou chambres, p. ex. à plusieurs étages
• F27B 1/00 - Fours à cuve ou fours verticaux similaires ou à prédominance verticale

Abrégé

22 recovery in a multi-shaft vertical kiln (MSVK) comprising a first, a second, and optionally a third shaft with preheating, heating and cooling zones and a cross-over channel between each shaft, alternately heating carbonated materials by a combustion of at least one fuel with at least one comburent, up to a temperature range in which carbon dioxide of the carbonated materials is released, the combustion of the fuel and the decarbonatation generating an exhaust gas, wherein decarbonated materials are cooled in the cooling zones with one or more cooling streams, wherein a mixing between the exhaust gas and the one or more cooling streams is minimized, by providing the cross-over channel arranged between the first and the second shaft with a closure means.

Classes IPC  ?

• C04B 2/12 - Préchauffage, cuisson, calcination ou refroidissement dans des fours à cuve ou dans des fours verticaux
• F27B 1/02 - Fours à cuve ou fours verticaux similaires ou à prédominance verticale à plusieurs cuves ou chambres, p. ex. à plusieurs étages
• F27B 1/00 - Fours à cuve ou fours verticaux similaires ou à prédominance verticale

Abrégé

22 recovery in a multishaft vertical kiln (MSVK) comprising a first, a second, and optionally a third shaft with preheating, heating and cooling zones and a cross-over channel between each shaft, alternately heating carbonated materials by a combustion of at least one fuel with at least one comburent up to a temperature range in which carbon dioxide of the carbonated materials is released, the combustion of the fuel and the decarbonatation generating an exhaust gas, the decarbonated materials being cooled in the cooling zones with one or more cooling streams, wherein a mixing between the exhaust gas and the one or more cooling streams is minimized by operating said kiln in a mode in which between two subsequent alternating heating cycles between the first and the second or the third shaft, the decarbonated materials in at least the first, the second and/or the third shaft are cooled with the one or more cooling streams while a supply of the fuel in each shaft is stopped.

Classes IPC  ?

• C04B 2/12 - Préchauffage, cuisson, calcination ou refroidissement dans des fours à cuve ou dans des fours verticaux
• F27B 1/02 - Fours à cuve ou fours verticaux similaires ou à prédominance verticale à plusieurs cuves ou chambres, p. ex. à plusieurs étages
• F27B 1/00 - Fours à cuve ou fours verticaux similaires ou à prédominance verticale

Abrégé

22 recovery in a multi-shaft vertical kiln (MSVK) comprising a first and a second shaft with preheating, heating and cooling zones and a cross-over channel between each shaft, alternately heating carbonated materials by a combustion of at least one fuel with at least one comburent, up to a temperature range in which carbon dioxide of the carbonated materials is released, the combustion of the fuel and the decarbonatation generating an exhaust gas, wherein decarbonated materials are cooled in the cooling zones with one or more cooling streams, said process further comprising cooling the decarbonated materials with the one or more cooling streams comprising a water steam stream, said stream being fed in the cooling zone of at least the first and/or the second shaft.

Classes IPC  ?

• C04B 2/12 - Préchauffage, cuisson, calcination ou refroidissement dans des fours à cuve ou dans des fours verticaux
• F27B 1/22 - Aménagement des échangeurs de chaleur
• F27B 1/24 - Refroidissement