Vacuum swing calcination process to produce high purity CO2 from CaCO3
This invention discloses a calcination process to produce high purity CO2 from solids containing CaCO3 which operates cyclically and continuously on the solids, arranged in a packed or a moving bed, and wherein each cycle comprises a first step where the combustion at atmospheric pressure of a fuel in the bed of solids containing CaCO3 heats them up to 800-900ºC and a second step wherein a vacuum pressure between 0.05 and 0.5 atm is applied to extract pure CO2 from the solids containing CaCO3 while cooling them by 30-200ºC. Said combustion can be carried out directly with air, oxygen enriched air or O2/CO2 mixtures when the process is applied to the calcination of a continuous flow of limestone in a moving bed shaft kiln. The process is also applied to calcine CaCO3 formed in reversible calcium looping processes comprising a carbonation reaction step to form CaCO3 from CaO.
| Main Authors: | , , |
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| Format: | solicitud de patente biblioteca |
| Language: | English |
| Published: |
2022-12-07
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| Online Access: | http://hdl.handle.net/10261/300820 |
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| Summary: | This invention discloses a calcination process to produce high purity CO2 from solids containing CaCO3 which operates cyclically and continuously on the solids, arranged in a packed or a moving bed, and wherein each cycle comprises a first step where the combustion at atmospheric pressure of a fuel in the bed of solids containing CaCO3 heats them up to 800-900ºC and a second step wherein a vacuum pressure between 0.05 and 0.5 atm is applied to extract pure CO2 from the solids containing CaCO3 while cooling them by 30-200ºC. Said combustion can be carried out directly with air, oxygen enriched air or O2/CO2 mixtures when the process is applied to the calcination of a continuous flow of limestone in a moving bed shaft kiln. The process is also applied to calcine CaCO3 formed in reversible calcium looping processes comprising a carbonation reaction step to form CaCO3 from CaO. |
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