Modeling a Rotary Kiln Retrofitted by Energy Recovery for CO2 Capture

Calcium looping has been used for CO2 capture. High‐temperature calcination is needed to decompose CaCO3. To reduce the energy consumption of CaCO3 decomposition in calcium looping, a CaCO3 decomposition system integrating a rotary kiln, waste heat recovery by a single‐atom fluid, and the CaO carbon...

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Veröffentlicht in:Chemical engineering & technology 2023-05, Vol.46 (5), p.948-955
Hauptverfasser: Wang, Jiafeng, Yu, Yunsong, Zhang, Zaoxiao, Wang, Geoff G. X.
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Sprache:eng
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Zusammenfassung:Calcium looping has been used for CO2 capture. High‐temperature calcination is needed to decompose CaCO3. To reduce the energy consumption of CaCO3 decomposition in calcium looping, a CaCO3 decomposition system integrating a rotary kiln, waste heat recovery by a single‐atom fluid, and the CaO carbonization process is proposed. The waste heat recovery produces the electric field to intensify CO2 capture. A computational fluid dynamics model is established to study the effects of various parameters on the performance of the rotary kiln. It is found that the electric field enhances the mass transfer and CO2 capture. The system temperature is increased, resulting in significantly enhanced CO2 capture with increased feeding temperature. This provides an alternative way for CO2 capture. A computational fluid dynamics model considering CH4 combustion and CaCO3 reaction is developed to determine the performance of the rotary kiln for CO2 capture. Heat recovery is performed through a single‐atom fluid and the electricity generated by the heat recovery is used for the electric field.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.202200154