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 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.