Modeling a Rotary Kiln Retrofitted by Energy Recovery for CO₂ Capture

Abstract

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.