Simultaneous Removal of CO ₂ , SO ₂ , and NO <i> _x </i> Using a Packed Column and High‐Performance Rotating Reactor Integrated Absorption System

ABSTRACT In Vietnam, a developing country with rapidly growing industrial activity, small‐ to medium‐scale boilers and waste incinerators are widely used. Absorption systems such as columns or scrubbers are commonly applied for NO x and SO 2 removal. A hybrid system that combines existing packed columns with a HiGee contactor is a promising solution for retrofitting existing plants in improving pollution control and practicing carbon capture. This study aims to provide insights into the proposed concept by investigating the flue gas treatment performance of an integrated system comprising a pilot‐scaled packed column (PC) and a lab‐scaled high‐performance rotating reactor. The effect of rotating speed of the HP2R (ω = 100–700 rpm), flue gas flow rate ( Q G = 25–150 L/min), absorbent flow rate in the PC ( Q L1 = 0.05–0.35 L/min) and in the HP2R ( Q L2 = 0.05–0.35 L/min) on the removal efficiency of CO 2 , SO 2 , and NO x from simulated flue gas were evaluated in a laboratory‐scale setup. The results indicated the enhancement of CO 2 and NO x removal efficiencies by approximately 30–50% compared with the standalone PC unit at ω = 500–700 rpm. Continuous operation further confirmed the system's stability in multi‐pollutant removal, particularly for SO 2 and NO x , although CO 2 capture performance was found to be sensitive to absorbent pH, emphasizing the need for effective absorbent regeneration to sustain long‐term operation.