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Traditional method of removing gas pollutants from a coal-fired power station involves a series of separate processes, which include selective catalytic reduction for NO_x treatment, flue gas desulfurisation for SO_x removal, and post-combustion CO₂ capture. Each of these individual processes involves significant capital investment. To reduce costs, we propose an alternative approach to simultaneously remove these three pollutants by incorporating NO_x/SO_x treatment into an aqueous NH₃-based CO₂ capture process. In our advanced process design, NO_x/SO_x pollutants are effectively scrubbed by sodium chlorite (NaClO₂) oxidizing reagent, with the resultant acidic solution efficiently reducing NH₃ emissions from CO₂ absorber to <1 ppmv. An advanced, NH₃-based flash stripper is used to achieve high capture energy performance, and flue gas heat integration is employed to further reduce the regeneration …