A novel additive for the reduction of acid gases and NOx in municipal waste incinerator flue gas

Abstract

The reduction of SO₂, HCl, and NO_x concentrations using calcium magnesium acetate (CMA) as a novel sorbent in a simulated municipal waste incinerator flue gas was investigated. The reduction of individual SO₂, HCl, and NO_x concentrations was tested at 850°C and it was found that CMA could reduce the SO₂ concentration by 74%, HCl concentration by 64%, or NO_x concentration by 94%. It was observed that individual SO₂ or HCl capture increased with increasing initial oxygen concentration in the reacting gas or increasing sorbent input. NO_x reduction decreased with increasing initial oxygen concentration in the reacting gas. The simultaneous reduction of SO₂, HCl, and NO_x concentrations by CMA was also investigated. It was found that CMA could simultaneously capture 60% SO₂ and 61% HCl and reduce NO_x concentrations by 26%, when the initial oxygen concentration in the reacting gas was 4%. During the simultaneous reduction of SO₂, HCl, and NO_x, it was noted that as the initial oxygen concentration in the reacting gas increased, the efficiency of SO₂ capture increased too, but the efficiency of HCl capture and the efficiency of NO_x destruction decreased.