Split, Partial Oxidation and Mixed Absorption: A Novel Process for Synergistic Removal of Multiple Pollutants from Simulated Flue Gas

In this paper, a new method of split, partial oxidation and mixed absorption for the synergistic removal of SO2, NOx, and Hg0 is proposed. Factors that affect the multipollutant removal, such as the flue gas split ratio, NaClO2 concentration, initial pH and temperature of NaClO2 solution in the oxidation reactor, SO2, NO, O2, and CO2 concentrations, gas flow rate, and species of alkali absorbent in the absorption reactor are investigated, with a special focus on NOx removal. Results show that SO2 and Hg0 are removed quite efficiently and are slightly affected by reaction conditions, whereas NOx removal is seriously affected by the above factors, except for O2 and CO2 concentrations. Under the best experimental conditions, the average removal efficiencies of SO2, NOx, and Hg0 reach more than 99, 82, and 95%, respectively. Meanwhile, the mechanism of multipollutant removal is deduced based on related literature, experimental phenomena, and reaction products. The novel process has enormous potential in the r...