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

Fang, Ping, Tang, Zijun, Chen, Xiongbo, Huang, Jianhang, Chen, Dingsheng, Tang, Zhixiong, Cen, Chaoping
Industrial & engineering chemistry process design and development 2017 v.56 no.17 pp. 5116-5126
absorbents, absorption, carbon dioxide, flue gas, mercury, methodology, nitric oxide, oxidation, oxygen, pH, pollutants, process design, sulfur dioxide, temperature
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 removal of multipollutants from flue gas.