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

Author:
Fang, Ping, Tang, Zijun, Chen, Xiongbo, Huang, Jianhang, Chen, Dingsheng, Tang, Zhixiong, Cen, Chaoping
Source:
Industrial & engineering chemistry process design and development 2017 v.56 no.17 pp. 5116-5126
ISSN:
1520-5045
Subject:
absorbents, absorption, carbon dioxide, flue gas, mercury, methodology, nitric oxide, oxidation, oxygen, pH, pollutants, process design, sulfur dioxide, temperature
Abstract:
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.
Agid:
6008707