Flue gas purification from SO2 and NOx using molten mixture of alkali metal carbonates
Dosmukhamedov N. Kaplan V.
2022Taylor and Francis Ltd.
International Journal of Coal Preparation and Utilization
2022#42Issue 103004 - 3015 pp.
Sulfur dioxide (SO2) and nitrogen oxides (NOx) in flue gas are a hazardous atmospheric pollutant associated with coal combustion and non-ferrous metal production. Here we report that laboratory pilot unit for scrubbing of industrial flue gas containing 80 ± 2 ppm SO2 followed by melt regeneration with either CO or natural gas, verified that only 1.5–2.0 ppm SO2 remained in the flue gas. The tests with the semi-industrial scale unit (271.26 kg of the eutectic carbonate melt and flue gas containing 0.15% SO2, 13 ppm NO, 52 ppm NO2) were received. In all tests, sulfur extraction from flue gas to the carbonate melt was >90–95% and nitrogen oxides extraction from flue gas to the carbonate melt was 60%. Sulfur and nitrogen oxides extraction from carbonate–sulfate–nitrite melt during regeneration stage was >99%. Carbonate melt-based SO2 scrubbing therefore represents a practical and economical method for limiting sulfur and NOx emission to the atmosphere from both coal-firing power stations and non-ferrous metallurgical processing plants.
carbonate eutectic melt , coal-firing power stations , environmental pollutant , flue gas , SO2 and NOx emission
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Department of Metallurgy and Mineral Processing, K.I. Satpayev Kazakh National Research Technical University, Kazakhstan
Molecular Chemistry and Materials Science Department, Weizmann Institute of Science, Rehovot, Israel
Department of Metallurgy and Mineral Processing
Molecular Chemistry and Materials Science Department
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