Abatement of SO_2–NOx binary gas mixtures using a ferruginous active absorbent:Part I. Synergistic effects and mechanism  

作　　者：Yinghui Han Xiaolei Li Maohong Fan Armistead G.Russell Yi Zhao Chunmei Cao Ning Zhang Genshan Jiang 

机构地区：[1]School of Mathematics and Physics, North China Electric Power University [2]School of Energy Resources and Department of Chemical & Petroleum Engineering, University of Wyoming [3]School of Civil and Environmental Engineering, Georgia Institute of Technology [4]Shanxi Electric Power Exploration & Design Institute,China's State Energy Group Co.

出　　处：《Journal of Environmental Sciences》2015年第4期55-64,共10页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 51308212, 10974053);the National Key Technology R&D Program (No. 2011BAI02B03);the Fundamental Research Funds for the Central Universities (No. 13ZD18);the State Scholarship Fund (No. 201206735009)

摘　　要：A novel ferruginous active absorbent, prepared by fly ash, industrial lime and the additive Fe（VI）, was introduced for synchronous abatement of binary mixtures of SO2–NOx from simulated coal-fired flue gas. The synergistic action of various factors on the absorption of SO2 and NOx was investigated. The results show that a strong synergistic effect exists between Fe（VI） dose and reaction temperature for the desulfurization. It was observed that in the denitration process, the synergy of Fe（VI） dose and Ca/（S ＋ N） had the most significant impact on the removal of NO, followed by the synergy of Fe（VI） and reaction temperature, and then the synergy of reaction temperature and flue gas humidity. A scanning electron microscope（SEM） and an accessory X-ray energy spectrometer（EDS）were used to observe the surface characteristics of the raw and spent absorbent as well as fly ash. A reaction mechanism was proposed based on chemical analysis of sulfur and nitrogen species concentrations in the spent absorbent. The Gibbs free energy, equilibrium constants and partial pressures of the SO2–NOx binary system were determined by thermodynamics.A novel ferruginous active absorbent, prepared by fly ash, industrial lime and the additive Fe（VI）, was introduced for synchronous abatement of binary mixtures of SO2–NOx from simulated coal-fired flue gas. The synergistic action of various factors on the absorption of SO2 and NOx was investigated. The results show that a strong synergistic effect exists between Fe（VI） dose and reaction temperature for the desulfurization. It was observed that in the denitration process, the synergy of Fe（VI） dose and Ca/（S ＋ N） had the most significant impact on the removal of NO, followed by the synergy of Fe（VI） and reaction temperature, and then the synergy of reaction temperature and flue gas humidity. A scanning electron microscope（SEM） and an accessory X-ray energy spectrometer（EDS）were used to observe the surface characteristics of the raw and spent absorbent as well as fly ash. A reaction mechanism was proposed based on chemical analysis of sulfur and nitrogen species concentrations in the spent absorbent. The Gibbs free energy, equilibrium constants and partial pressures of the SO2–NOx binary system were determined by thermodynamics.

关 键 词：Fe（VI） Desulfurization Denitration Binary gas Synergized effect Thermodynamics 

分 类 号：X701.3[环境科学与工程—环境工程]