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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

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Front. Environ. Sci. Eng.    2015, Vol. 9 Issue (2) : 222-229    https://doi.org/10.1007/s11783-014-0636-2
RESEARCH ARTICLE
Activity and characteristics of “Oxygen-enriched” highly reactive absorbent for simultaneous flue gas desulfurization and denitrification
Yi ZHAO(),Tianxiang GUO,Zili ZANG
School of Environmental Science & Engineering, North China Electric Power University, Baoding 071003, China
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Abstract

An “Oxygen-enriched” highly reactive absorbent was prepared by mixing fly ash, lime and a small quantity of KMnO4 for simultaneous desulfurization and denitrification. Removal of SO2 and NO simultaneously was carried out using this absorbent in a flue gas circulating fluidized bed (CFB). The highest simultaneous removal efficiency, 94.5% of SO2 and 64.2% of NO, was achieved under the optimal experiment conditions. Scanning Electron Microscope (SEM) and Accessory X-ray Energy Spectrometer (EDX) were used to observe the surface characteristics of fly ash, lime, “Oxygen-enriched” highly reactive absorbent and the spent absorbent. An ion chromatograph (IC) and chemical analysis methods were used to determine the contents of sulfate, sulfite, nitrate and nitrite in the spent absorbents, the results showed that sulfate and nitrite were the main products for desulfurization and denitrification respectively. The mechanism of removing SO2 and NO simultaneously was proposed based on the analysis results of SEM, EDX, IC and the chemical analysis methods.
Keywords “Oxygen-enriched” highly reactive absorbent      Surface characteristics      Flue gas circulating fluidized bed      Simultaneous desulfurization and denitrification     
Corresponding Author(s): Yi ZHAO   
Online First Date: 18 February 2014    Issue Date: 13 February 2015
 Cite this article:   
Yi ZHAO,Tianxiang GUO,Zili ZANG. Activity and characteristics of “Oxygen-enriched” highly reactive absorbent for simultaneous flue gas desulfurization and denitrification[J]. Front. Environ. Sci. Eng., 2015, 9(2): 222-229.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-014-0636-2
https://academic.hep.com.cn/fese/EN/Y2015/V9/I2/222
substances fly ash industrial lime “oxygen-enriched” highly reactive absorbent
specific surface area/(m2·g-1) 5.6 12.1 55.1
Tab.1  Surface properties of fly ash, industrial lime and “oxygen-enriched” highly reactive absorbent
Fig.1  The experimental apparatus of flue gas CFB system
Fig.2  The effect of contents of KMnO4 on the efficiencies of desulfurization and denitrification
items efficiencies 1 2 3 4 5 average sample variance, S2
SO2 % 94.1 95.4 94.8 93.5 94.7 94.5 0.42
NO % 64.9 64.5 63.1 63.8 64.7 64.2 0.44
Tab.2  Parallel experimental results of desulphurization and denitrification
Fig.3  Surface of fly ash particle (3000X)
Fig.4  Surface of Industrial lime particles (3000X)
Fig.5  Surface of “Oxygen-enriched” highly reactive absorbent (700X) (A,B,C are for the part of erosive traces)
Fig.6  Surface of the spent absorbent (980X)
samples relative contents of the main elements
Al Si K Ca Ti Fe Mn
fly ash 18.15 27.91 0.82 0.70 0.54 2.19
“oxygen-enriched” highly reactive absorbent 18.71 30.48 2.16 40.24 0.79 4.44 3.19
Tab.3  Relative contents of the main elements on the surface of fly ash and “Oxygen-enriched” highly reactive absorbent
Fig.7  Average energy spectrum on the surface of the “Oxygen-enriched ”highly reactive absorbent
Fig.8  Average energy spectrum on the surface of the spent absorbent
the contents of sulfur and nitrogen species in unreacted absorbent the contents of sulfur and nitrogen species in spent absorbent
[SO42-] [SO32-] [NO—] [NO3—] [SO42-] [SO32-] [NO2—] [NO3—]
0.002 0 0 0 0.999 0.538 0.555 0.186
Tab.4  Contents of sulfur and nitrogen species in unreacted absorbent and spent absorbent (mmol·g-1)
Fig.9  Ion chromatogram of the spent absorbent
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