The Effects of Flue Gas SO3 on the Operation of Coal-Fired Units and Countermeasures
International Journal of Energy and Power Engineering
Volume 7, Issue 3, June 2018, Pages: 27-32
Received: Apr. 24, 2018; Accepted: May 14, 2018; Published: Jun. 1, 2018
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Hu Yufeng, State Key Laboratory of Clean and Efficient Coal-Fired Power Generation and Pollution Control, Guodian Science and Technology Research Institute, Nanjing, China
Xue Jianming, State Key Laboratory of Clean and Efficient Coal-Fired Power Generation and Pollution Control, Guodian Science and Technology Research Institute, Nanjing, China
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There exists a certain amount of SO3 in flue gas discharged from coal-fired power plants. The implementation and “ultra-low emission” retrofitting of SCR in China greatly increased the concentration of SO3 in flue gas, which will lead to fouling, erosion and plugging of the SCR reactor and the air preheater downstream. With the lowered dew point of the flue gas, the ammonia sliped from the SCR reactor together with the SO3 in flue gas will leads to dust accumulation in the Electric Precipitator or in the Bag-house Filter, too. In this study, the main effects and its mechanism of SO3 on the safety, stability and efficiency of units were analyzed, and measures to control SO3 were proposed.
Coal-Fired Flue Gas, SO3, Operation of Units, Control of SO3
To cite this article
Hu Yufeng, Xue Jianming, The Effects of Flue Gas SO3 on the Operation of Coal-Fired Units and Countermeasures, International Journal of Energy and Power Engineering. Vol. 7, No. 3, 2018, pp. 27-32. doi: 10.11648/j.ijepe.20180703.11
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
LOU QG. Study on the production of SO3 during the process of coal burning [J]. Enery Engineering, 2008(6): 46-49. (in Chinese).
FLEIG D, ALZUETA MU, NORMANN F, et al. Measurement and modeling of sulfur trioxide formation in a flow reactor under post-flame conditions [J]. Combustion and Flame, 2013, 160(6): 1142-1151.
LIU YM, SHU H, XU QS, et al. FT-IR study of catalytic oxidation of SO2 during the process of selective catalytic reduction of NO with NH3 over commercial catalysts [J]. Journal of Fuel Chemistry and Technology, 2015(8): 1018-1024. (in Chinese).
SVACHULA J, ALEMANY LJ, FERLAZZO N, et al. Oxidation of sulfur dioxide to sulfur trioxide over honeycomb DeNoxing catalysts [J]. Industrial & Engineering Chemistry Research, 1993, 32(5).
HIMES R. Summary of selective catalytic reduction system operational issues at low load [R]. Technical Update, 2010: 44.
LI Y, WU B, XU XC. Effects of SO2, SO3 and H2O on the dew point temperature of flue gas [J]. Journal of Environmental Sciences, 1997 (1): 127-131. (in Chinese).
ZHU CB, JIN BS, LI F, et al. Effects of SO2 Oxidation on SCR-DeNOx [J]. Boiler Technology, 2008, 39(3): 68-72. (in Chinese).
MA SC, JIN X, SUN YX, et al. Formation mechanism and control of ammonium bisulfate in SCR flue gas denitrification process [J]. Thermal Power Generation, 2010, 39(8): 12-17. (in Chinese).
SHU H, ZHANG YH, FAN HM, et al. FT-IR study of formation and decomposition of ammonium bisulfates on surface of SCR catalyst for nitrogen removal [J]. CIESC Journal, 2015, 66(11): 4460-4468. (in Chinese).
WU DL, WANG J, ZHANG GX, et al. Analysis on air preheater blockage of 660 MW SCR denitration units and countermeasures [J]. Zhejiang Electric Power, 2014(3): 46-50. (in Chinese).
QI LQAN YT, SHI YW. Influence of SO3 on Electrostatic Precipitation of Fine Particles in Flue Gas [J]. Journal of Chinese Society of Power Engineering, 2011, 31(7): 539-543. (in Chinese).
SHEN Yanmei, DONG Kun, CUI Zhiyong, et al. The theoretical calculation of designed temperature of flue gas in low-low temperature electrostatic precipitator and the existing problems [J]. Electric Power, 2016, 49(7): 151-156. (in Chinese).
WANG Z, HUAN Q, QI C, et al. Study on the removal of coal smoke SO3 with CaO [J]. Energy Procedia, 2012, 14: 1911-1917.
MAZIUK J. Dry sorbent injection of trona for SOx mitigation [C]. European Conference on Biomedical Optics, 2001: 85-99.
WANG HL, XUE JM, XU YY, et al. Formation and control of SO3 from coal-fired power plants [J]. Electric Power Environmental Protection, 2014(5): 17-20. (in Chinese).
Wang H, Chen D, Li Z, et al. SO3 Removal from Flue Gas with Ca(OH)2 in Entrained Flow Reactors [J]. Energy & Fuels, 2018, 32(4):5364–5373.
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