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Citation: SUN Xin, ZHAO Bin, WANG Zi-bin, LIANG Jing-long, LI Hui. Effect of H2O(g) and SO2(g) on the volatilization and transformation of sodium during Xinjiang high-sodium coal combustion[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(10): 1178-1184. shu

Effect of H2O(g) and SO2(g) on the volatilization and transformation of sodium during Xinjiang high-sodium coal combustion

  • School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, China

  • Corresponding author: SUN Xin, sunxin8835@163.com
  • Received Date: 25 April 2017
    Revised Date: 3 August 2017

    Fund Project: The project was supported by the National Natural Science Foundation of China (514740013) and Natural Science Foundation of Hebei Province (E2016209163)the National Natural Science Foundation of China 514740013Natural Science Foundation of Hebei Province E2016209163

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  • Combustion experiment of Xinjiang coal with high sodium content was carried out in a horizontal tube furnace at 400-1 100℃. The occurrence of sodium in coal and ash was analyzed by sequential extraction method to study the release and transformation characteristics of sodium, especially the effect of H2O(g) and SO2(g) at 700℃ and 1 100℃. The results show that, the release ratio of sodium in coal increases gradually with the increase of temperature. The sodium in organic form vaporizes first, followed by water-soluble inorganic sodium, while the inorganic sodium in the form of aluminosilicate is difficult to vaporize due to high thermal stability. At lower temperature (700℃), H2O(g) has a negative effect on the volatilization of sodium, while at higher temperature (1 100℃), the reductive atmosphere formed by the reaction of char and H2O(g) promotes the volatilization of sodium. When the proportion of H2O(g) is larger than 20% in inlet gas, the promotion effect of H2O(g) is weakened. SO2 can inhibit sodium volatilization, while the inhibiting effect of SO2 becomes less significant as the temperature increases from 700℃ to 1 100℃. In the presence of both H2O(g) and SO2, the sodium volatilization at 700℃ is inhibited. The combination effect of H2O(g) and SO2 at 1 100℃ depends on its concentration. Under the atmosphere containing 20%H2O and 2.0×10-3 SO2 the total volatilization ratio of sodium increases from 86% to 87.1%.
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