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

Figures(8)

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%.
- Xinjiang high-sodium coal,
- SO₂,
- H₂O(g),
- volatilization,
- speciation transformation
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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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