Citation: DAI Xin, BAI Jin, LI Dong-tao, YUAN Ping, YAN Ting-gui, KONG Ling-xue, LI Wen. Experimental and theoretical investigation on relationship between structures of coal ash and its fusibility for Al₂O₃-SiO₂-CaO-FeO system[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(6): 641-648. shu

Experimental and theoretical investigation on relationship between structures of coal ash and its fusibility for Al₂O₃-SiO₂-CaO-FeO system

DAI Xin ^1,2 ,
BAI Jin ^3,, ,
LI Dong-tao ^1,2 ,
YUAN Ping ⁴ ,
YAN Ting-gui ⁵ ,
KONG Ling-xue ³ ,
LI Wen ³

1.
Shougang Group Research Institute of Technology, Beijing 100043, China
2.
Beijing Key Laboratory of Green Recyclable Process for Iron & Steel Production Technology, Beijing 100043, China
3.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
4.
Shanxi Research Institute for Clean Energy, Tsinghua University, Taiyuan 030032, China
5.
School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

Corresponding author: BAI Jin, stone@sxicc.ac.cn
Received Date: 14 January 2019
Revised Date: 25 March 2019

Fund Project: The project was supported by Joint Foundation of the Natural Science Foundation of China and Xinjiang Province (U1703252), Joint Foundation of the Natural Science Foundation of China and Shanxi Province (U1510201), NSFC-DFG (21761132032), National Natural Science Foundation of China (21808045) and National Key R & D Program of China (2017YFB0304300 & 2017YFB0304303)Joint Foundation of the Natural Science Foundation of China and Xinjiang Province U1703252National Key R & D Program of China 2017YFB0304300 & 2017YFB0304303NSFC-DFG 21761132032National Natural Science Foundation of China 21808045Joint Foundation of the Natural Science Foundation of China and Shanxi Province U1510201

Figures(9)

The molecular dynamics simulation, thermal dynamic calculation and experimental investigation were combined to illustrate ash slag viscosity variation mechanism for Al₂O₃-SiO₂-CaO-FeO system. The viscosity declines and the viscosity curve is transformed from crystalline slag to glassy slag with increasing mass ratio (C/F) of calcium to ferrous oxide in Al₂O₃-SiO₂-CaO-FeO system. There is an inflexion point when the C/F is equal to 2. When the C/F is below 2, there are mainly crystalline minerals in the system. While the C/F is above 2, there are mainly amorphous minerals in the system. With the increase of C/F, six-coordinated Al ([AlO₆]^9-) is transformed to four coordinated Al([AlO₄]^5-) microscopically. Besides, the content of bridging oxygen decreases while that of non-bridging oxygen increases. Quantified function between base composition and viscosity are constructed based on the stability coefficients defined by oxygen bond species.
- molecular dynamics simulation,
- thermal dynamic calculation,
- coal ash structure,
- oxygen bond species,
- calcium and ferrous oxide ratio
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Experimental and theoretical investigation on relationship between structures of coal ash and its fusibility for Al2O3-SiO2-CaO-FeO system

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Experimental and theoretical investigation on relationship between structures of coal ash and its fusibility for Al₂O₃-SiO₂-CaO-FeO system