Citation: WANG Yang, LI Hui, WANG Dong-xu, DONG Chang-qing, LU Qiang, LI Wen-yan. Relationship between coal ash fusibility and ash composition in terms of mineral changes[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(9): 1034-1042. shu

Relationship between coal ash fusibility and ash composition in terms of mineral changes

WANG Yang ¹ ,
LI Hui ¹ ,
WANG Dong-xu ² ,
DONG Chang-qing ^1,*,, ,
LU Qiang ¹ ,
LI Wen-yan ²

1.
National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
2.
School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Corresponding author: DONG Chang-qing, cqdong1@163.com
Received Date: 15 April 2016
Revised Date: 5 June 2016

Fund Project: the Fundamental Research Funds for the Central Universities 2015ZZD02the Major State Basic Research Development Program of China 2015CB251501National Nature Science Foundation of China 51276062the Major State Basic Research Development Program of China 973 program

Figures(11)

Coal ash and synthetic ash samples were used to detect effect of different ash components on ash fusion temperatures (AFTs). Thermodynamic database FactSage 7.0 was applied to simulate the melting process of ashes with different compositions, in order to provide theoretical basis for effect of ash components on ash fusibility. The reducing effect of Na₂O on AFTs is due to the replacement of anorthite by albite and nepheline. The increasing content of MgO can initially lower and then raise the AFTs. When MgO exceeds certain content, forsterite is generated and raise the AFTs. The raising effect of sulfur on AFTs is due to the replacement of diopside by forsterite and calcium sulfate. The increasing content of CaO can also initially lower and then raise the AFTs. When CaO exceeds certain level, Si migrates from minerals with low melting points to those with higher melting points, thus raising the AFTs. Na₂O is prior to CaO when being bound with silica-oxygen units to form minerals. The priority order of the oxides when being bound with CaO and silica-oxygen units is: Al₂O₃ > MgO > Fe₂O₃.
- ash fusibility,
- mineral conversion,
- thermodynamic simulation
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