Citation: CHEN Xiao-dong, KONG Ling-xue, BAI Jin, BAI Zong-qing, LI Wen. Effect of Na₂O on mineral transformation of coal ash under high temperature gasification condition[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(3): 263-272. shu

Effect of Na₂O on mineral transformation of coal ash under high temperature gasification condition

CHEN Xiao-dong ^1,2 ,
KONG Ling-xue ¹ ,
BAI Jin ^1,*,, ,
BAI Zong-qing ¹ ,
LI Wen ¹

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: BAI Jin, stone@sxicc.ac.cn
Received Date: 15 September 2015
Revised Date: 9 December 2015

Fund Project: The project was supported by the National Natural Science Foundation of China 21476247Shanxi Province Science Foundation for Youths 2015021055and Joint Foundation of Natural Science Foundation of China and Shanxi Province U1510201The project was supported by the National Natural Science Foundation of China 21406254

Figures(7)

In order to reveal the mechanism of Na₂O influence on ash fusion temperatures (AFTs), effect of Na₂O on mineral transformation of two coal ashes with different SiO₂+Al₂O₃ levels were investigated by XRD and FT-IR under reducing atmosphere at high temperature. Thermodynamic software package FactSage was used to calculate the ΔG of reactions between minerals to reveal the mechanism of Na₂O influence on mineral transformation. It is found that the effect of Na₂O on mineral compositions depends on SiO₂+Al₂O₃ levels of coal ash. For ash with 82.89% SiO₂+Al₂O₃ while Na₂O content is 5%-20%, albite and nepheline are formed, leading to a decrease of AFTs. However, only nepheline is formed when Na₂O content is higher than 20%. For ash with 47.85% SiO₂+Al₂O₃, when Na₂O content is less than 10%, no Na-containing mineral is observed. When Na₂O content is higher than 10%, Na-containing minerals such as combeite, lazurite and sodium aluminium oxide are formed, resulting in a decrease of AFTs. Furthermore, FactSage results reveal that Na-containing mineral is easily formed at high temperature due to low ΔG of the reactions.
- high temperature gasification,
- Na₂O,
- mineral matter,
- AFTs
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Effect of Na₂O on mineral transformation of coal ash under high temperature gasification condition