Citation: LI Wen-ju, GONG Ben-gen, ZHANG Jun-ying. Study on the mineral transformation and heavy metal distribution during high-silicon coal combustion[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(12): 1488-1497. shu

Study on the mineral transformation and heavy metal distribution during high-silicon coal combustion

1.
Zhengzhou Electric Power College, Zhengzhou 450000, China
2.
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, China

Corresponding author: ZHANG Jun-ying, jyzhang@hust.edu.cn
Received Date: 9 September 2020
Revised Date: 13 October 2020

Fund Project: Key Scientific Research Projects of Colleges and Universities in Henan Province 20B610007the National Key Research and Development Program of China 2017YFB0603101National Natural Science Foundation of China 41672148Soft Science Project of Henan Science and Technology Department 202400410295The project was supported by the National Key Research and Development Program of China (2017YFB0603101), National Natural Science Foundation of China (41672148), Soft Science Project of Henan Science and Technology Department (202400410295) and Key Scientific Research Projects of Colleges and Universities in Henan Province (20B610007)

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The high-silicon coal in Xuanwei area of Yunnan is selected to study the transformation behavior of minerals and the distribution and enrichment of heavy metals during the combustion process. The minerals in high-silicon coal are mainly composed of quartz, kaolinite, pyrite and anatase. The mullite in fly ash may come from the transformation of quartz and kaolinite in coal; the quartz in fly ash mainly comes from the original quartz component in coal or is formed by the conversion of SiO₂-Al₂O₃ system. Analyzing the enrichment characteristics of several heavy metals in high-silicon coal and its fly ash, it can be found that Cr, Cu, and As are enriched in the high-silicon coal, and Mo is the heavy metal enriched in the electric fields of the ESP, while Se contents in high-silicon coal and fly ash in China are both lower than the world average level. The contents of radioactive elements of Th and U in the fine-particle high-silicon fly ash are higher than the average of world coal ash, and the enrichment factors in the fly ash in the four electric fields of the ESP are 1.51 and 1.59, respectively.
- high-silicon coal,
- coal combustion,
- fly ash,
- mineral transformation,
- heavy metals
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