Citation: SHEN Yan-feng, WANG Mei-jun, HU Yong-feng, KONG Jiao, BAO Wei-ren, CHANG Li-ping. Effect of chemical structure and sulfur speciation of high-sulfur coking coals on sulfur transformation during pyrolysis[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(2): 144-153. shu

Effect of chemical structure and sulfur speciation of high-sulfur coking coals on sulfur transformation during pyrolysis

1.
Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, China
2.
Shanxi Coking Coal Group Co. LTD, Taiyuan 030024, China
3.
Canadian Light Source, Saskatoon, SK S7N 2V3, Canada

Corresponding author: WANG Mei-jun, wangmeijun@tyut.edu.cn
Received Date: 22 November 2019
Revised Date: 21 December 2019

Fund Project: The project was supported by National Natural Science Foundation of China U1910201Research Project Supported by Shanxi Scholarship Council of China 2017-03The project was supported by National Natural Science Foundation of China(21878208, 21808152, U1910201), Research Project Supported by Shanxi Scholarship Council of China (2017-03) and Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi (TSTAP)The project was supported by National Natural Science Foundation of China 21808152The project was supported by National Natural Science Foundation of China 21878208

Figures(10)

The chemical structure, content and distribution of sulfur forms in coal and coke of four high-sulfur coking coals were characterized by FT-IR, Raman, TG, and sulfur K-edge XANES technique, and effects on sulfur transformation during pyrolysis were also investigated. The results show that sulfur transformation behavior is related to the sulfur forms in coal as well as the release of volatile matters during pyrolysis. For lower rank coking coals, decomposition of unstable aliphatic structure releases plenty of volatiles with wider range. The interactions between sulfur radicals from cleavage of sulfur forms and hydrogen-rich radicals in volatiles promote release of sulfur into gas phase. This increases total sulfur removal and results in the higher content of thiophene in coke bulk than that on coke surface, while sulfide compounds have an opposite distribution. The degree of aromatization and relative content of thiophene increase with increasing coal rank, leading to lower desulfurization rate and unapparent difference of sulfur distribution between bulk and surface of coke. Inorganic sulfur removal is related to degree of decomposition of pyrite directly, and inter-conversions of sulfur species during pyrolysis process would generate new inorganic sulfur and retain in coke ultimately. Organic sulfur removal is determined by the coal structure and organic sulfur forms, and decreases obviously with increasing coal rank.
- high-sulfur coking coal,
- pyrolysis,
- chemical structure,
- sulfur forms,
- XANES
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沈阳化工大学材料科学与工程学院沈阳 110142