Structural difference of gas coal separation components and its effect on sulfur transformation during pyrolysis of high sulfur coal

CHENG Chun-sheng; SHEN Yan-feng; GUO Jiang; KONG Jiao; WANG Mei-jun; CHANG Li-ping

doi:10.1016/S1872-5813(21)60091-9

Volume 49 Issue 9

Sep. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(9): 1219-1230

CHENG Chun-sheng, SHEN Yan-feng, GUO Jiang, KONG Jiao, WANG Mei-jun, CHANG Li-ping. Structural difference of gas coal separation components and its effect on sulfur transformation during pyrolysis of high sulfur coal[J]. Journal of Fuel Chemistry and Technology, 2021, 49(9): 1219-1230. doi: 10.1016/S1872-5813(21)60091-9

Citation:

CHENG Chun-sheng, SHEN Yan-feng, GUO Jiang, KONG Jiao, WANG Mei-jun, CHANG Li-ping. Structural difference of gas coal separation components and its effect on sulfur transformation during pyrolysis of high sulfur coal[J]. Journal of Fuel Chemistry and Technology, 2021, 49(9): 1219-1230. doi: 10.1016/S1872-5813(21)60091-9

Citation:

CHENG Chun-sheng, SHEN Yan-feng, GUO Jiang, KONG Jiao, WANG Mei-jun, CHANG Li-ping. Structural difference of gas coal separation components and its effect on sulfur transformation during pyrolysis of high sulfur coal[J]. Journal of Fuel Chemistry and Technology, 2021, 49(9): 1219-1230. doi: 10.1016/S1872-5813(21)60091-9

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Structural difference of gas coal separation components and its effect on sulfur transformation during pyrolysis of high sulfur coal

doi: 10.1016/S1872-5813(21)60091-9

CHENG Chun-sheng^{1, 2
,},
SHEN Yan-feng^{1, 2},
GUO Jiang^{1, 2},
KONG Jiao^{1, 2},
WANG Mei-jun^{1, 2
,
,},
CHANG Li-ping^{1, 2}

1.
State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China
2.
Key Laboratory of Coal Science and Technology, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China

Funds: The project was supported by National Natural Science Foundation of China (U1910201, 21878208, 21808152), Shanxi Province Science Foundation for Key Program (201901D111001(ZD)) and Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi

Received Date: 2021-02-05
Rev Recd Date: 2021-04-01

Available Online: 2021-04-30

Publish Date: 2021-09-30

Abstract

Abstract

Two gas coals were respectively separated into four components with different vitrinite content using ZnCl₂ solution. The carbon structure, composition of coal macerals and minerals, and plastic layer behavior of separating components were characterized by nuclear magnetic resonance spectrometer (¹³C NMR), coal rock analyzer, X-ray fluorescence spectrometry (XRF) and Gieseler fluidity. Combining with X-ray photoelectron spectroscopy (XPS), effect of different gas coal separation components on sulfur transformation behavior during pyrolysis of high-sulfur coal and distribution of sulfur forms in coke was investigated. The results show that with increase of vitrinite content in gas coal, the relative ratio of aliphatic carbon in coal increases, and the release amount of volatiles increases during pyrolysis; hydrogen free radicals in volatiles promote decomposition of sulfur, stabilize sulfur free radicals in time and release as sulfur-containing gases, and thus sulfur content in coke is reduced. Low density components in gas coal have the largest maximum fluidity and widest plastic range, and stability of plastic layer is the best during co-pyrolysis with high sulfur coal. The basic minerals in gas coal are mainly enriched in high density components, which leads to increase of sulfide sulfur and sulfate sulfur in the coke. For utilization of gas coal in coal-blending pyrolysis, enrichment of vitrinite and selection of coals with easier removal of alkaline minerals are beneficial for reducing sulfur in coke.
- gas coal,
- separation,
- high sulfur coal,
- sulfur transformation,
- plastic layer,
- alkaline minerals

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References(28)

References

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