Impact of enhancer of low rank pulverized coal in the process of preparation of formed coke

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Abstract In order to solve the problem of low strength of formed coke products prepared from low-rank pulverized coal, this paper takes low low-rank pulverized coal (HL) as raw material, coal pitch (LQ) binder, and addition of benzene homologues as the main fortifying agent (AC). The formed coke was prepared using cold pressing molding pyrolysis technology, and the optimum process conditions for formed coke preparation were determined. The formed coke was analyzed and characterized by FT-IR and four component extraction, and the strengthening mechanism of AC addition on the formed coke compressive strength was discussed. The results showed that under the conditions of LQ addition ratio of 35%, pyrolysis temperature of 900 ℃ and retention time of 120 min, when AC addition ratio of 3%, the formed coke compressive strength could be increased from 20.00 MPa to 26.22 MPa. AC can reduce the repulsive force between raw materials to make them more closely combined, and undergo substitution reactions with functional groups such as —CH₃ and —OH, resulting in an increase in the relative contents of aliphatic —CH, aromatics C＝C and C—O by 429.52%, 186.56% and 119.00%, respectively. Meanwhile, the activities of aliphatic hydrocarbon and aromatic hydrocarbons were enhanced and more aromatic compounds were generated during pyrolysis process. The asphaltene and pre-asphaltene contents increased by 3.5% and 2.0% respectively, which led to an increase in the colloidal body content, enhanced coking performance, and improved the formed coke compressive strength.

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	WANG Chaofan
	SONG Yonghui
	YIN Ning
	SHEN Xiaorui
	LI Liang
	LAN Xinzhe

Keywords： low rank pulverized coal coal pitch activator formed coke compressive strength

Received 2023-04-13;

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WANG Chaofan, SONG Yonghui, YIN Ning, SHEN Xiaorui, LI Liang, LAN Xinzhe.Impact of enhancer of low rank pulverized coal in the process of preparation of formed coke[J] Chemcial Industry and Engineering, 2025,V42(2): 89-96

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