Insight Into Upgrading Caking Property of Shenmu Long Flame Coal Using Low-temperature Slow Pyrolysis Treatment

IF 0.4 Q4 ENGINEERING, CHEMICAL

Coke and Chemistry Pub Date : 2024-05-13 DOI:10.3103/S1068364X24600118

Kangshun Han, Yuan Fang, Shixian Fang, Xiangchun Liu, Ping Cui

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Abstract

We proposed a low-temperature slow pyrolysis treatment (LTSPT) to improve the caking property of Shenmu long flame coal (SMCY). To reveal the factors affecting the caking property of SMCY, Fourier transform infrared spectroscopy, solid-state ¹³C nuclear magnetic resonance spectroscopy, Raman spectroscopy, and pyrolysis-gas chromatography with mass spectrometric were used to analyze the changes in the chemical properties of the pyrolysis products. The results showed that LTSPT could significantly improve the caking index of SMCY, and it increased with the increase in temperature. LTSPT could decrease the content of oxygen; therefore, the consumption of hydrogen decreased, indicating that the increased hydrogen radicals can be produced, which serve as stabilizers for the aromatic radicals generated from coal pyrolysis. As a result, relatively high-molecular weight aromatic free radicals are inhibited from cross-linking into semi-coke. On the other hand, SMCY with a suitable upgrading degree possessed a suitable content of aromatic hydrocarbons, which are precursors of caking components. The combined effects of the abovementioned two factors led to the increase in caking index.

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利用低温缓慢热解处理提升神木长焰煤结块性能的见解

摘要我们提出了一种低温缓慢热解处理方法（LTSPT）来改善神木长焰煤（SMCY）的结块性能。为揭示影响神木长焰煤结块性能的因素，采用傅立叶变换红外光谱、固态 13C 核磁共振波谱、拉曼光谱和热解-气相色谱-质谱联用技术分析了热解产物化学性质的变化。结果表明，LTSPT 能显著改善 SMCY 的结块指数，且结块指数随温度的升高而增加。LTSPT 可以降低氧气含量，从而减少氢气消耗，这表明增加的氢自由基可以作为煤热解产生的芳香自由基的稳定剂。因此，相对高分子量的芳香族自由基受到抑制，无法交联成半焦。另一方面，具有适当升级度的 SMCY 具有适当的芳香烃含量，而芳香烃是结块成分的前体。上述两个因素的共同作用导致了结块指数的增加。

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来源期刊

Coke and Chemistry ENGINEERING, CHEMICAL-

CiteScore

0.70

自引率

50.00%

发文量

期刊介绍： The journal publishes scientific developments and applications in the field of coal beneficiation and preparation for coking, coking processes, design of coking ovens and equipment, by-product recovery, automation of technological processes, ecology and economics. It also presents indispensable information on the scientific events devoted to thermal rectification, use of smokeless coal as an energy source, and manufacture of different liquid and solid chemical products.