TG-FTIR study on escape behavior of products from co-pyrolysis of coal and residuum

Q3 Energy

燃料化学学报 Pub Date : 2024-04-01 DOI:10.1016/S1872-5813(23)60393-7

Xiao-dong ZHOU , Hao WU , Jing-mei LIU , Xue-li HUANG , Ting LIU , Mei ZHONG , Feng-yun MA

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Abstract

Coal and residuum are first co-pyrolyzed, and then hydrogenated into small molecule products during co-liquefaction. Therefore, clarifying influence of residuum on coal pyrolysis performance is an important thermochemical basis for regulating the process. The co-pyrolysis behavior of atmospheric residuum (AR) and Naomaohu coal (NMH) were investigated by TG, TG-FTIR and distributed activation energy model. The results showed that the peak temperature of the maximum rate of weight loss for the co-pyrolysis process was reduced by 7 °C compared with the theoretical value calculated by weighted average of AR and NMH pyrolysis alone, while the weight loss increased by 3%, the average activation energy decreased by 23.6 kJ/mol. In addition, the peak area of alkyl O-containing functional groups such as alcohols and ethers increased, whereas those of CO and CO₂ decreased, suggesting that AR had a positive effect on NMH pyrolysis. Meanwhile, alkyl radicals from AR decomposition would combine with O-containing radicals generated from coal pyrolysis, thus resulting in a decrease of CO and CO₂ by inhibiting breakage of carboxyl groups. This work will provide a scientific evaluation basis for revealing the influence of residuum on composition of coal liquefaction product during co-liquefaction.

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煤和残渣共热解产物逸出行为的 TG-FTIR 研究

煤和残渣首先进行共热解，然后在共液化过程中加氢成为小分子产品。因此，明确残渣对煤热解性能的影响是调节煤热解过程的重要热化学基础。本文采用 TG、TG-FTIR 和分布活化能模型研究了常压残渣（AR）和直茂湖煤（NMH）的共热解行为。结果表明，与单独热解 AR 和 NMH 的加权平均计算的理论值相比，共热解过程的最大失重率峰值温度降低了 7 ℃，而失重率增加了 3%，平均活化能降低了 23.6 kJ/mol。此外，醇和醚等含烷基 O 的官能团的峰面积增大，而 CO 和 CO2 的峰面积减小，这表明 AR 对 NMH 热解有积极作用。同时，AR 分解产生的烷基自由基会与煤热解产生的含 O 自由基结合，从而通过抑制羧基的断裂减少 CO 和 CO2。这项工作将为揭示共液化过程中残留物对煤液化产物成分的影响提供科学的评价依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.