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Forecast of coal spontaneous combustion based on the variations of functional groups and microcrystalline structure during low-temperature oxidation

机译：基于低温氧化过程中官能团和微晶结构的变化预测煤的自燃

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摘要

Variations of gas products and reaction characteristics of main functional groups during low-temperature oxidation of coals with different metamorphic degrees were analyzed based on the gas chromatographic analysis of gas products and the FTIR determination of oxidized coal samples. Meanwhile, changes in the microcrystalline structure parameters during the low-temperature oxidation were determined with the aid of the XRD technology. Since gas product contents of coal with different metamorphic degrees grow continuously with the rise of oxidation temperature, a forecast system that adopted CO and C2H4 as indicator gases in the low-temperature oxidation process was established. The content of -CH3/-CH2-, the primary participant in the oxidation reaction, gradually falls with the rise of oxidation temperature. During the low-temperature oxidation of coal, the stacking height L-c, ductility L-a, stacking layer N and graphitization degree P of aromatic layers all increase with the rise of oxidation temperature. Finally, the critical temperature ranges (80-110 degrees C for RL coal, 110-140 degrees C for YL coal and 130-170 degrees C for WY coal) for drastic changes during low-temperature oxidation were proposed by comparatively analyzing the variation laws of gas products, main reaction functional groups and aromatic layers, as well as the corresponding temperature variations.
机译：基于气体产物的气相色谱分析和煤样品的FTIR测定，分析了不同变质度的煤在低温氧化过程中气态产物的变化和主要官能团的反应特性。同时，借助XRD技术确定了低温氧化过程中微晶结构参数的变化。由于不同变质程度的煤的气体产物含量随氧化温度的升高而持续增长，因此建立了以CO和C2H4为指示气的低温氧化过程预报系统。氧化反应的主要参与者-CH3 / -CH2-的含量随着氧化温度的升高而逐渐下降。在煤的低温氧化过程中，芳烃层的堆积高度L-c，延展性L-a，堆积层N和石墨化度P均随氧化温度的升高而增加。最后，通过比较分析变化规律，提出了低温氧化过程中剧烈变化的临界温度范围（RL煤为80-110℃，YL煤为110-140℃，WY煤为130-170℃）。气体产物，主要反应官能团和芳族层的组成以及相应的温度变化。

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  • 来源
    《Fuel》 |2019年第1期|339-348|共10页
  • 作者

    Cai Jiawen; Yang Shengqiang; Hu Xincheng; Song Wanxin; Xu Qin; Zhou Buzhuang; Song Yawei;

  • 作者单位

    China Univ Min & Technol Minist Educ Key Lab Gas & Fire Control Coal Mines Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol State Key Lab Coal Resources & Safety Min Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Sch Safety Engn Xuzhou 221116 Jiangsu Peoples R China;

    Univ Alberta Dept Civil & Environm Engn Edmonton AB T6G 2W2 Canada;

    China Univ Min & Technol State Key Lab Coal Resources & Safety Min Xuzhou 221116 Jiangsu Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Functional groups; Microcrystalline structure; Coal spontaneous combustion; Forecast;

    机译：功能组;微晶结构;煤自燃;预测;

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