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Surface CO/CO_2 ratio of char combustion measured by thermogravimetry and differential scanning calorimetry

机译：用热重分析和差示扫描量热法测量焦炭表面​​的CO / CO_2比

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摘要

Char combustion is the main stage in the coal-burning process. The CO/CO2 ratio near the surface of a char particle is an important physical quantity that determines the temperature of the particle and that can also help explore the mechanism of char combustion. In this paper, we propose an innovative method, i.e., thermo-gravimetry and differential scanning calorimetry, to explore the char combustion products from the perspective of heat release, and then we investigated the effect of combustion conditions on the CO/CO2 ratio. It was found that the CO/CO2 ratio first increased and then decreased with temperature from 600 degrees C to 900 degrees C, which confirmed the combined effect of both heterogeneous and homogeneous reactions on surface products. Further, by studying the transient products of char combustion, we observed that the CO/CO2 ratio showed a decreasing trend with the reaction processing at higher temperature, which might be due to the change of the carbon-oxygen reaction pathway. In addition, it was suggested that the main effect of oxygen concentration was on the homogeneous reaction, which will affect the relative value of the CO/CO2 ratio but hardly change the variation trend.
机译：焦炭燃烧是燃煤过程的主要阶段。炭颗粒表面附近的CO / CO2比是决定颗粒温度的重要物理量，也可以帮助探索炭燃烧的机理。在本文中，我们提出了一种创新的方法，即热重分析和差示扫描量热法，从放热的角度探讨了焦炭燃烧产物，然后研究了燃烧条件对CO / CO2比的影响。结果发现，CO / CO2比值随温度从600摄氏度下降到900摄氏度而先上升然后下降，这证实了异构反应和均相反应对表面产物的综合作用。此外，通过研究炭燃烧的瞬态产物，我们观察到CO / CO2比在较高温度下随反应过程呈下降趋势，这可能是由于碳-氧反应路径的变化所致。此外，有人认为氧浓度的主要影响是对均相反应的影响，这会影响CO / CO2比的相对值，但几乎不会改变变化趋势。

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  • 来源
    《Fuel》 |2018年第1期|480-485|共6页
  • 作者

    Zou Renjie; Luo Guangqian; Cao Liang; Jiang Liangkui; Li Xian; Yao Hong;

  • 作者单位

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, SKLCC, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, SKLCC, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, SKLCC, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, SKLCC, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, SKLCC, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, SKLCC, Wuhan 430074, Hubei, 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

    Char combustion; CO/CO2 ratio; Surface products; Reaction path; TG-DSC;

    机译：炭燃烧;CO / CO2比;表面产物;反应路径;TG-DSC;

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