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A novel method for precise measurement of unburnt carbon in boiler fly ash by ECSA® based on TG-MS

机译：基于TG-MS的ECSA®精确测量锅炉飞灰中未燃烧碳的新方法

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摘要

The unburnt carbon content of fly ash is an important index for evaluating the combustion efficiency of boilers. Measurement by traditional loss-on-ignition (LOI), approximate and elemental analyses causes large errors due to mixing minerals such as portlandites, carbonates, or sulfates with the unburnt carbon. In this paper a new method of Equivalent Characteristic Spectrum Analysis (ECSA (R)) based on Thermogravimetric Mass Spectrometry (TG-MS) was adopted to determine the unburnt carbon in fly ash. The measuring mechanism, accuracy, superiority, sensitivity, and reliability of ECSA (R) were discussed. The intrinsic measuring mechanism of ECSA (R) and its sensitivity were explored through analyzing the reaction characteristics of model compounds that were used to simulate the real fly ash. Five types of real fly ashes collected from boiler plants were used to calibrate and verify the reliability and accuracy of ECSA (R) method. The ECSA (R) was finally validated to be more precise and accurate by improving 2 to 3 orders of magnitude in error compared with the LOI and elemental analysis on determining the unburnt carbon in fly ash, and can provide reliable information to assess the operating status of boilers.
机译：粉煤灰的未燃烧碳含量是评估锅炉燃烧效率的重要指标。由于将矿物（例如波特兰石，碳酸盐或硫酸盐）与未燃烧的碳混合，通过传统的燃烧失重（LOI），近似和元素分析进行​​的测量会导致较大的误差。本文采用了一种基于热重质谱（TG-MS）的等效特征谱分析（ECSA（R））的新方法来测定飞灰中的未燃烧碳。讨论了ECSA（R）的测量机理，准确性，优越性，灵敏性和可靠性。通过分析用于模拟真实粉煤灰的模型化合物的反应特性，探索了ECSA（R）的内在测量机理及其敏感性。从锅炉厂收集的五种真实飞灰用于校准和验证ECSA（R）方法的可靠性和准确性。最终，通过与LOI和元素分析（确定粉煤灰中未燃烧的碳）相比，将ECSA（R）的误差提高了2至3个数量级，从而验证了ECSA（R）的准确性和准确性，并且可以提供可靠的信息来评估运行状态锅炉。

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  • 来源
    《Fuel》 |2020年第15期|116849.1-116849.8|共8页
  • 作者

    Li Rongbin; Wei Kai; Huang Qian; Xia Hongde;

  • 作者单位

    Univ Sci & Technol Beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China;

    Chinese Acad Sci Inst Engn Thermophys Beijing 100190 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

    Unburnt carbon; Fly ash; Method; Model compound; TG-MS;

    机译：未燃烧的碳;粉煤灰;方法;模型化合物;热重质谱;

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