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Air-Staged Combustion Characteristics of Pulverized Coal under High Temperature and Strong Reducing Atmosphere Conditions

机译：高温强还原气氛下煤粉的空段燃烧特性

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摘要

It is of great importance to clarify the effect of the combustion temperature in actual boilers on air-staging combustion of coals. In this work, a novel vertical tandem-type drop-tube furnace system was set up, in which a temperature of as high as 1600 ℃ can be achieved. Experimental investigations were performed thoroughly with particular attention to NO_x formation and unburned carbon in ash. The results indicate that, to maximize NO_x removal efficiency by air-staged combustion, the reducing zone should be under high temperature and strong reducing atmosphere (HT&SRA) conditions. A remarkably low NO_x emission and high coal burnout can be attained concurrently by creating HT&SRA conditions in the fuel-rich zone. The NO_x emission for high-volatile coals can be below 150 mg/m~3. The special role of the temperature is discussed in detail in terms of the difference of NO_x formation between the reducing zone exit and burnout zone exit For comparison, the NO_x emission in Ar/O_2- and oxy-fuel-staged combustion was also studied. Staged combustion is as effective for NO-x reduction in Ar/O_2 and oxy-fuel as in air combustion. However, for oxy-fuel-staged combustion, the effect of HT&SRA conditions presents some differences, which are closely related with the oxygen proportion in the gas atmosphere. In addition, it is also found that the temperature in the burnout zone (800-1200 ℃) has a weak effect on NO_x generation, but CO emission would drastically increase when it is below 1100 ℃.
机译：弄清实际锅炉中燃烧温度对煤的空气分级燃烧的影响非常重要。在这项工作中，建立了一种新型的垂直串联式落管炉系统，可以达到高达1600℃的温度。进行了彻底的实验研究，特别注意了NO_x的形成和灰中未燃烧的碳。结果表明，为了最大程度地通过空气阶段燃烧去除NO_x，还原区应处于高温和强还原气氛（HT＆SRA）条件下。通过在富油区创造HT＆SRA条件，可以同时达到极低的NO_x排放量和高燃煤率。高挥发分煤的NO_x排放可以低于150 mg / m〜3。根据还原区出口和燃尽区出口之间NO_x形成的差异，详细讨论了温度的特殊作用。为了进行比较，还研究了Ar / O_2-和含氧燃料分级燃烧中的NO_x排放。分级燃烧对于减少Ar / O_2和含氧燃料中的NOx效果与空气燃烧一样有效。但是，对于含氧燃料的分级燃烧，HT＆SRA条件的影响存在一些差异，这些差异与气体气氛中的氧气比例密切相关。此外，还发现燃尽区的温度（800-1200℃）对NO_x产生的影响较弱，但当温度低于1100℃时，CO排放会急剧增加。

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  • 来源
    《Energy & fuels》 |2014年第maraaapra期|1820-1828|共9页
  • 作者

    Wengang Bai; Hao Li; Lei Deng; Hu Liu; Defu Che;

  • 作者单位

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China;

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China;

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China;

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China;

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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