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首页> 外文期刊>Energy & fuels >Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion
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Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion

机译：多孔壁空气与空气分级对煤粉燃烧过程中NOx排放的影响

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摘要

Air-staged combustion is one of the most sophisticated and effective technologies for reducing NOx emission during pulverized coal combustion. However, it may also result in problems of high-temperature corrosion, slagging, and high-imperfect/incomplete combustion loss. In order to prevent these problems, the multihole wall air coupling with air-staged technology (MH&AS) has been developed. The aim of this work is to investigate the impact of MH&AS on NOx emission by applying a laboratory scale of a MH&AS furnace. The results show that there existed an optimal multihole wall air ratio to significantly reduce the NOx emission. For example, with burner air ratios of 0.6, 0.7, 0.8, and 0.9, the corresponding optimal multihole wall air ratios were 0.100, 0.075, 0.050 and 0.025, respectively. The air distribution mode with a smaller burner air ratio and its optimal multihole wall air ratio were more conducive for NOx reduction. Furthermore, the influence of coal properties on NOx emission was also evaluated. The higher the fuel ratio, the larger the optimal multihole wall air ratio, whereas the finer the pulverized coal, the smaller the optimized multihole wall air ratio. There was a critical moisture content for the specified coal to obtain the minimum of NOx emission. In addition, the effect of MH&AS on the burnout was also explored. The optimal multihole wall air ratio could simultaneously make a minimum amount of NOx emission and the ultimate value of burnout. Finally, the mechanism of NOx reduction by char during MH&AS combustion was proposed.
机译：分级燃烧是减少煤粉燃烧过程中NOx排放的最先进，最有效的技术之一。但是，它也可能导致高温腐蚀，结渣和高不完全/不完全燃烧损失的问题。为了防止这些问题，已经开发了具有空气分级技术（MH＆AS）的多孔壁空气耦合器。这项工作的目的是通过使用MH＆AS炉的实验室规模来研究MH＆AS对NOx排放的影响。结果表明，存在最佳的多孔壁空气比，可以显着减少NOx的排放。例如，在燃烧器空气比为0.6、0.7、0.8和0.9的情况下，相应的最佳多孔壁空气比分别为0.100、0.075、0.050和0.025。燃烧器空气比较小的空气分配模式及其最佳的多孔壁空气比更有利于NOx的还原。此外，还评估了煤性质对NOx排放的影响。燃料比越高，最佳多孔壁空气比就越大，而煤粉越细，最佳多孔壁空气比就越小。对于指定的煤来说，要达到最低的NOx排放量，必须达到临界水分含量。此外，还探讨了MH＆AS对倦怠的影响。最佳的多孔壁空气比可以同时产生最少的NOx排放量和燃尽极限值。最后提出了MH＆AS燃烧过程中焦炭还原NOx的机理。

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  • 来源
    《Energy & fuels》 |2018年第2期|1464-1473|共10页
  • 作者

    Ma Honghe; Zhou Lu; Ma Suxia; Wang Zhijian; Du Huijuan; Li Jun; Zhang Wei; Guo Pengpeng; Chew Jia Wei;

  • 作者单位

    Taiyuan Univ Technol, Dept Thermal Engn, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Dept Thermal Engn, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Dept Thermal Engn, Taiyuan 030024, Shanxi, Peoples R China;

    Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Dept Thermal Engn, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Dept Thermal Engn, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Dept Thermal Engn, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Technol, Dept Thermal Engn, Taiyuan 030024, Shanxi, Peoples R China;

    Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637459, Singapore;

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