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Experimental investigation on the ignition and combustion characteristics of pyrolyzed char and bituminous coal blends

机译：热解焦炭和沥青煤的点火和燃烧特性的实验研究

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摘要

This work studies the ignition behavior and combustion characteristics of pulverized pyrolyzed bituminous (PB) char blended with pulverized bituminous coal at different mass fractions. Experimental studies were conducted with OH planar laser-induced fluorescence (OH-PLIF) diagnosis technology in a flat-flame optical entrained flow reactor for pulverized coal/char. An interaction occurs between pyrolyzed char and bituminous coal, which is indicated by the relationship observed between the pyrolyzed char mass fraction mean values (MFMVs) and the combustion properties of the blended fuels. The addition of bituminous coal enhances the competitive effects of the two fuels on ignition and burnout. The synergistic effect observed upon ignition of the blends is mainly attributed to the high volatile contents and the potential catalysis effects from the alkali and alkaline earth metal species in the blends. The important factor leading to this synergistic effect is that the alkali and alkaline earth metal species in the ash can reduce the ignition temperature and accelerate the release of volatiles, thereby shortening the ignition delay. The high flame temperature and the potential catalysis effects from the alkali metal and transition metal species promote blended fuel burnout. Considering both the ignition delay and the residual char burnout, the optimal blending ratio of pyrolyzed char is approximately 20% because the fixed carbon burnout of the blends is considerably promoted and the ignition delay is significantly shortened. In comparison with PB char, the ignition delay decreased by 28.95% and the burnout ratio increased by 39% at the 20% PB char blending ratio.
机译：该工作研究了在不同质量级分的粉碎热解沥青（Pb）炭的点火行为和燃烧特性与粉碎的沥青煤混合。用OH平面激光诱导的荧光（OH-PLIF）诊断技术进行实验研究，用于粉碎煤/炭的扁平火焰光学夹带的流量反应器中。在热解的炭和烟煤之间发生相互作用，这是通过在热解的焦油质量分数（MFMV）之间观察到的关系和混纺燃料的燃烧性能之间的关系表示。添加沥青煤可以增强两种燃料对点火和倦怠的竞争效果。在喷射共混物时观察到的协同效应主要归因于共混物中碱和碱土金属物种的高挥发性含量和潜在的催化作用。导致这种协同效应的重要因素是灰分中的碱和碱土金属物种可以降低点火温度并加速挥发物的释放，从而缩短点火延迟。高火焰温度和碱金属和过渡金属物种的潜在催化作用促进了混合燃料燃烧。考虑到点火延迟和残留的炭燃烧，热解焦炭的最佳共混比例约为20％，因为混合物的固定碳燃烧显着升高，点火延迟显着缩短。与Pb炭相比，点火延迟减少了28.95％，燃烧率在20％Pb炭混合比下增加了39％。

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  • 来源
    《Fuel》 |2020年第1期|118732.1-118732.11|共11页
  • 作者

    Qi Hongliang; Sun Rui; Peng Jiangbo; Meng Xiaoxiao; Cao Zhen; Wang Zhuozhi; Ren Xiaohan; Yuan Mengfan; Zhang Lei; Ding Saijie;

  • 作者单位

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Natl Key Lab Sci & Technol Tunable Laser Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Natl Key Lab Sci & Technol Tunable Laser Harbin 150001 Peoples R China;

    Hebei Univ Technol Sch Energy & Environm Engn Tianjin 300401 Peoples R China|Hebei Univ Technol Tianjin Key Lab Clean Energy & Pollut Control Tianjin 300401 Peoples R China;

    Shandong Univ Inst Thermal Sci & Technol Jinan 250061 Peoples R China;

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China;

    CRCC Qingdao Vehicle Inspect Stn Co Ltd Qingdao 266031 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

    Pyrolyzed bituminous char; Ignition; Burnout; OH-PLIF; Co-combustion;

    机译：热解的沥青炭;点火;倦怠;OH-PLIF;共燃烧;

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