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Combustion Characteristics and Ash Formation of Pulverized Coal under Pressurized Oxy-Fuel Conditions

机译：加压氧燃料条件下煤粉的燃烧特性及灰分形成

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摘要

The effects of pressure and oxygen concentration on the coal combustion characteristics and ash formation with mineral transformation in a pressurized O_2/CO_2 system were investigated. Thermogravimetric experiments indicated that the heterogeneous ignition at atmospheric pressure converted to homogeneous ignition at low and medium pressures, then began to change to heterogeneous ignition gradually at 4 MPa, and finally became heterogeneous ignition at 6 MPa. The increase of oxygen concentration did not affect the ignition mechanism of pulverized coal at 6 MPa, it only enhanced the intensity of combustion. The ignition and burnout temperatures did not change linearly with the increase in pressure, which led to a parabola trend of the combustibility index S. The scanning electron microscopy (SEM) micrographs suggested that more small ash particles were produced during combustion with the increase in pressure, which were possibly a result of the significant differences in char structure. X-ray dim-action (XRD) analysis of the ash samples showed that the pressure had an effect on the mineral phases formed in the residue ashes due to the impact of pressure on the combustion temperatures of different ignition mechanisms.
机译：研究了压力和氧​​气浓度对加压O_2 / CO_2系统中煤燃烧特性和矿物转化形成灰分的影响。热重实验表明，大气压下的异质点火在低压和中压下转变为均质点火，然后在4 MPa时逐渐变为异质点火，最后在6 MPa时变为异质点火。氧浓度的增加并没有影响6 MPa下煤粉的着火机理，只是增加了燃烧强度。点火和燃尽温度不随压力的增加而线性变化，这导致可燃指数S呈抛物线趋势。扫描电子显微镜（SEM）显微照片表明，随着压力的增加，燃烧过程中会产生更多的细小灰烬颗粒。 ，这可能是char结构存在明显差异的结果。粉煤灰样品的X射线暗行动（XRD）分析表明，由于压力对不同点火机理的燃烧温度的影响，压力对残留灰烬中形成的矿物相具有影响。

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  • 来源
    《Energy & fuels》 |2011年第sepaaocta期|p.4333-4344|共12页
  • 作者

    Chunbo Wang; Ming Lei; Weiping Yan; Songling Wang; Lufei Jia;

  • 作者单位

    School of Energy and Power Engineering, North China Electric Power University, Baoding City, Hebei Province, People's Republic of China;

    School of Energy and Power Engineering, North China Electric Power University, Baoding City, Hebei Province, People's Republic of China;

    School of Energy and Power Engineering, North China Electric Power University, Baoding City, Hebei Province, People's Republic of China;

    School of Energy and Power Engineering, North China Electric Power University, Baoding City, Hebei Province, People's Republic of China;

    School of Energy and Power Engineering, North China Electric Power University, Baoding City, Hebei Province, People's Republic of China,CanmetENERGY, 1 Haanel Drive, Ottawa, Ontario, Canada, K1A 1M1;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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