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Ash deposition during the co-firing of bituminous coal with pine sawdust and olive stones in a laboratory furnace

机译：烟煤与松木屑和橄榄石在实验室炉中共烧过程中的灰分沉积

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摘要

This article describes an experimental study on ash deposition during the co-firing of bituminous coal with pine sawdust and olive stones in a laboratory furnace. The main objective of this study was to relate the ash deposit rates with the type of biomass burned and its thermal percentage in the blend. The thermal percentage of biomass in the blend was varied between 10% and 50% for both sawdust and olive stones. For comparison purposes, tests have also been performed using only coal or only biomass. During the tests, deposits were collected with the aid of an air-cooled deposition probe placed far from the flame region, where the mean gas temperature was around 640 ℃. A number of deposit samples were subsequently analyzed on a scanning electron microscope equipped with an energy dispersive X-ray detector. Results indicate that blending sawdust with coal decreases the deposition rate as compared with the firing of unblended coal due to both the sawdust low ash content and its low alkalis content. The co-firing of coal and sawdust yields deposits with high levels of silicon and aluminium which indicates the presence of ashes with high fusion temperature and, thus, with less capacity to adhere to the surfaces. In contrast, in the co-firing of coal with olive stones the deposition rate increases as compared with the firing of unblended coal and the deposits produced present high levels of potassium, which tend to increase their stickiness.
机译：本文描述了在实验室炉中烟煤与松木锯末和橄榄石共烧过程中灰分沉积的实验研究。这项研究的主要目的是将灰分沉积速率与燃烧的生物质类型及其在掺混物中的热百分率联系起来。对于锯末和橄榄石，共混物中生物质的热百分比在10％和50％之间变化。为了比较，还仅使用煤或仅使用生物质进行了测试。在测试过程中，借助于空气冷却的沉积探针收集沉积物，该探针远离火焰区域，该区域的平均气体温度约为640℃。随后在配备有能量色散X射线检测器的扫描电子显微镜上分析了许多沉积物样品。结果表明，由于锯末灰分低，碱度低，与未掺混煤的燃烧相比，锯末与煤的混合降低了沉积速率。煤和木屑的共烧会产生含有高含量硅和铝的沉积物，这表明存在具有高熔融温度的灰烬，因此粘附在表面的能力较小。相反，与不掺混煤的燃烧相比，在煤与橄榄石的共烧中沉积速率增加，并且所产生的沉积物具有高含量的钾，这往往会增加其粘性。

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  • 来源
    《Fuel》 |2010年第12期|p.4040-4048|共9页
  • 作者

    P. Abreu; C. Casaca; M. Costa;

  • 作者单位

    Mechanical Engineering Department, Institute Superior Tecnico, Technical University of Lisbon, Lisbon, Portugal;

    rnInstitute Superior de Engenharia de Lisbon, Lisbon, Portugal;

    rnMechanical Engineering Department, Institute Superior Tecnico, Technical University of Lisbon, Lisbon, Portugal;

  • 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

    laboratory furnace; co-firing; sawdust; olive stones; deposition rate;

    机译：实验室炉;共烧锯末;橄榄石;沉积速率;

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