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Factors affecting coal particle ignition under oxyfuel combustion atmospheres

机译：富氧燃烧气氛下影响煤粉着火的因素

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摘要

A set of 13 coals of different rank has been tested for ignition propensity in a 20-L explosion chamber simulating oxyfuel combustion gas conditions. Their char residues were also analysed thermogravimet-rically. The effects of coal type, coal concentration (from 100 to 600 g/m~3), O_2 in CO_2 atmospheres (up to 40% v/v) and particle size were investigated. The higher rank coals were significantly more difficult to ignite and mostly required higher energy chemical igniters (1000 or 2500 J) whereas the lower rank coals could be ignited with a 500 J igniter even at low coal dust concentrations. The minimum explosibility limit/ignition concentration in air varied slightly around a value of 200 g/m~3, a little higher for low volatile coals and a little lower for high volatile coals. The ignition limit changed significantly, however, with O_2 concentration in CO_2, where coals required more oxygen to ignite. Most coals failed to ignite at all in 21% v/v O_2 in CO_2, but an increase to 30 or 35% v/v O_2 gave ignition patterns similar to those in air. In addition, the minimum ignition concentration decreased with increase in O_2. However, a further increase to 40% v/v O_2 did not generally affect the minimum ignition concentration. Particle size had a non-linear effect on coal ignition. The fine particles (<53 μm) behaved almost identical to the whole coal. However, the larger size fraction (>53 μm) was generally more difficult to ignite and exhibited a much lower weight loss.
机译：在模拟氧气燃料燃烧气体条件的20升爆炸室内，测试了13种不同等级的煤的着火倾向。还通过热重分析了它们的炭残留物。研究了煤种，煤浓度（100〜600 g / m〜3），CO_2气氛中O_2（v / v高达40％）和粒径的影响。较高等级的煤极难点燃，并且大多需要较高能量的化学点火器（1000或2500 J），而即使在较低的煤尘浓度下，较低等级的煤也可用500 J的点火器点燃。空气中的最小爆炸极限/着火浓度在200 g / m〜3的范围内略有变化，对于低挥发分煤则略高，而对于高挥发分煤则略低。但是，点火极限随CO_2中O_2浓度的变化而显着变化，在此情况下，煤需要更多的氧气才能点火。大多数煤在CO_2中的21％v / v O_2根本无法点燃，但是增加到30％或35％v / v O_2时，点火方式与空气中相似。另外，最小点火浓度随O_2的增加而降低。但是，进一步增加到40％v / v O_2通常不会影响最小点火浓度。粒度对燃煤有非线性影响。细颗粒（<53μm）的行为几乎与整个煤相同。但是，较大的尺寸分数（> 53μm）通常更难点燃，并且重量损失要低得多。

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  • 来源
    《Fuel》 |2011年第1期|p.294-304|共11页
  • 作者

    C.K. Man; J.R. Gibbins;

  • 作者单位

    Department of Mechanical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK,Pittsburgh Research Laboratory,National Institute for Occupational Safety and Health, PO Box 18070, Pittsburgh,PA 15236, USA;

    Department of Mechanical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK;

  • 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

    oxyfuel combustion; coal ignition; CO_2; carbon capture; deflagration;

    机译：氧燃料燃烧;燃煤;CO_2;碳捕获爆燃;

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