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首页> 外文期刊>Combustion and Flame >Multimodal ultrafine particles from pulverized coal combustion in a laboratory scale reactor
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Multimodal ultrafine particles from pulverized coal combustion in a laboratory scale reactor

机译：实验室规模反应器中煤粉燃烧产生的多峰超细颗粒

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摘要

Particle size distribution functions have been measured in a ethanol fueled flame reactor fed with a low amount of pulverized coal particles. The reactor is operated in low (5.0 vol.%) and high (76.5 vol.%) oxygen concentrations using two high volatile bituminous Colombian and Indonesian coals. A carbon black powder is also oxidized in the same conditions. Generated particles are sampled using rapid-dilution probes and the size distribution functions are measured on-line by a high resolution Differential Mobility Analyzer. Results clearly show that ultrafine particles, those with sizes lower than 100 nm, have a multimodal size distribution function. These particles have huge number concentrations in both investigated conditions whereas their formation is enhanced in the oxygen enriched condition. Ultrafine particles are almost totally dominated in number by the fraction having sizes below 30 nm. Nanoparticles also account for a significant fraction of total particle mass and slowly coagulate in the reactor. The shape of the size distribution functions is not affected by the coal type, at least for the two investigated coals. Results suggest that ultrafine particles form through the vaporization-nucleation-growth pathway involving inorganic ashes. Moreover the contribution of carbonaceous particles seems particularly important for size smaller than 5 nm.
机译：粒度分布函数已在装有少量煤粉的乙醇燃料火焰反应器中进行了测量。反应器使用两种高挥发性的哥伦比亚和印尼烟煤在低（5.0％体积）和高（76.5％体积）的氧气浓度下运行。炭黑粉末也在相同条件下被氧化。使用快速稀释探针对生成的颗粒进行采样，并通过高分辨率的差动迁移率分析仪在线测量尺寸分布函数。结果清楚地表明，尺寸小于100 nm的超细颗粒具有多峰尺寸分布功能。这些颗粒在两种研究条件下均具有大量浓度，而在富氧条件下它们的形成得到增强。在数量上，超细颗粒几乎完全由尺寸小于30 nm的部分所控制。纳米颗粒还占总颗粒质量的很大一部分，并在反应器中缓慢凝结。尺寸分布函数的形状不受煤炭类型的影响，至少对于两种研究的煤炭而言。结果表明，超细颗粒是通过涉及无机灰分的汽化成核生长途径形成的。而且，对于小于5nm的尺寸，碳质颗粒的贡献似乎特别重要。

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  • 来源
    《Combustion and Flame》 |2010年第7期|P.1290-1297|共8页
  • 作者

    Francesco Carbone; Federico Beretta; Andrea DAnna;

  • 作者单位

    Istituto di Ricerche sulla Combustione, Consiglio Nazionale delle Ricerche, piazzale Vincenzo Tecchio 80, 80125 Napoli, Italy;

    rnIstituto di Ricerche sulla Combustione, Consiglio Nazionale delle Ricerche, piazzale Vincenzo Tecchio 80, 80125 Napoli, Italy;

    rnDipartimento di Ingegneria Chimica, Universita degli Studi di Napoli Federico II, piazzale Vincenzo Tecchio 80, 80125 Napoli, Italy;

  • 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
  • 中图分类
  • 关键词

    coal; fly-ashes; ultrafine particles; particle size distribution functions; oxy-combustion;

    机译：煤;粉煤灰;超细颗粒;粒度分布函数;氧燃烧;

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