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首页> 外文期刊>Fuel >The mechanism of the formation of soot and other pollutants during the co-firing of coal and pine wood in a fixed bed combustor
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The mechanism of the formation of soot and other pollutants during the co-firing of coal and pine wood in a fixed bed combustor

机译：固定床燃烧器中煤与松木共烧过程中烟灰及其他污染物形成的机理

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摘要

The co-firing of coal and biomass reduces the emission of pollutants by a mechanism which has been extensively studied but is still uncertain. Emissions were collected during the combustion in a fixed-bed furnace of Polish bituminous coal and pine wood, both individually and together, and it was observed that biomass produced less soot and burned at a lower temperature. Complementary analytical-scale combustion and pyrolysis experiments were carried out. The results of the analysis of emissions and reaction products, mainly by gas chromatography-mass spectrometry (GC-MS), but for large molecules by size exclusion chromatography (SEC), were interpreted so as to construct a reaction scheme for pollutant formation during co-firing. Evidence for three main routes to pollutant formation during co-combustion was adduced. Firstly, the presence of high MW material (from SEC) indicates escape of devolatilisation products round the outside of the flame. Secondly, the emission factors (ef) of PAH, alkyl-PAH, oxygen-containing PAH (O-PAC) and phenols are consistent with partial pyrolysis, while the high concentrations of the two-ring (naphthalenes and indene) PAH precursors evidently arise through radical reactions involving cyclopentadiene intermediates from phenols generated by pyrolysis of both coal and of biomass lignin. Thirdly, the concentrations of larger PAH are consistent with contributions from a hydrogen abstraction carbon addition (HACA) mechanism in which acetylene or butadiene formed in the flame are added to smaller PAH radicals. A kinetic model was applied to coal, biomass and coal/biomass co-combustion and highlighted the role of HACA in soot production during biomass combustion, but this route to soot was insufficient to model the higher yields of soot observed during coal combustion. In this latter case radical reactions involving either cyclopentadiene or condensation reactions of smaller PAH molecules initially formed in the pyrolysis stage to give 'aromers' are more important.
机译：煤和生物质的共烧可以通过广泛研究的机制来减少污染物的排放，但仍不确定。在燃烧过程中，在波兰的烟煤和松木的固定床炉中收集了排放物，既单独排放也排放在一起，并且观察到生物质产生的烟灰更少，并且在较低的温度下燃烧。进行了补充分析规模的燃烧和热解实验。解释了排放物和反应产物的分析结果，主要是通过气相色谱-质谱（GC-MS），但对于大分子通过尺寸排阻色谱（SEC）进行了分析，从而构建了共存过程中污染物形成的反应方案。 -射击。提出了燃烧过程中形成污染物的三种主要途径的证据。首先，高分子量材料（来自SEC）的存在表明脱挥发分产物逃逸到了火焰的周围。其次，PAH，烷基PAH，含氧PAH（O-PAC）和苯酚的排放因子（ef）与部分热解一致，而明显出现了高浓度的二环（萘和茚）PAH前体通过自由基反应，涉及由煤和生物质木质素热解产生的酚类的环戊二烯中间体。第三，较大的PAH浓度与氢提取碳加成（HACA）机理的贡献一致，在该机理中，火焰中形成的乙炔或丁二烯被添加到较小的PAH自由基中。将动力学模型应用于煤，生物质和煤/生物质共燃烧，并强调了HACA在生物质燃烧过程中烟尘生产中的作用，但是这种通往烟尘的途径不足以模拟在煤燃烧过程中观察到的更高烟尘产量。在后一种情况下，更重要的是涉及环戊二烯的自由基反应或在热解阶段最初形成的较小的PAH分子的缩合反应，以生成“芳香族化合物”。

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  • 来源
    《Fuel》 |2009年第12期|2409-2417|共9页
  • 作者

    E.M. Fitzpatrick; K.D. Bartle; M.L Kubacki; J.M. Jones; M. Pourkashanian; A.B. Ross; A. Williams; K. Kubica;

  • 作者单位

    Energy and Resources Research institute, School of Process. Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;

    Energy and Resources Research institute, School of Process. Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;

    Energy and Resources Research institute, School of Process. Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;

    Energy and Resources Research institute, School of Process. Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;

    Energy and Resources Research institute, School of Process. Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;

    Energy and Resources Research institute, School of Process. Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;

    Energy and Resources Research institute, School of Process. Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;

    Institute of Thermal Technology, Silesian University of Technology, 44-101 Gliwice, Poland;

  • 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

    co-firing; coal; pine wood; emissions; PAH;

    机译：共烧煤;松木;排放多环芳烃;

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