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The continuous combustion of glycerol in a fluidised bed

机译：流化床中甘油的连续燃烧

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摘要

It is difficult to burn a liquid fuel inside a fluidised bed. For the first time, liquid glycerol has been burned, when continuously injected into the bottom of an electrically heated bed of alumina particles (sieved to 355-425 mu m), fluidised by air. The temperature in the bed was held at 700, 800 or 900 degrees C; usually (U/U-mf) was 2.5. The bed's depth was varied, as also were (U/U-mf) and the ratio of fuel to air supplied to the bed. Measurements were made of the concentrations of CH4, O-2, CO and CO2, and also of the temperature, in the freeboard well above the bed. On entering the bed, the liquid glycerol rapidly formed bubbles of vapour, which quickly decomposed thermally, yielding mostly CO and H-2. These gases then mixed with the other gases in the bed. It appears that the diffusive H-2 mainly burns between the fluidised particles. With the bed at 700-900 degrees C, no CO was detected far downstream of the bed, provided the equivalence ratio, theta, was below 0.7, i.e., with more than 43% excess air. Under these fuel-lean conditions, all the carbon in the glycerol was oxidised to CO2. However, in a more fuel-rich situation, with theta 0.7 CO was detected well above the bed, particularly with a deeper bed, at a lower temperature and operating more fuel-rich. Thus, with the bed at 900 degrees C, CO was mostly oxidised inside the bed, but occasionally some CO burned on top of the bed. When a fuel-rich bed was below approximate to 850 degrees C, not all the CO burned in the bed. Achieving complete combustion inside a fluidised bed is partly a problem of mixing the products of glycerol's thermal decomposition with the fluidising air, which on entry exists mainly in bubbles. Consequently, increasing (U/U-mf) promoted both mixing and combustion in a bed. In addition, in-bed combustion requires the bed to be sufficiently deep, hotter than approximate to 850 degrees C and theta to be less than a critical value. The effects of other variables are discussed. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：在流化床内很难燃烧液体燃料。液态甘油首次连续燃烧到氧化铝颗粒（筛分为355-425μm）的电加热床底部时被燃烧，并通过空气流化。床中的温度保持在700、800或900℃。通常（U / U-mf）为2.5。床的深度以及（U / U-mf）和供应给床的燃料与空气的比率也不同。在床上方的干舷中测量了CH4，O-2，CO和CO2的浓度以及温度。进入床层后，液态甘油迅速形成蒸气气泡，蒸气迅速热分解，主要产生CO和H-2。然后这些气体与床中的其他气体混合。似乎扩散的H-2主要在流化颗粒之间燃烧。在床处于700-900摄氏度的条件下，如果当量比theta低于0.7，即过量空气超过43％，则在床的下游没有检测到CO。在这些贫燃料条件下，甘油中的所有碳都被氧化为CO2。但是，在更富燃料的情况下，在床层上方，尤其是更深的床层，在较低的温度下和运行的更富燃料的情况下，在床层上方，尤其是在更深的床层中，检测到θ> 0.7的CO尤其如此。因此，当床处于900摄氏度时，CO在床内大部分被氧化，但偶尔有一些CO在床顶燃烧。当富含燃料的床低于约850摄氏度时，并不是所有的CO都在床中燃烧。在流化床内实现完全燃烧部分是将甘油的热分解产物与流化空气混合的问题，流化空气在进入时主要存在于气泡中。因此，增加（U / U-mf）促进了床内混合和燃烧。另外，床内燃烧要求床足够深，比约850℃高的温度和θ小于临界值。讨论了其他变量的影响。 （C）2018年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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  • 来源
    《Combustion and Flame》 |2019年第2期|60-68|共9页
  • 作者

    Gibson Ian; Slim Chris J.; Zheng Yaoyao; Scott Stuart A.; Davidson John F.; Hayhurst Allan N.;

  • 作者单位

    Univ Cambridge, Dept Chem Engn & Biotechnol, Philippa Fawcett Dr, Cambridge CB3 0AS, England;

    Univ Cambridge, Dept Chem Engn & Biotechnol, Philippa Fawcett Dr, Cambridge CB3 0AS, England;

    Univ Cambridge, Dept Engn, Trumpington St, Cambridge CB2 1PZ, England;

    Univ Cambridge, Dept Engn, Trumpington St, Cambridge CB2 1PZ, England;

    Univ Cambridge, Dept Chem Engn & Biotechnol, Philippa Fawcett Dr, Cambridge CB3 0AS, England;

    Univ Cambridge, Dept Chem Engn & Biotechnol, Philippa Fawcett Dr, Cambridge CB3 0AS, England;

  • 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

    Fluidised bed combustion; Combustion of liquids; Combustion of glycerol; Mixing in fluidised beds;

    机译：流化床燃烧;液体燃烧;甘油燃烧;流化床混合;

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