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首页> 外文期刊>Energy & fuels >Influence of Phosphorus on Alkali Distribution during Combustion of Logging Residues and Wheat Straw in a Bench-Scale Fluidized Bed
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Influence of Phosphorus on Alkali Distribution during Combustion of Logging Residues and Wheat Straw in a Bench-Scale Fluidized Bed

机译：台式流化床中磷对测井残渣和麦秸燃烧过程中碱分布的影响

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摘要

The influence of phosphorus on the alkali distribution in fluidized (quartz) bed combustion using two different typical biomasses (logging residues and wheat straw) was studied Phosphoric acid (H_3PO_4) was used as an additive. The produced ash fractions were analyzed for morphology and elemental composition by scanning electron microscopy-energy-dispersive spectroscopy (SEM-EDS), and crystalline phases by powder X-ray diffraction (P-XRD). For both fuel assortments tested, a reduction of volatilized deposit and fine particle-forming matter, containing mainly KC1, was achieved by adding phosphorus. For the wheat straw, this effect was considerable at medium and high phosphorus addition. As a consequence, an increased amount of potassium was found in the coarse ash particle fractions, principally as CaKPO_4 KMgPO_4, and CaK_2P_2O_7, at the same time that the levels of HC1 and SO_2 in the flue gases increased. Generally, the addition of phosphorus to the studied biomasses changed the alkali distribution from being dominated by amorphous K-silicate coarse ash fractions and fine particulate KC1, to a system dominated by crystalline coarse ash of K-Ca/Mg-phosphates and fine particulate K_2SO_4. This implies that the fouling and high-temperature corrosion observed in industrial-scale combustion of problematic biofuels can possibly be reduced by employing additives rich in reactive phosphorus, on the condition that the higher concentrations of acidic gases can be tolerated. In order to achieve these effects, the relationship between alkali and alkaline-earth metals (i.e., (K + Na)/(Ca + Mg)) in the overall fuel ash must be considered. With respect to this, the formation of low-temperature-melting alkali-rich phosphates should not be promoted, to avoid potential increases in bed agglomeration tendencies and phosphorus release from the bed.
机译：研究了磷对两种不同典型生物质（测井残留物和麦秸）流化床（石英）燃烧中碱分布的影响。使用了磷酸（H_3PO_4）作为添加剂。通过扫描电子显微镜-能量分散光谱法（SEM-EDS）分析生成的灰分的形态和元素组成，并通过粉末X射线衍射（P-XRD）分析结晶相。对于所测试的两种燃料，通过添加磷均能减少挥发的沉积物和主要包含KCl的细颗粒形成物。对于小麦秸秆，在中等和较高的磷添加量下，这种效果相当明显。结果，在烟灰粗粒级分中发现的钾含量增加，主要是CaKPO_4 KMgPO_4和CaK_2P_2O_7，同时烟道气中的HCl和SO_2含量增加。通常，向研究的生物质中添加磷将碱金属分布从以无定形K-硅酸盐粗灰分和细颗粒KC1为主，转变为以K-Ca / Mg-磷酸盐和细颗粒K_2SO_4的结晶粗灰为主的体系。 。这意味着在可以容忍较高浓度的酸性气体的条件下，通过使用富含活性磷的添加剂，可以减少工业化有问题的生物燃料燃烧中观察到的结垢和高温腐蚀。为了获得这些效果，必须考虑总燃料灰分中碱金属和碱土金属之间的关系（即（K + Na）/（Ca + Mg））。对此，不应促进低温熔融的富含碱金属的磷酸盐的形成，以避免床附聚趋势和磷从床中释放的潜在增加。

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  • 来源
    《Energy & fuels》 |2012年第mayajuna期|p.3012-3023|共12页
  • 作者

    Alejandro Grimm; Nils Skoglund; Dan Bostroem; Christoffer Boman; Marcus OEhman;

  • 作者单位

    Energy Engineering, Department of Engineering Sciences & Mathematics, Lulea University of Technology, SE- 971 87 Lulea, Sweden;

    Energy Technology and Thermal Process Chemistry, Umea University, SE-901 87 Umea, Sweden;

    Energy Technology and Thermal Process Chemistry, Umea University, SE-901 87 Umea, Sweden;

    Energy Technology and Thermal Process Chemistry, Umea University, SE-901 87 Umea, Sweden;

    Energy Engineering, Department of Engineering Sciences & Mathematics, Lulea University of Technology, SE- 971 87 Lulea, Sweden;

  • 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);
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