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Impact of sodium salts on agglomeration in a laboratory fluidized bed

机译：钠盐对实验室流化床中附聚的影响

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摘要

When using biomass as fuel for power and heat production, compounds in the biomass ash may cause problems for fluidized bed boilers, such as corrosion and agglomeration. Especially high alkali biomass has been shown to cause agglomeration that may lead to defluidization. Many laboratory scale studies have been done to clarify which compounds cause agglomeration and to identify actions to minimize the agglomeration tendency. However, most studies have used fuels or ashes; only a few studies using pure alkali salts can be found. To be able to study the agglomeration mechanisms in more detail, pure alkali salts were fed into a quartz bed as a function of time at different bed temperatures. Each test was terminated either at the point of defluidization or after a certain amount of salt had been fed. Samples of agglomerates and bed material were analyzed by SEM/EDX after the tests. The results showed that Na2CO3 reacted with the bed material to form sodium silicate, while NaCl, as well as Na2SO4, melted and glued the bed particles together. However, when water was added to the fluidization air, NaCl also reacted with the bed material, forming sodium silicate at temperatures above the melting point of NaCl. The amount of melt causing defluidization was calculated (based on analysis) to be around 0.10-0.13 wt% for the melting compounds. Furthermore, the amount of sodium silicate melt that was formed in the tests with Na2CO3 was calculated (based on fed Na2CO3) to be much higher (0.59-0.96 wt%) at defluidization.
机译：当使用生物质作为发电和供热的燃料时，生物质灰分中的化合物可能会给流化床锅炉带来问题，例如腐蚀和结块。尤其是高碱性的生物质已被证明会引起团聚，从而导致脱液。已经进行了许多实验室规模的研究，以弄清哪些化合物会导致团聚并确定将团聚趋势降至最低的措施。但是，大多数研究都使用了燃料或灰烬。只能发现使用纯碱金属盐的一些研究。为了能够更详细地研究团聚机理，在不同床温下，将纯碱金属盐作为时间的函数进料到石英床中。每次测试都在脱液点或加入一定量的盐后终止。试验后，通过SEM / EDX分析附聚物和床材料的样品。结果表明，Na2CO3与床层材料反应形成硅酸钠，而NaCl和Na2SO4熔化并粘合到床层颗粒上。但是，当将水添加到流化空气中时，NaCl也与床层材料发生反应，在高于NaCl熔点的温度下形成硅酸钠。对于熔融化合物，导致流化的熔融物的量（基于分析）经计算为约0.10-0.13wt％。此外，计算出在Na 2 CO 3的测试中形成的硅酸钠熔体的量（基于进料的Na 2 CO 3）在脱流体时要高得多（0.59-0.96wt％）。

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  • 来源
    《Fuel》 |2019年第1期|305-315|共11页
  • 作者

    Sevonius Christoffer; Yrjas Patrik; Lindberg Daniel; Hupa Leena;

  • 作者单位

    Abo Akad Univ, Inorgan Chem Lab, Johan Gadolin Proc Chem Ctr, Biskopsgatan 8, Abo Turku 20500, Finland;

    Abo Akad Univ, Inorgan Chem Lab, Johan Gadolin Proc Chem Ctr, Biskopsgatan 8, Abo Turku 20500, Finland;

    Abo Akad Univ, Inorgan Chem Lab, Johan Gadolin Proc Chem Ctr, Biskopsgatan 8, Abo Turku 20500, Finland;

    Abo Akad Univ, Inorgan Chem Lab, Johan Gadolin Proc Chem Ctr, Biskopsgatan 8, Abo Turku 20500, Finland;

  • 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

    Fluidized bed; Agglomeration; Defluidization; Sodium; Laboratory scale;

    机译：流化床附聚脱液钠实验室规模;

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