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Release and transformation of alkali metals during co-combustion of coal and sulfur-rich wheat straw

机译：煤和富硫小麦秸秆共燃烧过程中碱金属的释放和转化

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摘要

Co-combustion of coal and biomass is a low-cost, large-scale, and efficient way to utilize biomass energy, which has a wide range of potential applications. However, biomass, especially herbaceous fuels, contains high levels of volatile K, Na, and Cl, the use of which may result in ash-related operational problems, such as corrosion, fouling, and slagging during thermal utilization. The aim of this study is to investigate the effects of wheat straw and temperature on the release and transformation of alkali metal species during co-combustion of coal and S-rich wheat straw. Results indicate that the amounts of K and Na released during co-combustion could be reduced by the effects of Fe, Ti, S, Si, and Al from blended fuels. At lower wheat straw shares, the release of K decreased due to reactions of KCl with Fe species, and Ti species, forming K_2Fe_2O_4 and K_2TiO_3. At high wheat straw shares, the release of K could be mainly captured in the form of K_2SO_4; small amounts of KAlSiO_4 were also observed in the bottom ash. When the wheat straw share was 80wt.%, increasing temperatures enhanced the release of KCl(g) and NaCl(g) at 600-800 ℃. By contrast, in the range of 800-1000 ℃, the amounts of these gases released exhibited no apparent association with temperature. Compared with the release of K, fuel K was mainly retained in the bottom ash. The K_2SO_4 content in the bottom ash decreased with increasing temperature in the range of 600-1000 ℃, whereas the fraction of K in the form of KAlSiO_4 and KAlSiO_6 increased with increasing temperature, especially at temperatures between 800 and 1000 ℃.
机译：煤与生物质的共燃是利用生物质能源的一种低成本，大规模且有效的方式，具有广泛的潜在应用。然而，生物质，特别是草本燃料，含有高含量的挥发性钾，钠和氯，其使用可能导致与灰分有关的运行问题，例如在热利用过程中腐蚀，结垢和结渣。本研究的目的是研究麦秸和富硫麦秸共燃烧过程中麦秸和温度对碱金属物质释放和转化的影响。结果表明，混合燃料中的Fe，Ti，S，Si和Al的影响可减少共燃烧过程中释放的K和Na量。在较低的小麦秸秆份额下，由于KCl与Fe和Ti的反应，钾的释放减少，形成K_2Fe_2O_4和K_2TiO_3。在小麦秸秆占有率高的情况下，钾的释放主要以K_2SO_4的形式捕获。在底灰中也观察到少量的KAlSiO_4。当小麦秸秆含量为80wt。％时，升高温度提高了600-800℃下KCl（g）和NaCl（g）的释放。相反，在800-1000℃范围内，这些气体的释放量与温度没有明显的联系。与释放钾相比，燃料钾主要保留在底灰中。在600-1000℃范围内，底灰中K_2SO_4的含量随温度的升高而降低，而KAlSiO_4和KAlSiO_6形式的K的含量随温度的升高而增加，特别是在800〜1000℃的温度下。

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  • 来源
    《Energy Conversion & Management》 |2014年第7期|197-202|共6页
  • 作者

    Rundong Li; Xingping Kai; Tianhua Yang; Yang Sun; Yeguang He; Shengqiang Shen;

  • 作者单位

    Liaoning Key Laboratory of Clean Energy and School of Energy and Environment, Shenyang Aerospace University, No. 37 Daoyi South Avenue, Daoyi Development District, Shenyang 110136, Liaoning, China;

    Liaoning Key Laboratory of Clean Energy and School of Energy and Environment, Shenyang Aerospace University, No. 37 Daoyi South Avenue, Daoyi Development District, Shenyang 110136, Liaoning, China,Key Laboratory for Sea Water Desalination of Liaoning Province, Dalian University of Technology, No. 2 Linggong Road, Canjingzi District, Dalian 116024, Liaoning, China;

    Liaoning Key Laboratory of Clean Energy and School of Energy and Environment, Shenyang Aerospace University, No. 37 Daoyi South Avenue, Daoyi Development District, Shenyang 110136, Liaoning, China;

    Liaoning Key Laboratory of Clean Energy and School of Energy and Environment, Shenyang Aerospace University, No. 37 Daoyi South Avenue, Daoyi Development District, Shenyang 110136, Liaoning, China;

    Liaoning Key Laboratory of Clean Energy and School of Energy and Environment, Shenyang Aerospace University, No. 37 Daoyi South Avenue, Daoyi Development District, Shenyang 110136, Liaoning, China;

    Key Laboratory for Sea Water Desalination of Liaoning Province, Dalian University of Technology, No. 2 Linggong Road, Canjingzi District, Dalian 116024, Liaoning, China;

  • 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

    Biomass; Coal; Transformation; Co-combustion; Alkali metals;

    机译：生物质煤;转型;共燃;碱金属;

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