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首页> 外文期刊>Fuel >Magnetic separation of ilmenite used as oxygen carrier during combustion of biomass and the effect of ash layer buildup on its activity and mechanical strength
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Magnetic separation of ilmenite used as oxygen carrier during combustion of biomass and the effect of ash layer buildup on its activity and mechanical strength

机译：在生物质燃烧过程中用作氧载体的磁性分离及灰层堆积对其活性和机械强度的影响

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摘要

Utilization of oxygen carriers in existing circulating fluidized bed (CFB) units is referred to as oxygen carrier aided combustion (OCAC) and is employed to achieve enhanced combustion of heterogeneous fuels, such as biomass and waste. Although oxygen carriers have successfully been implemented to industrial settings, the materials are more expensive than conventional alternatives. The oxygen carrier ilmenite has shown to be magnetically separable from the residual ash stream providing a potential to reuse the material and mitigate cost. For this purpose, it is imperative to understand how properties of the material such as its oxygen carrying capacity and mechanical strength are developed with increased residence time in the system.In this study, rock ilmenite was evaluated after being used during OCAC in two separate industrial facilities. In Chalmers semi-industrial (12 MWth) CFB boiler, a set of samples were extracted on daily basis. These provide insight to how the material changes over time. In the utility company Kraftringen's 115 MWth CFB boiler, one sample was retrieved and divided by a magnetic separator. To evaluate the oxygen transferring capacity, the materials were tested in a batch reactor with syngas as fuel.The present study shows that ash layers are not necessarily inhibitory to the oxygen transferring capacity, but long-term operation with thick layer buildup as a result causes reduction of the materials oxygen transferring capacity. Ash layer formation can instead improve mechanical strength of bed particles. Optimization measures are suggested where activated material is separated by magnet and reused in the system.
机译：在现有的循环流化床（CFB）单元中的利用用氧载体被称为氧载体辅助燃烧（OCAC），并且用于实现异质燃料的增强燃烧，例如生物质和废物。虽然氧气载体已经成功地实施到工业环境中，但材料比传统替代品更昂贵。氧载体钛铁矿已经显示出可从残留的灰分流磁性可分离，提供重复使用材料和减轻成本的潜力。为此目的，必须了解诸如其氧气承载能力和机械强度的材料的性质是如何在系统中增加的停留时间开发的。在本研究中，在两个单独的工业中使用岩石ilmenite后评估了岩石ilmenite设施。在Chalmers半工业（12 MWTH）CFB锅炉中，每天提取一组样品。这些提供了对材料如何随时间变化的洞察力。在公用事业公司Kraftringen的115 MWTH CFB锅炉中，通过磁性分离器检索一个样品并除以磁性分离器。为了评估氧气转移能力，将材料用与燃料合成气的分批反应器测试。本研究表明，灰分层不一定抑制氧传输能力，但由于厚度的厚度累积而长期运行减少材料氧气转移能力。灰层形成可以改善床颗粒的机械强度。建议优化措施，其中活性材料通过磁铁分离并在系统中重复使用。

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  • 来源
    《Fuel》 |2020年第1期|117470.1-117470.10|共10页
  • 作者

    Gyllen Angelica; Knutsson Pavleta; Lind Fredrik; Thunman Henrik;

  • 作者单位

    Chalmers Univ Technol Dept Space Earth & Environm SE-41296 Gothenburg Sweden;

    Chalmers Univ Technol Dept Chem & Chem Engn SE-41296 Gothenburg Sweden;

    Chalmers Univ Technol Dept Space Earth & Environm SE-41296 Gothenburg Sweden;

    Chalmers Univ Technol Dept Space Earth & Environm SE-41296 Gothenburg Sweden;

  • 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

    Ilmenite; Oxygen carrier aided combustion; Combustion; Biomass; Biomass ash;

    机译：ilmenite;氧载体辅助燃烧;燃烧;生物量;生物量灰;

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