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Removal of elemental mercury in flue gas by Cu-Fe modified magnetosphere from coal combustion fly ash

机译：Cu-Fe改性磁层从煤燃烧粉煤灰去除烟气中的元素汞

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摘要

Magnetospheres (MF) obtained from fly ash by magnetic separation method has low mercury removal efficiency and weak magnetism in gas phase mercury removal. In this paper, magnetospheres were modified with Cu and Fe compounds by sol-gel method. The Hg-0 removal performance of Cu-Fe modified MF were investigated in a fixed bed reactor, and the effect of calcination temperature and flue gas composition on magnetism of the modified MF were examined. The Hg-0 removal efficiency of Cu(6)Fe-MF-400, which was obtained with 6 wt% Cu loading on MF, Cu:Fe atomic ratio being 1:2 and calcined at 400 degrees C, reaches 97% at 200 degrees C in the atmosphere of N-2, CO2 and O-2. Specific magnetic susceptibility of Cu(6)Fe-MF-400 enhances significantly from 41 to 52 cm(3)/g. The effect of flue gas composition on Hg-0 removal indicated that HCl significantly shortens the required time to achieve 80% efficiency of Hg-0 removal, while NO and SO2 prolong this required time. In the reaction temperature range of 100-350 degrees C, the required time decreases with the increase of temperature, and it is three seconds at temperature of 300 degrees C. The magnetism of Cu(6)Fe-MF is significantly weakened in atmosphere containing HCl or SO2, but strengthened in NO. Cu(6)Fe-MF still shows stable Hg-0 removal efficiency and magnetism after reaction for 10 h. Cu-Fe modified not only make MF to be used for mercury control of coal-fired flue gas, but enables reuse of coal-fired waste-MF, which is in line with the principles of circular economics.
机译：通过磁性分离方法从粉煤灰获得的磁体（MF）具有低汞去除效率和气相汞的弱磁性。本文用溶胶 - 凝胶法用Cu和Fe化合物改性磁体。研究了Cu-Fe改性MF的HG-0去除性能，在固定床反应器中研究，检查煅烧温度和烟气组合物对改性MF的磁性的影响。 Cu（6）Fe-MF-400的HG-0去除效率，其在MF上的6wt％Cu加载，Cu：Fe原子比为1：2，在400℃下煅烧，200℃达97％ N-2，CO 2和O-2气氛中的℃。 Cu（6）Fe-MF-400的特定磁化率从41〜52cm（3）/ g的显着增强。烟气组合物对HG-0去除的影响表明HCL显着缩短了达到80％的HG-0去除效率的所需时间，而NO和SO2延长这一必要时间。在100-350℃的反应温度范围内，随着温度的增加，所需的时间随着温度的增加而降低，在300℃的温度下为三秒钟。Cu（6）Fe-MF的磁性在含有大气中显着减弱HCl或SO2，但没有加强。 Cu（6）Fe-MF仍显示在反应10小时后显示出稳定的HG-0去除效率和磁性。 Cu-Fe改性不仅使MF用于燃煤烟气的汞控制，而是能够重用燃煤废物MF，这符合循环经济学的原理。

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  • 来源
    《Fuel》 |2020年第jul1期|117668.1-117668.9|共9页
  • 作者

    Li Yang; Dang Lixin; Yang He; Li Jie; Hu Haoquan;

  • 作者单位

    Dalian Univ Technol Inst Coal Chem Engn State Key Lab Fine Chem Sch Chem Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Inst Coal Chem Engn State Key Lab Fine Chem Sch Chem Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Inst Coal Chem Engn State Key Lab Fine Chem Sch Chem Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Inst Coal Chem Engn State Key Lab Fine Chem Sch Chem Engn Dalian 116024 Peoples R China;

    Dalian Univ Technol Inst Coal Chem Engn State Key Lab Fine Chem Sch Chem Engn Dalian 116024 Peoples R 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

    Magnetosphere; Hg-0 removal; Flue gas; Cu-Fe modification; Magnetism;

    机译：磁性影极;HG-0去除;烟气;CU-FE改性;磁性;

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