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Enrichment characteristics, thermal stability and volatility of hazardous trace elements in fly ash from a coal-fired power plant

机译：燃煤电厂粉煤灰中有害微量元素的富集特性，热稳定性和挥发性

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摘要

Release of hazardous trace elements (HTEs) during re -use of coal-fired fly ash involving heat treatment process can cause health risks for on -site workers and contaminate the surrounding environment. Enrichment characteristics, thermal stability and volatility of five HTEs (Hg, As, Pb, Cr, Mn) in fly ash collected from a 660 MW coal-fired power plant were investigated. Brunauer-Emmett-Teller (BET), scanning electron microscope- energy dispersive spectrometer (SEM-EDS), and X-ray power diffraction spectrometry (XRD) were used to characterize pore structure and chemical composition of the coal-fired fly ash (CFA) samples. Results show that the coal belongs to bituminous, containing low content of S, Cl, and the HTEs analyzed. CFA samples have low content of Hg (0.04-0.20 mg/kg) and As (3.0-8.7 mg/kg), and high content of Mn (782.46-1115.85 mg/kg). Burnout degree and specific surface area result in the decreasing HTEs concentration in CFA samples when increasing the particle size. Relative enrichment index (REI) of HTEs in the raw CFA are in the order of Mn Cr Pb 1 As Hg. Increase in particle sizes leads to decrease of the REI value, implies that HTEs are enriched more in finer fractions. Thermal stability of HTEs in CFA samples becomes weaker at higher temperature. The smaller the particle size is, the worse the thermal stability becomes. Volatilization fractions of Hg, As, Pb, Cr, and Mn in CFA samples at four temperatures (350 degrees C, 550 degrees C, 750 degrees C, 950 degrees C) range 88.35%-99.50%, 2.32%-23.17%, 4.08%-22.59%, 20.36%-34.43%, and 1.21%-23.43%, respectively. The derivative of the concentration -fitted curve to the temperature in the range of 20-900 C at heating rate of 10 degrees C/min indicates volatility of HTEs in CFA follows the decreasing order of Hg As, Cr Mn, Pb.
机译：在涉及热处理过程的燃煤粉煤灰再利用过程中释放有害微量元素（HTE）可能对现场工人造成健康风险并污染周围环境。研究了从660 MW燃煤电厂收集的粉煤灰中五种HTE（汞，砷，铅，铬，锰）的富集特性，热稳定性和挥发性。使用Brunauer-Emmett-Teller（BET），扫描电子显微镜-能量色散光谱仪（SEM-EDS）和X射线功率衍射光谱仪（XRD）表征了燃煤粉煤灰（CFA）的孔结构和化学成分）样品。结果表明，该煤属于烟煤，其硫，氯和HTE含量低。 CFA样品中的Hg（0.04-0.20 mg / kg）和As（3.0-8.7 mg / kg）含量低，Mn（782.46-1115.85 mg / kg）含量高。当增加粒径时，燃尽程度和比表面积会导致CFA样品中的HTE浓度降低。原始CFA中HTE的相对富集指数（REI）依次为Mn> Cr> Pb> 1> As> Hg。粒度增加导致REI值降低，这意味着HTE的细小部分含量更高。 CFA样品中HTE的热稳定性在较高温度下变得较弱。粒径越小，热稳定性越差。 CFA样品在四种温度（350摄氏度，550摄氏度，750摄氏度，950摄氏度）下Hg，As，Pb，Cr和Mn的挥发分数范围为88.35％-99.50％，2.32％-23.17％，4.08 ％-22.59％，20.36％-34.43％和1.21％-23.43％。在10摄氏度/分钟的加热速率下，浓度拟合曲线对温度在20-900摄氏度范围内的导数表明，CFA中HTE的挥发性遵循Hg> As，Cr> Mn，Pb的降序。

著录项

  • 来源
    《Fuel》 |2018年第1期|490-498|共9页
  • 作者

    Zhao Shilin; Duan Yufeng; Lu Jincheng; Liu Shuai; Pudasainee Deepak; Gupta Rajender; Liu Meng; Lu Jianhong;

  • 作者单位

    Southeast Univ, Sch Energy & Environm, Key Lab Energy Thermal Convers & Control, Minist Educ, Nanjing 210096, Jiangsu, Peoples R China|Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada;

    Southeast Univ, Sch Energy & Environm, Key Lab Energy Thermal Convers & Control, Minist Educ, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Sch Energy & Environm, Key Lab Energy Thermal Convers & Control, Minist Educ, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Sch Energy & Environm, Key Lab Energy Thermal Convers & Control, Minist Educ, Nanjing 210096, Jiangsu, Peoples R China;

    Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada;

    Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada;

    Southeast Univ, Sch Energy & Environm, Key Lab Energy Thermal Convers & Control, Minist Educ, Nanjing 210096, Jiangsu, Peoples R China;

    Southeast Univ, Sch Energy & Environm, Key Lab Energy Thermal Convers & Control, Minist Educ, Nanjing 210096, Jiangsu, 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

    Coal-fired fly ash; Hazardous trace elements; Enrichment characteristics; Thermal stability; Volatility;

    机译：燃煤飞灰;有害微量元素;富集特性;热稳定性;挥发性;

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