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典型低阶煤热解过程中镉元素的释放规律

周玲妹 王晓兵 马晨 刘爽 马茂林 刘姣姣

周玲妹, 王晓兵, 马晨, 刘爽, 马茂林, 刘姣姣. 典型低阶煤热解过程中镉元素的释放规律[J]. 燃料化学学报. doi: 10.1016/S1872-5813(21)60066-X
引用本文: 周玲妹, 王晓兵, 马晨, 刘爽, 马茂林, 刘姣姣. 典型低阶煤热解过程中镉元素的释放规律[J]. 燃料化学学报. doi: 10.1016/S1872-5813(21)60066-X
ZHOU Ling-mei, WANG Xiao-bing, MA Chen, LIU Shuang, MA Mao-lin, LIU Jiao-jiao. Volatility of Cd in typical low rank coal during pyrolysis[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(21)60066-X
Citation: ZHOU Ling-mei, WANG Xiao-bing, MA Chen, LIU Shuang, MA Mao-lin, LIU Jiao-jiao. Volatility of Cd in typical low rank coal during pyrolysis[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(21)60066-X

典型低阶煤热解过程中镉元素的释放规律

doi: 10.1016/S1872-5813(21)60066-X
基金项目: 国家重点研究发展计划(2016YFB0600304),国家自然基金青年基金(51604280)和中央高校基本科研业务费专项资金(2020NQ10,2020YQHH08)资助
详细信息
    通讯作者:

    Tel:010-62339616,E-mail:lingmeizhou@hotmail.com

  • 中图分类号: TQ536

Volatility of Cd in typical low rank coal during pyrolysis

Funds: The project was supported by the National Key Research and Development Program of China (2016YFB0600304), the National Natural Science Foundation of China (51604280) and the Fundamental Research Funds for the Central Universities (2020NQ10, 2020YQHH08)
  • 摘要: 将新疆淖毛湖煤(NMH)和内蒙高硫煤(GL)逐级化学提取,考察镉(Cd)在原煤中的赋存形态分布;分别在400−800 ℃、卧式/立式管式炉对原煤热解,考察赋存形态、热解终温、升温速率和停留时间对Cd释放规律的影响;利用FactSage软件模拟在理想条件下Cd的迁移和转化。结果表明:NMH和GL中Cd的赋存形态分布分别为有机质结合态(46%与37%)、碳酸盐结合态(32%与24%)、二硫化物结合态(12%与1%)、铝硅酸盐结合态(10%与38%)。Cd的赋存形态分布严重影响其挥发行为,有机质结合态易在低温区挥发,而碳酸盐、铝硅酸盐和硫化物结合态需在中高温区挥发;降低热解速率与延长停留时间有助于Cd的释放。FactSage模拟表明NMH和GL中Cd的气态产物主要有Cd、CdO、Cd(OH)x和CdS,Cd在两种煤中挥发行为的差异主要是由热解温度、赋存形态分布以及煤阶决定,模拟与实验结果吻合较好。
  • 图  1  原煤XRD图谱

    Figure  1.  XRD patterns of raw coal. (Q-quartz (SiO2); K-kaolinite (Al4(Si4O10)(OH)8); P-pyrite (FeS2); S-Gypsum (CaSO4); C-calcite (CaCO3)

    图  2  (a)卧式管式炉示意图(b)立式管式炉示意图

    Figure  2.  (a) Schematic diagram of horizontal tubular furnace (b) Schematic diagram of vertical tubular furnace

    图  3  NMH和GL中矿物(a)和Cd(b)提取率

    Figure  3.  Extraction rate of minerals (a) and Cd (b) in NMH and GL coal

    图  4  NMH和GL原煤TG(a)和DTG(b)分析

    Figure  4.  TG (a) and DTG (b) analyses of NMH and GL coal

    图  5  NMH和GL中Cd的挥发率(a)和反应速率(b)

    Figure  5.  Volatility (a) and reaction rate (b) of Cd in NMH and GL coal

    图  6  快慢速热解时NMH中Cd的释放率

    Figure  6.  Volatility of Cd of NMH in mild and fast pyrolysis

    图  7  快速热解时Cd在停留时间10 min、30 min、60 min时的释放率(a)和反应速率(b)

    Figure  7.  Volatility and reaction rate of Cd in holding time of 10, 30 and 60 min by fast pyrolysis

    图  8  FactSage热力学模拟计算

    Figure  8.  FactSage thermochemical calculation

    表  1  原煤基本性质

    Table  1.   Basic properties of NMH and GL raw coal

    SampleNMHGL
    Proximate analysis (wt%)
    Mad9.1610.13
    Ad9.9512.13
    Vdaf52.7638.49
    FCdaf47.2461.51
    Ultimate analysis (wt%)
    Cdaf77.4176.72
    Hdaf6.605.07
    Odaf (calculated by dirrerence)13.2215.84
    Ndaf2.160.81
    St,d0.551.77
    Ash composition (wt%, d)
    SiO239.3532.57
    Al2O316.6414.03
    Fe2O35.8810.11
    CaO23.3017.00
    Na2O2.950.57
    MgO1.236.43
    K2O0.380.42
    SO38.8317.84
    Concentration of Cd (μg·g−1)0.0480.043
    下载: 导出CSV

    表  2  逐级化学提取步骤

    Table  2.   Sequential chemical extraction procedure

    StepReagentExtraction time/hTemperature/℃Extraction mode
    15 mol·L−1 HCl660Bound to carbonate
    240% HF660Bound to aluminosilicate
    35 mol·L−1 HNO3645Bound to disulfide
    430% H2O2685Bound to organic mater
    下载: 导出CSV

    表  3  计算时输入的参数

    Table  3.   Parameters for calculation

    Major elementMass/gAsh componentMass/gTrace elementMass/g
    NMH
    C633.2CaO34Cd4.8E-5
    H54Na2O3
    O108.1SiO229.7
    N17.7Fe2O39.9
    S5Al2O313
    MgO1.2
    GL
    C767.2CaO20.6Cd4.3E-5
    H50.7Na2O0.7
    O158.4SiO239.5
    N8.1Fe2O312.3
    S17.7Al2O317
    MgO7.8
    下载: 导出CSV
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  • 网络出版日期:  2021-03-11

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