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准东煤流化床气化飞灰的理化特性研究

张玉魁 张海霞 朱治平

张玉魁, 张海霞, 朱治平. 准东煤流化床气化飞灰的理化特性研究[J]. 燃料化学学报, 2016, 44(3): 305-313.
引用本文: 张玉魁, 张海霞, 朱治平. 准东煤流化床气化飞灰的理化特性研究[J]. 燃料化学学报, 2016, 44(3): 305-313.
ZHANG Yu-kui, ZHANG Hai-xia, ZHU Zhi-ping. Physical and chemical properties of fly ash from fluidized bed gasification of Zhundong coal[J]. Journal of Fuel Chemistry and Technology, 2016, 44(3): 305-313.
Citation: ZHANG Yu-kui, ZHANG Hai-xia, ZHU Zhi-ping. Physical and chemical properties of fly ash from fluidized bed gasification of Zhundong coal[J]. Journal of Fuel Chemistry and Technology, 2016, 44(3): 305-313.

准东煤流化床气化飞灰的理化特性研究

基金项目: 

国家自然科学基金 21306193

详细信息
    通讯作者:

    张海霞, Tel: 13488774933,E-mail: zhanghaixia@iet.cn

  • 中图分类号: TQ544

Physical and chemical properties of fly ash from fluidized bed gasification of Zhundong coal

Funds: 

The project was supported by the National Natural Science Foundation of China 21306193

  • 摘要: 采用灰熔点测定仪、X射线荧光光谱仪、扫描电镜和热重分析仪等方法, 研究了准东煤流化床气化飞灰的灰熔融特性、物理结构和化学组成及气化反应活性.结果表明, 准东煤与其流化床气化飞灰中SiO2、Fe2O3、Na2O和CaO等矿物质含量存在显著的差异, 但飞灰的灰熔点与原煤无明显差异.准东煤气化飞灰具有较宽的粒径范围, 呈现双峰分布特征, 且不同粒径区间飞灰的元素含量存在显著差异.提高气化温度, 有利于提高飞灰的气化反应活性.准东煤流化床气化飞灰石墨化程度比煤焦要高, 但其孔隙结构更为发达, 含有丰富的中孔和中大孔, 使得飞灰的气化反应活性高于煤焦.可通过提高气化温度、循环再气化的方法提高气化效率.
  • 图  1  实验系统示意图

    Figure  1  Schematic diagram of experimental apparatus

    1: gasifier; 2: electric heater; 3: primary cyclone separator; 4: secondary cyclone separator; 5: screw feeder; 6: air chamber; 7: air compressor; 8: N2 cylinder; 9: mass flowmeter; 10: gas sampling port

    图  2  实验系统运行温度分布特性

    Figure  2  Temperature profiles of experimental apparatus

    图  3  高温高通量水平管式炉制焦实验系统示意图

    Figure  3  Schematic diagram of the pyrolysis system

    1: N2 cylinder; 2: flowmeter; 3: reactor; 4: electric furnace; 5: temperature controller; 6: thermocouple; 7: crucible; 8: exhaust pipe; 9: push rod; 10: heating zone

    图  4  准东煤气化飞灰的粒径分布

    Figure  4  Particle size distribution of Fzd

    图  5  准东煤、煤焦与气化飞灰的SEM照片

    Figure  5  SEM images of Czd, Jzd and Fzd

    (a): Czd; (b): Jzd; (c): Fzd

    图  6  准东煤气化飞灰与煤焦的XRD谱图

    Figure  6  XRD patterns of Fzd and Jzd

    1: NaCl; 2: CaSO4; 3: SiO2; 4: NaAlSi2O6; 5: CaO; 6: NaAlSi3O8; 7: Ca12Al14O33

    图  7  准东煤气化飞灰及煤焦的孔径分布

    Figure  7  Pore size distribution of Fzd and Jzd

    图  8  气化温度对反应活性的影响

    Figure  8  Effect of temperature on gasification reactivity

    (a): carbon conversion to time; (b): reaction rates to carbon conversion

    图  9  准东煤气化飞灰及煤焦气化反应活性

    Figure  9  Gasification reactivity of Fzd and Jzd

    表  1  准东五彩湾煤及其气化飞灰的工业分析和元素分析

    Table  1  Proximate and ultimate analysis of Czd and Fzd

    SampleProximate analysis wad /%Ultimate analysis wad /%
    MAVFCCHONSCl
    Czd15.645.0334.0645.2754.411.7022.130.690.400.10
    Fzd4.1520.447.8267.5971.840.600.770.561.640.45
    下载: 导出CSV

    表  2  准东煤及其气化飞灰灰成分分析

    Table  2  Ash compositions of Czd and Fzd

    SampleAsh compositions w /%
    SiO2Al2O3Fe2O3CaOMgOSO3TiO2P2O5K2ONa2O
    Czd17.2411.905.7628.745.3419.580.600.050.383.92
    Fzd13.1011.497.3137.485.3920.590.520.080.361.53
    下载: 导出CSV

    表  3  准东煤及其气化飞灰的灰熔融性

    Table  3  Ash fusibility characteristics of Czd and Fzd

    SampleAsh fusion temperature t/℃
    DTSTHTFT
    Czd1 3101 3201 3401 350
    Fzd1 2901 3201 3301 360
    下载: 导出CSV

    表  4  粒径分布对准东煤气化飞灰元素含量的影响

    Table  4  Effect of particle size distribution on element compositions of Fzd

    Particle size d /μmElement concentration w* /%
    NaKCaMgFeAlSiSCl
    < 308.200.9833.3110.369.3315.178.888.182.87
    30-636.741.3037.878.549.3711.736.7311.783.16
    63-1804.131.0842.458.659.3711.853.6713.812.36
    > 1801.940.5645.468.858.0013.142.6915.751.52
    *: after deduction of combustible elements
    下载: 导出CSV

    表  5  准东煤气化飞灰与煤焦的孔隙结构

    Table  5  Pore structures of Fzd and Jzd

    SampleBET surface area
    A /(m2·g-1)
    Total pore volume
    v /(cm3·g-1)
    Jzd107.440.06
    Fzd365.240.22
    下载: 导出CSV
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出版历程
  • 收稿日期:  2015-07-01
  • 修回日期:  2015-10-12
  • 网络出版日期:  2021-01-23
  • 刊出日期:  2016-03-30

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