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水煤浆气化细渣的组成结构特征及干法脱炭研究

高影 赵伟 周安宁 韩瑞 李振 张宁宁 王俊哲 马超

高影, 赵伟, 周安宁, 韩瑞, 李振, 张宁宁, 王俊哲, 马超. 水煤浆气化细渣的组成结构特征及干法脱炭研究[J]. 燃料化学学报, 2022, 50(8): 954-965. doi: 10.1016/S1872-5813(22)60007-0
引用本文: 高影, 赵伟, 周安宁, 韩瑞, 李振, 张宁宁, 王俊哲, 马超. 水煤浆气化细渣的组成结构特征及干法脱炭研究[J]. 燃料化学学报, 2022, 50(8): 954-965. doi: 10.1016/S1872-5813(22)60007-0
GAO Ying, ZHAO Wei, ZHOU An-ning, HAN Rui, LI Zhen, ZHANG Ning-ning, WANG Jun-zhe, MA Chao. Study on the composition and structure characteristics and dry decarbonization separation of coal water slurry gasification fine slag[J]. Journal of Fuel Chemistry and Technology, 2022, 50(8): 954-965. doi: 10.1016/S1872-5813(22)60007-0
Citation: GAO Ying, ZHAO Wei, ZHOU An-ning, HAN Rui, LI Zhen, ZHANG Ning-ning, WANG Jun-zhe, MA Chao. Study on the composition and structure characteristics and dry decarbonization separation of coal water slurry gasification fine slag[J]. Journal of Fuel Chemistry and Technology, 2022, 50(8): 954-965. doi: 10.1016/S1872-5813(22)60007-0

水煤浆气化细渣的组成结构特征及干法脱炭研究

doi: 10.1016/S1872-5813(22)60007-0
基金项目: 陕西省技术创新引导专项-区域创新能力引导计划(2021QFY04-01)资助
详细信息
    通讯作者:

    Tel:029-85583549, 029-85583183, E-mail:psu564@139.com

    lizhenac@126.com

  • 中图分类号: TQ536

Study on the composition and structure characteristics and dry decarbonization separation of coal water slurry gasification fine slag

Funds: The project was supported by the Special Project of Technology Innovation Guidance of Shaanxi (2021QFY04-01)
  • 摘要: 本研究以水煤浆气化细渣(CWSFS)为研究对象,将其通过湿法筛分分级,采用工业分析、XRF、XRD、BET、SEM等手段考察粒度组成与结构特征的关系,并提出CWSFS的分类方法,用以指导煤气化灰渣的分质高值化利用;再采用粉碎解离-气流分级联合处理方法开展了水煤浆气化细渣的干法分选研究。结果表明,不同粒级CWSFS,在固定碳含量、灰组成、矿物类型上有明显差异。≥74 μm粒级的CWSFS中,固定碳含量>60%、发热量>20 MJ/kg,比表面积较高,主要为残炭,并含有磁铁矿和板钛矿;13−74 μm粒级的CWSFS中,固定碳含量为20%−60%、发热量为11−19 MJ/kg,比表面积较小,矿物类型主要为辉石、白铁矿和赤铁矿等;0−13 μm粒级的CWSFS中,固定碳含量低于20%、发热量低于10 MJ/kg,主要为富含铝、铁、钙等非晶态玻璃相、石英和少量铁橄榄石、白云母等矿物。根据不同粒级CWSFS的特征,将上述三个组分分别定义为高炭组分、中炭组分和低炭组分。干法分选试验表明,与圆盘粉碎-分级工艺相比,采用气流粉碎-分级工艺可获得产率为29.60%、烧失量高达93.76%的产品,气流粉碎有助于提高残炭的分级分离富集率。
  • FIG. 1765.  FIG. 1765.

    FIG. 1765.  FIG. 1765.

    图  1  粉碎-气流分级流程示意图

    Figure  1  Combined process of crushing and airflow classification

    (a): disc crushing and airflow classification; (b): airflow crushing and airflow classification

    图  2  水煤浆气化细渣各粒级固定碳含量

    Figure  2  Fixed carbon content of different particle size grades of CWSFS

    图  3  水煤浆气化细渣各粒级的XRD谱图

    Figure  3  XRD spectra of size-segmented CWSFS

    Q: Quartz; M: Magnetite; H: Hematite; D: Diopside; B: Brookite; 2M: Muscovite; A: Anhydrite; N: Nepheline; 2F: Fayalite; 3F: Marcasite

    图  4  CWSFS各粒级样品的红外光谱谱图

    Figure  4  FT-IR spectra of size-segmented CWSFS

    图  5  水煤浆气化细渣各粒级扫描电镜照片

    Figure  5  SEM of size-segmented CWSFS

    图  6  水煤浆气化细渣各粒级的N2吸附-脱附等温曲线

    Figure  6  N2 adsorption curve of size-segmented CWSFS

    图  7  水煤浆气化细渣各粒级孔径分布

    Figure  7  Pore size distribution of size-segmented CWSFS

    图  8  CWSFS圆盘粉碎-气流分级后各产品烧失量及产率

    Figure  8  Ignition loss and yield of each product after crushed and combined airflow classification

    图  9  气流粉碎各产品产率及烧失量

    Figure  9  Yield and loss on ignition of each product in airflow crushed

    图  10  不同粉碎方式下CWSFS各产品的SEM照片

    Figure  10  SEM images of CWSFS products using different crushing methods

    表  1  水煤浆气化细渣的工业分析和元素分析

    Table  1  Proximate and ultimate analyses of coal-water slurry gasification fine slag

    Proximate analysis w/%Ultimate analysis wad/%Qgr,d/(MJ·kg−1)
    MadAadVdafFCadCHONSt
    6.4129.1520.8643.5854.172.313.251.113.6025.13
    下载: 导出CSV

    表  2  水煤浆气化细渣粒度特性

    Table  2  Characteristics of CWSFS in different particle size grades

    Particle size/μmYield/%Ash content/%Fixed carbon content/%Loss on ignition/%Calorific value/(MJ·kg−1)
    >9850.8315.9970.3585.5226.214
    74−985.6624.5561.8873.2123.835
    45−7413.8937.7939.9368.9515.223
    22−456.4149.9728.3157.5713.249
    13−227.8650.0525.8647.312.198
    0−1315.3559.2519.3445.79.081
    Total10029.1843.5872.5925.126
    下载: 导出CSV

    表  3  水煤浆气化细渣各粒级氧化物含量

    Table  3  Oxide content of size-segmented CWSFS

    Particle size/μmComposition w/%
    SiO2Al2O3Fe2O3CaOK2OTiO2SO3ZnOCr2O3MnOSrOCuOV2O5
    >98038.5521.1625.211.031.6810.260.3400.400.670.250
    74−9823.6620.4318.0624.251.151.469.690.2700.370.2100
    45−7416.8418.9929.6122.501.611.557.38000.520.5900.14
    22−4533.8822.5515.4919.021.731.285.38000.280.1400.10
    13−2240.7221.7112.5215.861.781.244.690.780.170.22000
    0−1334.9124.1015.7216.292.041.693.090.980.410.26000
    CWSFS21.0927.9620.7019.831.851.645.2800.280.370.5800
    下载: 导出CSV

    表  4  水煤浆气化细渣EDS分析

    Table  4  EDS analysis of CWSFS

    MorphologyParticle size/μmElement w/%
    CONaAlSiSKCaTiVFeSr
    Porous irregular particles>9875.715.10.181.033.360.90.211.050.1301.810.57
    74−9885.37.840.130.752.80.720.170.710.150.040.790.64
    Block particles>9876.1120.441.312.942.090.212.220.090.071.610.93
    74−9873.520.20.20.822.240.240.120.870.1201.090.63
    45−7473.819.40.20.992.440.320.171.060.110.010.890.67
    22−4563.721.50.241.425.951.40.351.570.130.031.742
    13−225419.70.42.79.941.480.62.90.2904.843.16
    Spherical particles>989.8641.52.866.4411.51.020.516.030.4018.21.75
    74−989.66432.86.25110.710.465.590.30.1418.21.87
    45−7426.736.824.928.820.940.414.630.25013.21.31
    22−4517.642.52.817.131.980.690.446.160.30191.37
    13−2224.734.62.36.610.90.60.45.610.31012.31.68
    0−1320.536.83.016.8210.40.740.525.980.21013.81.24
    Floccule0−1335.939.52.274.77.350.20.572.510.260.056.180.59
    下载: 导出CSV

    表  5  水煤浆气化细渣各粒径的孔隙特征参数

    Table  5  Pore characteristic parameters of size-segmented CWSFS

    Particle size/μmSpecific surface area/(m2·g−1)Total pore volume/(cm3·g−1)Average aperture/nm
    >9867.800.0416.21
    74−98216.930.1475.52
    45−7441.260.0247.42
    22−4546.470.0447.08
    13−2259.010.0707.57
    0−1358.860.0929.80
    CWSFS44.590.0527.12
    下载: 导出CSV

    表  6  水煤浆气化细渣的分类指标及不同类型组分的组成结构特征

    Table  6  Classification indexes of CWSFS and composition and structure characteristics of different types of components

    Classification indexTypeStructure and composition characteristics of different types of components
    fixed carbon content/%calorific value/(MJ·kg−1)particle size range/μmmicro morphological characteristicspore structure
    characteristics (specific
    surface area)/
    (m2·g−1)
    main mineral composition
    >60>20high carbon component>74porous irregular particle, block particle>67magnetite, brookite
    20−6011−19medium carbon component13−74block particle, spherical particle40−60pyroxene, marcasite, hematite
    <20<10low carbon component<13floccule<60quartz, fayalite,
    muscovite
    下载: 导出CSV

    表  7  不同粉碎方式下球形颗粒的面积统计

    Table  7  Statistical results of spherical particle projected area using different crushing methods

     CWSFS productTotal area of spherical
    particles/μm2
    Ratio of spherical particles to
    total sample area/%
    Disc crushed for 3 min253.88179.4034
    Disc crushed for 6 min189.45175.8623
    Disc crushed for 9 min56.41011.7996
    Airflow crushed
    graded frequency 20 Hz
    58.33241.7501
    Airflow crushed
    graded frequency 35 Hz
    130.16134.3221
    Airflow crushed
    graded frequency 50 Hz
    183.06215.4915
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-01-17
  • 录用日期:  2022-03-11
  • 修回日期:  2022-03-04
  • 网络出版日期:  2022-03-18
  • 刊出日期:  2022-08-26

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