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气流床气化细渣中残炭的结构特征及燃烧特性研究

吕登攀 白永辉 王焦飞 宋旭东 苏暐光 于广锁 祝贺 唐广军

吕登攀, 白永辉, 王焦飞, 宋旭东, 苏暐光, 于广锁, 祝贺, 唐广军. 气流床气化细渣中残炭的结构特征及燃烧特性研究[J]. 燃料化学学报, 2021, 49(2): 129-136. doi: 10.1016/S1872-5813(21)60011-7
引用本文: 吕登攀, 白永辉, 王焦飞, 宋旭东, 苏暐光, 于广锁, 祝贺, 唐广军. 气流床气化细渣中残炭的结构特征及燃烧特性研究[J]. 燃料化学学报, 2021, 49(2): 129-136. doi: 10.1016/S1872-5813(21)60011-7
LÜ Deng-pan, BAI Yong-hui, WANG Jiao-fei, SONG Xu-dong, SU Wei-guang, YU Guang-suo, ZHU he, TANG Guang-jun. Structural features and combustion reactivity of residual carbon in fine slag from entrained-flow gasification[J]. Journal of Fuel Chemistry and Technology, 2021, 49(2): 129-136. doi: 10.1016/S1872-5813(21)60011-7
Citation: LÜ Deng-pan, BAI Yong-hui, WANG Jiao-fei, SONG Xu-dong, SU Wei-guang, YU Guang-suo, ZHU he, TANG Guang-jun. Structural features and combustion reactivity of residual carbon in fine slag from entrained-flow gasification[J]. Journal of Fuel Chemistry and Technology, 2021, 49(2): 129-136. doi: 10.1016/S1872-5813(21)60011-7

气流床气化细渣中残炭的结构特征及燃烧特性研究

doi: 10.1016/S1872-5813(21)60011-7
基金项目: 国家自然科学基金 (21968024)和宁夏重点研发计划引才专项(2019BEB04001)资助
详细信息
    通讯作者:

    Tel:0951-2062008,E-mail:yhbai@nxu.edu.cn

  • 中图分类号: TQ536.4

Structural features and combustion reactivity of residual carbon in fine slag from entrained-flow gasification

Funds: The project was supported by the National Natural Science Foundation of China (21968024) and the Project of Key Research Plan of Ningxia(2019BEB04001)
  • 摘要: 气流床气化过程中产生的细渣含碳量很高,目前多以填埋的方式进行处理,将细渣用于循环流化床锅炉掺烧有望为细渣处理提供有利的技术。本研究选用宁东能源化工基地典型气化工艺GE、OMB及GSP产生的气化细渣为研究对象,利用物理吸附仪、激光拉曼及热重分析仪等仪器,系统研究了气化细渣中残炭的结构特征与燃烧特性。结果表明,原始气化细渣中的物质可分为黏结球形颗粒、多孔不规则颗粒与孤立的大球形颗粒,而酸洗后的气化细渣多以疏松细小的颗粒和多孔不规则块状颗粒存在;细渣中残炭的孔径尺寸主要分布在4−8 nm,且比表面积与残炭的活性位点大小顺序均为:GE > OMB > GSP;GE渣中残炭结构有序度最低,无定形炭结构最多,GSP则相反;GE渣中残炭燃烧速率最快,主要是由于GE渣中残炭有较大的比表面积、较多的无定形炭结构及较高的的活性位点,且GE渣中残炭的综合燃烧指数为5.26 × 10−7%2/(min2·℃3)。
  • 图  1  不同气化细渣的XRD谱图

    Figure  1.  XRD patterns of different fine slag

    图  2  脱灰前后细渣的孔径分布

    Figure  2.  Characteristic curves of pore size distribution of fine slag before and after demineralization

    图  3  脱灰前后细渣的SEM照片

    Figure  3.  SEM images of fine slag before and after demineralization

    图  4  脱灰细渣中残炭的拉曼光谱及拟合峰

    Figure  4.  Raman spectrum and fitting peak of residual carbon in the demineralized fine slag

    图  5  着火温度的定义

    Figure  5.  Definition of ignition temperature

    图  6  脱灰细渣中残炭的热重分析曲线

    Figure  6.  Thermogravimetric analysis curve of residual carbon in the demineralized fine slag

    表  1  细渣的工业分析与元素分析

    Table  1.   Proximate and ultimate analyses of fine slags

    SampleProximate analysis wd/%Ultimate analysis wd/%
    VFCACHNSO*
    FSGE10.1225.2164.6720.251.030.182.0711.80
    FSOMB 3.8814.2681.8616.400.530.100.450.60
    FSGSP 6.9612.4380.6116.330.710.081.510.76
    note: V:volatile matter; FC:fixed carbon; d:dry basis; *:calculated by difference
    下载: 导出CSV

    表  2  细渣的灰分组成

    Table  2.   Ash composition of fine slags

    SampleCompositions w/%
    SiO2Al2O3Fe2O3CaONa2OK2OMgOothers
    FSGE44.8619.63 9.039.825.222.316.232.90
    FSOMB43.7220.0610.639.745.081.985.513.28
    FSGSP59.0416.95 7.606.022.062.493.482.36
    下载: 导出CSV

    表  3  脱灰前后细渣的孔隙特征参数

    Table  3.   Pore characteristic parameters of fine slag before and after demineralization

    SampleBET surface
    area/(m2·g−1)
    Pore volume/
    (× 103 cm3·g−1)
    Average
    pore diameter/nm
    FSGE160.390.2322.892
    DFSGE737.313.02616.419
    FSOMB82.500.1513.659
    DFSOMB716.792.86115.968
    FSGSP102.610.1332.591
    DFSGSP429.283.08928.786
    下载: 导出CSV

    表  4  拉曼光谱峰面积比

    Table  4.   Raman band area ratio

    ParameterDFSGEDFSOMBDFSGSP
    ID1/IG5.4304.9284.383
    IG/IAll0.1070.1240.141
    ID3/IG + D2 + D30.1640.1340.131
    ID3/IAll0.0570.0440.045
    ID4/IAll0.0670.0640.038
    ID3 + D4/IAll0.1240.1080.083
    下载: 导出CSV

    表  5  燃烧曲线的特征参数

    Table  5.   Characteristic parameters of combustion curve

    Fuelt1/℃th/℃tpeak/℃Wmax/(%·min−1)Wmean/(%·min−1)S/(%2·min−2·℃−3)
    DFSGE503.7630.2584.120.714.065.26×10−7
    DFSOMB502.7634.7554.218.554.274.94×10−7
    DFSGSP502.8745.0543.212.641.781.19×10−7
    下载: 导出CSV
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  • 收稿日期:  2020-09-24
  • 修回日期:  2020-11-10
  • 刊出日期:  2021-02-08

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