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基于氮气吸附-核磁共振分析的煤气化细渣孔隙结构特征

于伟 刘莉君 高博 王丽娜 岳双凌

于伟, 刘莉君, 高博, 王丽娜, 岳双凌. 基于氮气吸附-核磁共振分析的煤气化细渣孔隙结构特征[J]. 燃料化学学报, 2022, 50(8): 966-973. doi: 10.19906/j.cnki.JFCT.2022017
引用本文: 于伟, 刘莉君, 高博, 王丽娜, 岳双凌. 基于氮气吸附-核磁共振分析的煤气化细渣孔隙结构特征[J]. 燃料化学学报, 2022, 50(8): 966-973. doi: 10.19906/j.cnki.JFCT.2022017
YU Wei, LIU Li-jun, GAO Bo, WANG Li-na, YUE Shuang-ling. Pore structure of coal gasification fine slag based on nitrogen adsorption and nuclear magnetic resonance analysis[J]. Journal of Fuel Chemistry and Technology, 2022, 50(8): 966-973. doi: 10.19906/j.cnki.JFCT.2022017
Citation: YU Wei, LIU Li-jun, GAO Bo, WANG Li-na, YUE Shuang-ling. Pore structure of coal gasification fine slag based on nitrogen adsorption and nuclear magnetic resonance analysis[J]. Journal of Fuel Chemistry and Technology, 2022, 50(8): 966-973. doi: 10.19906/j.cnki.JFCT.2022017

基于氮气吸附-核磁共振分析的煤气化细渣孔隙结构特征

doi: 10.19906/j.cnki.JFCT.2022017
基金项目: 国家重点研发计划(2020YFC1910000)和陕西省自然科学基础研究计划项目(2021JLM-15)资助
详细信息
    作者简介:

    于伟(1985- ),男,山东昌邑人,工程师。E-mail:yuweiba@163.com

  • 中图分类号: X752

Pore structure of coal gasification fine slag based on nitrogen adsorption and nuclear magnetic resonance analysis

Funds: The project was supported by National Key Research and Development Program (2020YFC1910000) and Natural Science Basic Research Plan in Shaanxi Province of China (2021JLM-15).
  • 摘要: 本研究以宁夏地区煤气化细渣为研究对象,通过低温氮气吸附-脱附、扫描电镜以及低场核磁共振对不同粒度级产品孔隙结构进行了表征与分析。孔隙形态以裂缝形为主,各粒级产品BET比表面积较大,为125.78−589.78 m2/g,扫描电镜分析表明,BJH孔径与实际相差较大,仅以低温氮气吸附法分析孔隙结构具有一定的局限性。低场核磁共振法表明,各粒度级产品孔径均含有微孔、过渡孔、中孔和大孔,总孔隙度均在27%左右,以中孔、大孔为主,微孔次之,过渡孔较少。该种孔隙结构表明煤气化细渣不同粒度级产品均具有一定的吸附性能,但中大孔为水分的主要储存空间,导致脱水困难。
  • FIG. 1766.  FIG. 1766.

    FIG. 1766.  FIG. 1766.

    图  1  各粒级产品的N2吸附-脱附等温曲线

    Figure  1  Nitrogen adsorption curves of each particle size products

    图  2  吸附回线与孔隙形态的对应关系[18]

    Figure  2  Relationship between hysteresis loop and the pore’s morphology[18]

    图  3  各粒度级产品烧失量及比表面积关系

    Figure  3  Relationship between loss on ignition and specific surface area of products of various particle sizes

    图  4  各粒度级产品氮气吸附孔径分布

    Figure  4  Pore size distribution of nitrogen adsorption of various particle sizes

    图  5  各粒度级产品的SEM分析(×1000倍)

    Figure  5  SEM analysis of products of each particle size (×1000)

    图  6  不同粒度级产品核磁共振分析孔径分布特征

    Figure  6  Pore size distribution characteristics of products with different particle sizes analyzed by NMR

    图  7  不同粒度级产品核磁分析孔隙类型分布

    Figure  7  Pore type distribution of products with different particle sizes by NMR analysis

    表  1  煤气化细渣基本性质分析

    Table  1  Basic properties analysis of coal gasification fine slag

    Mt/%Mad/%Ad/%Vdaf/%FCad/%St,d/%Qgr,d/(cal·g−1)Qnet,ar/(cal·g−1)
    69.216.5150.0410.5637.310.283809790
    下载: 导出CSV

    表  2  煤气化细渣筛分

    Table  2  Particle size distributions of coal gasification fine slag

    Particle size/mmYield/%Ash content/%Cumulative yield/%Cumulative ash content/%
    +0.55.5517.255.5517.25
    0.5−0.2512.2812.3917.8313.90
    0.25−0.12520.2017.3038.0315.71
    0.125−0.0747.8238.2645.8519.55
    0.074−0.0454.8865.9550.7324.02
    −0.04549.2777.60100.0050.42
    Total100.0050.42
    下载: 导出CSV

    表  3  各粒度级产品的孔隙结构参数

    Table  3  Pore structure parameters of products of various particle sizes

    Particle size/mmLoss on ignition/%BET surface area/(m2·g−1)BJH total pore volume/(cm3·g−1)Pore diameter/nm
    +0.582.75125.780.0832.65
    0.5−0.2587.61285.630.2012.82
    0.25−0.12582.70504.260.4963.94
    0.125−0.07461.74589.780.6544.44
    0.074−0.04534.05423.500.4984.70
    −0.04522.40212.150.3915.86
    下载: 导出CSV
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  • 收稿日期:  2022-01-24
  • 录用日期:  2022-03-10
  • 修回日期:  2022-02-21
  • 网络出版日期:  2022-03-18
  • 刊出日期:  2022-08-26

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