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煤焦油沥青族组成对针状焦中间相结构的影响

林雄超 盛喆 邵苛苛 许德平 王永刚

林雄超, 盛喆, 邵苛苛, 许德平, 王永刚. 煤焦油沥青族组成对针状焦中间相结构的影响[J]. 燃料化学学报, 2021, 49(2): 151-159. doi: 10.19906/j.cnki.JFCT.2021008
引用本文: 林雄超, 盛喆, 邵苛苛, 许德平, 王永刚. 煤焦油沥青族组成对针状焦中间相结构的影响[J]. 燃料化学学报, 2021, 49(2): 151-159. doi: 10.19906/j.cnki.JFCT.2021008
LIN Xiong-chao, SHENG Zhe, SHAO Ke-ke, XU De-ping, WANG Yong-gang. Influence of group component distribution of coal tar pitch on mesophase structure development of needle coke[J]. Journal of Fuel Chemistry and Technology, 2021, 49(2): 151-159. doi: 10.19906/j.cnki.JFCT.2021008
Citation: LIN Xiong-chao, SHENG Zhe, SHAO Ke-ke, XU De-ping, WANG Yong-gang. Influence of group component distribution of coal tar pitch on mesophase structure development of needle coke[J]. Journal of Fuel Chemistry and Technology, 2021, 49(2): 151-159. doi: 10.19906/j.cnki.JFCT.2021008

煤焦油沥青族组成对针状焦中间相结构的影响

doi: 10.19906/j.cnki.JFCT.2021008
基金项目: 国家自然科学基金面上项目(21978319)和国家重点研发计划项目(2016YFB060030301)资助
详细信息
    通讯作者:

    E-mail:linxiongchao@163.com

  • 中图分类号: TQ522.65

Influence of group component distribution of coal tar pitch on mesophase structure development of needle coke

Funds: The project was supported by the National Natural Science Foundation of China (21978319), National Key Research and Development Program (2016YFB0600303031)
  • 摘要: 原料沥青的族组成是决定针状焦品质的关键因素。采用超声溶剂萃取对煤焦油沥青进行组分分离,并对沥青族组成进行混合再调配,以探究不同组分对生焦中间相结构形成及发育的影响并进行优化。研究表明,正己烷可溶物(HS)中含有丰富的脂肪结构,在炭化过程中过高比率的HS不利于大尺寸中间相的生成,但是适量的组分HS在炭化过程中可以调节体系黏度,维持体系足够长时间的低黏度,保证中间相可以充分的生长和发育;甲苯不溶物(TI)主要为高聚合度的稠环芳烃,可以加速中间相小球体的生成和发育,但是过量的TI组分会导致镶嵌型结构的生成,降低针状焦的品质;正己烷不溶-甲苯可溶物(HI-TS)炭化得到的生焦具有最优的光学各向异性结构,是最适宜作为针状焦原料的组分。组成为HS≈25%、HI-TS≈69%、TI≈3%−8%的精制沥青炭化后可制备出中间相结构发育良好、热膨胀系数较低的针状焦。
  • 图  1  炭化反应装置示意图

    Figure  1.  Schematic diagram of carbonization reaction device

    图  2  CTP和萃取组分的红外光谱谱图

    Figure  2.  FT-IR spectra of CTP and extracted components

    图  3  CTP和萃取组分的1H-NMR谱图

    Figure  3.  1H-NMR spectra of CTP and extracted components

    (a): CTP; (b): HS; (c): HI-TS; (d) TI

    图  4  精制沥青和萃取组分的生焦偏光显微图

    Figure  4.  Green coke polarizing micrographs of refined pitch and extracted components

    (a): CTP; (b): HS; (c): TI; (d): TS; (e): HI

    图  5  混配沥青的生焦偏光显微结构图

    Figure  5.  Green coke polarizing micrographs of mixed pitches

    (a): HS-1; (b): HS-2; (c): HS-3; (d): HS-4

    图  6  混配沥青的生焦偏光显微结构图

    Figure  6.  Green coke polarizing micrographs of mixed pitches

    (a): TI-1; (b): TI-2; (c): TI-3; (d): TI-4

    图  7  混配沥青的生焦偏光显微结构图

    Figure  7.  Green coke polarizing micrographs of mixed pitches

    (a): HI-TS-1; (b): HI-TS-2; (c): HI-TS-3; (d): HI-TS-4

    图  8  混配沥青的生焦偏光显微结构图

    Figure  8.  Green coke polarizing micrographs of mixed pitches

    (a): HS-2; (b): TI-1; (c): HI-TS-3

    图  9  针状焦的扫描电镜图

    Figure  9.  SEM micrographs of needle coke

    (a): NC-HS-2; (b): NC-HI-TS-3; (c): NC-TI-1

    表  1  原料煤焦油沥青RCTP和精制沥青CTP的基本分析

    Table  1.   Basic analysis of raw coal tar pitch RCTP and refined pitch CTP

    SampleC/%H/%C/HSoftening point/℃HS/%HI-TS/%TI-QS/%QI/%
    RCTP92.964.291.8178.521.5162.6412.872.98
    CTP92.754.821.6072.424.5865.819.560.05
    下载: 导出CSV

    表  2  CTP和萃取组分的氢分布

    Table  2.   Hydrogen distributions of CTP and extracted components

    SampleHar%Hα%Hβ/%Hγ/%
    CTP81.899.535.563.03
    HS54.6027.1215.622.67
    HI-TS81.767.407.023.79
    HI89.753.494.422.34
    下载: 导出CSV

    表  3  各向异性结构划分标准

    Table  3.   Classification of anisotropic texture

    Anisotropic TextureAbbreviationSize/μm
    Spherical unitmosaicMdia. < 60
    domainDdia. > 60
    Elongated unitshort flowSFl <300, w <60
    long flowLFl >300, w <60
    flow domainFDl >300, w >60
    下载: 导出CSV

    表  4  煅后焦的CTE值

    Table  4.   CTE value of calcined cokes

    SampleCTE/(×10−6·℃−1)SampleCTE/(×10−6·℃−1)SampleCTE/(×10−6·℃−1)
    NC-HS-11.32NC-TI-11.15NC-HI-TS-11.58
    NC-HS-21.13NC-TI-21.18NC-HI-TS-21.53
    NC-HS-31.45NC-TI-31.48NC-HI-TS-31.46
    NC-HS-41.48NC-TI-41.65NC-HI-TS-41.67
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-08-28
  • 录用日期:  2020-01-01
  • 修回日期:  2020-10-05
  • 刊出日期:  2021-02-08

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