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高温气化条件下Na2O对煤灰中矿物质演化行为的影响

陈晓东 孔令学 白进 白宗庆 李文

陈晓东, 孔令学, 白进, 白宗庆, 李文. 高温气化条件下Na2O对煤灰中矿物质演化行为的影响[J]. 燃料化学学报, 2016, 44(3): 263-272.
引用本文: 陈晓东, 孔令学, 白进, 白宗庆, 李文. 高温气化条件下Na2O对煤灰中矿物质演化行为的影响[J]. 燃料化学学报, 2016, 44(3): 263-272.
CHEN Xiao-dong, KONG Ling-xue, BAI Jin, BAI Zong-qing, LI Wen. Effect of Na2O on mineral transformation of coal ash under high temperature gasification condition[J]. Journal of Fuel Chemistry and Technology, 2016, 44(3): 263-272.
Citation: CHEN Xiao-dong, KONG Ling-xue, BAI Jin, BAI Zong-qing, LI Wen. Effect of Na2O on mineral transformation of coal ash under high temperature gasification condition[J]. Journal of Fuel Chemistry and Technology, 2016, 44(3): 263-272.

高温气化条件下Na2O对煤灰中矿物质演化行为的影响

基金项目: 

国家自然科学基金 21406254

国家自然科学基金 21476247

山西省青年科技研究基金 2015021055

国家自然科学基金委员(UNFS)-山西煤基低碳联合基金 U1510201

详细信息
    通讯作者:

    白进, Tel: 0351-4040289, Fax: 0351-4050320, E-mail: stone@sxicc.ac.cn

  • 中图分类号: TQ53

Effect of Na2O on mineral transformation of coal ash under high temperature gasification condition

Funds: 

The project was supported by the National Natural Science Foundation of China 21406254

The project was supported by the National Natural Science Foundation of China 21476247

Shanxi Province Science Foundation for Youths 2015021055

and Joint Foundation of Natural Science Foundation of China and Shanxi Province U1510201

  • 摘要: 利用XRD和FT-IR考察了高温弱还原气氛下Na2O对两种硅铝含量不同的煤灰中矿物质组成的影响, 揭示了Na2O影响煤灰熔融特性的本质.通过FactSage计算了高温下矿物质反应的ΔG, 探讨了Na2O影响煤灰中矿物质组成的机理.结果表明, Na2O对煤灰矿物质组成的影响与原煤灰的硅铝含量密切相关.硅铝总含量82.89%的煤灰, Na2O含量为5%-20%时, 钠长石和霞石的生成是煤灰熔融温度降低的主要原因; 当Na2O含量大于20%时, 导致煤灰熔融温度降低的原因是霞石的生成.硅铝总含量47.85%的煤灰, Na2O含量小于10%时, 没有含钠矿物质生成; 当Na2O含量大于10%时, 主要生成菱硅钙钠石、青金石和含钠的硅铝酸盐矿物, 导致煤灰熔融温度降低.FactSage计算表明生成含Na矿物质反应的ΔG较小, 其在高温下更容易发生.
  • 图  1  煤灰熔融特征温度随Na2O含量的变化

    Figure  1  Ash fusion temperatures vs Na2O contents

    (a): SH; (b): ZD

    图  2  不同Na2O含量时寺河煤灰在不同温度下的XRD谱图

    Figure  2  XRD patterns of SH coal ash with different Na2O content at different temperatures

    (a): raw ash; (b): 5% Na2O; (c): 10% Na2O; (d): 20% Na2O
    1: quartz; 2: mullite; 3: anorthite; 4: illite; 5: albite; 6: corundum; 7: nepheline; 8: cordierite; 9: carnegieite

    图  3  1 100 ℃时不同Na2O含量SH煤灰的FT-IR谱图

    Figure  3  FT-IR patterns of mineral matters in SH coal ash with different Na2O contents at 1 100 ℃

    a: raw ash; b: 5% Na2O; c: 10% Na2O; d: 20% Na2O

    图  4  不同Na2O含量时准东煤灰在不同温度下的XRD谱图

    Figure  4  XRD patterns of ZD coal ash with different Na2O content at different temperatures

    (a): raw ash; (b): 5% Na2O; (c): 10% Na2O; (d): 20% Na2O
    1: quartz; 2: lime; 3: anhydrite; 4: hematite; 5: oldhamite; 6: wollastonite; 7: iron sulfide; 8: gehlenite; 9: combeite; 10: lazurite; 11: sodium aluminium oxide

    图  5  1 000 ℃时不同Na2O含量ZD煤灰的FT-IR谱图

    Figure  5  FT-IR patterns of mineral matters in ZD coal ash with different Na2O contents at 1 000 ℃

    a: raw ash; b: 5% Na2O; c: 10% Na2O; d: 20% Na2O

    图  6  FactSage计算不同Na2O含量寺河煤灰高温下的矿物质组成

    Figure  6  FactSage calculation of SH coal ashes with different Na2O contents at high temperatures

    图  7  FactSage计算不同Na2O含量准东煤灰高温下矿物质的组成

    Figure  7  FactSage calculation of ZD coal ashes with varying Na2O contents at high temperatures

    表  1  煤样的工业分析和元素分析

    Table  1  Proximate and ultimate analysis of coals

    SampleProximate analysis wad/%Ultimate analysis wdaf/%
    MAVFCCHO*NSt
    SH2.1718.525.5473.7786.923.018.591.060.42
    ZD12.101.4421.1365.3381.153.4214.370.820.24
    *: by difference; St: total sulfur
    下载: 导出CSV

    表  2  煤样的灰成分分析

    Table  2  Chemical compositions of coal ashes

    SampleContent w/%
    SiO2Al2O3Fe2O3CaOMgOSO3K2ONa2O
    SH49.5433.353.365.201.111.281.301.28
    ZD35.1012.7519.3817.144.384.890.792.42
    下载: 导出CSV

    表  3  煤灰的灰熔点

    Table  3  AFTs of coal samples

    SampleTemperature t/℃
    DTSTHTFT
    SH1 3801 4521 5231 532
    ZD1 1641 1851 1881 193
    DT: deformation temperature; ST: sphere temperature; HT: hemisphere temperature; FT: flow temperature
    下载: 导出CSV

    表  4  高温下煤灰中矿物质反应的吉布斯自由能

    Table  4  Gibbs free energy of reactions among minerals at high temperature

    ReactionΔG /kJ
    1 000 ℃1 100 ℃1 200 ℃1 300 ℃
    3Al2O3+2SiO2→3Al2O3·2SiO2(mullite)-15.40-18.06-20.70-23.33
    CaO+ Al2O3+2SiO2→CaAl2Si2O8(anorthite)-131.64-133.60-135.62-137.71
    CaO+SiO2→CaSiO3(wollastonite)-88.57-88.34-88.01-87.62
    SiO2+Al2O3+2CaO→Ca2Al2SiO7(gehlenite)-163.84-166.55-169.36-172.23
    Na2O+ Al2O3+6SiO2→2NaAlSi3O8(albite)-395.71-397.51-396.89-395.08
    Na2O+Al2O3+2SiO2→2NaAlSiO4(nepheline)-356.37-357.60-356.45-354.80
    Na2O+2CaO+3SiO2→Na2Ca2Si3O9(combeite)-442.00-433.16-421.93-409.52
    下载: 导出CSV
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