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烟煤/半焦在循环流化床内混燃时的NO排放特性研究

刘炎泉 郭鹏鹏 谭文轶 梁绍华 潘效军

刘炎泉, 郭鹏鹏, 谭文轶, 梁绍华, 潘效军. 烟煤/半焦在循环流化床内混燃时的NO排放特性研究[J]. 燃料化学学报(中英文), 2022, 50(9): 1134-1140. doi: 10.19906/j.cnki.JFCT.2022023
引用本文: 刘炎泉, 郭鹏鹏, 谭文轶, 梁绍华, 潘效军. 烟煤/半焦在循环流化床内混燃时的NO排放特性研究[J]. 燃料化学学报(中英文), 2022, 50(9): 1134-1140. doi: 10.19906/j.cnki.JFCT.2022023
LIU Yan-quan, GUO Peng-peng, TAN Wen-yi, LIANG Shao-hua, PAN Xiao-jun. Research on the NO emission characteristics during the combustion of bituminous coal/semi-coke blends in a circulating fluidized bed[J]. Journal of Fuel Chemistry and Technology, 2022, 50(9): 1134-1140. doi: 10.19906/j.cnki.JFCT.2022023
Citation: LIU Yan-quan, GUO Peng-peng, TAN Wen-yi, LIANG Shao-hua, PAN Xiao-jun. Research on the NO emission characteristics during the combustion of bituminous coal/semi-coke blends in a circulating fluidized bed[J]. Journal of Fuel Chemistry and Technology, 2022, 50(9): 1134-1140. doi: 10.19906/j.cnki.JFCT.2022023

烟煤/半焦在循环流化床内混燃时的NO排放特性研究

doi: 10.19906/j.cnki.JFCT.2022023
基金项目: 南京工程学院高层次引进人才科研启动基金(YKJ201914),江苏省高等学校大学生创新创业训练计划项目(202111276026Z)和国家自然科学基金(51678291)资助
详细信息
    通讯作者:

    Tel: 0571-86118355, E-mail: lyqlxx@njit.edu.cn

  • 中图分类号: TQ534.9

Research on the NO emission characteristics during the combustion of bituminous coal/semi-coke blends in a circulating fluidized bed

Funds: The project was supported by the Scientific Research Startup Foundation of High-level Introduction Talents of Nanjing Institute of Technology (YKJ201914), Jiangsu Students’ Innovation and Entrepreneurship Training Program (202111276026Z), and National Natural Science Foundation (51678291)
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  • 摘要: 采用电加热循环流化床实验台研究烟煤/半焦混合燃料的NO排放特性,同时为了加深理解,对燃料中N的分布及赋存形式也进行了分析。研究结果表明,神华烟煤中挥发分N和焦炭N的占比分别为53.85%和46.15%,而半焦以焦炭N为主。在燃烧过程中,挥发分N快速析出,并且容易在密相区还原,而焦炭N释放较慢,因而半焦的NO排放明显高于烟煤。在半焦中掺烧烟煤,NO排放量会随其掺烧比的增加而减少,并且燃料之间的交互作用对NO的排放也能起到抑制作用。半焦和烟煤的NO排放量随燃烧温度呈现不同的变化趋势,当半焦中掺烧40%和80%的烟煤时,其排放量随燃烧温度升高而增加。另外,烟煤、半焦及混合燃料的NO排放量随过量空气系数和一次风率的升高也会增加。
  • FIG. 1875.  FIG. 1875.

    FIG. 1875.  FIG. 1875.

    图  1  循环流化床实验系统示意图

    Figure  1  Schematic of circulating fluidized bed

    图  2  烟煤和半焦中氮的分布

    Figure  2  Nitrogen distribution in samples

    图  3  XPS(N 1s)谱图及分峰拟合曲线

    Figure  3  X-ray photoelectron spectroscopy (N 1s) and peak fitting curves

    图  4  炉内烟气温度的分布

    Figure  4  Temperature profiles along the furnace

    图  5  CO质量浓度与烟煤掺混比之间的关系

    Figure  5  Relationship between CO emission and bituminous coal blending ratio

    图  6  NO排放与烟煤掺混比之间的关系

    Figure  6  Relationship between NO emission and BC blending ratio

    tmax = (882 ± 6) ℃,α = 1.4,λ = 0.6)

    图  7  NO排放与燃烧温度之间的关系

    Figure  7  Relationship between NO emission and combustion temperature (α=1.4,λ=0.6)

    图  8  NO排放与过量空气系数之间的关系

    Figure  8  Relationship between NO emission and excessive air coefficient

    tmax = (880 ± 7) ℃,λ = 0.6)

    图  9  NO排放与一次风率之间的关系

    Figure  9  Relationship between NO emission and primary air ratio

    tmax = (880 ± 7) ℃,α = 1.4)

    表  1  样品的工业分析与元素分析

    Table  1  Proximate and ultimate analysis results of samples

    SampleProximate analysis wad/%Ultimate analysis wad/%
    MAVFCCHONS
    BC 10.60 15.22 28.46 45.72 57.82 4.28 9.43 0.79 1.87
    SC 4.96 10.41 10.50 74.13 74.81 0.91 7.85 0.79 0.27
    下载: 导出CSV

    表  2  煤中不同含N官能团的结合能大小

    Table  2  Binding energy of nitrogen functionalities in coals

    Nitrogen functionalitiesSymbolBinding energy/eV
    Pyridinic-NN-6398.7±0.4
    Pyrrolic-NN-5400.5±0.3
    Quaternary-NN-Q401.5±0.3
    N-oxideN-X403.5±0.3
    下载: 导出CSV

    表  3  样品中不同含N官能团的相对含量

    Table  3  Relative content of nitrogen functionalities in samples

    SampleN-6N-5N-QN-X
    BC47.8051.430.76
    SC6.4693.54
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-03-07
  • 修回日期:  2022-03-23
  • 网络出版日期:  2022-04-15
  • 刊出日期:  2022-10-21

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