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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. 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. doi: 10.19906/j.cnki.JFCT.2022023
LIU Yan-quan, GUO Peng-peng, TAN Wen-yi, LIANG Shao-hua, PAN Xian-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. doi: 10.19906/j.cnki.JFCT.2022023
Citation: LIU Yan-quan, GUO Peng-peng, TAN Wen-yi, LIANG Shao-hua, PAN Xian-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. 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排放浓度明显高于烟煤。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。
  • 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

    SamplesN-6N-5N-QN-X
    BC47.8051.430.76
    SC6.4693.54
    下载: 导出CSV
  • [1] GONG Z, LIU Z, ZHOU T, LU Q, SUN Y. Combustion and NO emission of Shenmu char in a 2 MW circulating fluidized bed[J]. Energy Fuels,2015,29(2):1219−1226. doi: 10.1021/ef502768w
    [2] 杨忠灿, 王志超, 李炎, 贾晓艳. 电站煤粉锅炉掺烧兰炭试验研究[J]. 洁净煤技术,2017,48(3):31−36.

    YANG Zhong-can, WANG Zhi-chao, LI Yan, JIA Xiao-yan. Experimental research on pulverized coal power station blending with semi-coke[J]. Clean Coal Technol,2017,48(3):31−36.
    [3] YAO Y, ZHU J, LU Q. Experimental study on nitrogen transformation in combustion of pulverized semi-coke preheated in a circulating fluidized bed[J]. Energy Fuels,2015,29(6):3985−3991. doi: 10.1021/acs.energyfuels.5b00791
    [4] YAO Y, ZHU J, LU Q, ZHOU Z. Experimental study on preheated combustion of pulverized semi-coke[J]. J Therm Sci,2015,24(4):370−377. doi: 10.1007/s11630-015-0797-8
    [5] GONG Z, ZHOU T, LU Q, SUN Y. Combustion and NOx emission characteristics of shenmu char in a circulating fluidized bed with post-combustion[J]. Energy Fuels,2016,30(1):31−38. doi: 10.1021/acs.energyfuels.5b01749
    [6] SONG G, XIAO Y, YANG Z, YANG X, LYU Q. A comparative experimental study on characteristics of ultra-low NOx emission and fly ash between Fugu bituminous and its semi-coke with post-combustion[J]. Fuel Process Technol,2021,211:106618. doi: 10.1016/j.fuproc.2020.106618
    [7] SONG G, YANG X, YANG Z, XIAO Y. Experimental study on ultra-low initial NOx emission characteristics of Shenmu coal and char in a high temperature CFB with post-combustion[J]. J Energy Inst,2021,94:310−318. doi: 10.1016/j.joei.2020.09.015
    [8] SONG W, OUYANG Z, WANG M, LI S, LIU J, YU Q, LIU W, ZHU S. The combustion and NOx emission characteristics of the ultra-low volatile fuel using the novel pulverized coal self-sustained preheating combustion technology[J]. Fuel,2020,271:117592. doi: 10.1016/j.fuel.2020.117592
    [9] LV Z, XIONG X, YU S, TAN H, XIANG B, HUANG J, PENG J, LI P. Experimental investigation on NO emission of semi-coke under high temperature preheating combustion technology[J]. Fuel,2021,283:119293. doi: 10.1016/j.fuel.2020.119293
    [10] 吕钊敏, 熊小鹤, 于世林, 谭厚章, 向柏祥, 黄军. 预热燃烧模式下半焦NO排放和燃尽特性实验研究[J]. 燃料化学学报, 2020, 48(5): 543−550.

    LU Zhao-min, XIONG Xiao-he, YU Shi-lin, TAN Hou-zhang, XIANG Bai-xiang, HUANG Jun. J Fuel Chem Technol, 2020, 48(5): 543−550.
    [11] ZHANG J, JIA X, WANG C, ZHAO N, WANG P, CHE D. Experimental investigation on combustion and NO formation characteristics of semi-coke and bituminous coal blends[J]. Fuel,2019,247:87−96. doi: 10.1016/j.fuel.2019.03.045
    [12] 张锦萍, 王长安, 贾晓威, 王鹏乾, 车得福. 半焦-烟煤混燃特性及动力学分析[J]. 化工学报, 2018, 69(8): 3611−3618.

    ZHANG Jin-ping, WANG Chang-an, JIA Xiao-wei, WANG Peng-qian, CHE De-fu. J Chem Ind Eng, 2018, 69(8): 3611−3618.
    [13] WANG P, WANG C A, DU Y, FENG Q, WANG Z, YAO W, LIU J, ZHANG J, CHE D. Experiments and simulation on co-combustion of semicoke and coal in a full-scale tangentially fired utility boiler[J]. Energy Fuels,2019,33(4):3012−3027. doi: 10.1021/acs.energyfuels.8b04482
    [14] GUAN J, YU Q, SUN R, SHEN T, WANG M, YAN Y, SONG X. Experimental investigation for co-combustion characteristics of semi-coke and bituminous coal in a 3 MWth tangential combustion facility[J]. J Therm Sci,2020,29(6):1655−1662. doi: 10.1007/s11630-020-1187-4
    [15] 彭政康, 闫永宏, 孙刘涛, 朱文堃, 孙锐. 掺混比对半焦与烟煤混合燃烧及NOx排放特性影响的试验研究[J]. 动力工程学报, 2020, 40(5): 356−364.

    PENG Zheng-kang, YAN Yong-hong, SUN Liu-tao, ZHU Wen-kun, SUN Rui. J Chin Soc Power Eng, 2020, 40(5): 356−364.
    [16] YUE G, CAI R, LU J, ZHANG H. From a CFB reactor to a CFB boiler-The review of R&D progress of CFB coal combustion technology in China[J]. Powder Technol,2017,316:18−28. doi: 10.1016/j.powtec.2016.10.062
    [17] LIU X, LUO Z, YU C, JIN B, TU H. Release mechanism of fuel-N into NOx and N2O precursors during pyrolysis of rice straw[J]. Energies,2018,11(3):520. doi: 10.3390/en11030520
    [18] 巩志强. 低阶煤热解半焦的燃烧特性和NOx排放特性试验研究[D]. 中国科学院研究生院(工程热物理研究所), 2016.

    GONG Zhi-qiang. Experimental study on combustion and NOx emission characteristics of char from pyrolysis of low rank coal[D]. The university of Chinese academy of sciences (Institute of Engineering Thermophysics), 2016.
    [19] WANG P, WANG C, YUAN M, WANG C, ZHANG J, DU Y, TAO Z, CHE D. Experimental evaluation on co-combustion characteristics of semi-coke and coal under enhanced high-temperature and strong-reducing atmosphere[J]. Appl Energy,2020,260:114203. doi: 10.1016/j.apenergy.2019.114203
    [20] LI Y H, LU G Q, RUDOLPH V. The kinetics of NO and N2O reduction over coal chars in fluidised-bed combustion[J]. Chem Eng Sci,1998,53(1):1−26. doi: 10.1016/S0009-2509(97)87569-0
    [21] ZHOU H, LI Y, LI N, QIU R, CEN K. Conversions of fuel-N to NO and N2O during devolatilization and char combustion stages of a single coal particle under oxy-fuel fluidized bed conditions[J]. J Energy Inst,2019,92(2):351−363. doi: 10.1016/j.joei.2018.01.001
    [22] WANG C, ZHAO L, YUAN M, WANG C, WANG P, DU Y, CHE D. NO heterogeneous reduction on semi-coke and residual carbon with the presence of O2 and CO[J]. Fuel,2021,283:118954. doi: 10.1016/j.fuel.2020.118954
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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

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