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典型城市生活垃圾一次性竹筷子水热炭结构与气化反应特性关联机制研究

周智超 王焦飞 白永辉 吕鹏 宋旭东 苏暐光 于广锁 丁路

周智超, 王焦飞, 白永辉, 吕鹏, 宋旭东, 苏暐光, 于广锁, 丁路. 典型城市生活垃圾一次性竹筷子水热炭结构与气化反应特性关联机制研究[J]. 燃料化学学报. doi: 10.19906/j.cnki.JFCT.2022084
引用本文: 周智超, 王焦飞, 白永辉, 吕鹏, 宋旭东, 苏暐光, 于广锁, 丁路. 典型城市生活垃圾一次性竹筷子水热炭结构与气化反应特性关联机制研究[J]. 燃料化学学报. doi: 10.19906/j.cnki.JFCT.2022084
ZHOU Zhi-chao, WANG Jiao-fei, BAI Yong-hui, LÜ Peng, SONG Xu-dong, SU Wei-guang, YU Guang-suo, DING Lu. Correlation mechanism between structure and gasification characteristics of typical municipal solid waste (MSW) disposable bamboo chopsticks hydrochar[J]. Journal of Fuel Chemistry and Technology. doi: 10.19906/j.cnki.JFCT.2022084
Citation: ZHOU Zhi-chao, WANG Jiao-fei, BAI Yong-hui, LÜ Peng, SONG Xu-dong, SU Wei-guang, YU Guang-suo, DING Lu. Correlation mechanism between structure and gasification characteristics of typical municipal solid waste (MSW) disposable bamboo chopsticks hydrochar[J]. Journal of Fuel Chemistry and Technology. doi: 10.19906/j.cnki.JFCT.2022084

典型城市生活垃圾一次性竹筷子水热炭结构与气化反应特性关联机制研究

doi: 10.19906/j.cnki.JFCT.2022084
基金项目: 国家重点研发计划(2021YFE0108900)资助
详细信息
    通讯作者:

    Tel: 0951-2062061, E-mail: wjfdafei@nxu.edu.cn

    yhbai@nxu.edu.cn

  • 中图分类号: TQ546.1

Correlation mechanism between structure and gasification characteristics of typical municipal solid waste (MSW) disposable bamboo chopsticks hydrochar

Funds: The project was supported by National Key Research and Development Plan(2021YFE0108900)
  • 摘要: 由于城市生活垃圾(MSW)成分复杂、物料特性波动大、能量密度低,导致对其水热炭的气化特性认识不足,研究单一成分的水热炭气化特性具有重要意义。本文以MSW的典型成分一次性竹筷子(DBC)为原料,研究水热炭化(HTC)条件对DBC水热炭结构性质与气化反应特性的影响规律。结果表明,HTC提高了DBC的能量品质,水热处理后DBC-230-60的高位热值(HHV)是DBC的1.62倍,H/C和O/C从DBC的1.57和0.76下降到DBC-230-60的1和0.33。表征发现水热炭和水热炭半焦的芳构化程度比DBC原样更高,水热炭的比表面积要低于DBC原样,但水热炭半焦的比表面积却要高于DBC原样半焦。相比于水热时间,水热温度对水热炭结构和气化反应性的影响更加显著。更高的水热温度增大了水热炭的芳构化程度,降低了水热炭的气化反应性。水热炭的气化反应性要比DBC原样更差,主要是因为水热炭半焦芳构化程度增大对气化反应性的消极作用大于孔隙结构丰富的促进作用。
  • 图  1  (a)不同水热温度(120、150、180、200、230 ℃),水热时间为60 min条件下水热炭的收率曲线;(b)不同水热时间(30、60、90 min),水热温度为200 ℃条件下水热炭的收率曲线

    Figure  1  (a) Yield curves of hydrochar under different hydrothermal temperatures (120, 150, 180, 200, 230 ℃) and hydrothermal time of 60 min; (b) Yield curves of hydrochar at 200 ℃ for different hydrothermal time (30, 60, 90 min)

    图  2  不同工艺条件水热炭的宏观表面图

    Figure  2  Macroscopic surface diagram of hydrochar

    图  3  不同工艺条件水热炭的范式原子比例图

    Figure  3  Van Krevelen diagram of hydrochar with different process conditions

    图  4  不同工艺条件水热炭的红外曲线

    Figure  4  FT-IR curve of hydrochar with different process conditions

    图  5  不同工艺条件水热炭的XRD曲线

    Figure  5  XRD curves of hydrochar with different process conditions

    图  6  不同工艺条件水热炭的拉曼曲线

    Figure  6  Raman curves of hydrochar with different process conditions

    图  7  不同工艺条件水热炭拉曼峰的面积比

    Figure  7  Area ratio of Raman peak of hydrochar with different process conditions

    图  8  不同工艺条件水热炭的TG(a)、DTG(b)曲线

    Figure  8  TG(A) and DTG(B) curves of hydrochar under different process conditions

    图  9  CO2气氛下水热炭在900 ℃的炭转化率曲线

    Figure  9  Carbon conversion curve of hydrochar in CO2 atmosphere at 900 ℃

    图  10  不同工艺条件水热炭热解半焦的红外曲线

    Figure  10  FT-IR curves of pyrolysis semi-coke of hydrochar under different process conditions

    图  11  DBC-900、DBC-120-60-900、DBC-230-60-900半焦的扫描电镜图。(a, c, e)为三个样品在1K放大倍率下的扫描电镜图;(b, d, f)为三个样品在10K放大倍率下的扫描电镜图。

    Figure  11  SEM images of DBC-900, DBC-120-60-900, DBC-230-60-900 pyrolysis semi-coke. (a, c, e) are SEM images of three samples at 1 K magnification; (b, d, f) are SEM images of three samples at 10 K magnification

    图  12  不同工艺条件水热炭热解半焦比表面积与气化平均转化速率关系曲线

    Figure  12  Relationship between specific surface area and average gasification conversion rate of pyrolysis semi-coke of hydrochar under different process conditions

    图  13  不同工艺条件水热炭热解半焦拉曼峰面积比与气化平均转化速率关系曲线

    Figure  13  Relationship between Raman peak area ratio and average gasification conversion rate of pyrolysis semi-coke of hydrochar under different process conditions

    表  1  DBC的基本性质

    Table  1  Basic properties of DBC

    SampleUltimate analysis wd/%Proximate analysis wd/%Atomic ratioHHV(MJ/kg)
    CHONSAVFCO/CH/C
    DBC45.856.0146.430.60.360.7585.4813.760.761.5714.63
    下载: 导出CSV

    表  2  水热炭制备的工况参数

    Table  2  Operating parameters of hydrochar preparation

    SampleHydrothermal temperature (℃)Hydrothermal time (time)Stirring speed (r/min)Heating rate (℃/min)Solid-liquid ratio
    DBC-120-601206015031∶10
    DBC-180-601806015031∶10
    DBC-200-302003015031∶10
    DBC-200-602006015031∶10
    DBC-200-902009015031∶10
    DBC-230-602306015031∶10
    下载: 导出CSV

    表  3  DBC水热炭的元素分析、原子比和C回收率

    Table  3  Elemental analysis, atomic ratio and C recovery of DBC hydrocar

    SampleUltimate analysis wd/% Atomic ratioC recovery rate/%
    CHONSO/CH/C
    DBC45.856.0146.430.600.360.761.57100.00
    DBC-120-6048.416.1044.920.460.080.721.5182.55
    DBC-180-6052.296.1041.030.540.020.591.4065.86
    DBC-200-3052.985.8640.590.540.020.581.3366.12
    DBC-200-6054.795.8538.760.580.010.531.2867.41
    DBC-200-9053.905.9639.510.580.040.551.3267.97
    DBC-230-6065.255.4328.640.670.000.331.0060.68
    下载: 导出CSV

    表  4  DBC水热炭的工业分析、热值、能量密度和能量回收率

    Table  4  Industrial analysis, HHV, energy density and energy recovery of DBC hydrochar

    SampleProximate analysis wd/% Atomic ratioHHV(MJ/kg)ED/%ERE/%
    AVFCO/CH/C
    DBC0.7585.4813.76 0.761.5714.63100.00100.00
    DBC-120-600.0391.098.880.721.5115.88108.5484.86
    DBC-180-600.0287.2912.700.591.4017.90122.3565.10
    DBC-200-300.0183.6016.390.581.3317.91122.4257.25
    DBC-200-600.0181.0018.990.531.2818.85128.8459.37
    DBC-200-900.0183.0716.930.551.3218.55126.7956.90
    DBC-230-600.0165.3534.640.331.0023.70162.0054.48
    下载: 导出CSV

    表  5  XRD的结构参数

    Table  5  Structural parameters of XRD

    SampleLc/nmIπ/IγAromaticity
    DBC0.220.680.38
    DBC-180-600.502.010.60
    DBC-200-600.601.790.46
    DBC-230-600.611.980.53
    下载: 导出CSV

    表  6  水热炭的比表面积及平均孔径

    Table  6  Specific surface area and average pore size of hydrochar

    SampleSBET/(m2·g−1)Average pore size(nm)
    DBC94.1415.09
    DBC-120-6018.2839.46
    DBC-180-6013.4365.34
    DBC-200-6021.9434.56
    DBC-230-6010.9447.02
    下载: 导出CSV

    表  7  水热炭热解半焦的比表面积及平均孔径

    Table  7  Specific surface area and average pore size of pyrolysis semi-coke of hydrochar

    SampleSBET/(m2·g−1)Average pore size(nm)
    DBC-900117.802.50
    DBC-120-60-900540.601.65
    DBC-180-60-900510.711.59
    DBC-200-60-900515.291.60
    DBC-230-60-900475.741.61
    下载: 导出CSV
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  • 收稿日期:  2022-09-29
  • 录用日期:  2022-11-08
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