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碱金属赋存形态对水稻秸秆热解过程的影响机制

张玉洁 王焦飞 卫俊涛 白永辉 宋旭东 苏暐光 于广锁

张玉洁, 王焦飞, 卫俊涛, 白永辉, 宋旭东, 苏暐光, 于广锁. 碱金属赋存形态对水稻秸秆热解过程的影响机制[J]. 燃料化学学报. doi: 10.1016/S1872-5813(21)60025-7
引用本文: 张玉洁, 王焦飞, 卫俊涛, 白永辉, 宋旭东, 苏暐光, 于广锁. 碱金属赋存形态对水稻秸秆热解过程的影响机制[J]. 燃料化学学报. doi: 10.1016/S1872-5813(21)60025-7
ZHANG Yu-jie, WANG Jiao-fei, WEI Jun-tao, BAI Yong-hui, SONG Xu-dong, SU Wei-guang, YU Guang-suo. The mechanism of alkali metal occurrence on the pyrolysis process of rice straw[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(21)60025-7
Citation: ZHANG Yu-jie, WANG Jiao-fei, WEI Jun-tao, BAI Yong-hui, SONG Xu-dong, SU Wei-guang, YU Guang-suo. The mechanism of alkali metal occurrence on the pyrolysis process of rice straw[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(21)60025-7

碱金属赋存形态对水稻秸秆热解过程的影响机制

doi: 10.1016/S1872-5813(21)60025-7
基金项目: 国家自然科学基金资助(21968024)、宁夏回族自治区重点研发计划重大项目(2019BCH01001)和宁夏重点研发项目(引才专项)(2019BEB04037, 2019BEB04001)资助
详细信息
    作者简介:

    张玉洁:zyj19972080@163.com

    通讯作者:

    Tel:0951-2062008,E-mail:wjfdafei@nxu.edu.cn

    gsyu@nxu.edu.cn

  • 中图分类号: TQ536.9

The mechanism of alkali metal occurrence on the pyrolysis process of rice straw

Funds: The project was supported by National Natural Science Foundation of China (21968024), Project of Key Research Plan of Ningxia(2019BCH01001) and Project of Key Research Plan of Ningxia(special talent introduction project) (2019BEB04037, 2019BEB04001)
  • 摘要: 碱金属是生物质热解过程的重要影响因素。本研究以含不同赋存形态碱金属的水稻秸秆(RS)为研究对象,采用热重-质谱联用仪(TG-MS)和热裂解-气质联用仪(Py-GC/MS)研究其热解特性、小分子气体的释放规律及原位热解焦油组成变化规律,以揭示不同赋存形态碱金属在热解过程中的作用机理。结果表明,随水稻秸秆碱金属脱除程度的提高,热解过程中小分子释放温度向高温区域偏移,碱金属对小分子逸出过程存在催化作用。而不同赋存形态的碱金属对焦油组分的影响不同。水溶性碱金属抑制了醇类物质的产生而促进酮类和醛类的生成。离子交换态碱金属在不同温度下对油品组成的影响不同,在300 ℃热解时抑制了醛类和醚类的产生,促进了酯类和酮类的生成,而热解温度高于400 ℃后则相反。动力学分析表明水溶性碱金属离子和交换态碱金属均会降低生物质热解活化能。
  • 图  1  样品制备过程

    Figure  1.  Samples preparation process

    图  2  洗涤处理前后水稻秸秆在15 ℃/min的升温速率下热解的失重和失重速率曲线

    Figure  2.  TG and DTG curves of RS before and after washing atheating rateof 15 ℃/min

    图  3  热解过程小分子气体逸出特性

    Figure  3.  Escape characteristics of small molecule gases during pyrolysis

    图  4  RS在不同温度下热解所得焦油组分的面积百分比

    Figure  4.  Area percentage of tar component produced from pyrolysis of RS at different temperatures

    图  5  RS在不同温度下热解所得焦油中各含氧化合物组分的面积百分比

    Figure  5.  Area percentage of tar oxygen-containing component produced from pyrolysis of RS at different temperatures

    图  6  水稻秸秆热解的活化能

    Figure  6.  Activation energy of rice straw pyrolysis

    表  1  水稻秸秆的工业分析和元素分析

    Table  1.   Proximate and ultimate analyses of RS

    SamplesProximate analysis wad /%Ultimate analysis wdaf /%
    MAVFCCHONS
    RS16.769.2269.1614.8744.506.2445.661.462.15
    RS27.328.3370.6813.6845.316.2543.291.623.54
    RS38.386.5574.5410.5345.296.1443.611.563.40
    RS45.969.4872.9011.6746.106.2343.711.112.85
    下载: 导出CSV

    表  2  水稻秸秆的灰化学组成

    Table  2.   Ash compositions of ricestraw

    SamplesCompositions w/%
    SiO2Al2O3Fe2O3CaONa2OK2OMgOOthers
    RS152.420.550.473.420.6724.563.2714.64
    下载: 导出CSV

    表  3  样品的碱金属及碱土金属元素组成

    Table  3.   Element composition of main alkali and alkaline earth metals in samples

    SamplesContent wad /%,
    KNaCaMgFe
    RS12.100.650.370.180.05
    RS20.610.030.400.080.04
    RS30.020.010.340.020.03
    RS4< 0.01< 0.01< 0.010.010.02
    下载: 导出CSV

    表  5  水稻秸秆热解的活化能

    Table  5.   Activation energy of rice straw pyrolysis

    SamplesLinear equationsEα(kJ/mol)R2
    RS1y = −21.84x + 26.62181.577760.990
    RS2y = −22.57x + 26.99187.646980.996
    RS3y = −23.22x + 26.64193.051080.984
    RS4y = −26.15x + 31.16217.411100.982
    下载: 导出CSV
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