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CO2强化水洗对生物炭脱灰影响及作用机理研究

张硕 班延鹏 闻育新 朱家龙 王一鸣 胡浩权 靳立军

张硕, 班延鹏, 闻育新, 朱家龙, 王一鸣, 胡浩权, 靳立军. CO2强化水洗对生物炭脱灰影响及作用机理研究[J]. 燃料化学学报. doi: 10.1016/S1872-5813(22)60059-8
引用本文: 张硕, 班延鹏, 闻育新, 朱家龙, 王一鸣, 胡浩权, 靳立军. CO2强化水洗对生物炭脱灰影响及作用机理研究[J]. 燃料化学学报. doi: 10.1016/S1872-5813(22)60059-8
ZHANG Shuo, BAN Yan-peng, WEN Yu-xin, ZHU Jia-long, WANG Yi-ming, HU Hao-quan, JIN Li-jun. Study on the removal and mechanism of biochar ash by CO2-enhanced water leaching[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(22)60059-8
Citation: ZHANG Shuo, BAN Yan-peng, WEN Yu-xin, ZHU Jia-long, WANG Yi-ming, HU Hao-quan, JIN Li-jun. Study on the removal and mechanism of biochar ash by CO2-enhanced water leaching[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(22)60059-8

CO2强化水洗对生物炭脱灰影响及作用机理研究

doi: 10.1016/S1872-5813(22)60059-8
基金项目: 国家自然科学基金(21878044)和中央高校基本科研业务费(DUT21TD103)资助
详细信息
    通讯作者:

    Tel: 0411-84986160, E-mail: ljin@dlut.edu.cn

  • 中图分类号: TK6

Study on the removal and mechanism of biochar ash by CO2-enhanced water leaching

Funds: The project was supported by the National Natural Science Foundation of China (21878044) and the Fundamental Research Funds for the Central Universities (DUT21TD103)
  • 摘要: 本实验提出一种先炭化后CO2强化水洗的脱灰方法,选用甘蔗渣考察了生物炭的制备温度、CO2强化水洗温度及时间对脱灰效果的影响。结果表明,炭化温度升高,脱灰率呈先增加后降低的趋势,而水洗温度升高和时间的延长则趋势相反,对于300 ℃甘蔗渣炭,经40 ℃水洗4 h脱灰率可达57%。与炭化前水洗脱灰相比,先炭化后脱灰使甘蔗渣热解炭的固定碳含量和炭收率分别提高7%和3%。分析认为,在脱灰过程中,CO2通入水中扩散溶解形成碳酸,与部分盐反应形成溶于水的盐类,K、Na和Ca脱除率超过50%,部分方解石、白云石被脱除。该过程较单独水洗显示出较高的脱灰率和普适性,但是脱灰率与生物炭的灰分组成和类型相关,对花生壳、杨木热解炭脱灰率均超过30%。
  • 图  1  甘蔗渣的TG-DTG失重曲线

    Figure  1  TG-DTG curves of bagasse sample

    图  2  炭化温度对灰含量及CO2强化水洗脱灰性能的影响

    Figure  2  Effect of carbonization temperature on ash content and CO2-enhanced water leaching

    图  3  炭化温度对脱灰率及炭收率的影响

    Figure  3  Effect of carbonization temperature on deashing rate and char yield

    图  4  CO2强化水洗脱灰温度对脱灰率及炭收率的影响

    Figure  4  Effect of CO2-enhanced water leaching temperature on deashing rate and char yield

    图  5  CO2强化水洗时间对脱灰率及炭收率的影响

    Figure  5  Effect of CO2-enhanced water leaching time on deashing rate and char yield

    图  6  300 ℃蔗渣半焦灰样脱灰前后的灰成分组成分析及脱除率

    Figure  6  Ash composition analysis in char from bagasse pyrolysis at 300 ℃ before and after CO2-enhanced deashing

    图  7  300 ℃甘蔗渣生物炭灰样脱灰前后的XRD谱图

    Figure  7  XRD patterns of BGC-A and BGC-CO2-A at 300 ℃

    图  8  不同生物炭脱灰前后灰分含量变化

    Figure  8  Ash content of before and after deashing of different biomass char

    表  1  生物质原样的工业分析和元素分析

    Table  1  Proximate and ultimate analyses of raw biomass

    SampleProximate analysis w/%Ultimate analysis wdaf/%
    MadAdVdafCHNSO*
    BG2.712.3680.6152.066.590.950.1240.28
    PS2.802.1880.4050.485.931.7941.80
    RS4.2412.4279.3143.036.162.3948.42
    PP1.3610.4783.8546.285.750.9047.06
    ad:air dry basis;d:dry basis;daf:dry ash-free basis; *:by difference;−:no detected
    下载: 导出CSV

    表  2  甘蔗渣主要元素及限量元素XRF分析

    Table  2  XRF analysis of main and limited elements in bagasse

    ElementSiCaKFeMgAlNiMnNaTi
    Content w/%24.329.447.816.663.332.080.650.310.230.18
    ElementBaZnCrCuPbBa
    Content w/%0.0820.0640.0340.0290.0280.082
    下载: 导出CSV

    表  3  300 ℃与500 ℃热解甘蔗渣炭的孔结构性质

    Table  3  Structure and properties of bagasse biochar obtained at 300 ℃ and 500 ℃

    SampleSBET>/
    (m2·g−1)
    vt /
    (cm3·g−1)
    dave/
    nm
    BGC-3003.30.01910.64
    BGC-500228.00.1404.56
    下载: 导出CSV

    表  4  炭化处理对有机质固定及脱灰效率的影响

    Table  4  Effect of carbonization treatment on fixation of organic matter and deashing efficiency

    SampleProximate analysis w/%Deashing rate/char yield /%
    MadAdVdafFCa,adΦδ1δ2η
    BGC-CO20.852.9149.4148.7056.9738.0486.3632.85
    BG-CO2-C1.323.5753.7941.3224.7534.3785.8229.50
    下载: 导出CSV

    表  5  不同生物质炭化、脱灰处理收率

    Table  5  Summary of yield of carbonization and deashing of different biomass

    Yield
    /%
    BGPSRSPP
    δ138.0447.9656.0549.96
    δ286.3685.1482.8382.98
    η32.8540.8346.4341.46
    下载: 导出CSV
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  • 收稿日期:  2022-05-19
  • 录用日期:  2022-07-14
  • 修回日期:  2022-06-28
  • 网络出版日期:  2022-09-08

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