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灰分中碱和碱土金属对生物质快速热解生物油组分的影响

丁紫霞 蔡博 岑珂慧 陈登宇 马中青

丁紫霞, 蔡博, 岑珂慧, 陈登宇, 马中青. 灰分中碱和碱土金属对生物质快速热解生物油组分的影响[J]. 燃料化学学报(中英文). doi: 10.19906/j.cnki.JFCT.2023076
引用本文: 丁紫霞, 蔡博, 岑珂慧, 陈登宇, 马中青. 灰分中碱和碱土金属对生物质快速热解生物油组分的影响[J]. 燃料化学学报(中英文). doi: 10.19906/j.cnki.JFCT.2023076
DING Zixia, CAI Bo, CEN Kehui, CHEN Dengyu, MA Zhongqing. The effect of alkali and alkaline earth metals in biomass ash on the bio-oil components derived from biomass fast pyrolysis[J]. Journal of Fuel Chemistry and Technology. doi: 10.19906/j.cnki.JFCT.2023076
Citation: DING Zixia, CAI Bo, CEN Kehui, CHEN Dengyu, MA Zhongqing. The effect of alkali and alkaline earth metals in biomass ash on the bio-oil components derived from biomass fast pyrolysis[J]. Journal of Fuel Chemistry and Technology. doi: 10.19906/j.cnki.JFCT.2023076

灰分中碱和碱土金属对生物质快速热解生物油组分的影响

doi: 10.19906/j.cnki.JFCT.2023076
基金项目: 国家自然科学基金(52376214, 52076112),浙江省自然科学基金(LY21E060001)和浙江省 “领雁”研发攻关计划(2022C03092)资助
详细信息
    通讯作者:

    E-mail: chendy@njfu.edu.cn

    mazq@zafu.edu.cn

  • 中图分类号: TK6

The effect of alkali and alkaline earth metals in biomass ash on the bio-oil components derived from biomass fast pyrolysis

Funds: The project was supported by the National Natural Science Foundation of China (52376214, 52076112), the Natural Science Foundation of Zhejiang Province (LY21E060001), the Key R & D Program of Zhejiang Province (2022C03092).
  • 摘要: 生物质灰分中的碱和碱土金属(AAEMs)对快速热解生物油的产率和组分分布具有显著影响。本研究选取玉米秸秆为原料,研究梯级脱灰预处理(蒸馏水、醋酸铵和盐酸)对AAEMs的选择性脱除及其生物油组分的影响,研究了碱和碱土金属类别(K、Ca、Na和Mg)、盐浓度(0.5%、2.5%、5%)和不同钾盐的酸根(${\rm{SO}}_{4}^{{2-}} $${\rm{NO}}_{3}^{-} $${\rm{CO}}_{3}^{{2-}} $${\rm{HCO}}_{3}^{-} $、AC${\rm{PO}}_{4}^{{{3-}}}$)对生物油组分的影响。结果表明,在梯级脱灰预处理过程中,随着脱灰溶液酸性程度加深,AAEMs的脱除率逐渐上升,根据AAEMs在梯级脱灰过程中的选择性脱除规律,可将其在生物质中的赋存形态分为水溶性(K)、离子交换性(Ca和Mg)和酸溶性(Na)等形态。经过碱和碱土金属盐浸渍后,AAEMs将起到催化剂的作用,促进热解中间产物左旋葡聚糖的二次降解,导致其相对含量显著降低,形成更多的呋喃和酮类等轻质含氧化合物,导致2, 3-二氢苯并呋喃、酮类和长链烷烃等组分的含量显著增加。不同钾盐酸根离子对脱水糖的二次裂解反应及木质素芳基醚键和酚羟基的裂解反应具有较大的影响,根据酸根的酸性强弱,对脱水糖裂解反应的影响大小顺序为${\rm{HCO}}_{3}^{-} $>${\rm{CO}}_{3}^{{{2-}}}$>AC>${\rm{PO}}_{4}^{{{3-}}}$>Cl>${\rm{NO}}_{3}^{-} $>${\rm{SO}}_{4}^{{{2-}}}$,而对木质素芳基醚键和酚羟基的裂解反应影响大小顺序为${\rm{CO}}_{3}^{{{2-}}}$>Cl>${\rm{HCO}}_{3}^{-} $>${\rm{PO}}_{4}^{{{3-}}}$≈AC>${\rm{SO}}_{4}^{{{2-}}}$${\rm{NO}}_{3}^{-} $
  • 图  1  生物质梯级脱灰预处理工艺流程

    Figure  1  Stepwise demineralization process of biomass

    图  2  梯级脱灰预处理对热解生物油组分的影响

    Figure  2  Effect of stepwise demineralization pretreatment on the components of bio-oil

    图  3  氯化盐种类和浓度对脱灰后生物质热解生物油组分的影响

    Figure  3  Effect of types of chloride salt and concentration on the components of bio-oil derived from pyrolysis of acid-washed biomass

    图  4  钾金属盐的酸根对热解生物油组分的影响

    Figure  4  Effect of acid roots of K salt on the components of bio-oil

    图  5  碱和碱土金属对生物质热解的影响机制

    Figure  5  Effect of AAEMs on the pyrolysis mechanism of biomass

    表  1  原料及梯级脱灰预处理样品的元素分析和工业分析

    Table  1  Ultimate and proximate analysis of raw and pretreated biomass

    SampleUltimate analysis wdaf/% Proximate analysis wdb/%
    CHOSNAVFC
    CS-raw45.426.1847.810.090.60 3.3977.5819.03
    CS-H2O46.346.3146.980.020.352.3882.3015.32
    CS-NH4AC46.366.2847.040.030.291.7385.2113.06
    CS-HCl46.336.2447.150.070.211.7086.5411.76
    下载: 导出CSV

    表  2  原料及梯级脱灰预处理样品的碱和碱土金属质量分数

    Table  2  Contents of AAEMs in raw and stepwise demineralization pretreated biomass

    SampleContents of AAEMs/(μg·g−1) Removal rates of AAEMs after each washing step/%
    KNaCaMgKNaCaMg
    CS-raw7375.47417.06663.03789.85
    CS-H2O1486.73376.00397.81393.8979.849.8540.0050.13
    CS-NH4AC49.77340.6685.4238.5219.488.4747.1244.99
    CS-HCl14.48349.932.6011.540.480.0012.493.42
    下载: 导出CSV
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  • 收稿日期:  2023-09-11
  • 修回日期:  2023-10-04
  • 录用日期:  2023-10-19
  • 网络出版日期:  2023-10-31

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