兰炭末与生物质混配成型颗粒的共热解特性与动力学分析

张乃心; 朱虹宇; 郎林; 刘华财; 阴秀丽; 龚斌

doi:10.19912/j.0254-0096.tynxb.2023-2062

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (5) : 678-689. DOI: 10.19912/j.0254-0096.tynxb.2023-2062

兰炭末与生物质混配成型颗粒的共热解特性与动力学分析

张乃心^1,2, 朱虹宇², 郎林², 刘华财², 阴秀丽², 龚斌¹

作者信息 +

CO-PYROLYSIS CHARACTERISTICS AND KINETICS ANALYSIS OF PELLETS MADE FROM SEMI-COKE POWDER AND BIOMASS

Zhang Naixin^1,2, Zhu Hongyu², Lang Lin², Liu Huacai², Yin Xiuli², Gong Bin¹

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摘要

通过掺混不同比例的兰炭末与中药渣原料制备生物质基兰炭型煤,实现兰炭末的高效低碳热转化利用。采用热重分析方法研究兰炭末与生物质在不同掺混比例和升温速率下的共热解特征,揭示兰炭末与中药渣共热解的协同促进效应。兰炭末和中药渣的机械混配成型过程能部分解聚天然纤维素大分子的原生晶体结构,降低型煤样品的纤维素含量和结晶度,有利于降低其热解活化能。利用Starink等转化率法进行共热解动力学分析,计算热解反应活化能,并采用修正的反应机理函数Dn模型,结合主曲线法,获得反应级数n和指前因子A等动力学参数。研究发现,随着兰炭末占比的适度增加,共热解活化能有所降低,当中药渣与兰炭末混配比例为2∶1时,混配成型颗粒的热解活化能仅为162.2 kJ/mol,既大幅低于兰炭末原料的热解活化能（386.2 kJ/mol）,也明显低于中药原料的热解活化能（174.9 kJ/mol）;且在所有掺混比下,实验所得共热解活化能均小于理论计算值,表明兰炭末与中药渣共热解过程发生协同作用。当兰炭末占比≤50%时,升温速率对共热解协同效应的影响更为显著,升温速率越高,共热解特征指数越大。最后,考察生物质基兰炭型煤的成型颗粒和热解半焦颗粒的抗压强度随兰炭末占比的增加呈先升高后下降的趋势,制备生物质基兰炭型煤时中药渣与兰炭末的最佳掺混比为4∶1,其成型颗粒和热解半焦颗粒的强度最高,分别达到715.5和158.3 N。

Abstract

Semi-coke biomass briquette was prepared by mixing different ratios of fine semi-coke and herb residue, so as to realize the high-efficiency and low-carbon heat conversion and utilization of fine semi-coke. Thermogravimetric analysis revealed synergistic promotional effects during co-pyrolysis under different blending ratios and heating rates. The mechanical blending and briquetting process of semi-coke powder and herb residue partially depolymerized the native crystalline ctracture of cellulose, reducing the cellulose content and crystallinity of the briquettes, thereby lowering the pyrolysis activation energy. The co-pyrolysis kinetics was analyzed by Starink method and the activation energy of the pyrolysis reaction was calculated. The reaction order n and pre-exponential tactor A were determined using the generalized master with the modified Dn-Jader model to obtain the reaction series n and the pre-exponential factor A. It is found that the activation energy of pyrolysis decreased as the proportion of fine semi-coke in the herb residue increased. When the herb residue and fine semi-coke were mixed at a ratio of 2∶1, the pyrolysis activation energy of the formed briquettes is only 162.22 kJ/mol, not only significantly lower than the pyrolysis activation energy of fine semi-coke 386.2 kJ/mol, but also significantly lower than the pyrolysis activation energy of herb residue 174.9 kJ/mol; At other different mixing ratios, the activation energy of co-pyrolysis was less than the theoretical value, which indicated that the co-pyrolysis process of herb residue and fine semi-coke is synergistic. When the proportion of fine semi-coke ≤50%, the heating rate affects the synergistic effect of co-pyrolysis more significantly, and the higher the heating rate, the greater the characteristic index of co-pyrolysis. Finally, it is found that the strength of briquette and coal-char pellets of samples decreases with the increase of the proportion of fine semi-coke in the herb residue increased, and it was found that when the mixing ratio of the herb residue and fine semi-coke was 4∶1, the compressive strength of briquette and coal-char pellets of semi-coke biomass briquette were the highest, reaching 715.5 N and 158.3 N respectively.

导出引用

张乃心, 朱虹宇, 郎林, 刘华财, 阴秀丽, 龚斌. 兰炭末与生物质混配成型颗粒的共热解特性与动力学分析[J]. 太阳能学报. 2025, 46(5): 678-689 https://doi.org/10.19912/j.0254-0096.tynxb.2023-2062

Zhang Naixin, Zhu Hongyu, Lang Lin, Liu Huacai, Yin Xiuli, Gong Bin. CO-PYROLYSIS CHARACTERISTICS AND KINETICS ANALYSIS OF PELLETS MADE FROM SEMI-COKE POWDER AND BIOMASS[J]. Acta Energiae Solaris Sinica. 2025, 46(5): 678-689 https://doi.org/10.19912/j.0254-0096.tynxb.2023-2062

中图分类号： TK6 TQ530.2

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