Tar formation during coal pyrolysis under N-2 and CO2 atmospheres at elevated pressures
Tar formation during coal pyrolysis under N-2 and CO2 atmospheres at elevated pressures
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高压 N-2 和 CO2 气氛下煤热解过程中焦油的形成
DOI：
10.1016/j.jaap.2016.01.009
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发表时间：
2016
影响因子：
6
通讯作者：
Li Fan
中科院分区：
文献类型：
--
作者：
Luo Kang;Zhang Chun;Zhu Shenghua;Bai Yonghui;Li Fan
本研究在 CO2 和 N2 气氛中、700 °C 下进行了烟煤加压热解实验。对衍生的焦炭、焦油和气体进行了表征和分析，并通过 GC/MS 分析了焦油中七种酚类化合物的分布。结果表明，在CO2和N2气氛中，焦油和气体产率在压力变化范围内表现出不同的趋势，而无论N2或CO2气氛如何，焦油产率对压力变化相当不敏感。 N2气氛下焦油产率随着压力的增加呈上升趋势，热解过程中气体逸出受到抑制。对于CO2气氛，观察到焦油的消耗和气体的产生，这可能归因于高压下强化的CO2重整反应。在 N2 和 CO2 气氛中，酚的总量随着压力从 0.1⿿1.5 MPa 增加而单调增加。在N2气氛中，升高压力有利于芳环上甲基取代基的裂解，生成甲基取代基较少的酚类化合物，而在CO2气氛中升高压力则可以提高芳环上甲基取代基的数量。
A bituminous coal pressurized pyrolysis experiments were conducted in CO2and N2atmospheres at 700 °C and in this study. The derived chars, tars and gases were characterized and analyzed, and the distribution of seven phenolic compound species in tar was analyzed by the GC/MS. The results indicate that the tar and gas yields in CO2and N2showed different trends within the variation of the pressures, while the char yields were quite insensitive to the change in pressure regardless of N2or CO2atmosphere. The tar yields under N2atmosphere exhibited an uptrend with the pressure increasing, and the gas evolution was inhibited during pyrolysis. As for CO2atmosphere, the consumption of tars and generation of gases were observed, which could be attribute to reinforced CO2-reforming reaction at elevated pressures. The total amount of phenols monotonically increase with increasing pressures from 0.1⿿1.5 MPa in both N2and CO2atmosphere. In N2atmosphere, elevated pressures are in favor of cleavage of the methyl substituent on aromatic ring and the generation of the phenols with less methyl substituents, while increasing pressure in CO2could improve the amount of methyl substituent on aromatic ring.