Interactions during co-pyrolysis of direct coal liquefaction residue with lignite and the kinetic analysis
Interactions during co-pyrolysis of direct coal liquefaction residue with lignite and the kinetic analysis
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煤直接液化残渣与褐煤共热解过程中的相互作用及动力学分析
DOI：
10.1016/j.fuel.2017.11.080
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发表时间：
2018-03
期刊：
影响因子：
7.4
通讯作者：
Wen Li
中科院分区：
文献类型：
--
作者：
Junli Xu;Zongqing Bai;Zheng Li;Zhenxing Guo;Pan Hao;Jin Bai;Wen Li
采用热重分析仪（TGA）研究了煤直接液化残渣（DCLR）与褐煤的共热解过程，并采用Kissinger-Akahira-Sunose方法分析了动力学特性。本工作考虑了 DCLR 与褐煤的不同质量比（10:0、8:2、6:4、4:6、2:8 和 0:10）。同时还研究了DCLR中各个组分对共热解过程的影响。结果表明，DCLR与褐煤共热解曲线的实验曲线与计算曲线存在显着差异。这种差异与热解温度和样品的混合比例有关。 DCLR与褐煤共热解在低温(200~500℃)下挥发物产率增加(实验挥发物产率>计算值1)，而在高温下降低(实验挥发物产率<计算值1，500~900℃)，并且随着DCLR的加入，挥发物产率在低温下的增加幅度减弱，而在高温下的下降幅度加强。低温下共热解样品挥发物的增加归因于 DCLR 中的重油和沥青质，而 DCLR 中的所有单独馏分都可能导致高温下挥发物产率的降低。褐煤与DCLR共热解样品的活化能随着DCLR用量的增加而降低，表明混合样品的共热解反应活性逐渐增强。
Co-pyrolysis process of direct coal liquefaction residue (DCLR) with lignite was examined by thermogravimetric analyzer (TGA) and the kinetic characteristics were analyzed using Kissinger-Akahira-Sunose method. And different mass ratios of DCLR to lignite (10:0, 8:2, 6:4, 4:6, 2:8 and 0:10) were considered in this work. At the same time the influences of individual components in DCLR on co-pyrolysis process were investigated as well. Results showed that significant difference presented in experimental and calculated co-pyrolysis curves of DCLR with lignite. And such difference was related to pyrolysis temperature and mixed ratio of sample. The volatiles yield increased (experimental volatiles yield > calculated one) for the co-pyrolysis of DCLR with lignite at low temperatures (200–500○C) while decreased at high temperatures (experimental volatiles yield < calculated one, 500–900○C), and with the addition of DCLR, such increasement of volatile yield at low temperatures was weakened whereas the decrement at high temperatures was strengthened. The increase of volatiles of co-pyrolysis samples at low temperatures was ascribed to the heavy oils and asphaltenes in DCLR whereas all the individual fractions in DCLR could result in the decrease of volatile yield at high temperatures. And the activation energies of co-pyrolysis samples of lignite with DCLR decreased with the increase of DCLR dosage, which indicated that the co-pyrolysis reactivity of mixed samples increased gradually.
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影响因子：
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作者：
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