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Towards understanding the interactions between mild liquefaction solid product and Hami sub-bituminous coal during their co-pyrolysis
Journal of Analytical and Applied Pyrolysis ( IF 6 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.jaap.2019.104742
Zhihao Feng , Zongqing Bai , Hongyan Zheng , Zhenxing Guo , Lingxue Kong , Jin Bai , Wen Li

Abstract Co-pyrolysis behaviors of MLS with Hami sub-bituminous coal (HM) were examined by a thermogravimetric analyzer coupled with a mass spectrometer and the kinetic characteristics were interpreted with simplified distributed activation energy model, aiming at understanding the co-pyrolysis characteristics and interactions between MLS and coal, and providing some useful guidance for the efficient utilize of MLS. Two special crucible reactors with or without a vertical baffle were made to investigate the interactions between MLS and HM during co-pyrolysis. Results show that the amount of C–H bonds in MLS is more abundant, but the oxygen-containing functional groups are less compared with HM. The pyrolysis reactivity of MLS is higher than that of HM, and that of blends increases with the MLS dosage increasing. The co-pyrolysis behaviors including weight loss, weight loss rate and the gas emission characteristics of MLS and HM in the two crucibles were compared, and it is found that the different results are related to pyrolysis temperature and MLS dosage. The role of promoting release of volatiles is mainly caused by the hydrogen supply from MLS and the opposite effect is mainly ascribed to the heat and mass transfer caused by low softening point and strong cohesiveness of MLS. In addition, the activation energies of co-pyrolysis of the blends significantly decrease with the increase of MLS dosage.

中文翻译:

了解轻度液化固体产物与哈密亚烟煤共热解过程中的相互作用

摘要 采用热重分析仪和质谱仪联用 MLS 与哈密亚烟煤 (HM) 的共热解行为,并用简化的分布式活化能模型解释动力学特性,旨在了解共热解特性和相互作用。 MLS 和煤炭之间的关系,并为 MLS 的有效利用提供一些有用的指导。制作了两个带有或不带有垂直挡板的特殊坩埚反应器来研究共热解过程中 MLS 和 HM 之间的相互作用。结果表明,与 HM 相比,MLS 中 C-H 键的数量更丰富,但含氧官能团较少。MLS的热解反应活性高于HM,且共混物的热解反应性随着MLS用量的增加而增加。比较了两种坩埚中MLS和HM的共热解行为包括失重、失重率和气体排放特性,发现不同的结果与热解温度和MLS用量有关。促进挥发物释放的作用主要是由MLS的氢气供应引起的,相反的作用主要归因于MLS的低软化点和强内聚性引起的传热和传质。此外,共混物的共热解活化能随着MLS用量的增加而显着降低。促进挥发物释放的作用主要是由MLS的氢气供应引起的,相反的作用主要归因于MLS的低软化点和强内聚性引起的传热和传质。此外,共混物的共热解活化能随着MLS用量的增加而显着降低。促进挥发物释放的作用主要是由MLS的氢气供应引起的,相反的作用主要归因于MLS的低软化点和强内聚性引起的传热和传质。此外,共混物的共热解活化能随着MLS用量的增加而显着降低。
更新日期:2020-01-01
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