Towards understanding the interactions between mild liquefaction solid product and Hami sub-bituminous coal during their co-pyrolysis

Publication date: Available online 22 November 2019Source: Journal of Analytical and Applied PyrolysisAuthor(s): Zhihao Feng, Zongqing Bai, Hongyan Zheng, Zhenxing Guo, Lingxue Kong, Jin Bai, Wen LiAbstractCo-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...

Source: Journal of Analytical and Applied Pyrolysis - November 23, 2019 Category: Chemistry Source Type: research