Primary Fragmentation Characteristics of Coal Particles during Rapid Pyrolysis

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• 作者：Tongmin Cui ; Zhijie Zhou ; Zhenghua Dai ; Chao Li ; Guangsuo Yu ; Fuchen Wang
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：October 15, 2015
• 年：2015
• 卷：29
• 期：10
• 页码：6231-6241
• 全文大小：895K
• ISSN：1520-5029

文摘

Experiments were carried out to investigate the rapid pyrolysis of Nei-meng (NM) lignite, Shen-fu (SF) bituminous coal, and Jin-cheng (JS) anthracite with the duration time of 0鈥?00 ms and the temperature of 1173鈥?773 K using a high-frequency induction furnace. Interest was centered on the primary fragmental characteristics of particles, including the changes of mass loss, particle density, and size distribution, during the pyrolysis. A pair of fragmental parameters, i.e., dimensionless particle diameter 未 and particle distribution S_f, was proposed to characterize the fragmentation during the different stages of pyrolysis. The result showed that the pyrolysis progress increases with time and temperature. The fragmentation extent is also positively related to the time and temperature. The progress of primary fragmentation is lignite 鈮?bituminous coal > anthracite. However, the particle morphology changes little during the pyrolysis fragmentation. Evidence reveals that major fragmentations of NM and SF occur at the outer zone of the particle and the coarse fragmentation of JS is insignificant compared to the exfoliation.