文献类型：期刊文献

英文题名：A numerical study on the pyrolysis of large coal particles: Heat transfer and volatile evolution

作者：Meng, Dexi[1];Wang, Tian[1];Xu, Jianliang[1];Chen, Xueli[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China

年份：2019

卷号：254

外文期刊名：FUEL

收录：;EI(收录号：20192507079165);WOS:【SCI-EXPANDED(收录号:WOS:000476980200008)】；

基金：This work was supported by the National Key Research and Development Project of China (2016YFB0600400), the Fundamental Research Funds for the Central Universities, China (222201718003).

语种：英文

外文关键词：Large coal particles; Pyrolysis model; Heat transfer; Volatile evolution; Intraparticle gradients

摘要：A pyrolysis model coupled with heat transfer and volatile evolution has been presented to characterize the internal heat transfer and pyrolysis behavior of a large coal particle. The applicability of kinetic model (DAEM) was first verified, then the ability of the large particle pyrolysis model to estimate the particle temperature variation was validated. In order to investigate the effects of pyrolysis temperature and particle size on pyrolysis characteristics of large particles, temperature and volatile yield profiles inside the particle were numerically studied. Results showed that the influence of pyrolysis temperature and particle size were quite significant. For the low pyrolysis temperature (600 degrees C) and small particle size (6 mm), the maximum temperature difference inside the particle was less than 100 degrees C, an assumption of homogeneous pyrolysis may be roughly adopted. While for the high pyrolysis temperature (1000 degrees C) and large particle size (22 mm), more than 200 degrees C temperature difference was found in the particle, notable gradients could be observed in the transient profiles of volatile yield. The effects of pyrolysis temperature and particle size on the residual density inside the coal particle have also been investigated numerically using the pyrolysis model.