Kinetic models comparison for steam gasification of coal/biomass blend chars.
Kinetic models comparison for steam gasification of coal/biomass blend chars.
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DOI：
10.1016/j.biortech.2014.07.099
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发表时间：
2014-11
影响因子：
11.4
通讯作者：
Chaofen Xu;Song Hu;J. Xiang;Haiping Yang;L. Sun;Sheng Su;Baowen Wang;Qindong Chen;Limo He
中科院分区：
文献类型：
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作者：
Chaofen Xu;Song Hu;J. Xiang;Haiping Yang;L. Sun;Sheng Su;Baowen Wang;Qindong Chen;Limo He
采用非等温热重法（TGA）研究了褐煤（LN）、锯末（SD）及其不同质量比混合物制得的半焦在水蒸气气氛下的热反应性。热重分析表明，当木屑与褐煤的质量比为1：4时，木屑与褐煤之间的相互作用最显著，但随着木屑用量的增加，木屑中的碱性矿物在高温下发生团聚和失活，这种正相互作用逐渐减弱。通过系统的比较，可以看出，在本研究所采用的三种气固反应模型中，无规孔模型是最合适的。最后，通过气固反应模型得到了合理的动力学参数，为本研究中褐煤与木屑共气化实际系统的设计和运行提供了依据。
The non-isothermal thermogravimetric method (TGA) was applied to different chars produced from lignite (LN), sawdust (SD) and their blends at the different mass ratios in order to investigate their thermal reactivity under steam atmosphere. Through TGA analysis, it was determined that the most prominent interaction between sawdust and lignite occurred at the mass ratio of sawdust/lignite as 1:4, but with further dose of more sawdust into its blends with lignite, the positive interaction deteriorated due to the agglomeration and deactivation of the alkali mineral involved in sawdust at high steam gasification temperature. Through systematic comparison, it could be observed that the random pore model was the most suitable among the three gas–solid reaction models adopted in this research. Finally, rational kinetic parameters were reached from these gas–solid reaction models, which provided a basis for design and operation of the realistic system of co-gasification of lignite and sawdust in this research.