文献类型：期刊文献

英文题名：Effects of coal drying on the pyrolysis and in-situ gasification characteristics of lignite coals

作者：Ding, Lu[1];Zhou, Zhijie[1];Dai, Zhenghua[1];Yu, Guangsuo[1]

机构：[1]E China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：155

起止页码：660

外文期刊名：APPLIED ENERGY

收录：;EI(收录号：20152701006595);WOS:【SCI-EXPANDED(收录号:WOS:000360950900055)】；

基金：This work has been partially supported by the National High Technology Research and Development of China (863 program, 2012AA053101), and the National Natural Science Foundation of China (21376081).

语种：英文

外文关键词：Pyrolysis behaviors; Lignite coals; In-situ heating stage; Catalytic active sites

摘要：Pyrolysis behaviors of two lignite coals with different drying conditions were determined by a thermo-gravimetric analyzer coupled with mass spectrometer (TG-MS) and a high-frequency furnace. An in-situ heating stage microscope was adopted to observe the morphological changes during char-CO2 gasification process. It is concluded that the effects of moisture contents in coals on the gaseous release process during coal pyrolysis mainly depend on coal type, final pyrolysis temperature and heating method. The in-situ heating stage experiments indicate that the shrinking particle mode is suitable to illustrate the gasification reaction mechanism in the initial and midterm reaction stages of all the lignite char samples. Although drying conditions have significant effects on coal pyrolysis process under rapid heating, these dewatering conditions result in little noticeable reactivity loss of the char during the subsequent char-CO2 gasification reaction. The measuring results of catalytic active sites can well explain the similar reactivity of lignite coals with different drying conditions. (C) 2015 Elsevier Ltd. All rights reserved.