文献类型：期刊文献

英文题名：Effects of alkaline metal on coal gasification at pyrolysis and gasification phases

作者：Xu Shenqi[1];Zhou Zhijie[1];Xiong Jie[1];Yu Guangsuo[1];Wang Fuchen[1]

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

年份：2011

卷号：90

期号：5

起止页码：1723

外文期刊名：FUEL

收录：;EI(收录号：20111113751196);WOS:【SCI-EXPANDED(收录号:WOS:000288243100003)】；

基金：This work has been partially supported by the Major State Basic Research Development Program of China (973 Program, 2010CB227006), the National Natural Science Foundation of China (20876048). The authors also acknowledge Prof. Wei-chi Ying (School of Resource and Environmental Engineering, ECUST) for his help on language.

语种：英文

外文关键词：Pyrolysis; Catalytic reactions; XRD; Alkaline metal

摘要：A Chinese high-rank coal was acid-washed and ion-exchanged with Na and K to prepare the H-form, Na-form and K-form coals. After pyrolysis, H-form, Na-form and K-form chars and two additional H-form chars (acid washed Na-form and K-form chars) were prepared to investigate the effects of alkaline metal (AM) on coal gasification at the pyrolysis and gasification phases. The H-form char had the highest pryolysis rate; the H-form char had a relative low gasification rate. The AM loaded coals exhibited relative low pyrolysis rate, while the corresponding chars had high gasification reactivity. Acid-washing reduced the reactivities of Na-form and K-form chars. AM inhibited the progress of graphitization of the base carbon resulting in a more reactive char of less ordered crystalline carbon structure. A kinetic model incorporating AM-catalyzed gasification and non-catalytic gasification was developed to describe the gasification rate changes in the char conversion for AM-catalyzed gasification of chars. (C) 2011 Elsevier Ltd. All rights reserved.