Changes in Char Structure during the Gasification of a Victorian Brown Coal in Steam and Oxygen at 800 °C

被引:94
作者
Guo, Xin [1 ,2 ]
Tay, Hui Ling [1 ]
Zhang, Shu [1 ]
Li, Chun-Zhu [1 ]
机构
[1] Monash Univ, Dept Chem Engn, Clayton, Vic 3800, Australia
[2] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
D O I
10.1021/ef800528c
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Char structure is an important factor influencing its reactivity during gasification. This study aims to investigate the changes in char structure during the gasification of brown coal. A Victorian brown coal was gasified in a fluidized-bed/fixed-bed reactor at 800 degrees C in atmospheres containing 15% H(2)O, 2000 ppm O(2), or 15% H(2)O and 2000 ppm O(2), respectively. Although the char gasification in 2000 ppm O(2) was mainly rate-limited by the external diffusion Of O(2), the char-H(2)O reaction was mainly rate-limited by the chemical reactions. The structural features of char at different levels of char gasification conversion were examined with FT-Raman spectroscopy. Our results show that the chars from the gasification in the mixture of 2000 ppm O(2) and 15% H(2)O had almost the same features as the chars from the gasification in 15% H(2)O alone when the same levels of char conversion were achieved. Both the thermal decomposition of char and the char gasification reactions could result in changes in char structure during gasification.
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页码:4034 / 4038
页数:5
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