期刊
ENERGY & FUELS
卷 22, 期 6, 页码 4034-4038出版社
AMER CHEMICAL SOC
DOI: 10.1021/ef800528c
关键词
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资金
- Victorian State Government under its Energy Technology Innovation Strategy
- Latrobe Valley Generators
- National Key Basic Research and Development Program
- Ministry of Science and Technology, China [2006CB705806]
- National Natural Science Foundation of China (NSFC) [90410017]
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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