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A new two-stage gasification process, consisting of a fluidized-bed (FB) pyrolyzer and a downdraft fixed-bed (DFB) gasifier, has been proposed to gasify powder coal for fuel gas production with low tar generation. Aiming at developing the new technology, this paper investigated the means for coal pyrolysis gas upgrading, with the focus on tar removal by both thermal cracking with or without the presence of oxygen and catalytic cracking or reforming over a char bed in a fixed-bed reactor downstream of a FB coal pyrolyzer. The presence of oxygen and the adoption of a char bed evidently facilitated the tar removal performance and also improved the produced fuel gas quality. Analyzing the tar sample collected at the outlet of the tar removal reactor with gas chromatography–mass spectrometry (GC–MS) clarified that the oxidation by O2 and the char-catalyzed reforming both exhibited certain selectivity to the tar-containing chemical species. In addition, the property of char played an important role on its catal...
| Authors: | Xi Zeng; Yin Wang; Jian Yu; Shisheng Wu; Jiangze Han; Shaoping Xu; Guangwen Xu | |
| Journal: | Energy & Fuels | |
| Year: | 2011 | |
| DOI: | 10.1021/ef2012276 | |
| Publication date: | 17-11-2011 |
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