Prediction of flow behavior of the riser in a novel high solids flux circulating fluidized bed for steam gasification of coal or biomass
A triple-bed combined circulating fluidized bed (TBCFB) system, which is composed of a downer, a bubbling fluidized bed (BFB), and a riser, is proposed for the pyrolysis and gasification of coal and biomass. In order to effectively utilize the heat energy produced by the combustion of the char in th...
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| Veröffentlicht in: | Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2010-10, Vol.164 (1), p.221-229 |
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| container_title | Chemical engineering journal (Lausanne, Switzerland : 1996) |
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| creator | Guan, Guoqing Fushimi, Chihiro Tsutsumi, Atsushi |
| description | A triple-bed combined circulating fluidized bed (TBCFB) system, which is composed of a downer, a bubbling fluidized bed (BFB), and a riser, is proposed for the pyrolysis and gasification of coal and biomass. In order to effectively utilize the heat energy produced by the combustion of the char in the riser for the pyrolysis of coal/biomass in the downer and/or gasification of char in the BFB, a high solids mass flux and a large solids holdup are necessary. An analysis of the overall pressure balance around the TBCFB was presented for predicting the maximum achievable solid mass flux under given experimental conditions. The effects of solids inventory, particle physical properties, and gas seal structures on the solids mass flux and the solids holdup were discussed. A correlation for the prediction of solids mass flux in the range of 200–400
kg/m
2
s in the riser under operating conditions was developed based on experimental data from the literature and our laboratory. |
| doi_str_mv | 10.1016/j.cej.2010.08.005 |
| format | Article |
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kg/m
2
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| ispartof | Chemical engineering journal (Lausanne, Switzerland : 1996), 2010-10, Vol.164 (1), p.221-229 |
| issn | 1385-8947 1873-3212 |
| language | eng |
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| source | Access via ScienceDirect (Elsevier) |
| subjects | Applied sciences Biomass Chemical engineering Circulating Circulating fluidized bed Coal Combustion Exact sciences and technology Fluidization Fluidized beds Flux Gasification High solids mass flux Pressure balance Risers |
| title | Prediction of flow behavior of the riser in a novel high solids flux circulating fluidized bed for steam gasification of coal or biomass |
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