期刊
ENERGY CONVERSION AND MANAGEMENT
卷 168, 期 -, 页码 599-610出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2018.05.003
关键词
Pressurized gasification; Pilot scale fluidized bed; Jet/grid ratio; CFD hydrodynamic analysis; Tar; Contaminant gas
资金
- Agriculture and Food Research Initiative Competitive Grant from United States Department of Agriculture National Institute of Food and Agriculture, Alabama Agricultural Experiment Station [2015-67021-22842, ALA014-6-17027]
- Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE) [DE-EE0006639]
A pilot scale pressurized (50 psi) fluidized bed gasification was performed to investigate the effects of the jet/grid air ratio (5:95-90:10) and equivalence ratio (ER = 0.23-0.45) on the gasification products such as syngas, tar, contaminant gas, and biochar. There was a noticeable effect of the jet/grid ratios on the syngas concentration. An increase in CO, CH4, and C-2 gases was obtained at the condition closer to jet/grid = 50:50, whereas a higher jet/grid ratio favored water gas shift reaction by increasing CO2 and H-2 gases under the pressurized condition. The highest lower heating value (LHV) of 7.7 MJ/Nm(3) was obtained at the lowest ER = 0.23. Both the jet/grid ratio and ER were important parameters in determining the H-2 concentration. The cold gasification and carbon conversion efficiencies were obtained as high as 66% and 94%, respectively. Also, higher temperature and ER promoted a reduction in contaminant gases as well as tar yield. Tar product yield was also reduced significantly after a wet scrubber, and the tar consisted of chemicals of a carbon number less than 13 (<= C-12). The gasification biochar was also analyzed and showed an effective carbon sequestration property with a relatively higher surface area (105 m(2)/g). Furthermore, computational fluid dynamics simulation was performed to determine the effects of different jet/grid air ratio and pressure conditions on the hydrodynamics in the fluidized bed reactor.
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