A two-stage circulated fluidized bed process to minimize tar generation of biomass gasification for fuel gas production

Chao Wang, Lianfeng Zhu, Mengjuan Zhang, Zhennan Han, Xin Jia, Dingrong Bai, Wenli Duo, Xiaotao Bi, Abuliti Abudula, Guoqing Guan and Guangwen Xu

Applied Energy, 2022, vol. 323, issue C, No S0306261922009412

Abstract: This study tested a two-stage circulated fluidized bed process consisting of a downer for pyrolysis of biomass and a riser for char gasification and tar removal to produce fuel gas containing tar below 100 mg/Nm3 from pine chips using steam-oxygen (not N2-oxygen) as the agent. A pilot facility treating 15 kg/h biomass was run at different equivalent ratios (ERs) and steam-to-biomass ratios (S/Bs). Under the typical conditions of S/B = 0.15 and ER = 0.3, the produced fuel gas contained (in volume) 21.64% CO, 21.97% CO2, 15.34% H2, 18.59% CH4, 1.49% CnHm and 1.83 g/Nm3db tar. A long-tern running of the pilot pant realized a tar content low as 95.5 mg/Nm3db in the produced gas. These results thus well verified the technology feasibility for low-tar biomass fuel production via the two-stage circulated fluidized bed steam-oxygen gasification.

Keywords: Two-stage gasification; Low-tar fuel gas; Biomass; Reaction decoupling; Steam-oxygen; Circulated fluidized bed (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (3)

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DOI: 10.1016/j.apenergy.2022.119639

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