Modeling the impact of bubbling bed hydrodynamics on tar yield and its fluctuations during biomass fast pyrolysis

Xiong, Qingang; Ramirez, Emilio; Pannala, Sreekanth; Daw, C. Stuart; Xu, Fei

doi:10.1016/j.fuel.2015.09.074

Title: Modeling the impact of bubbling bed hydrodynamics on tar yield and its fluctuations during biomass fast pyrolysis

Journal Article · Fri Oct 09 00:00:00 EDT 2015 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2015.09.074· OSTI ID:1238738

Xiong, Qingang ^[1]; Ramirez, Emilio ^[1]; Pannala, Sreekanth ^[2]; Daw, C. Stuart ^[1]; Xu, Fei ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Saudi Arabia Basic Industries Corp. Americas, Sugar Land, TX (United States)
Iowa State Univ., Ames, IA (United States)

The impact of bubbling bed hydrodynamics on temporal variations in the exit tar yield for biomass fast pyrolysis was investigated using computational simulations of an experimental laboratory-scale reactor. A multi-fluid computational fluid dynamics model was employed to simulate the differential conservation equations in the reactor, and this was combined with a multi-component, multi-step pyrolysis kinetics scheme for biomass to account for chemical reactions. The predicted mean tar yields at the reactor exit appear to match corresponding experimental observations. Parametric studies predicted that increasing the fluidization velocity should improve the mean tar yield but increase its temporal variations. Increases in the mean tar yield coincide with reducing the diameter of sand particles or increasing the initial sand bed height. However, trends in tar yield variability are more complex than the trends in mean yield. The standard deviation in tar yield reaches a maximum with changes in sand particle size. As a result, the standard deviation in tar yield increases with the increases in initial bed height in freely bubbling state, while reaches a maximum in slugging state.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1238738

Alternate ID(s):: OSTI ID: 1396690

Journal Information:: Fuel, Vol. 164, Issue C; ISSN 0016-2361

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 66 works

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Title: Modeling the impact of bubbling bed hydrodynamics on tar yield and its fluctuations during biomass fast pyrolysis

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