Transient simulation of biomass combustion in a circulating fluidized bed riser

Banerjee, Subhodeep; Shahnam, Mehrdad; Rogers, William A.; Hughes, Robin W.

doi:10.1016/j.energy.2022.126127

Transient simulation of biomass combustion in a circulating fluidized bed riser

Journal Article · Fri Nov 18 23:00:00 EST 2022 · Energy

DOI:https://doi.org/10.1016/j.energy.2022.126127· OSTI ID:1984083

^[1]; Shahnam, Mehrdad ^[1]; Rogers, William A. ^[1]; Hughes, Robin W. ^[2]

National Energy Technology Lab. (NETL), Morgantown, WV (United States)
CanmetENERGY, Ottawa, ON (Canada); Natural Resources Canada, Edmonton, AB (Canada)

Interest in circulating fluidized bed (CFB) boilers as a power generation technology has sky-rocketed in recent years because of several advantages this technology offers over conventional boilers, such as increased gas-solid mixing, which results in higher combustion efficiency and the ability to use lower rank fuels. CFB combustors are operated at lower temperatures than conventional thermal power generation combustors, thus reducing NO_x emissions, while SO₂ emissions can be conveniently controlled through the addition of Ca-based sulfur sorbents within the combustor. Herin this paper summarizes the modeling effort on a 50 kW_th CFB combustor designed, built, and operated at CanmetENERGY in Ottawa, Canada. The numerical model employs the multiphase particle-in-cell (PIC) approach in the open-source Multiphase Flow with Interphase eXchanges (MFiX) Software Suite. The MFiX-PIC model parameters for the simulation are tuned against cold-flow experiments from CanmetENERGY using olivine sand as the inert bed material. It is shown that for the relatively coarse fluid meshes and large parcel sizes necessitated by the scale of the simulation, filter size dependent corrections to the drag law must be incorporated to ensure accuracy of the simulation results. The validated cold flow model is extended to simulate reacting flow with torrefied hardwood as the feedstock and to validate the combustion reaction scheme. The species concentrations at the riser outlet are compared against CanmetENERGY’s experiments and show satisfactory agreement. The simulations demonstrate the ability of MFiX-PIC to accurately capture both the physics and chemistry of a CFB combustor at bench scales, which can be further extended to pilot- and industrial-scale systems.

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: 89243318CFE000003

OSTI ID:: 1984083

Alternate ID(s):: OSTI ID: 1901420

Journal Information:: Energy, Journal Name: Energy Vol. 264; ISSN 0360-5442

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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