Computational Simulation of a Dual Circulating Fluidized Bed Reactor Processing Coal by Chemical Looping with Oxygen Uncoupling

Reinking, Zachary; Whitty, Kevin; Lighty, JoAnn

doi:10.1016/j.ijggc.2019.102795

Computational Simulation of a Dual Circulating Fluidized Bed Reactor Processing Coal by Chemical Looping with Oxygen Uncoupling

Conference · 24 September 2018 · International Journal of Greenhouse Gas Control

DOI:https://doi.org/10.1016/j.ijggc.2019.102795· OSTI ID:1593129

Reinking, Zachary; Whitty, Kevin; Lighty, JoAnn

Chemical looping with oxygen uncoupling (CLOU) is variant of chemical looping combustion in which the oxygen carrier spontaneously releases gaseous oxygen in the fuel reactor. CLOU is particularly well suited for solid fuels such as coal, since the O2 will readily combust solid char. The University of Utah has constructed a chemical looping process development unit (PDU) that employs two circulating fluidized bed reactors connected by loop seals and with cyclones for separation of product gas and oxygen carrier. This work details a 3D, transient simulation of the University of Utah PDU system using CPFD Software’s Barracuda-VR® modeling program. The model includes the air and fuel reactors, along with the cyclone separators and loop seals. Hydrodynamic modelling was adapted from a previously validated simulation of a scaled-down cold-flow unit. Reactions and reaction rates were user defined. Reduced mechanisms describing CLOU reaction kinetics for cuprous oxide oxidation in the air reactor and cupric oxide reduction (“uncoupling”) in the fuel reactor were adapted from experimental work done at the University of Utah. Submodels for coal devolatilization, char combustion and homogeneous gas-phase reactions use established relationships available in existing literature. Results predict local gas and particle velocities, temperature and pressure profiles in the reactors, evolution of carbon dioxide in the fuel reactor, product gas composition and CO2 capture efficiency.

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Research Organization:: Univ. of Utah, Salt Lake City, UT (United States)

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

DOE Contract Number:: FE0025076

OSTI ID:: 1593129

Report Number(s):: DOE-U_Utah-0025067-06

Journal Information:: International Journal of Greenhouse Gas Control, Vol. 90; Conference: 5th International Conference on Chemical Looping, 24-27 September 2018, Park City, Utah; ISSN 1750-5836

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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