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Title: Computational simulation of a 100 kW dual circulating fluidized bed reactor processing coal by chemical looping with oxygen uncoupling

Journal Article · · International Journal of Greenhouse Gas Control
 [1];  [2];  [1];  [3]
  1. Univ. of Utah, Salt Lake City, UT (United States)
  2. Reaction Engineering International, Midvale, UT (United States)
  3. Boise State Univ., ID (United States)
+ Show Author Affiliations

Chemical looping with oxygen uncoupling (CLOU) is a promising carbon capture technology that utilizes two interconnected fluidized-bed reactors to separate oxygen from air using a metal oxide, and then to use that oxygen to combust fuel in a nitrogen-free environment. CLOU is particularly well suited for solid fuels such as coal since released O2 will readily combust with solid char. This study presents simulations of the University of Utah's dual fluidized bed chemical looping process development unit (PDU) operating as a CLOU system at 100 kWth, using CPFD Software's Barracuda-VR™ CFD modeling program. A full 3D model of the PDU was used including both reactors, as well as loop seals and cyclone separators. Hydrodynamic settings and the drag model are based on previous cold-flow validation experiments. Mechanisms describing CLOU reaction kinetics for cuprous oxide oxidation in the air reactor and cupric oxide reduction in the fuel reactor were adapted from previously completed experimental work. Coal char kinetics were based on the carbon-hydrogen-nitrogen-oxygen-sulfur, CHNOS, method. Submodels for devolatilization, gasification, and homogenous gas-phase reactions used relationships from the literature. Results predict volatile burnout almost immediately, though coal combustion continues into the upper portions of the fuel reactor and cyclone. Lastly, nitrogen gas leakage into the fuel reactor is shown to be mostly carryover from the air reactor

Research Organization:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0025076; FE0029160
OSTI ID:
1593104
Alternate ID(s):
OSTI ID: 1780081
Report Number(s):
DOE-U_Utah-0025067-02; TRN: US2100854
Journal Information:
International Journal of Greenhouse Gas Control, Vol. 90, Issue C; ISSN 1750-5836
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

References (22)

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Chemical looping combustion of solid fuels journal March 2018
Performance of CLOU process in the combustion of different types of coal with CO2 capture journal January 2013
Biomass combustion with CO2 capture by chemical looping with oxygen uncoupling (CLOU) journal August 2014
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Incorporating Oxygen Uncoupling Kinetics into Computational Fluid Dynamic Simulations of a Chemical Looping System journal June 2016
Using chemical-looping with oxygen uncoupling (CLOU) for combustion of six different solid fuels journal February 2009
Chemical-looping with oxygen uncoupling for combustion of solid fuels journal January 2009
CFD model for the simulation of chemical looping combustion journal October 2014
Rate Analysis of Chemical-Looping with Oxygen Uncoupling (CLOU) for Solid Fuels journal June 2012
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Figures / Tables (25)

Figure 1(p. 5)figure Figure 1
Table 1(p. 6)table Table 1
Table 2(p. 6)table Table 2
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Table 4: Part 1(p. 7)table Table 4: Part 1
Table 4: Part 2(p. 7)table Table 4: Part 2
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Figure 14(p. 26)figure Figure 14
Figure 15(p. 26)figure Figure 15
Table 9(p. 27)table Table 9

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42 ENGINEERING
Chemical looping
Fluidized bed
CLOU simulation
Reactor modeling