Large Eddy Simulation of a 15MW Tangentially Oxy-Fired Pulverized Coal Boiler: Ignitor

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Title Large Eddy Simulation of a 15MW Tangentially Oxy-Fired Pulverized Coal Boiler: Ignitor
Creator Pedel, Julien; Wu, Yuxin; Schmidt, John; Thornock, Jeremy; Smith, Philip J.
Publication type report
Date 2012-09-06
Abstract Oxy-coal combustion, in which an O2/CO2 mixture replaces air, is one of the few possible capture technologies to enable CO2 sequestration for existing coal-fired boilers. Burning coal with relatively pure oxygen, together with recycled flue gases, can produce a highly concentrated (up to 95% CO2) flue gas stream, which makes carbon sequestration more economical. One issue of interest in rapidly implementing a strategy to retrofit existing air-fired units is to understand how replacing air by a O2/CO2 mixture changes the kinetics, aerodynamics and heat transfer of the flame. This study presents Large Eddy Simulations (LES) of a commercial scale pulverized coal boiler in oxycombustion conditions. Simulations were performed using Arches, a massively parallel LES tool developed at the University of Utah on Kraken, one of the fastest academic computer in the world on 10,000+ processors. The simulation was applied to a 15 MW boiler with tangential fired burners located in the corners under oxy-combustion conditions with an overall PO2 = 40%. Particles are tracked in an Eulerian framework with the Direct Quadrature Method of Moments (DQMOM). Coal devolatilization and char combustion are modeled and the Discrete Ordinates method is used to solve radiation. Results show that LES coupled with DQMOM has the potential to predict oxy-coal flame characteristics and to be an important tool in the retrofitting or design process of oxy-coal burners and boilers.
Type Text
Format application/pdf
Rights This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee.
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ARK ark:/87278/s6x069pv
Setname uu_afrc
Date Created 2013-02-13
Date Modified 2021-05-06
ID 14338
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