Numerical Modelling of Oxy-Fuel Combustion in a Full-Scale Tangentially-Fired Pulverised Coal Boiler

Al-Abbas, Audai Hussein; Naser, Jamal; Dodds, David; Blicblau, Aaron S.

doi:10.1016/j.proeng.2013.03.135

Cited by 26 publications

(4 citation statements)

References 5 publications

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“…Available carbon capturing technology includes the pre-combustion capture, postcombustion capture and oxy-fuel combustion. Since the oxy-fuel combustion was widely considered most viable technology applicable in coal-fired power plant, scholars have done intense research on this subject by means of computational fluid dynamic code recently [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Tian

Zhong

Tan

et al. 2015

Fuel Processing Technology

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Section: Introductionmentioning

confidence: 99%

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Tian

Zhong

Tan

et al. 2015

Fuel Processing Technology

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“…As it may be one reason for the velocity and temperature deviations in it, this article numerically investigates the forming mechanism of velocity M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 and temperature deviations in the tangentially fired pulverized-coal boiler furnace from the perspective of nonlinear flow characteristics. …”

mentioning

confidence: 99%

Numerical investigation of the nonlinear flow characteristics in an ultra-supercritical utility boiler furnace

Yang

Shen

et al. 2015

Applied Thermal Engineering

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“…Specifically, a conical bluff body with different diameters and cone angles were used in conjunction with different fuels. The model developed showed good agreement with the experimental results [34]. Bespalov [37] conducted an extensive study on the effect of bluff bodies on the stabilization of turbulent premixed flames.…”

Section: Cfd Modelling Of Oxy-coal Combustionmentioning

confidence: 52%

“…The CFD results showed very good agreement with the experiment in terms of the temperature distribution profiles as well as the O2, CO2, and H2O species concentration profiles at the most intense combustion location in the furnace. Al-Abbas et al [34] then further extended their work [32] to oxy-fuel combustion in a full-scale tangentially fired pulverized coal burner using the Victorian brown coal. This was modelled based on the real conditions of the Loy Yang power plant in Australia.…”

Section: Cfd Modelling Of Oxy-coal Combustionmentioning

confidence: 99%

Computational Design of Staged Pressurized Oxy-Coal Combustion

Udochukwu¹

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Staged pressurized oxy-coal combustion (SPOC) is nowadays a promising technology to be used for low-cost, low-emission, high-efficiency power generation. The objective of this thesis is to compliment the experiments ongoing at the Washington University, St. Louis (WUSTL) by means of numerical simulations, thereby providing better understanding of the fluid flow, turbulence, combustion characteristics, particle dynamics and heat transfer. Carbon dioxide (CO2) is injected alongside the coal, for its carriage. A small amount of methane (CH4) is also injected alongside the coal to maintain a steady flame. The simulations are performed for a 3D geometry with the following energy source distribution: out of 100 kW in a lab-scale reactor, 10 kW originates from CH4 and 90 kW comes from coal combustion. Steady and unsteady Reynolds-averaged Navier-Stokes (RANS) simulations are performed resulting in an asymmetric flame shape. Two causes of the flame asymmetry are hypothesized: (i) influence of coal injection and (ii) onset of a shearlayer instability due to the density variation of different gases and velocity differences of various streams in a shear layer, where mixing occurs. An impact of coal on flame symmetry is shown. In addition, a benchmark at which the further increase of coal would result in flame asymmetry has been found. The present simulations also demonstrated an occurrence of vortex shedding when the flow passes over a disk (bluff body) in a reactor, used to stabilize the flame, constituting a potential reason for periodic flame oscillations observed. An aerodynamic investigation of a flow past this bluff body is conducted for various Reynolds numbers (Re), with the bluff body height determining the characteristic length scale. Consequently, various regimes of flow are identified as Re increases. Particularly, an onset of the vortex shedding is noticed when Re > 3000. Spectral analysis is further conducted to identify the frequencies at which the flame oscillations occur, which is aimed at guiding an eventual redesign of this bluff body. It is shown that coal injection is the major contributor to the flame oscillations, as hypothesized. A non-uniform coal distribution in the burner region is found, which, in turn, creates a non-steady coal feed and ultimately results in the flame oscillations. It is subsequently demonstrated that an increase in the coal carrier (CO2) concentration provides a better feeding of coal (continuous coal injection into the burner region), ultimately resulting in a more symmetric shape of the flame front. iii ACKNOWLEDGEMENTS I would like to thank everyone who has contributed, directly or indirectly, to my activities at West Virginia University, in general, and to completing this thesis, in particular. Specifically, my heart felt gratitude goes to Dr. Akkerman, my research advisor, who has entrusted the responsibility to work on a research field as interesting as this one. Furthermore, my heart felt gratitude goes to Ozioma Ozor, who has remained a permanent source of encouragement...

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Numerical Modelling of Oxy-Fuel Combustion in a Full-Scale Tangentially-Fired Pulverised Coal Boiler

Cited by 26 publications

References 5 publications

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NO x tangentially fired pulverised-coal boiler

Numerical investigation of the nonlinear flow characteristics in an ultra-supercritical utility boiler furnace

Computational Design of Staged Pressurized Oxy-Coal Combustion

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