A comparative evaluation of gray and non-gray radiation modeling strategies in oxy-coal combustion simulations

Nakod, Pravin; Krishnamoorthy, Gautham; Sami, Muhammad; Orsino, Stefano

doi:10.1016/j.applthermaleng.2013.01.049

Cited by 51 publications

(16 citation statements)

References 22 publications

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“…However, their oxy-fuel combustion cases are different from others. Nakod et al [15] demonstrated simulations of oxyfuel combustion on a 300 MW front-wall-fired boiler employing gray [16,17] and non-gray [18] radiative models, and obtained a 10% variation in incident radiative fluxes of the two models. Their study focused on the combustion mechanisms or gas radiative models, but did not carry out detailed investigation on the combustion and heat transfer properties.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on oxy-combustion characteristics of a 200MWe tangentially fired boiler

Guo

Liu

Wang

et al. 2015

Fuel

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Section: Introductionmentioning

confidence: 99%

Numerical investigation on oxy-combustion characteristics of a 200MWe tangentially fired boiler

Guo

Liu

Wang

et al. 2015

Fuel

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“…According to them, incident wall heat fluxes show higher dependency on wall temperature than recycle ratio. Nakod et al 28 performed CFD simulations using both gray and non-gray radiation modeling approach in full scale and lab scale furnaces. They performed combustion in oxy-fuel conditions (both wet and dry flue gas recycling) and conventional air-fired condition.…”

Section: Heat Transfer Under Oxy-fuel Combustionmentioning

confidence: 99%

A complete review based on various aspects of pulverized coal combustion

Yadav

Mondal

2019

Int J Energy Res

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Summary Coal is the most abundant energy source, and around 40% of the world's electricity is produced by coal combustion. The emission generated through it put a constraint on power production by coal combustion. There is a need to reduce the emissions generated through it to utilize the enormous energy of coal for power production. Detailed understanding of various aspects of coal combustion is required to reduce the emissions from coal‐fired furnaces. The aim of present paper is to review various aspects of pulverized coal combustion such as oxy‐fuel combustion, co‐combustion of coal and biomass, emissions from pulverized coal furnaces, ash formation and deposition, and carbon capture and sequestration (CCS) technologies to outline the progress made in these aspects. Both experimental and numerical aspects are included in this review. This review also discusses the thermodynamic aspects of the combustion process. Furthermore, the effect of various submodels such as devolatilization models, char combustion models, radiation models, and turbulent models on the process of pulverized coal combustion has been investigated in this paper.

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“…The second issue of the relative importance of gas and dispersed phase radiative properties will largely be determined by the reactor configurations and the flow conditions within the reactor. For instance, through coal combustion simulations, Krishnamoorthy et al [2] showed that the fidelity of the gas-phase radiative property models had little impact on the radiation distributions in a lab-scale reactor whereas differences between gray and nongray model predictions were observed in a full-scale boiler [46]. Similarly, through steam-gasification studies on directly irradiated reactor, von Zedtwitz et al [3] determined that the radiation absorption by particles was three orders of magnitude higher than that absorbed by the gas-phase.…”

Section: Radiation Modelingmentioning

confidence: 99%

A Radiative Transfer Modeling Methodology in Gas-Liquid Multiphase Flow Simulations

Krishnamoorthy

Klosterman

Shallbetter

2014

Journal of Engineering

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A methodology for performing radiative transfer calculations in computational fluid dynamic simulations of gas-liquid multiphase flows is presented. By considering an externally irradiated bubble column photoreactor as our model system, the bubble scattering coefficients were determined through add-on functions by employing as inputs the bubble volume fractions, number densities, and the fractional contribution of each bubble size to the bubble volume from four different multiphase modeling options. The scattering coefficient profiles resulting from the models were significantly different from one another and aligned closely with their predicted gas-phase volume fraction distributions. The impacts of the multiphase modeling option, initial bubble diameter, and gas flow rates on the radiation distribution patterns within the reactor were also examined. An increase in air inlet velocities resulted in an increase in the fraction of larger sized bubbles and their contribution to the scattering coefficient. However, the initial bubble sizes were found to have the strongest impact on the radiation field.

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A comparative evaluation of gray and non-gray radiation modeling strategies in oxy-coal combustion simulations

Cited by 51 publications

References 22 publications

Numerical investigation on oxy-combustion characteristics of a 200MWe tangentially fired boiler

Numerical investigation on oxy-combustion characteristics of a 200MWe tangentially fired boiler

A complete review based on various aspects of pulverized coal combustion

A Radiative Transfer Modeling Methodology in Gas-Liquid Multiphase Flow Simulations

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