A parametric study of radiative heat transfer in pulverised coal furnaces

The P-1 approximation and the Monte Carlo method are applied in cylindrical coal-fired furnaces. The absorption and scattering efficiencies and the phase function of coal, char and fly-ash particles are obtained from Lorenz-Mie theory and wavelength dependent optical properties based on measurements available in the literature. The influence of each kind of particle on the radiative heat transfer is investigated. Comparisons between the P-1 and the Monte Carlo methods are performed for various particle size distributions and mass concentrations. Isotropic and neglecting of scattering are evaluated against anisotropic scattering as potential simplifications in engineering applications.

[1]  M. Pinar Mengüç,et al.  Thermal Radiation Heat Transfer , 2020 .

[2]  M. Pinar Mengüç,et al.  Radiation heat transfer in combustion systems , 1987 .

[3]  F. R. Steward,et al.  The calculation of radiative heat flux in a cylindrical furnace using the Monte Carlo Method , 1971 .

[4]  Z. Kam,et al.  Absorption and Scattering of Light by Small Particles , 1998 .

[5]  M. Mitchner,et al.  Flyash radiative properties and effects on radiative heat transfer in coal-fired systems , 1989 .

[6]  Terry Wall,et al.  Radiative scatter by fly ash in pulverized-coal-fired furnaces: application of the Monte Carlo method to anisotropic scatter , 1983 .

[7]  G. Froment,et al.  An improved zone method using monte carlo techniques for the simulation of radiation in industrial furnaces , 1980 .

[8]  Effects of anisotropic scattering on radiative heat transfer using the P1-approximation , 1992 .

[9]  J. G. Marakis,et al.  Application of narrow and wide band models for radiative transfer in planar media , 2001 .

[10]  M. Pinar Mengüç,et al.  On ‘‘Radiative transfer in three-dimensional rectangular enclosures containing inhomogeneous,anisotropically scattering media’’ , 1985 .

[11]  G Gouesbet,et al.  Single scattering characteristics of volume elements in coal clouds. , 1983, Applied optics.

[12]  Raymond Viskanta,et al.  Heat transfer in steam boiler furnaces , 1988 .

[13]  M. Pinar Mengüç,et al.  Radiative transfer in axisymmetric, finite cylindrical enclosures , 1984 .

[14]  C. Murty.  Evaluation of radiation reception factors in a rotary kiln using a modified Monte-Carlo scheme , 1993 .

[15]  J. Joseph,et al.  The delta-Eddington approximation for radiative flux transfer , 1976 .

[16]  Pedro J. Coelho,et al.  Modelling of radiative heat transfer in enclosures with obstacles , 1998 .

[17]  The spectral emittance of pulverized coal and char , 1988 .

[18]  M. Q. Brewster,et al.  The Optical Constants of Coal, Char, and Limestone , 1984 .

[19]  M. Brewster.  Thermal Radiative Transfer and Properties , 1992 .

[20]  R. Ahluwalia,et al.  Radiation properties of coal combustion products , 1993 .

[21]  Jim Swithenbank,et al.  The boundary condition of the PN-approximation used to solve the radiative transfer equation , 1992 .

[22]  S. Boothroyd,et al.  Light scattering by fly ash and the applicability of Mie theory , 1987 .

[23]  J. Howell.  The Monte Carlo Method in Radiative Heat Transfer , 1998 .

[24]  J. R. Howell,et al.  Two-Dimensional Radiation in Absorbing-Emitting Media Using the P-N Approximation , 1983 .

[25]  A. Kerstein,et al.  Influence of ash on particle size distribution evolution during coal combustion , 1988 .