Temperature measurements of Beulah lignite char in a novel laminar-flow reactor

Young, Bill; McCollor, Donald P.; Weber, Bárbara; Jones, Michael L.

doi:10.1016/0016-2361(88)90010-5

Cited by 27 publications

(20 citation statements)

References 2 publications

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Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Some of these works also report on simultaneous size measurement of individual fuel particles. [6,[9][10][11][12]14] Two-color pyrometry has been the most common method for the measurement of the temperature of individual particles in flow reactors. [1][2][3][4][5][6][7][8][9][10][12][13][14][15] The major advantage of this method is its independence not only of the size but also of the emissivity of the particle.…”

Section: Introductionmentioning

confidence: 99%

“…[6,[9][10][11][12]14] Two-color pyrometry has been the most common method for the measurement of the temperature of individual particles in flow reactors. [1][2][3][4][5][6][7][8][9][10][12][13][14][15] The major advantage of this method is its independence not only of the size but also of the emissivity of the particle. However, the true temperature is obtained only for gray bodies, i.e., particles having equal emissivity at the two wavelength bands of the pyrometric measurement.…”

Section: Introductionmentioning

confidence: 99%

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Pyrometric temperature and size measurements of chalcopyrite particles during flash oxidation in a laminar flow reactor

Laurila

Hernberg

Oikari

et al. 2005

Metall Mater Trans B

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A fast two-color pyrometer has been constructed and applied to simultaneous temperature and size measurements of individual chalcopyrite particles (CuFeS 2 ) during flash oxidation in a laminar flow reactor. The influence of different oxygen concentrations (0, 10, 20, 50, and 75 vol pct), gas temperatures (1073 and 1273 K), particle size fractions (53 to 74 m and 74 to 150 m), and reaction times (up to 0.17 seconds) on chalcopyrite particle temperature and size distributions was studied. The particle reaction rates were characterized by the sulfur mass in the solid reaction product. Particle temperatures ranged from the ambient gas temperature up to 2700 K. A strong correlation between the oxygen concentration and the median particle temperature was observed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pyrometric temperature and size measurements of chalcopyrite particles during flash oxidation in a laminar flow reactor

Laurila

Hernberg

Oikari

et al. 2005

Metall Mater Trans B

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“…Because the volume and surface area of a sphere are readily determined from a single characteristic length, the dimension supplied from Mie scattering theory (e.g., Penner et al, 19841, an imaging technique using apertures (Tichenor et al, 1984;Wang and Tichenor, 1981;Waters et al, 1988), or photographs and shadowgraphs (Young et al, 1988;McLean et al, 1981) fits neatly with and, indeed, is presupposed, by the sphere assumption. It is, however, generally recognized that such an assumption has limited applicability and is not an accurate description of general particle shape.…”

Section: Introductionmentioning

confidence: 99%

Morphology Descriptors of Irregularly Shaped Particles from Two-Dimensional Images

Daves

Buckius

Peters

et al. 1993

Aerosol Science and Technology

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Two-dimensional particle images provide significantly more information about particle morphology than does the measurement of a single length scale. However, approximations are still required to estimate three-dimensional particle parameters such as external surface area and volume from a two-dimensional image. Two techniques to predict surface area and volume from a two-dimensional image are examined by using images of objects of known surface area and volume. The orthographic intersection method intersects the two-dimensional images from all possible orthogonal axes. The resulting three-dimensional objects are averaged to obtain the final particle shape descriptors. The discrete revolution method first determines the major centroidal axis of the image and then rotates the silhouette about this axis. Because the silhouette is not symmetrical with respect to the major axis, the silhouette is divided into thin strips of area perpendicular to the major axis. Each of these strips is then rotated about its own centroidal axis (parallel to the major axis). Comparisons of the results of each method for specified particles provide estimates of the accuracy of each approach. The orthographic intersection and discrete revolution methods provide superior estimates of the surface area, volume, and surface area/volume ratio as compared with approaches using single length scale equivalent spheres. The method that provided the most accurate results was the discrete revolution technique.

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“…In our previous work, simultaneous estimation of the temperature distribution and radiative properties in 1-D and 2-D rectangular systems was studied [14][15][16]. In these works, a kind of temperature image obtained by the two-color method [17] serves as a necessary supplement to the boundary intensity image in the reconstruction. In [14], the temperature distribution and scattering albedo profile in a 1-D system were reconstructed simultaneously using the conjugate gradient method.…”

Section: Introductionmentioning

confidence: 99%

Decoupled Reconstruction Method for Simultaneous Estimation of Temperatures and Radiative Properties in a One-Dimensional, Gray, Participating Medium

Lou

Zhou

2007

Numerical Heat Transfer, Part B: Fundamentals

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In the decoupled reconstruction method, using an improved Tikhonov regularization method, the temperature distribution in a participating medium is reconstructed from the boundary temperature image, and the radiative properties (absorption and scattering coefficients) are updated from the measured radiative intensity image. These two steps are taken alternately until convergence is reached. The distributions of temperature and radiative properties for two one-dimensional cases are reconstructed by the method from the boundary temperature and intensity images disturbed by measuremental errors with standard deviations up to 0.05, and the method shows good accuracy and robustness.

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Temperature measurements of Beulah lignite char in a novel laminar-flow reactor

Cited by 27 publications

References 2 publications

Pyrometric temperature and size measurements of chalcopyrite particles during flash oxidation in a laminar flow reactor

Pyrometric temperature and size measurements of chalcopyrite particles during flash oxidation in a laminar flow reactor

Morphology Descriptors of Irregularly Shaped Particles from Two-Dimensional Images

Decoupled Reconstruction Method for Simultaneous Estimation of Temperatures and Radiative Properties in a One-Dimensional, Gray, Participating Medium

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