Determination of radiative properties of pulverized coal particles from experiments
نویسندگان
چکیده
A detailed experimental-theoretical procedure is introduced to determine the effective radiative properties of pulverized coal particles. A CO, laser nephelometer system was used to measure the scattered intensity distributions around a downflow of pulverized coal particles. A semi-analytical inverse radiation analysis was used to determine the ‘effective’ scattering phase function of particles without altering their morphology. The results showed that the phase function of coal particles was highly forward-scattering and less sensitive to size variations then predicted from the Lorenz-Mie theory for homogeneous spheres. They displayed more side scattering than predicted for spheres of the same size range, indicating irregular shapes and fragmentation of particles. An effective complex index of refraction ml = 1.8 -0.2i is suggested for determination ofcoal radiative properties from the Lorenz-Mie theory using an ‘equivalent sphere’model.
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