ESTIMATION OF SURFACE-TEMPERATURE DISTRIBUTIONS DURING HEATING OF PARTICLES IN FLUIDIZED-BED

Unsteady heat transfer with internal heat generation takes place durin g the heating of solid particles in a fluidized bed combustor before t he initiation of shrinkages due to burning, i.e., during the period be fore the inside temperature in the solid particle reaches the medium t emperature. The analysis of heat transfer occurring in such particles is essential for accurate predictions of optimum heating requirements, leading to energy savings Such analysis requires an accurate measurem ent of the surface temperatures of these particles, which is very diff icult to achieve in practice. Therefore an analytical model determinin g surface temperature distributions using either center temperature me asurements or other available heat transfer parameters, such as Blot a nd Fourier numbers is desirable. Such an analytical technique is prese nted in this article. The present approach is illustrated by an exampl e using two different experimental temperature data sets. Obtained cen ter and surface temperature distributions are plotted for comparison.