Abstract
Experiments were carried out on heat transfer and fluidization characteristics of a very shallow fluidized bed at high-temperatures. Argon, helium, and air were used for working gases, and zirconia beads and silicon carbide particles were used for solid particles. In the experiment of a medium-temperature range (bed temperature Tb 680K), the fluidization deteriorated; then, the heat transfer coefficient decreased very rapidly; and finally, fluidization stopped completely. In some cases, the fluidization recovered again when the gas temperature was decreased. This phenomenon may be attributed to the impurities coming from insulation material. It should be noted that the impurity content in working gas, even though a small fraction, plays a very detrimental role in the fluidization and heat transfer characteristics of a shallow fluidized bed operated at a high temperature.
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