Heat Transfer from High Temperature Gases in a Very Shallow Fluidized Bed

Shigenao Maruyama, Toshio Aihara, Keiji Tanaka, Jyun'ichi Yamaguchi, Toshiyuki Shimoyama, Tsutomu Itoh

Research output: Contribution to journalArticle

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<680 K), heat transfer characteristics with various particle materials and gases were well correlated with the dimensionless variables calculated with the thermophysical properties at the temperature of gas jets from a multislit distributor. These dimensionless data showed good agreement with Andeen and Glicksman's empirical formula. As the operating temperature was increased (Tb>680 K), 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.

Original languageEnglish
Pages (from-to)2094-2098
Number of pages5
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume57
Issue number538
DOIs
Publication statusPublished - 1991 Jan 1

Keywords

  • Fluidized Bed
  • Heat Exchanger
  • High Temperature
  • Thermophysical Property

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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