Development of an Airtight Oscillating Fluidized Bed

Deguchi Seiichi, Deguchi Masayuki, Nishimura Akira, Fujima Yukihisa

doi:10.1252/kakoronbunshu.29.493

An airtight oscillating fluidized bed, which can fluidize a particle bed in an airtight vessel without supplying a fluidization gas from outside, was proposed. This system is composed of an airtight vessel and a gas duct with a valve connecting upper and lower spaces of the vessel divided by a particle stopper and a distributor plate. It was considered that fluidization could be formed by rectifying the gas flow induced by the enforced oscillation of the airtight vessel and induced particle bed inertia with the help of the gas duct and valve. In this development study, the gas duct contained a valve comprising a steel ball, of which the length of vertical movement was restricted, and its pedestal was firstly prepared as a trial. Then, theoretical simulation was performed based on experimentally obtained pressure drop through the gas duct, demonstrating the possibility of fluidization in this supposed system. Fluidization was verified in conformity with the assumed fluidization mechanism in the trial model of the oscillating fluidized bed with this gas duct. As the oscillatiing frequency increased, the fluidization state changed from static bed to incipient fluidization, bubbling fluidization and bubbling fluidization with surface wave. Finally the structure of a gas rectifier to be placed in the gas duct for efficient operation of this system was presented.

Development of an Airtight Oscillating Fluidized Bed

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