In order to achieve a high solid circulation rate in a spouted bed with three draft-tubes without generating slugging fluidization but with uniform circulation in each draft-tube, the relationship between the opening ratio of perforation plate, the air velocity in the colum,
U, and the space between draft-tube and perforation plate,
s, was studied.
When the opening of perforation plate was designed for the air velocity in the outside of the draft tube to be about one-fifth of the terminal velocity of a particles used, the solid circulation rate,
W, under non-slugging fluidization increased linearly with
U at a rate increasing with
s. However,
U in such a steady circulation, had an upper limit, decreasing with increase in
s. Thus, the maximum of
W at the upper limit of
U reached about 3kg/s at 0.53-0.8 of
s.
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