Solid circulation and gas bypassing in an internally circulating fluidized bed with an orifice-type draft Tube |
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Authors: | Hong-Sik Ahn Woon-Jae Lee Sang-Done KimDg Byung-Ho Song |
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Affiliation: | (1) Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 305-701 Taejon, Korea;(2) Department of Chemical Engineering, Kunsan National University, Kunsan, Korea |
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Abstract: | The effects of orifice diameter in the draft tube, particle size, gas velocities and bed height on the circulation rate of
solids and gas bypassing between the draft tube and annulus have been determined in an internally circulating fluidized bed
(i.d., 0.3 m ; height, 2.5 m) with an orifice-type draft tube. A conical shape gas separator has been employed above the draft
tube to facilitate the separation of gases from the two beds. The circulation rate of solids and the quantity of gas bypass
from the annulus to draft tube show their minimums when the static bed height is around the bottom of the separator. The circulation
rate of solids increases with an increase in orifice diameter in the draft tube. At fixed aeration to the annulus, gas bypassing
from the draft tube to annulus sections decreases, whereas reverse gas bypassing from the annulus to the draft tube increases
with increasing the inlet gas velocity to the draft tube. The obtained solids circulation rate has been correlated by a relationship
developed for the cocurrent flow of gas and solid through the orifice. |
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Keywords: | Circulating Fluidized Bed Draft Tube Orifice Gas Bypass Solids Circulation Rate |
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