L-valve之壓力擾動分析
Date Issued
2005
Date
2005
Author(s)
Young, Chih-Ching
DOI
zh-TW
Abstract
The experimental apparatus consist of L-valve and downcomer, which is made by the transparent Plexiglas columns, 80 mm i.d. The B group sand particles with mean particle size 193.5µm was used in the experiment. The D group sand particles with mean particle size 936.5 µm was used in the experiment. The density of B and D group solid were both 2635kg/m3. The influence of the riser velocity, aeration tap location, aeration direction and components were determined by the measurement of solid flow rate and pressure fluctuations at various pressure probes. The results show that the solid flow rate of L-valve in different aeration direction had differences in lower aeration tap location only. The pressure of the horizontal section of L-valve was constant in high aeration. At the time, it had reached the largest pressure (12500 Pa) that the horizontal section of L-valve could support, and the solid flow rate would not increase any more. By mixing different proportion of B group and D group solid, we can discover that if we increase the proportion of B group for using D group solid, we could decrease the threshold aeration of L-valve, and the L-valve could be operated in lower aeration. Because of the channel effect, there would have the difficulty to occur large bubbles and slugging in the downcomer if we increase D group solid for using B group solid. But the solid flow rate will decrease because of increasing D group solid.
Subjects
循環流體化床
L-valve
Type
thesis
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