L-valve 之壓力擾動訊號分析
Analysis of Pressure Fluctuation Signals of an L-valve
Date Issued
2004
Date
2004
Author(s)
Chang, Yi-Luan
DOI
zh-TW
Abstract
The experimental apparatus consist of L-valve and downcomer made by the transparent Plexiglas columns, 80 mm i.d. The solid particles used were sand with mean particle size 193 μm. The influence of the riser velocity, aeration tap location, aeration direction and aeration depth was 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 increased with lower aeration tap location and higher riser velocity. The standard deviation increased sharp in the formation of large gas bubbles in the downcomer. The solid flow rate of aeration downflow was slightly less than that of aeration horizontal. But the standard deviation of aeration downflow was much less than that of aeration horizontal. The solid flow rate decreased and gas entry to the horizontal section of L-valve easily and rapidly by increasing aeration depth. So the standard deviation of L-valve in aerating in centerline of downcomer was higher than that in standard operation. The pressure drop of downcomer reach its maximum value in increasing aeration. The bubbles hindered the flow of solid through the downcomer and decreased the solid flow through the L-valve.
Subjects
L-閥
固體流量
壓力擾動標準偏差
solid flow rate
L-valve
standard deviation
Type
thesis
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