Analysis of Pressure Fluctuation Signals of an L-valve
碩士 === 國立臺灣大學 === 化學工程學研究所 === 92 === 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...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2004
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| Online Access: | http://ndltd.ncl.edu.tw/handle/29377868770206590030 |
| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 92 === 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.
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