呂理平Leu, L.P.L.P.Leu2006-07-252018-06-282006-07-252018-06-282006-01-18http://ntur.lib.ntu.edu.tw//handle/246246/9420本實驗裝置採用內徑為 80mm 的壓克力管所製成之下降管和 L-閥。實驗中以量測 L-閥中的固體流量及壓力擾動訊號，探討不同上升床流速、通氣位置、通氣方向和通氣深度對 L-閥的固體流量、壓力差和壓力擾動標準偏差所造成之影響。 結果顯示，固體流量隨通氣位置的降低而增加。當通氣量增加，使下降管中產生大型氣泡時，壓力擾動之標準偏差有急劇增加的現象。由不同通氣方向來看，通氣方向向下時的固體流量雖略小於水平方向通氣，但可使下降管中的壓力擾動明顯減少，即可得到較穩定的操作。以不同的通氣方向，在本實驗之最低通氣位置操作 L-valve 時，比較實驗結果可發現，當下降管底部和 L- valve 水平段所量測到之壓力值幾乎不再增加時，可推測下降管所能產生的壓力差已達到最大值，即已達到其操作上限值。The experimental apparatus consist of the downcomer and L-valve made by the transparent Plexiglas column, 80mm i.d. The influence of the riser velocity, position of aeration tap, aeration direction and aeration depth was determined by the measurement of solid flow rate, pressure drop and pressure fluctuations at various pressure probe position. The results show that the solid flow rate of L-valve increased with lower position of aeration taps. The standard deviation of pressure signals increased sharply with the formation of large gas bubbles in the downcomer. The solid flow rate of downflow of inlet gas was slightly less than that of horizontal flow of inlet gas. But the standard deviation of pressure signals of downflow of inlet gas decreased significantly, causing more stable operation. From comparing the results of different aeration directions by aerating at the lowest position of aeration tap, when the pressure measured in lower part of the downcomer and the horizontal section of L-valve was no more increased, that could suppose that the pressure drop of the downcomer was its maximum value.application/pdf56426 bytesapplication/pdfzh-TW國立臺灣大學化學工程學系暨研究所L-閥壓力擾動標準偏差固體流量L-valvepressure fluctuationssolid flow ratereporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/9420/1/932214E002024.pdf