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題 名 | Turbulent Flow in Mechanical Stirred Vessels with Multiple Impeller (Ⅲ)--Bubble Motion in Plant Scale Multiple Impeller Stirred Tanks=機械式多段攪拌翼攪拌槽中之紊流流動(3)--氣泡在大型多段攪拌翼攪拌槽之運動 |
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作 者 | 呂維明; 李振銘; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 27:6 1996.11[民85.11] |
頁 次 | 頁437-445 |
分類號 | 460.023 |
關鍵詞 | 多段攪拌翼攪拌槽; 紊流; 氣泡; Bubble motion; Power consumption; Gas hold up; |
語 文 | 英文(English) |
中文摘要 | 為了要確認在實驗室規格大小的三段攪拌翼攪拌槽中所觀測到之功率消耗不均勻現象是否亦存在於大型三段攪拌翼攪拌槽(槽徑5.6m、槽高13m、體積321m3),本研究利用計算所得之流場來計算變形氣泡在攪拌槽中之運動。 在轉速80rpm、通氣量0.156uum的操作條件下計算結果發現進入中上段攪拌翼氣體量與原通氣量之比值在小型攪拌槽實驗結果(轉速250rpm、通氣量0.342uum)相近。約為25~40%。而計功率消耗比值得出在大槽中,中上段攪拌翼之功率消耗比值為2.03,上下段攪拌翼之比值為1.82,顯示各段攪拌翼功率消耗不均勻現象依然存在於大型攪拌槽,此現象在設計大型攪拌槽時是必須要考慮的。 |
英文摘要 | To examine the behavior of bubbles in plant scale multiple impeller stirred vessels, the motion of bubbles is simulated by coupling the calculated flow field. The results shoed that the volume fraction of gas passing through the middle and the upper impellers were 30-40% of the original gas fed to the system. This result is in good agreement with the previous bench scale data. This model was extended to investigate the uniformity of power consumption in the plant scale agitated vessel with triple impellers. The ratio of the power consumptions of the middle to the lower impellers was 2.03, and that of the upper to the lower impellers was 1.82. This result implied that non-uniform power consumption as seen in a bench scale vessel also exists in a plant scale vessel, and thus must be taken into consideration in the design of large scale stirred vessels. |
本系統中英文摘要資訊取自各篇刊載內容。